New flavans and stilbenes from Cyperus conglomeratus
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(s): Ahmed A. Zaki, Samir A. Ross, Yasser A. El-Amier, Ikhlas A. KhanAbstractThe 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′]...
Source: Phytochemistry Letters - July 11, 2018 Category: Chemistry Source Type: research

Revisiting Costa Rican Carapichea affinis (Rubiaceae: Palicoureeae): A source of bioactive dopamine-iridoid alkaloids
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(s): Christoph Kornpointner, Andreas Berger, Isabella Maria Fischer, Louise Popl, Christiane Groher, Karin Valant-Vetschera, Lothar Brecker, Johann SchinnerlAbstractPhytochemical 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 compoun...
Source: Phytochemistry Letters - July 11, 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 2018Source: Phytochemistry Letters, Volume 26Author(s): Tahereh Jafari, Moona Rahikainen, Elina Puljula, Jari Sinkkonen, Saijaliisa KangasjärviAbstractLight 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 condi...
Source: Phytochemistry Letters - July 11, 2018 Category: Chemistry Source Type: research

Triterpene saponins with a-glucosidase and PTP1B inhibitory activities from the leaves of Aralia elata
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(s): Yan Zhang, Feng-Ying Han, Jie Wu, Shao-Jiang SongAbstractTwo 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...
Source: Phytochemistry Letters - July 11, 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 2018Source: Phytochemistry Letters, Volume 26Author(s): Xia Chen, Xingrui He, Wanwan Wang, Pengyong Zhou, Yonggen Lou, Jun WuAbstractTo 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 thes...
Source: Phytochemistry Letters - July 11, 2018 Category: Chemistry Source Type: research

Oleocanthalic and Oleaceinic acids: New compounds from Extra Virgin Olive Oil (EVOO)
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(s): Apostolis Angelis, Lemonia Antoniadi, Panagiotis Stathopoulos, Maria Halabalaki, Leandros A. SkaltsounisAbstractAn 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 ...
Source: Phytochemistry Letters - July 11, 2018 Category: Chemistry Source Type: research

Cytotoxic alkaloids from the fruits and seeds of Alangium salviifolium (L.f.) Wangerin
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(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 CaiAbstractOne 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...
Source: Phytochemistry Letters - July 11, 2018 Category: Chemistry Source Type: research

New isomalabaricane analogues from the sponge Rhabdastrella providentiae and their cytotoxic activities
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(s): Phan Van Kiem, Duong Thi Dung, Pham Hai Yen, Nguyen Xuan Nhiem, Tran Hong Quang, Bui Huu Tai, Chau Van MinhAbstractFive 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 metabo...
Source: Phytochemistry Letters - July 11, 2018 Category: Chemistry Source Type: research

Two new phenylpropanoids from Amomum paratsao-ko S. Q. Tong et Y. M. Xia
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(s): Ling Chai, Bai-Zhao Liang, Ming-Sheng Chen, Bu-Ming Liu, Xiao LinAbstractTwo 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 microg...
Source: Phytochemistry Letters - July 11, 2018 Category: Chemistry Source Type: research

Meyeniihydantoins A–C, three novel hydantoin derivatives from the roots of Lepidium meyenii Walp.
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(s): Hui-Chun Geng, Dong-Shun Yang, Xing-Lian Chen, Lu-Xiang Wang, Min Zhou, Wen-Quan MeiAbstractA 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 - July 11, 2018 Category: Chemistry Source Type: research

New secondary metabolites produced by the phytopathogenic fungus Wilsonomyces carpophilus
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(s): Abolfazl Narmani, Rémy Bertrand Teponno, Mahdi Arzanlou, Asadollah Babai-Ahari, Marc StadlerAbstractTwo 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 w...
Source: Phytochemistry Letters - July 11, 2018 Category: Chemistry Source Type: research

A xanthurenate and an isoindolinone from the mycelia of Hericium erinaceum
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(s): Chwan-Fwu Lin, Young-Ji Shiao, Chin-Chu Chen, Tsai-Teng Tzeng, Chien-Chih Chen, Li-Ya Lee, Wan-Ping Chen, Chien-Chang ShenAbstractEthyl 8-hydroxy-4-methoxyquinoline-2-carboxylate (1) and a new compound, erinacerin U (2), were isolated from the mycelia of Hericium erinaceum. Their structures were elucidated by spectroscopic analysis. Compound 1 was found to possess a significant inhibition on the production of NO in LPS-activated microglia.Graphical abstract (Source: Phytochemistry Letters)
Source: Phytochemistry Letters - July 11, 2018 Category: Chemistry Source Type: research

Three new pentacyclic triterpenoids from twigs of Manniophyton fulvum (Euphorbiaceae)
Publication date: October 2018Source: Phytochemistry Letters, Volume 27Author(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 LaatschAbstractPhytochemical 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-hydrox...
Source: Phytochemistry Letters - July 11, 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 - July 11, 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 2018Source: Phytochemistry Letters, Volume 27Author(s): Chimène Victoire Tchamadeu Keugwa, Jules Lobe Songue, Alain Tadjong Tcho, Alain François Kamdem Waffo, Jean Duplex Wansi, Jean Claude NdomAbstractThree 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 (welwitschiila...
Source: Phytochemistry Letters - July 11, 2018 Category: Chemistry Source Type: research

A new coumaronochromone and a new alkanoyl-dihydrofuranoflavone glycoside from Eriosema robustum (Fabaceae)
Publication date: October 2018Source: Phytochemistry Letters, Volume 27Author(s): Maurice Ducret Awouafack, Chin Piow Wong, Pierre Tane, Hiroyuki MoritaAbstractA 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 ...
Source: Phytochemistry Letters - July 11, 2018 Category: Chemistry Source Type: research

Three new constituents from the aerial parts of Tetrastigma hemsleyanum
Publication date: October 2018Source: Phytochemistry Letters, Volume 27Author(s): Cai Yi Wang, Ji Sun Lee, Xiang Dong Su, Hong Xu Li, Sang Kook Lee, Heng-Shan Wang, Young Ho Kim, Seo Young YangAbstractThree 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-dimens...
Source: Phytochemistry Letters - July 11, 2018 Category: Chemistry Source Type: research

Nematicidal compounds of Peperomia japonica
Publication date: October 2018Source: Phytochemistry Letters, Volume 27Author(s): Kazumi Nagashima, Yoshi Yamano, Sachiko Sugimoto, Kenji Ishiwata, Hirotaka Kanuka, Hideaki Otsuka, Katsuyoshi MatsunamiAbstractOn 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 ...
Source: Phytochemistry Letters - July 11, 2018 Category: Chemistry Source Type: research

Phylogenetic analysis and diversity of novel endophytic fungi isolated from medicinal plant Sceletium tortuosum
Publication date: October 2018Source: Phytochemistry Letters, Volume 27Author(s): Madira Coutlyne Manganyi, Thierry Regnier, Ajay Kumar, Cornelius Carlos Bezuidenhout, Collins Njie AtebaAbstractThroughout 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...
Source: Phytochemistry Letters - July 11, 2018 Category: Chemistry Source Type: research

Amberboin and lipidiol: X-ray crystalographic data, absolute configuration and inhibition of cholinesterase
Publication date: October 2018Source: Phytochemistry Letters, Volume 27Author(s): Mahmoud Fahmi Elsebai, Hazem A. Ghabbour, Amani M. Marzouk, Ramin Ekhteiari Salmas, Ilkay Erdogan Orhan, Fatma Sezer SenolAbstractThe phytochemical investigation of the extract of Volutaria abyssinica (A. Rich.) C. Jeffrey (Asteraceae) resulted in the identification of the two sesquiterpene lactones, i.e. amberboin and lipidiol. Amberboin and lipidiol are interesting tricyclic sesquiterpene lactone derivatives with a guaianolide skeleton. In the current study, the absolute structure and absolute configuration of amberboin were determined for ...
Source: Phytochemistry Letters - July 11, 2018 Category: Chemistry Source Type: research

Structure activity relationships and antinociceptive activity of two novel dammarane-type sapogenins with notable anticancer effect
Publication date: October 2018Source: Phytochemistry Letters, Volume 27Author(s): Youzhen Zhang, Shanshan Chen, Lu Ma, Xude Wang, Guangyue Su, Yuqing ZhaoAbstractThis current study aimed to investigate the antinociceptive effect of 20(R)-25-methoxydammarane-3β, 12β, 20-triol (25-OCH3-PPD) and 20(R)-dammarane-3β, 12β, 20, 25-tetrol (25-OH-PPD), the two novel dammarane-type anticancer sapogenins isolated from ginseng. And the structure activity relationship of various ginseng sapogenins and saponins was also discussed. The effect was studied in hot-plate test and acetic acid induced abdominal writhing tes...
Source: Phytochemistry Letters - July 11, 2018 Category: Chemistry Source Type: research

Leptothiazinones A and B, two new Benzothiazinones from a marine-derived fungus Leptosphaerulina chartarum 3608
Publication date: October 2018Source: Phytochemistry Letters, Volume 27Author(s): Panpan Zhang, Chunxiu Jia, Jiajia Lang, Hongjie Shen, Jing Li, Senhua Chen, Lan LiuAbstractTwo new benzothiazinones, namely leptothiazinones A and B (1 and 2) were isolated from the marine-derived fungus Leptosphaerulina chartarum 3608. The structures of compounds 1 and 2 were elucidated by extensive spectroscopic analysis, including HR-ESIMS, 1D and 2D NMR, and single-crystal X-ray diffraction analysis. Leptothiazinone B possessing a benzo[b][1,4]thiazin-2-one skeleton was first reported in natural sources. Both of them were tested for their...
Source: Phytochemistry Letters - July 11, 2018 Category: Chemistry Source Type: research

New norclerodane diterpenoids from Dioscorea bulbifera
Publication date: October 2018Source: Phytochemistry Letters, Volume 27Author(s): Guo-Kai Wang, Juan Zheng, Yun-peng Sun, Wen-fang Jin, Hui-wen Liu, Yang Yu, Zhong-yu Zhou, Jin-song LiuAbstractThree new norclerodane diterpenoids, diosbulbin E acetate (1), diosbulbin R (2), and diosbulbin S (3), and seven known compounds (4-10) were isolated from an ethanol extract of Dioscorea bulbifera tubers. The structure of compounds 1–10 was determined through extensive NMR and mass spectroscopic analyses. The new compounds were investigated to determine their cytotoxic activity against the SMMC-7721 cancer cell line.Graphical a...
Source: Phytochemistry Letters - July 11, 2018 Category: Chemistry Source Type: research

(‒)-Pteroside N and pterosinone, new BACE1 and cholinesterase inhibitors from Pteridium aquilinum
Publication date: October 2018Source: Phytochemistry Letters, Volume 27Author(s): Yun-Hyeok Choi, Chun Whan Choi, Jin Kyu Kim, Wonsik Jeong, Gil Hong Park, Seong Su HongAbstractBioassay-guided fractionation of the ethanolic extract from the whole plants of Pteridium aquilinum has resulted in the isolation of a new pterosin glycoside, (‒)-pteroside N (1), and a new seco-illudoid sesquiterpene, pterosinone (2). Their structures were identified by analysis of the spectroscopic data including extensive 2D NMR. All of the isolates were evaluated for the anti-Alzheimer disease (anti-AD) activity through enzyme inhibition of ac...
Source: Phytochemistry Letters - July 11, 2018 Category: Chemistry Source Type: research

New 7-oxoabietane-type diterpenoids from the bark of Cryptomeria japonica and their xanthine oxidase inhibitory activity
Publication date: October 2018Source: Phytochemistry Letters, Volume 27Author(s): Chi-I Chang, Tzong-Huei Lee, Yi-Jen Li, Che-Yi Chao, Bang-Jau You, Ming-Jen Cheng, Sheng-Yang Wang, Cheng-Chi Chen, Yueh-Hsiung KuoAbstractThree new 7-oxoabietane-type diterpenoids, 3-oxosugiol methyl ether (1), 18-hydroxysugiol (2), and 1β-hydroxysugiol (3), as well as two known 7-oxoabietane-type diterpenoids, 6α-hydroxysugiol (4) and 6α-acetoxysugiol (5), were isolated from the bark of Cryptomeria japonica D. Don. Their structures were elucidated mainly by NMR and HREIMS, as well as on comparison with the data of known ana...
Source: Phytochemistry Letters - July 11, 2018 Category: Chemistry Source Type: research

Polyketide-derived metabolites from the sponge-derived fungus Aspergillus sp. F40
Publication date: October 2018Source: Phytochemistry Letters, Volume 27Author(s): Yong-Qi Tian, Shu-Ting Lin, Kaliaperumal Kumaravel, Hong Zhou, Shao-Yun Wang, Yong-Hong LiuAbstractOne new anthraquinone, versiconol B (1), and one new xanthone, oxisterigmatocystin I (2), along with eight known compounds were isolated from liquid cultures of the sponge-derived fungus Aspergillus sp. F40. The gross structures were determined based on the NMR and mass spectroscopic data, and the absolute configurations were determined by comparison of optical rotation data with those earlier reported. Compounds 1-4 were evaluated for their ant...
Source: Phytochemistry Letters - July 11, 2018 Category: Chemistry Source Type: research

Rupestonic acids H and I, two new sesquiterpenes from the flowers of Artemisia rupestris L
Publication date: October 2018Source: Phytochemistry Letters, Volume 27Author(s): Jian Xiao, Fu-Rong Jiao, Xiang Zhao, Wan-Tong Zhong, Dong-Zhu Duan, Le Wang, Xiao-Ling WangGraphical abstract (Source: Phytochemistry Letters)
Source: Phytochemistry Letters - July 11, 2018 Category: Chemistry Source Type: research

Protective effect of carnosic acid and its semisynthetic derivatives against H2O2-induced neurotoxicity
Publication date: October 2018Source: Phytochemistry Letters, Volume 27Author(s): Xinxin Liang, Haofei Yu, Weiyan Hu, Lanchun Zhang, Weimin Yang, Cheng Jin, Dandan Liu, Rongping ZhangAbstractCarnosic acid and its new derivatives (17 in total) were tested for their protective effects on hippocampal neuron against H2O2-induced damage using cell counting kit-8. Carnosic acid and its derivatives showed significant neuroprotective activity. Moreover, ester 4 and amides 5k, 5 l, 5 m had higher activity than that of carnosic acid. The catechol hydroxyl groups and carboxyl groups might not be truly necessary for the neuroprote...
Source: Phytochemistry Letters - July 11, 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 2018Source: Phytochemistry Letters, Volume 26Author(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.AbstractThree 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 ...
Source: Phytochemistry Letters - July 6, 2018 Category: Chemistry Source Type: research

Three new chlorophenolic glucosides from Curculigo orchioides Gaertn
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(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 ZhangAbstractThree 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 m...
Source: Phytochemistry Letters - July 6, 2018 Category: Chemistry Source Type: research

Chemical constituents of the stems of Neolitsea kedahensis Gamble
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(s): Nor Akmalazura Jani, Hasnah Mohd Sirat, Farediah Ahmad, Salam Ahmed Abed, Nurul Iman AminudinAbstractTwo new β-carboline alkaloids, daibucarbolines D (1) and E (2) and one new sesquiterpene dilactone, pseudovillosine (3), together with five known compounds, taraxerone, taraxerol, pseudoneoliacine, daibucarboline A and linderaggrine A were isolated from the stems of Neolitsea kedahensis (Lauraceae). The structures were confirmed through extensive spectroscopic analysis, while the relative configuration of compound (3) was determined by a s...
Source: Phytochemistry Letters - July 6, 2018 Category: Chemistry Source Type: research

Understanding health-related properties of bushmint (Hyptis) by pharmacokinetic modelling of intestinal absorption
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(s): Jamie Selby-Pham, Sophie N.B. Selby-Pham, Kimber Wise, Louise E. BennettAbstractHyptis 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 hu...
Source: Phytochemistry Letters - July 6, 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 2018Source: Phytochemistry Letters, Volume 26Author(s): Jong Hoon Ahn, Yang Hee Jo, Seon Beom Kim, Ayman Turk, Kyung-Eon Oh, Bang Yeon Hwang, Ki Yong Lee, Mi Kyeong LeeAbstractScreening 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...
Source: Phytochemistry Letters - July 6, 2018 Category: Chemistry Source Type: research

Sesquiterpenoids from Ainsliaea yunnanensis and their cytotoxic activities
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(s): Xin Fang, Ren-Tao Zeng, Zhi-Guo Zhuo, Yun-Heng Shen, Wei-Dong ZhangAbstractThree new sesquiterpenoids, named yunnanolides J-K and yunnanol A (1-3), together with ten known sesquiterpenoids (4-13), have been isolated from the dried whole plants of Ainsliaea yunnanensis Franch. The chemical structures of compounds 1-3 were elucidated by NMR and HRESIMS analysis. All the compounds were tested for in vitro cytotoxicity against three human tumor cell lines (95D, MDA-MB-231, and HepG2). Compound 13 showed moderate cytotoxicity against human cancer c...
Source: Phytochemistry Letters - July 6, 2018 Category: Chemistry Source Type: research

Benzoxazinoid and indoxyl glycosides from Wrightia religiosa
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(s): Poolsak Sahakitpichan, Nitirat Chimnoi, Chutima Srinroch, Somsak Ruchirawat, Tripetch KanchanapoomAbstractA 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), simp...
Source: Phytochemistry Letters - July 6, 2018 Category: Chemistry Source Type: research

Antagonistic metabolites produced by the fungus Curvularia sp. BCC52426 against Aspergillus sp. BCC51998
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(s): Nantiya Bunbamrung, Chakapong Intaraudom, Aibrohim Dramae, Nattawut Boonyuen, Rungtiwa Chanthaket, Pranee Rachtawee, Pattama PittayakhajonwutAbstractFour 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 s...
Source: Phytochemistry Letters - July 6, 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 2018Source: Phytochemistry Letters, Volume 26Author(s): Cyrille Ngoufack Tagousop, David Ngnokam, Dominique Harakat, Laurence Voutquenne-NazabadiokoAbstractFive 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 l...
Source: Phytochemistry Letters - July 6, 2018 Category: Chemistry Source Type: research

Flavonoids and saponins from two Bulgarian Astragalus species and their neuroprotective activity
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(s): Aleksandar Shkondrov, Ilina Krasteva, Franz Bucar, Olaf Kunert, Magdalena Kondeva-Burdina, Iliana IonkovaAbstractTwo 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...
Source: Phytochemistry Letters - July 6, 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 2018Source: Phytochemistry Letters, Volume 26Author(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 WuAbstractTwo 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 ...
Source: Phytochemistry Letters - July 6, 2018 Category: Chemistry Source Type: research

Unveiling the fungal biotransformation of hydralazine using 13C-precursor
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(s): Marilia O. Almeida, Adriana A. Lopes, Patricia G. Roberto, Bianca W. Bertoni, Mônica T. PupoAbstractThe 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) analy...
Source: Phytochemistry Letters - July 6, 2018 Category: Chemistry Source Type: research

Two new cyclopropane monoterpene epimers from Varthemia iphionoides of Jordanian origin
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(s): Mahmoud A. Al-Qudah, Musa H. Abu Zarga, Monther A. Khanfar, Hala I. Al-Jaber, Sultan T. Abu Orabi, Konrad SeppeltAbstractTwo 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 - July 6, 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 2018Source: Phytochemistry Letters, Volume 26Author(s): Yukiko Takenaka, Takao TanahashiAbstractThe 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 me...
Source: Phytochemistry Letters - July 6, 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 2018Source: Phytochemistry Letters, Volume 26Author(s): Gui-yun Cao, Xiao-hong Wang, Ke-ke Li, Ai-hong Zhao, Li Shen, Duo-nan YuAbstract1,2-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 ...
Source: Phytochemistry Letters - July 6, 2018 Category: Chemistry Source Type: research

Three novel 14-epiarborane triterpenoids from Imperata cylindrica Beauv. var. major
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(s): Yuki Sakai, Junichi Shinozaki, Akihito Takano, Kazuo Masuda, Takahisa NakaneAbstractThree 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 a...
Source: Phytochemistry Letters - July 6, 2018 Category: Chemistry Source Type: research

New indane and naphthalene derivatives from the rhizomes of Kniphofia reflexa Hutchinson ex Codd
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(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 ChoudharyAbstractTwo 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 tech...
Source: Phytochemistry Letters - July 6, 2018 Category: Chemistry Source Type: research

O-Glucoside of natural cleomiscosin-A: An attenuator of pro-inflammatory cytokine production
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(s): Ahil Sajeli Begum, S. Santhosh Kumar, Suryanarayana Gottapu, Kirti HiraAbstractThe 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-gl...
Source: Phytochemistry Letters - July 6, 2018 Category: Chemistry Source Type: research

Four new sesquiterpenes from Atractylodes lancea
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(s): Jian-Shuang Jiang, Kuo Xu, Zi-Ming Feng, Ya-Nan Yang, Pei-Cheng ZhangAbstractFour 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 chromatogr...
Source: Phytochemistry Letters - July 6, 2018 Category: Chemistry Source Type: research

Three new diterpenes from the seeds of Caesalpinia minax Hance and their anti-inflammatory activity
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(s): Qin Liu, Bai Bai, Juan Shen, Sheng-qing Wu, Long-ping Zhu, De-po Yang, Zhi-min ZhaoAbstractThree 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 displ...
Source: Phytochemistry Letters - July 6, 2018 Category: Chemistry Source Type: research

Three new 2-(2-phenylethyl)chromone derivatives from artificial holing agarwood of Aquilaria sinensis
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(s): Tong-Dong Kuang, Hui-Qin Chen, Fan-Dong Kong, Cai-Hong Cai, Li Yang, Wen-Li Mei, Hao-Fu DaiAbstractThree 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 o...
Source: Phytochemistry Letters - July 6, 2018 Category: Chemistry Source Type: research

Total synthesis of Crotogossamide using an on-resin concomitant cyclization/cleavage reaction
Publication date: August 2018Source: Phytochemistry Letters, Volume 26Author(s): Christopher Bérubé, Alexandre Borgia, Gaëlle Simon, Daniel Grenier, Normand VoyerAbstractCrotogossamide, 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 Crot...
Source: Phytochemistry Letters - July 6, 2018 Category: Chemistry Source Type: research