Chemical screening and antibacterial activity of essential oil and volatile fraction of Dictyopteris polypodioides

Publication date: January 2020Source: Microchemical Journal, Volume 152Author(s): Nacera Riad, Mohamed Reda Zahi, Emanuela Trovato, Naima Bouzidi, Yasmina Daghbouche, Margita Utczás, Luigi Mondello, Mohamed El HattabAbstractThe genus Dictyopteris, comprising 35 species, is known by its characteristic marine fragrances which is mainly associated to aspecific chemical composition. Dictyopteris polypodioides (D. polypodioides), known as Dictyopteris membranacea (D. membranacea), is distributed in several region of the world and characterized by a wide range of bioactive compounds. In the current research, the chemical composition and antibacterial activity of the volatile fraction (VF) and essential oil (EO) of D. polypodioides are reported in a comparative objective. The VF was prepared from the crude ether extract, whereas, the EO was made from the dried alga. The GC/MS analysis of the VF and the EO revealed the presence of 72 and 70 compounds accounting for 86.4% and 80.6% of the total composition respectively. The main constituents in both oils were 3-hexyl-4,5-dithiacycloheptanone and dictyopterene. The antibacterial activity of the VF and the EO were evaluated by liquid-broth dilution method, against six strains including Staphylococcus aureus, Agrobacterium tumefaciens, Salmonella typhimurium, Bacillus cereus, Micrococcus luteus and Escherichia coli. Kanamycin and chloramphenicol were used as antibiotics references.The EO has shown a high inhibitory effect against ...
Source: Microchemical Journal - Category: Chemistry Source Type: research

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Abstract Natural extracts containing high polyphenolic concentration possess antibacterial, anti-parasitic and fungicidal activities. The present research characterises two extracts based on white grape marc, a winemaking by-product, describing their physicochemical features and antimicrobial capacities. The main components of these extracts are phenolic acids, flavan-3-ols and their gallates and flavonols and their glycosides. As a result of this complex composition, the extracts showed pronounced bioactivities with potential uses in agricultural, pharmaceutical and cosmetic industries. Polyphenol compounds were ...
Source: Environmental Science and Pollution Research International - Category: Environmental Health Authors: Tags: Environ Sci Pollut Res Int Source Type: research
Publication date: Available online 8 January 2020Source: Microbial PathogenesisAuthor(s): Raju Rajasabapathy, Sanjeev C. Ghadi, Balakrishnan Manikandan, Chellandi Mohandass, Akhila Surendran, Syed G. Dastager, Ram M. Meena, Rathinam Arthur JamesAbstractCulturable bacteria associated with marine sponges and coral mucus (collected from Gulf of Mannar and Palk Bay) were screened for their prospective antimicrobial compounds against 9 bacterial pathogens (Bacillus megaterium, B. cereus, Salmonella typhimurium, Staphylococcus aureus, Proteus vulgaris, Klebsillla pneumoniae, Escherichia coli, Pseudomonas aeruginosa and Acinetoba...
Source: Microbial Pathogenesis - Category: Infectious Diseases Source Type: research
Publication date: Available online 26 December 2019Source: Food BioscienceAuthor(s): Seyedeh-Maryam Hasheminya, Jalal DehghannyaAbstractChemical compounds, total phenolic content, antioxidant and antimicrobial activity of Pistacia atlantica subsp. kurdica hulls’ essential oil (EO) was investigated. The EO was extracted using hydrodistillation and its GC-MS analysis showed 95 compounds, the most important of which were α-pinene (10.8%), β-citral (7.0%), carvone hydrate (4.4%), myristic acid (4.9%), p-acetyltoluene (3.5%), pinocarveol (3.3%) and palustrol (3.3%). Total phenolic compounds in the EO was 178 ...
Source: Food Bioscience - Category: Food Science Source Type: research
Publication date: 15 March 2020Source: Journal of Molecular Structure, Volume 1204Author(s): Duygu Şahin Gül, Hatice Ogutcu, Zeliha HayvalıAbstractTwo different series of crown ether compounds (4-11) were synthesized by the reactions of 4′,5′-bis(bromomethyl)benzo-15-crown-5 (3) and 4′-amino-benzo-15-crown-5 with hydroxycoumarin and chromone derivatives. Coumarin-crown ether compounds (4 and 5) were synthesized by the reactions of 4′,5′-bis(bromomethyl)benzo-15-crown-5 (3) with 4-hydroxycoumarin and 7-hydroxycoumarin. Chromone-crown ether compounds (6-11), were synthesized by the conden...
Source: Journal of Molecular Structure - Category: Molecular Biology Source Type: research
Publication date: Available online 14 November 2019Source: Carbohydrate PolymersAuthor(s): Ruzanna Ahmad Shapi’i, Siti Hajar Othman, Norhazirah Nordin, Roseliza Kadir Basha, Mohd Nazli NaimAbstractChitosan nanoparticles (CNP) were synthesized via ionic gelation and used for the preparation of starch-based nanocomposite films containing different concentration of CNP (0, 5, 10, 15, 20% w/w). Antimicrobial properties of starch/CNP films was evaluated via in vitro (disc diffusion analysis) and in vivo (microbial count in wrapped cherry tomatoes) study. It was found that inhibitory zone of the 15 and 20% of starch/CNP fi...
Source: Carbohydrate Polymers - Category: Biomedical Science Source Type: research
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Source: Mycoscience - Category: Biology Source Type: research
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Source: LWT Food Science and Technology - Category: Food Science Source Type: research
Abstract Two new meroditerpene pyrones, chevalone F (1) and 11-hydroxychevalone E (2), a new tryptoquivaline analog, tryptoquivaline V (3) and a new brasiliamide analog, brasiliamide G (4), together with thirteen known compounds, chevalones A-C (5-7), chevalone E (8), 11-hydroxychevalone C (9), pyripyropene A (10), isochaetominine C (11), pyrrolobenzoxazine terpenoids CJ-12662 (12) and CJ-12663 (13), fischerindoline (14), eurochevalierine (15), 1,4-diacetyl-2,5-dibenzylpiperazine-3,7''-oxide (16) and lecanorin (17) were isolated from the fungus Neosartorya pseudofischeri. Their structures were established on the b...
Source: Fitoterapia - Category: Biochemistry Authors: Tags: Fitoterapia Source Type: research
The objective of this study was to measure the inactivation efficiencies of intense pulsed light (IPL) on six types of bacteria and determine how the efficiency values are related to the spectral transmittance of IPL. All of the microorganisms exhibited up to 7-log CFU/mL reductions, and the double-Weibull survival model provided the best fit to the inactivation curves. We obtained 4Dv values (which is the fluence required to inactivate 99.99% of viable cells) and zv values (which is the increase in lamp voltage required for a 1-log reduction of the 4Dv value) for lamp voltages ranging from 800 to 1800 V (corresponding t...
Source: Innovative Food Science and Emerging Technologies - Category: Food Science Source Type: research
In this study, a transposon mutagenesis approach was applied to reveal the factors involved in resistance to oxidative stress, and the biofilm formation among mutants and WT strains were further detected using crystal violet staining (CVS), scanning electron microscopy (SEM), and confocal laser scanning microscopy (CLSM) to reveal potential relationship between oxidative stress and biofilm formation. Materials and Methods The Development of Mutants Library The procedure of transposon mutagenesis approach was performed as described by Zhang et al. (2018). Screening of Mutants Tolerance to Oxidative Stress For screening...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
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