Phylogenetic analysis and diversity of novel endophytic fungi isolated from medicinal plant Sceletium tortuosum
Publication date: October 2018 Source:Phytochemistry Letters, Volume 27 Author(s): Madira Coutlyne Manganyi, Thierry Regnier, Ajay Kumar, Carlos Cornelius Bezuidenhout, Collins Njie Ateba Throughout history, mankind has used plants as their primary source of sustainability, in agricultural commodities, clothing, fragrances, fertilizers, flavours, and providing shelter. There is a strong symbiotic relationship between the plant and its endophytes. Endophytes are harboured within the living plant tissues without causing neither diseases nor symptoms. They produce bioactive compounds that protect the host plants against atta...
Source: Phytochemistry Letters - June 21, 2018 Category: Chemistry Source Type: research

Nematicidal compounds of Peperomia japonica
Publication date: October 2018 Source:Phytochemistry Letters, Volume 27 Author(s): Kazumi Nagashima, Yoshi Yamano, Sachiko Sugimoto, Kenji Ishiwata, Hirotaka Kanuka, Hideaki Otsuka, Katsuyoshi Matsunami On antiparasitic screening, we found that extracts of Peperomia japonica have nematicidal activity. Bioassay-guided fractionation of the methanolic extract resulted in the isolation of one new polyketide (1), two new seco-lignans (2, 3), and two known polyketides (4, 5). The structures of these compounds were established by extensive one- and two-dimensional nuclear magnetic resonance spectroscopy and high-resolution elect...
Source: Phytochemistry Letters - June 21, 2018 Category: Chemistry Source Type: research

Three new constituents from the aerial parts of Tetrastigma hemsleyanum
Publication date: October 2018 Source:Phytochemistry Letters, Volume 27 Author(s): Cai Yi Wang, Ji Sun Lee, Xiang Dong Su, Hong Xu Li, Sang Kook Lee, Heng-Shan Wang, Young Ho Kim, Seo Young Yang Three new compounds, 1-O-trans-p-hydroxycinnamoyl-2′-O-trans-caffeoyl gentiobiose (1), 2S-hydroxy-4-(4-hydroxyphenethoxy)-4-oxobutanoic acid (2), and (3R,4S,5R)-3,4-dihydroxy-5-((R)-1-hydroxyeicosyl) dihydrofuran-2(3 H)-one (3), were isolated from the ethyl acetate fraction of the 90% EtOH extract of Tetrastigma hemsleyanum aerial parts. Their structures were elucidated using ultraviolet, infrared, one- and two-dimensional...
Source: Phytochemistry Letters - June 20, 2018 Category: Chemistry Source Type: research

New secondary metabolites produced by the phytopathogenic fungus Wilsonomyces carpophilus
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Abolfazl Narmani, Rémy Bertrand Teponno, Mahdi Arzanlou, Asadollah Babai-Ahari, Marc Stadler Two new metabolites possessing the unusual 1-oxa-7-azaspiro[4.4]non-2- ene-4,6-dione core (2, 3) along with the recently described pseurotin A3 (1) were isolated from the pathogenic fungus Wilsonomyces carpophilus (previously named Stigmina carpophila). The producer organism was obtained from Prunus armeniaca collected in Iran and was identified by morphological and molecular phylogenetic methods. The structures of the isolated compounds were ...
Source: Phytochemistry Letters - June 19, 2018 Category: Chemistry Source Type: research

Meyeniihydantoins A –C, three novel hydantoin derivatives from the roots of Lepidium meyenii Walp.
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Hui-Chun Geng, Dong-Shun Yang, Xing-Lian Chen, Lu-Xiang Wang, Min Zhou, Wen-Quan Mei A new natural product meyeniihydantoin A (1), and two new hydantoin derivatives, named meyeniihydantoins B–C (2–3) were isolated from the roots of Lepidium meyenii. Their structures were characterized by means of extensive spectroscopic analyses. The isolated meyeniihydantoins were evaluated for their cytotoxicities on NB4, A549, SHSY5Y, PC3 and MCF7 human cancer cell lines. Graphical abstract (Source: Phytochemistry Letters)
Source: Phytochemistry Letters - June 19, 2018 Category: Chemistry Source Type: research

A new coumaronochromone and a new alkanoyl-dihydrofuranoflavone glycoside from Eriosema robustum (Fabaceae)
Publication date: October 2018 Source:Phytochemistry Letters, Volume 27 Author(s): Maurice Ducret Awouafack, Chin Piow Wong, Pierre Tane, Hiroyuki Morita A new coumaronochromone, eriocoumaronochromone (1), and a new alkanoyl-dihydrofuranoflavone glycoside, robusflavone C (2), as well as seven known compounds, 6-prenylpinocembrin (3), desmoxyphyllin A (4), prutin (5), genistein (6), vitexin (7), kaempferol (8), and p-hydroxy benzoic acid (9), were obtained after phytochemical re-investigation of the EtOAc-soluble portion from the EtOH extract of the twigs of Eriosema robustum. The structures of the new compounds were eluci...
Source: Phytochemistry Letters - June 19, 2018 Category: Chemistry Source Type: research

Welwitschiilactone A, B and C, three new 30-norfriedelane triterpenes from the roots of Caloncoba welwitschii (Oliv.) Gilg (Achariaceae)
Publication date: October 2018 Source:Phytochemistry Letters, Volume 27 Author(s): Chimène Victoire Tchamadeu Keugwa, Jules Lobe Songue, Alain Tadjong Tcho, Alain François Kamdem Waffo, Jean Duplex Wansi, Jean Claude Ndom Three new 30-norfriedelane triterpenoids named, 3β,21β-dihydroxy-27-oxo-30-nor-(D:A)-friedo-olean-20(29)-en-27,19α-lactone (welwitschiilactone A) (1), 21β-hydroxy-3,27-dioxo-30-nor-(D:A)-friedo-olean-20(29)-en-27,19α-lactone (welwitschiilactone B) (2) and 2β,21β-dihydroxy-27-oxo-30-nor-(D:A)-friedo-olean-20(29)-en-27,19α-lactone (welwitschiilactone...
Source: Phytochemistry Letters - June 19, 2018 Category: Chemistry Source Type: research

Isolation and structure determination of new saponins from Pulsatilla cernua based on an NMR-guided method and their anti-proliferative activities
In this study, all thirty-six compounds were investigated for the anti-proliferative activities against five human cancer cell lines (A549, MDA-MB-231, SK-Hep-1, SNU638, and HCT116). Among them, compound 2 exhibited moderate cytotoxicity to the MDA-MB-231 and SK-Hep-1, and the IC50 values are from 61.9 μM to 66.3 μM. By contrast, compound 25 exhibited significant cytotoxic activity against all cell lines A549 (IC50 = 3.8 μM), MDA-MB-231 (IC50 = 5.1 μM), SK-Hep-1 (IC50 = 1.8 μM), SNU638 (IC50 = 4.6 μM) and HCT116 (IC50 = 0.8 μM). Graphical abstract (Source: Phytochemistry Letters)
Source: Phytochemistry Letters - June 18, 2018 Category: Chemistry Source Type: research

Three new pentacyclic triterpenoids from twigs of Manniophyton fulvum (Euphorbiaceae)
Publication date: October 2018 Source:Phytochemistry Letters, Volume 27 Author(s): Ahri Bernie Djamen Mbeunkeu, Anatole Guy Blaise Azebaze, Michel Feussi Tala, Jean Emmanuel Mbosso Teinkela, Xavier Siwe Noundou, Rui Werner Maçedo Krause, Juliette Catherine Vardamides, Hartmut Laatsch Phytochemical investigation of the methanol extracts of the twigs of Manniophyton fulvum has led to the isolation and characterization of three new pentacyclic triterpenoids, designated as 3α,28-dihydroxyfriedelan-1-one (1), manniotaraxerol A (3) and manniotaraxerol B (4), along with fourteen known compounds, 3α-hydroxy-1-o...
Source: Phytochemistry Letters - June 18, 2018 Category: Chemistry Source Type: research

Two new phenylpropanoids from Amomum paratsao-ko S. Q. Tong et Y. M. Xia
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Ling Chai, Bai-Zhao Liang, Ming-Sheng Chen, Bu-Ming Liu, Xiao Lin Two new phenylpropanoids, trans-(decyl-2-ene)-3-(4-hydroxy-3-methoxy-phenyl)propenoate (1) and trans-10-hydroxydecyl-3-(4-hydroxyphenyl) propenoate (2) were isolated from Amomum paratsao-ko S. Q. Tong et Y. M. Xia. Their structures were elucidated by extensive spectroscopic methods including 1D and 2D NMR and MS spectra. The new compounds were both evaluated for their anti-inflammatory activities via examination of the effect on IL-6 and MCP-1 in LPS-stimulated BV2 microglial ...
Source: Phytochemistry Letters - June 17, 2018 Category: Chemistry Source Type: research

New isomalabaricane analogues from the sponge Rhabdastrella providentiae and their cytotoxic activities
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Phan Van Kiem, Duong Thi Dung, Pham Hai Yen, Nguyen Xuan Nhiem, Tran Hong Quang, Bui Huu Tai, Chau Van Minh Five new isomalabaricane analogues, named rhabdastrellins G - K (1–5), and three known compounds including jaspolide C (6), globostelletin C (7), and globostelletin D (8) were isolated from the sponge Rhabdastrella providentiae collected in the Eastern Sea of Vietnam. Their chemical structures were determined by HR-ESI-MS, NMR spectroscopy, experimental and calculated circular dichroism spectra. The isolated secondary metabolites...
Source: Phytochemistry Letters - June 17, 2018 Category: Chemistry Source Type: research

Cytotoxic alkaloids from the fruits and seeds of Alangium salviifolium (L.f.) Wangerin
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Si-Yuan Zhou, Fengkai Fan, Ji-Zheng Sun, Ziyan Guo, Wen-Ting Sun, Ling Chen, Qing-Qing Tang, Guofu Qiu, Sheng-Ping Yang, Jianqing Yu, You-Sheng Cai One new cepheline-type alkaloid 8-hydroxyl-cepheline (1) and one new natural product Δ1′,2′-deoxytubulosine (2), together with 9 known alkaloids have been isolated from the fruits and seeds of Alangium salviifolium (L.f.) Wangerin. The structures of the new alkaloids were elucidated by means of extensive spectroscopic analysis (2D NMR, HRESIMS). All alkaloids were evaluated for ...
Source: Phytochemistry Letters - June 17, 2018 Category: Chemistry Source Type: research

Oleocanthalic and Oleaceinic acids: New compounds from Extra Virgin Olive Oil (EVOO)
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Apostolis Angelis, Lemonia Antoniadi, Panagiotis Stathopoulos, Maria Halabalaki, Leandros A. Skaltsounis An ongoing phytochemical investigation of extra virgin olive oil (EVOO) secondary metabolites, led to the isolation of three secoiridoid acids. Two of them namely Oleocanthalic acid (1) and Oleaceinic acid (2) are new natural products while the third one, acid derivative of dialdehydic form of decarboxymethyl elenolic acid (3), is described for the first time in olive oil. The structure elucidation of purified compounds was based on NMR (...
Source: Phytochemistry Letters - June 16, 2018 Category: Chemistry Source Type: research

Furan carbonylhydrazones-derived elicitors that induce the resistance of rice to the brown planthopper Nilaparvata lugens
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Xia Chen, Xingrui He, Wanwan Wang, Pengyong Zhou, Yonggen Lou, Jun Wu To obtain new elicitors that could induce plant defense against pests, a series of furan carbonylhydrazones were synthesized. Phenotypic high-throughput screening of β-glucuronidase (GUS) activity was used to identify elicitors with strong activity. Integrated bioassays were conducted to acquire chemical elicitors that induce resistance in rice to the brown planthopper Nilaparvata lugens and they are not direct toxic to the pest. Our results demonstrate that these com...
Source: Phytochemistry Letters - June 15, 2018 Category: Chemistry Source Type: research

Triterpene saponins with a-glucosidase and PTP1B inhibitory activities from the leaves of Aralia elata
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Yan Zhang, Feng-Ying Han, Jie Wu, Shao-Jiang Song Two new triterpene saponins named congmuyenoside V (1) and congmuyenoside VI (2), together with eleven known ones (3-13) were isolated from the leaves of Aralia elata. Structures of compounds 1-13 were determined by comprehensive spectroscopic analyses, principally including 1D, 2D NMR and HRESIMS techniques. In addition, all compounds were evaluated for their inhibitory effects on α-glucosidase and protein tyrosine phosphatase 1B (PTP1B). Compounds 1, 7 and 9-13 exhibited stronger &alp...
Source: Phytochemistry Letters - June 15, 2018 Category: Chemistry Source Type: research

The impact of light intensity on metabolomic profile of Arabidopsis thaliana wild type and reticulata mutant by NMR spectroscopy
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Tahereh Jafari, Moona Rahikainen, Elina Puljula, Jari Sinkkonen, Saijaliisa Kangasjärvi Light acclimation involves biochemical, metabolic and developmental adjustments that allow plants to cope with a vast range of growth environments. Arabidopsis thaliana mutants with photoperiod-dependent defects in leaf development and metabolism have been instrumental in deciphering the interlinked regulatory networks in plants. The reticulata (re) mutant displays dark green veins and pale green mesophyll tissues when grown under long day conditions...
Source: Phytochemistry Letters - June 15, 2018 Category: Chemistry Source Type: research

Revisiting Costa Rican Carapichea affinis (Rubiaceae: Palicoureeae): A source of bioactive dopamine-iridoid alkaloids
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Christoph Kornpointner, Andreas Berger, Isabella Maria Fischer, Louise Popl, Christiane Groher, Karin Valant-Vetschera, Lothar Brecker, Johann Schinnerl Phytochemical investigations of methanolic extracts obtained from leaves and stem bark of Carapichea affinis (Rubiaceae: Palicoureeae), a poorly known relative of the famous vomiting root ipecac (C. ipecacuanha), led to the isolation and identification of two new and five known dopamine-iridoid alkaloids. All of them are structurally related to the famous emetic and anti-amoebic compound eme...
Source: Phytochemistry Letters - June 14, 2018 Category: Chemistry Source Type: research

New flavans and stilbenes from Cyperus conglomeratus
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Ahmed A. Zaki, Samir A. Ross, Yasser A. El-Amier, Ikhlas A. Khan The chromatographic investigation of Cyperus conglomeratus Rottb. aerial parts resulted in the isolation of three new flavan derivatives, 7,3′-dihydroxy-8,4′-dimethoxyflavan (1), 7,4′-dihydroxy-5,3′-dimethoxy-8-methylflavan (2) and 7,4′-dihydroxy-5,3′-dimethoxy-8-prenylflavan (3), and two new stilbene derivatives, 4-hydroxy-5′-methoxy-6′′,6′′-dimethylpyran[2′′,3′′: 3′, 2′]stilb...
Source: Phytochemistry Letters - June 11, 2018 Category: Chemistry Source Type: research

Two new indolic and quinolinic alkaloids and other secondary metabolites from Mostuea thomsonii (Loganiaceae)
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Eric Gustave Bobda Gompe, Blandine Marlyse Wache Ouahouo, Valerie Tedjon Sielinou, Maurice Tsaffack, Jean Fotie, Jules Clement Nguedia Assob, Hayato Ishikawa, Pierre Mkounga, Augustin Ephrem Nkengfack Phytochemical investigation of the roots, stems and leaves of Mostuea thomsonii (Loganiaceae) resulted in the isolation of two new alkaloids of indolic and quinolinic types, named Thomsonines A (1) and B (2) respectively. Eleven additional known compounds, including one alkaloid namely camptothecine 3 and ten triterpene derivatives: 2α,3&...
Source: Phytochemistry Letters - June 7, 2018 Category: Chemistry Source Type: research

Diels –Alder type adducts with potent alpha-glucosidase inhibitory activity from Morus macroura
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Yi-Fan Wang, Mei-Hua Yu, Liang-Jin Xu, Li-Xin Niu, Chun-Yue Huang, Hui Xu, Pei-Ming Yang, Xiao Hu Two new Diels–Alder type adducts, macrourins I and J (1–2), along with seven known analogues (3–9) were isolated from the stems of Morus macroura Miq. The structures of the two new compounds were elucidated by extensive analysis of spectroscopic data. Compounds 1–9 all showed highly potent in vitro α-glucosidase inhibitory activities, and the IC50 values of compounds 1 and 2 were 1.70 and 1.58 μM, respectively, a...
Source: Phytochemistry Letters - June 6, 2018 Category: Chemistry Source Type: research

New 30-ketophragmalins with anti-breast cancer activity against MDA-MB-453 cells from the Godavari mangrove, Xylocarpus moluccensis (Lam.) M. Roem
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Min Zhang, Zhi Shi, Junjun Liu, Li Shen, Jun Wu 30-Ketophragmalins are a small group of limonoids. To date, only 21 ones have been exclusively reported from the mangrove, Xylocarpus moluccensis (Lam.) M. Roem. In this paper, three new 30-ketophragmalins, named godavarins L-N (1-3), were obtained from the seeds of X. moluccensis, collected in the mangrove swamp of Godavari estuary, Andhra Pradesh, India, together with a mexicanolide, named godavarin O (4). The structures of these compounds, including absolute configurations of godavarins L-M ...
Source: Phytochemistry Letters - June 5, 2018 Category: Chemistry Source Type: research

Targeted discovery of bioactive natural products using a pharmacophoric deconvolution strategy: Proof of principle with eleganolone from Bifurcaria bifurcata R. Ross
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Flore Nardella, Laure Margueritte, Barbara Lamure, Justine Martine Pierrette Viéville, Mélanie Bourjot Most of the strategies to guide the discovery process of new bioactive natural products are time-consuming. Therefore, we developed a new strategy to accelerate this discovery process. Combining differential analysis of 2D-NMR spectra to obtain a pharmacophoric fingerprint, with HPLC-DAD-MS-SPE-NMR hyphenated technique and a bioactivity assay, this strategy led to the reliable structural identification of the activity-bearing ...
Source: Phytochemistry Letters - June 5, 2018 Category: Chemistry Source Type: research

Anti-inflammatory lignans from Melodinus suaveolens
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Lei Fang, Zhong-Ying Fang, Peng Zhou, Jie Bao, Jin-Hai Yu, Jin-Tong Song, Jie Zhou, Hua Zhang Three new lignans, melodinins A–C (1–3), together with four known analogues (4–7), were isolated from the stems of Melodinus suaveolens. Their structures including relative configurations were determined by spectroscopic methods, including 1D and 2D NMR, and HRESIMS. Their absolute configurations were unambiguously assigned by electronic circular dichroism (ECD) experiments, especially the application of ECD exciton chirality metho...
Source: Phytochemistry Letters - June 1, 2018 Category: Chemistry Source Type: research

Anti-mycobacterial haliclonadiamine alkaloids from the Okinawan marine sponge Haliclona sp. collected at Iriomote Island
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Delfly B. Abdjul, Akiho Yagi, Hiroyuki Yamazaki, Ryota Kirikoshi, Ohgi Takahashi, Michio Namikoshi, Ryuji Uchida Two new haliclonadiamine derivatives, halichondriamine C (1) and 1-epi-halichondriamine C (2), were isolated from the Okinawan marine sponge Haliclona sp. together with known haliclonadiamine (3) and papuamine (4). The structures of 1 and 2 were elucidated based on their spectroscopic data by comparisons with those for related compounds. Compounds 1 and 2 were epimers of each other at the C-1 position. Compounds 1–4 inhibite...
Source: Phytochemistry Letters - May 31, 2018 Category: Chemistry Source Type: research

Zanthoamides G-I: Three new alkamides from Zanthoxylum zanthoxyloides
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Stephanie T. Guetchueng, Lutfun Nahar, Kenneth J. Ritchie, Fyaz M.D. Ismail, Andrew R. Evans, Satyajit D. Sarker Three new alkamides, zanthoamides G-I (1-3), together with ten known compounds, araliopsine, skimmianine, N-methylplatydesminium cation, isoplatydesmine, myrtopsine, atanine, N-methylatanine, sesamin, hesperetin and hesperidin, were isolated from the fruits of Zanthoxylum zanthoxyloides. Their structures were elucidated by spectroscopic means. All isolated compounds were assessed for their cytotoxicity against A549, MCF7, PC3 and ...
Source: Phytochemistry Letters - May 28, 2018 Category: Chemistry Source Type: research

A pyrrocidine derivative produced by fungus Neonectria ramulariae In-2 isolated from a Beetle Holotrichia picea
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Yoshihito Shiono, Mariko Furukawa, Takuya Koseki, Eunsang Kwon, Andreas Hendracipta Kurniawan, Satoru Sato, Desi Harneti, Rani Maharani, Unang Supratman, Shota Uesugi, Ken-ichi Kimura A new pyrrocidine A derivative, 19-epi-pyrrocidine A (1) was isolated from the insect–derived fungus Neonectria ramulariae In-2, together with known pyrrocidine A (2). The structure of 1 was determined by extensive 1D- and 2D-NMR, and MS spectral analyses. The absolute configuration of 2 was confirmed for the first time by X-ray crystallography. Compound ...
Source: Phytochemistry Letters - May 27, 2018 Category: Chemistry Source Type: research

New anti-glycative flavonoids from Cirsium setidens with potent radical scavenging activities
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Gyeong Han Jeong, Eui Kyun Park, Tae Hoon Kim Two new methoxylated flavonoids, setidenosides A (1) and B (2), together with three known constituents, linarin (3), 5-O-E-p-coumarolyquinic acid methyl ester (4), and syringin (5), were isolated from a methanol extract of the aerial parts of Cirsium setidens Nakai (Asteraceae) through bioassay-guided fractionation using advanced glycation end products (AGEs) formation assay. The structures of the new compounds were elucidated by spectroscopic and chemical methods Among these isolated compounds, ...
Source: Phytochemistry Letters - May 27, 2018 Category: Chemistry Source Type: research

Prenylated isoflavones from the stem bark of Erythrina sacleuxii
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Japheth O. Ombito, Runner R.T. Majinda, Ishmael B. Masesane, Gomotsang Bojase, Anja Schüffler, Till Opatz Two new prenylated isoflavones, named erysacleuxin A (1) and B (2), along with eight known compounds, biochanin A (3), 5′-(3-methylbut-2-enyl)pratensein (4), 7-demethylrobustigenin (5), 3′-(3-methylbut-2-enyl)biochanin A (6) abyssinone V-4′-methyl ether (7), sigmoidin E (8), erythrinasinate (9), and burtinone (10) were isolated from the stem bark of Erythrina sacleuxii Hua (Leguminosae). The structures were determi...
Source: Phytochemistry Letters - May 26, 2018 Category: Chemistry Source Type: research

Three new 2-(2-phenylethyl)chromone derivatives from artificial holing agarwood of Aquilaria sinensis
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Tong-Dong Kuang, Hui-Qin Chen, Fan-Dong Kong, Cai-Hong Cai, Li Yang, Wen-Li Mei, Hao-Fu Dai Three new 2-(2-phenylethyl)chromone derivatives (1–3) were obtained from the artificial holing agarwood originating from Aquilaria sinensis. Their structures were unambiguously deduced by detailed spectroscopic analysis and the absolute configurations were determined by ECD calculations. Compounds 1–3 displayed acetylcholinesterase (AChE) inhibitory activity with the inhibition ratios in the range of 30%–45% at a concentration of 50...
Source: Phytochemistry Letters - May 26, 2018 Category: Chemistry Source Type: research

Four new sesquiterpenes from Atractylodes lancea
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Jian-Shuang Jiang, Kuo Xu, Zi-Ming Feng, Ya-Nan Yang, Pei-Cheng Zhang Four new sesquiterpene compounds, (5R,7R,10S)-3-O-β-d-glucopyranosylisopterocarpolone-11-O-β-d-apiofuranosyl-(1 → 6)-β-d-glucopyranoside (1), (5R,7R,10S)-14-carboxylisopterocarpolone-11-O-β-d-glucopyranoside (2), (1R,7R,10R)-1-hydroxylcarissone-11-O-β-d-glucopyranoside (3), and (1R,7R,10S)-10,11-dihydroxy-4-guaien-3-one 11-O-β-d- glucopyranoside (4), were isolated from the Atractylodes lancea by high-performance liquid chromatography....
Source: Phytochemistry Letters - May 26, 2018 Category: Chemistry Source Type: research

Dihydro- β-​agarofuran sesquiterpenoids from the seeds of Celastrus paniculatus Willd. and their α-glucosidase inhibitory activity
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Sasikumar P., Sharathna P., Prabha B., Sunil Varughese, Anil Kumar N., Sivan V.V., Sherin D.R., Suresh E., Manojkumar T.K., Radhakrishnan K.V. Three previously undescribed dihydro-β-agarofuran sesquiterpenoids (1–3) along with eight known sesquiterpenoids (4–11) were isolated from the seeds of C. paniculatus. The structures of these compounds were determined on the basis of UV, IR, HR-MS (ESI), 1D and 2D NMR data obtained, and their absolute configurations were further confirmed by single-crystal X-ray diffraction. All these...
Source: Phytochemistry Letters - May 26, 2018 Category: Chemistry Source Type: research

Quality and quantity of piperidine alkaloids in needles and bark of Scots pine (Pinus sylvestris) seedlings
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Virpi Virjamo, Riitta Julkunen-Tiitto The Northern boreal forest zone is dominated by two coniferous species that synthesize piperidine alkaloids: Scots pine (Pinus sylvestris) and Norway spruce (Picea abies). These compounds are known to have antifeedant properties. We have earlier shown that Norway spruce has a diverse alkaloid chemistry, but reports from P. sylvestris are few, and no quantitative analysis has been conducted so far. Here we have studied 2-year-old seedlings of P. sylvestris to reveal possible differences in alkaloid chemis...
Source: Phytochemistry Letters - May 22, 2018 Category: Chemistry Source Type: research

Total synthesis of Crotogossamide using an on-resin concomitant cyclization/cleavage reaction
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Christopher Bérubé, Alexandre Borgia, Gaëlle Simon, Daniel Grenier, Normand Voyer Crotogossamide, a cyclic peptide isolated from the latex of Croton gossypifolius, has been synthesized by a rapid and efficient Boc solid-phase peptide synthesis. The strategy takes advantage of the oxime resin nucleophile susceptibility and comprises the synthesis of a linear precursor followed by on-resin head-to-tail concomitant cyclization/cleavage. In addition, we report the first antimicrobial and antibiofilm investigations on Crotogoss...
Source: Phytochemistry Letters - May 22, 2018 Category: Chemistry Source Type: research

Three new diterpenes from the seeds of Caesalpinia minax Hance and their anti-inflammatory activity
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Qin Liu, Bai Bai, Juan Shen, Sheng-qing Wu, Long-ping Zhu, De-po Yang, Zhi-min Zhao Three new diterpenes, caesalmin U (1), caesalmin V (2) and caesalmin W (3), were isolated from the EtOAc extract of the seeds of Caesalpinia minax Hance. Their structures were mainly characterized on the basis of extensive spectroscopic analyses and comparison with reported data. The inhibitory activities of nitric oxide (NO) production release of RAW 264.7 cells stimulated by lipopolysaccharide (LPS) of compounds 1-3 were evaluated, and compound 1 displayed ...
Source: Phytochemistry Letters - May 20, 2018 Category: Chemistry Source Type: research

Arylated gymnemic acids from Gymnema sylvestre R.Br. as potential α-glucosidase inhibitors
Publication date: June 2018 Source:Phytochemistry Letters, Volume 25 Author(s): Naila Hassan Alkefai, Javed Ahamad, Saima Amin, Manju Sharma, Showkat R. Mir A mixture of gymnemic acids was precipitated from the water extract of leaves of Gymnema sylvestre (Retz.) R.Br. ex Sm. (Asclepiadaceae) by acidification with mineral acid. The chromatographic separation of gymnemic acids mixture afforded four new arylated gymnemic acids (1–4) along with a gymnemasaponin (5). The compounds were characterized on the basis of extensive spectral data analysis. The arylated compounds (1–4) showed dose dependent inhibition of &...
Source: Phytochemistry Letters - May 18, 2018 Category: Chemistry Source Type: research

O-Glucoside of natural cleomiscosin-A: An attenuator of pro-inflammatory cytokine production
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Ahil Sajeli Begum, S. Santhosh Kumar, Suryanarayana Gottapu, Kirti Hira The study was aimed to improve the hydrophilic property and pro-inflammatory cytokine inhibitory effect of cleomiscosin-A (CA), a naturally occurring coumarinolignan in plants. In view of this, O-, N- and S-glucosides of cleomiscosin-A was designed and docking studies were performed for TNF-α protein. All derivatives showed considerable docking scores in the range of −8.433 to −9.401 kcal/mol compared to a standard TNF-α inhibitor. The O-glucosi...
Source: Phytochemistry Letters - May 18, 2018 Category: Chemistry Source Type: research

Three novel 14-epiarborane triterpenoids from Imperata cylindrica Beauv. var. major
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Yuki Sakai, Junichi Shinozaki, Akihito Takano, Kazuo Masuda, Takahisa Nakane Three novel triterpenoids, 14-epiarbor-7-en-3β-ol (1), 14-epiarbor-7-en-3β-yl formate (2) and 14-epiarbor-7-en-3-one (3) were isolated from the rhizomes of Imperata cylindrica. Their structures were determined using spectroscopic methods including 2D NMR and using NMR shift reagents. These unique triterpenoid skeletons were isolated for the first time and the presence of these compounds suggests a novel biosynthetic route for triterpenoids. Graphical abstr...
Source: Phytochemistry Letters - May 18, 2018 Category: Chemistry Source Type: research

New indane and naphthalene derivatives from the rhizomes of Kniphofia reflexa Hutchinson ex Codd
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Denis Kehdinga Sema, Alain Meli Lannang, Simplice J.N. Tatsimo, Mujeeb-ur-Rehman, Sammer Yousuf, Denis Zoufou, Urooj Iqbal, Jean Duplex Wansi, Norbert Sewald, M. Iqbal Choudhary Two new (1-2) and eight known (3-10) secondary metabolites were isolated from the rhizomes of Kniphofia reflexa Hutchinson ex Codd. Among them, an indane derivative kniphofiarindane (1), and naphthalene derivative kniphofiarexine (2), were identified as new natural products. 1D- and 2D-NMR spectroscopic studies together with single-crystal X-ray diffraction technique...
Source: Phytochemistry Letters - May 18, 2018 Category: Chemistry Source Type: research

Neuroprotective effects of cryptotanshinone and 1,2-dihydrotanshinone I against MPTP induced mouse model of Parkinson ’s disease
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Gui-yun Cao, Xiao-hong Wang, Ke-ke Li, Ai-hong Zhao, Li Shen, Duo-nan Yu 1,2-dihydrotanshinone I (DTs1) and cryptotanshinone (CTs) are the two major compounds isolated from Salvia castanea f. tomentosa Stib., which possess diverse biological effects such as antioxidant, anticancer, anti-​atherogenic, anti-​hepatic fibrosis. However, there is no any report available on the neuroprotective effects of DTs1 and CTs against MPTP induced dopaminergic neurons damage. Therefore, in this study, we investigated the neuroprotective effects of DTs1 ...
Source: Phytochemistry Letters - May 18, 2018 Category: Chemistry Source Type: research

Biosynthetic origin of alkylated decaline-type polyketides and induction of a new metabolite by addition of benzoate in cultured mycobionts of Pyrenula sp.
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Yukiko Takenaka, Takao Tanahashi The assembly pattern of acetate units and methyl groups in the biosynthesis of a polyketide, pyrenulic acid C (1), in cultured mycobionts of a Vietnamese Pyrenula sp. was verified by administration of sodium [1-13C]-acetate, sodium [1,2-13C2]-acetate, and L-[methyl-13C]-methionine. The cultured mycobionts were induced to produce a new polyketide, pyrenulic acid I (2), by addition of sodium benzoate to malt-yeast extract medium supplemented with 5% sucrose. Its structure was determined by spectroscopic methods...
Source: Phytochemistry Letters - May 18, 2018 Category: Chemistry Source Type: research

Three new metabolites from the endophytic fungus Climacocystis montana isolated from the root bark of Paeonia ostia
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Pei-liang Zhang, Gang Wang, Jin-song Liu, Feng-qing Xu, Zhen-zhu Zhao, Wen-xiang Wang, Ju-tao Wang, Guo-kai Wang, Pei-yun Wu Two new pyridine derivatives climacomontaninates A–B (1–2), and a new sesquiterpenoid derivative climacomontanetate (3), together with twelve known compounds (4–15) were isolated from the culture extract of the fungal strain Climacocystis montana from the root bark of Paeonia ostii. The structures of these compounds were determined through spectroscopic methods such as NMR and HRMS. Moreover, we expou...
Source: Phytochemistry Letters - May 18, 2018 Category: Chemistry Source Type: research

Two new cyclopropane monoterpene epimers from Varthemia iphionoides of Jordanian origin
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Mahmoud A. Al-Qudah, Musa H. Abu Zarga, Monther A. Khanfar, Hala I. Al-Jaber, Sultan T. Abu Orabi, Konrad Seppelt Two new monoterpenes, varthemic acid I (1) and varthemic acid II (2), in addition to 12 known compounds were isolated from the aerial parts of Varthemia iphionoides (Asteraceae family) growing wild in Jordan. Structural elucidation of all isolated compounds was performed utilizing extensive spectroscopic data including UV, IR, MS, and NMR (1 & 2D) spectroscopy. The absolute stereochemistry of compound 1 was determined by ...
Source: Phytochemistry Letters - May 18, 2018 Category: Chemistry Source Type: research

Benzoxazinoid and indoxyl glycosides from Wrightia religiosa
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Poolsak Sahakitpichan, Nitirat Chimnoi, Chutima Srinroch, Somsak Ruchirawat, Tripetch Kanchanapoom A new class of secondary metabolites of the family Apocynaceae, benzoxazinoid, was reported for the first time from Wrightia religiosa. A new benzoxazinoid glycoside, (2S)-2-O-β-d-glucopyranosyl-2H-1,4-benzoxazin-3(4H)-one (2) and a new indole diglycoside, indoxyl 3-O-β-d-apiofuranosyl-(1 → 6)-β-d-glucopyranoside (4) were isolated, together with twelve known compounds, including benzoxazinoid glycosides (1, 3), simple ar...
Source: Phytochemistry Letters - May 18, 2018 Category: Chemistry Source Type: research

Flavonoids and saponins from two Bulgarian Astragalus species and their neuroprotective activity
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Aleksandar Shkondrov, Ilina Krasteva, Franz Bucar, Olaf Kunert, Magdalena Kondeva-Burdina, Iliana Ionkova Two novel compounds from A. glycyphylloides DC (1–2) and three rare flavonoids from A. spruneri Boiss. (3–5), alongside their neuroprotective activity and possible effects as human monoamine oxidase type B inhibitors were reported. The structural elucidation of the compounds was achieved by chemical, HRESIMS and NMR analyses. Their effects were investigated in vitro on isolated rat brain synaptosomes in 6-hydroxydopamine-indu...
Source: Phytochemistry Letters - May 18, 2018 Category: Chemistry Source Type: research

Unveiling the fungal biotransformation of hydralazine using 13C-precursor
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Marilia O. Almeida, Adriana A. Lopes, Patricia G. Roberto, Bianca W. Bertoni, Mônica T. Pupo The fermentation of the endophyte Fusarium oxysporum SS46 and Fusarium oxysporum ATCC MYA 4623 with epigenetic modulator hydralazine in Czapek medium led to the isolation of 3-methyl-1,2,4-triazolo[3,4-a]phthalazine (1). The mechanism of biotransformation involves reaction with acetyl-CoA and further cyclization, and was unveiled using 13C-precursor. Additionally, AFLP technique for genomic DNA and differential gene expression (cDNA) analyses w...
Source: Phytochemistry Letters - May 18, 2018 Category: Chemistry Source Type: research

Melantheraside A –E, five original triterpenes with natural chloride or oxime group from the aerial parts of Melanthera elliptica O. Hoffm.
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Cyrille Ngoufack Tagousop, David Ngnokam, Dominique Harakat, Laurence Voutquenne-Nazabadioko Five new pentacyclic triterpenoids, Melantheraside A–E (1–5) together with eleven known compounds (6-16) were isolated from the methanol extract of the aerial parts of Melanthera elliptica O. Hoffm. Their structures were established by extensive analysis of 1D- (1H, 13C), 2D- (COSY, ROESY, HSQC and HMBC) NMR data experiments in conjunction with mass spectrometry (TOFESIMS and HR-TOFESIMS) and by comparison with data reported in the litera...
Source: Phytochemistry Letters - May 18, 2018 Category: Chemistry Source Type: research

Understanding health-related properties of bushmint (Hyptis) by pharmacokinetic modelling of intestinal absorption
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Jamie Selby-Pham, Sophie N.B. Selby-Pham, Kimber Wise, Louise E. Bennett Hyptis species including H. pectinata and H. verticillata are widely used in ethnopharmacology, wherein plant-extracts are ingested to treat a range of ailments including gastro-intestinal afflictions. However, the intestinal pharmacokinetics of these extracts are poorly understood. Recently, a Phytochemical Absorption Prediction (PCAP) model was reported, allowing prediction of the time for ingested phytochemicals to reach maximal plasma concentration (Tmax) in humans ...
Source: Phytochemistry Letters - May 18, 2018 Category: Chemistry Source Type: research

Antagonistic metabolites produced by the fungus Curvularia sp. BCC52426 against Aspergillus sp. BCC51998
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Nantiya Bunbamrung, Chakapong Intaraudom, Aibrohim Dramae, Nattawut Boonyuen, Rungtiwa Chanthaket, Pranee Rachtawee, Pattama Pittayakhajonwut Four previously undescribed compounds, including (Z)-chloromonilinic acid B (1), (E)-chloromonilinic acid C (2), 4-chlorocurvularin (5), and 4-chlorocurvularinic acid (6), together with four known compounds, (E)-chloromonilinic acids A and B, pinselin, and anhydromevalonolactone, were isolated from the fungus Curvularia sp. BCC52426. The chemical structures were determined by comparing their NMR spectr...
Source: Phytochemistry Letters - May 18, 2018 Category: Chemistry Source Type: research

Identification of antioxidant constituents of the aerial part of Plantago asiatica using LC –MS/MS coupled DPPH assay
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Jong Hoon Ahn, Yang Hee Jo, Seon Beom Kim, Ayman Turk, Kyung-Eon Oh, Bang Yeon Hwang, Ki Yong Lee, Mi Kyeong Lee Screening of EtOAc soluble fraction of Plantago asiatica (Plantaginaceae) using HPLC–MS/MS coupled DPPH online assay suggested the presence of antioxidant compounds, which characterized as phenylethanoid glycosides. Twenty-nine compounds including three new compounds, plantalides A–C, a phenylethanoid (1), a phenolic compound (9) and an iridoid (10), were isolated from P. asiatica. Consistent with HPLC–MS/MS anal...
Source: Phytochemistry Letters - May 18, 2018 Category: Chemistry Source Type: research

Three new chlorophenolic glucosides from Curculigo orchioides Gaertn
Publication date: August 2018 Source:Phytochemistry Letters, Volume 26 Author(s): Zhen-Hui Wang, Xue-Yun Gong, De-Jun Zhou, Peng-Fei Xu, Mei Huang, Qing-Ling Zhang, Yue-Li Meng, Chao Niu, Yan-Ru Zhang Three new chlorophenolic glucosides, Curculigine M (1), Curculigine N (2) and Curculigine O (3) were isolated from the dried rhizomes of Curculigo orchioides Gaertn. Their structures were identified by means of spectroscopic methods such as 1D, 2D NMR and MS. These chlorophenolic glycosides were evaluated for effect on osteoblast proliferation against MC3T3-E1 cell line by using MTT assays. Compounds 1, 2 and 3 showed modera...
Source: Phytochemistry Letters - May 18, 2018 Category: Chemistry Source Type: research