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Hypoglycaemic effect of Berberis vulgaris *** normal and streptozotocin-induced diabetic rats

Asian Pacific Journal of Tropical Biomedicine 2011年第6期1卷 468-471页

作者： Nawel Meliani Mohamed El Amine Dib Hocine Allali Boufeldja Tabti Laboraloire des substances naturelles et Bioactives (LASNABIO) departement de chimie Faculte des SciencesUniversite Aboubekr Belkaid BP 119

Objective:To achieve a primary pharmacological screening contained in the aqueous extract of Berberis vulgaris(***) and to examine the hypoglycaemic effect and biochemical parameters of aqueous and saponins extract on groups of rats rendered diabetic by injection of ***:The phytochemicol tests to detect the presence of different compounds were based on the visual observation of color change or formation of precipitate after the addition of specific *** was induced in rats by intraperitoneal(i.p.) injection of streptozotocin(STZ) at a dose of 65 mg/kg *** fasting blood glucose levels were estimated by glucose oxidase-peroxidase reactive strips(dextrostix,Bayer Diagnostics).Blood samples were taken by cutting the tip of the *** cholesterol and serum triglycerides were estimated by enzymatic DHBS colorimetric ***:Administration of 62.5 and 2S.0 mg/kg of saponins and aqueous extract respectively in normal rats group shows a significant hypoglycemic activity(32.33%and 40.17%respectively) during the first ***,diabetic group treated with saponin extract produced a maximum fall of 73.1%and 76.03%at day 1 and day 21 compared to the diabetics ***,blood glucose levels of the diabetic rats treated with aqueous extract showed decrease of 78.79%on the first day and the effect remains roughly constant during 3 week. Both extracts also declined significantly biochemical parameters(20.77%-49.00%).The control in the loss of body weight was observed in treated diabetic rats as compared to diabetic controls. Conclusions:These results demonstrated significant antidiabetic effects and showed that serum cholesterol and serum triglycerides levels were decreased,significantly,consequently this plant might be of value in diabetes treatment.

关键词： Berberis vulgaris L. Antidiabetic activity Streptozotocin-induced diabetes Saponins Aqueous extract Photochemical screening Hypoglycaemic effect Biochemical parameters Cholesterol Triglycerides Glucose oxidase-peroxidase Colorimetric method

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Overexpression of the angiogenic tetrapeptide AcSDKP and the prolyl oligopeptidase(POP) is a common feature of cancer

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生物物理学报 2009年第S1期25卷 32-33页

作者： Jérme Bignon Alexia Pinault Joanna Wdzieczak-Bakala Institut de chimie des substances naturelles CNRS 91198 Gif-sur-Yvette France

Prolyl oligopeptidase (POP) is a cytosolic enzyme involved in the metabolism of many peptide hormones and neuropeptides (1). It was recently reported that POP is responsible

关键词： AcSDKP Overexpression of the angiogenic tetrapeptide AcSDKP and the prolyl oligopeptidase is a common feature of cancer POP

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Synthesis of a novel uridine analogue and its use in attempts to form new cyclonucleosides using ring-closing metathesis

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Science China Chemistry 2010年第9期53卷 1932-1936页

作者： MONDON Martine LEN Christophe UMR 6514 Université de Poitiers CNRS Synthèse et Réactivité des Substances Naturelles EA4297 Université de Technologie de Compiègne UTC-Ecole Supérieure de chimie organique et Minérale ESCOM

One novel nucleoside analogue having a hex-5-enyl group and an allyl group in the 5'-C and 3-N position was synthesized regioand diastereoselectively from D-glucose in twelve *** order to reach a particular conformation of nucleosides the nucleoside formation of restricted cyclonucleoside analogues was studied via Ring-Closing Metathesis.

关键词： nucleoside restrictedconformation metathesis

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Phytochemical Study and Comparative Antioxidant Activity of Extracts from Aerial Parts of <i>Chenopodium ambrosioides</i>Linn. (Chenopodiaceae)

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Advances in Biological Chemistry 2021年第5期11卷 220-233页

作者： Gneiny Whad Tchani Kossi Sitsopé Agbeme Kokou Agbékonyi Agbodan Gnon Baba Kafui Kpegba laboratoire de chimie organique et des substances naturelles (Lab COSNat) Faculté des Sciences Université de Lomé Lomé Togo laboratoire de Génie des Procédés et Ressources naturelles (LAGEPREN) Département de Chimie Université de Lomé Lomé Togo

The use of Chenopodium ambrosioides in some communities in Togo reveals its importance and its medicinal properties. The plant is often infused for medicinal drinks before use. Thus, through a comparative study, this work focused on the identification of the different phytochemical groups and then on the anti-radical capacities of ethanolic and aqueous extracts of aerial parts (lea- ves and seeds) of Chenopodium ambrosiooides obtained by maceration and infusion. The phytochemical tests, carried out on the various extracts, showed that they contained certain biomolecules such as flavonoids and tannins. Likewise, the presence of terpenoids and terpenes has been detected. However, it is only in aqueous extracts that the alkaloids have been revealed. The determination of the polyphenol content of the extracts revealed that the aqueous infusion contains 25.699 mgGAE/g DE, followed by the aqueous macera

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Plant Cell Wall, a Challenge for Its Characterisation

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Advances in Biological Chemistry 2016年第3期6卷 70-105页

作者： Guy Costa Idelette Plazanet laboratoire de chimie des substances naturelles (EA 1069) Faculté des Sciences et Techniques Limoges Cedex France

The plant cell wall is a complex 3D network composed of polysaccharides, lignin and proteins. The knowledge of the structure and content of each cell wall polymer is a prerequisite to understand their functions during plant development and adaptation but also to optimise their industrial applications. The analysis of cell wall compounds is complicated by their multiple molecular interactions. In this review, we present numerous methods to purify, characterise and quantify proteins, polysaccharides and lignin from the wall. Two kinds of approaches are detailed: the first presents in vitro methods which involve the breakdown of the molecular linkages between polymers thanking to chemical, physical and/or enzymatic treatments. The second approach describes in situ methods that allow the cell wall polymer characterisation thanking to many analytical techniques coupled with microscopy. If microscopy is the common point of all of them, their development is associated with improvement of analytical techniques, increasing their power of resolution.

关键词： Polysaccharides Proteins Lignin Purification Spectroscopy Chromatography Immunology Microscopy Plant Cell Wall

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Extraction and Characterization of Aucoumea klaineana Pierre (Okoume) Extractives

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Journal of Renewable Materials 2019年第6期7卷 517-522页

作者： Engozogho Anris Starlin Peguy Bikoro Bi Athomo Arsene Vidal Marcia denaud Louis Safou Tchiama Rodrigue Charrier Bertrand CNRS/Univ Pau&Pays Adour Institut des Sciences Analytiques et de Physico-Chimie pour l’Environnement et les Matériaux-XylomatUMR525440004Mont de MarsanFrance laboratoire de Recherche et de Valorisation du Matériau Bois(LaReVa Bois).Ecole Normale Supérieure d’Enseignement Technique(ENSet).BP.3989 LibrevilleGabon laboratoire des substances naturelles et de Synthèses Organométalliques(LASNSOM).Unitéde Recherche en chimie(URChi).BP.941 Universitédes Sciences et Techniques de Masuku.Franceville Gabon laboratoire Bourguignon des Matériaux et Procédé ClunyFrance Ecole Catholique d'Arts et Métiers(ECAM) 40 Montée Saint Barthéllemy69321Lyon cedex O5France-Lyon

In order to promote convenient strategies for the utilization of wood wastes from aucoumea klaineana pierre(okoume)timber industry,various chemical analysis were carried out on samples from different *** extractives content of the bark,sapwood and heartwood of okoume were *** analyses were performed and the stiasny number was *** was found that the bark was richer in fatty acid of high molecular weight while the sapwood was rich in fatty acid of low molecular *** condensed tannins content varied according to the origin and the part of the *** new findings should be useful for green okoume based tannin adhesives.

关键词： Extractibles fatty acids tannins polyphenols stiasny number TGA

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Rosa x alba:source of essential minerals and volatile oils

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Natural Products and Bioprospecting 2011年第1期1卷 57-61页

作者： Karim HOSNI laboratoire des substances naturelles Institut National de Recherche et d’Analyse Physicochimique(INRAP)Pôle technologique de Sidi Thabet2020ArianaTunisia

Rosa x alba is cultivated almost exclusively for the production of aromatic water and fruits widely used as ingredients in some traditional food preparations sold *** of the proximate and elemental analyses revealed that flowers exhibited higher moisture content while the dry matter content was higher in *** fat and ash was higher in fruits when compared with leaves and *** studied organs were found to be rich in essential mineral such as K,Ca,P and *** and quantitative analysis of the volatile oils revealed different composition patterns between *** and geraniol were found as major constituents of the leaf oil whereas 2-phenethyl alcohol and eugenol were the major constituents of the floral *** contrast,fruits showed very distinct composition and alkanes/alkenes were found to have the major *** present composition could justify the traditional use of Rosa x alba which could be considered as a potential source of essential minerals and volatile constituents.

关键词： Rosa x alba Rosaceae proximate composition essential minerals volatile oil constituents

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Chemical Composition of Different Extracts of Conyza bonariensis: Insecticidal and Nematicidal Activities

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American Journal of Analytical Chemistry 2023年第2期14卷 95-120页

作者： Kodjo Adande Kodjo Eloh Oudjaniyobi Simalou Marie-France Bakaï Pierluigi Caboni laboratoire de chimie organique et des substances naturelles (Lab COSNat) Département de Chimie Faculté Des Sciences Université de Lomé Lomé Togo laboratoire de chimie organique et des Sciences de l’Environnement (LaCOSE) Département de Chimie Faculté Des Sciences et Techniques Université de Kara Kara Togo department of Life and Environmental Sciences University of Cagliari Cagliari Italy

C. bonariensis (L.) Cronq. known as hairy fleabane was first described in Argentina but it is now widely spread through most warmer regions of Europe, Africa, Asia, the Caribbean and Central America. In this work, a chemical analysis by liquid and gas chromatography coupled with mass spectrometry of the whole plant, aerial part, flowers and roots extracts of C. bonariensis harvested in Togo (West Africa) was carried out. Two acetylenic compounds Lachnophyllum ester and limonene were identified as the main components of essential oils while Lachnophyllum and Matricaria lactones were dominant in chloroform extracts. Based on the plant chemical compositions, essential oils and chloroform extracts were tested on cowpea weevil Callosobruchus maculatus adults which are considered as one of the most cosmopolitan pests of stored beans, and on freshly hatched second-stage juveniles of root-knot nematode Meloidogyne incognita. Results showed that the whole plant essential oil demonstrated an LC50/24h value of 1.75 μL oil/L air on C. maculatus while at 3.91 μL oil/L air, it showed 100% mortality. Furthermore, the plant root chloroform extracts partitioned in diethyl ether-hexane mixture showed the strongest nematicidal activity with an LC50/72h value of 0.47 mg/mL. Our findings suggest that the widely diffused plant C. bonariensis and its acetylenic constituents could be considered as potent botanical insecticidal and nematicidal agents.

关键词： Conyza bonariensis Insecticidal Activity Nematicidal Activity Callosobruchus maculatus Meloidogyne incognita

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Structures, Lipophilicity, Dipole Moments, Acidity and Spectroscopic Properties of Non-Steroidal Anti-Inflammatory Drugs Diclofenac, Bromfenac and Amfenac: A Theoretical Study

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Computational Chemistry 2019年第4期7卷 95-105页

作者： Assoma Amon Benjamine Bede Affoué Lucie Yapo Kicho denis Bamba El Hadji Sawaliho laboratoire de chimie organique et de substances naturelles Université Félix Houphou&#235 t-Boigny Abidjan C&#244 te d’Ivoire

This work is a contribution of theoretical chemistry to the classification of some non-steroidal anti-inflammatory drugs (NSAIDs). Indeed, research on the efficacy of NSAIDs has shown that no NSAID is recognized as the most efficient anti-inflammatory drug. We have made a theoretical study of diclofenac, bromfenac and amfenac, in order to compare their efficacy from some physicochemical properties. To do this, we used the DFT and TD-DTF methods at the B3LYP/6-311+G(d, p) level theory. The lipophilicity study shows that diclofenac and bromfenac are very lipophilic. Acidity study shows that diclofenac is more acid than bromfenac and amfenac. The results from molecular orbital and the TD-DFT calculations reveal that for the three NSAIDs, the lowest energy transition is due to the excitation from HOMO to LUMO. The absorption energy corresponding to H→L transition is comparable with the energy gap value. Our findings have shown that bromfenac is more reactive than amfenac, which is more reactive than diclofenac.

关键词： Diclofenac Bromfenac Amfenac DFT Spectroscopic Properties

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Identification of Phenolic Compounds from *** by Selected Chromatographic and Spectrometric Techniques

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Journal of Renewable Materials 2021年第1期9卷 35-48页

作者： A.Bikoro Bi Athomo S.P.Engozogho Anris R.Safou Tchiama F.Eyma C.Arnaudguilhem B.Charrier CNRS Universitéde Pau et des Pays de l’AdourInstitut des Sciences Analytiques et de Physico-Chimie pour l’Environnement et les Matériaux-XylomatUMR5254Mont de MarsanFrance laboratoire de Recherche et de Valorisation du Matériau Bois(LaReVa Bois) Ecole Normale Supérieure d’Enseignement Technique(ENSET)LibrevilleGabon laboratoire des substances naturelles et de Synthèses Organométalliques(LASNSOM) Unitéde Recherche en ChimieUniversitédes Sciences et Techniques de MasukuFrancevilleGabon Institut Clément Ader(ICA) Universitéde ToulouseCNRSUMR 5312-INSA-ISAE-Mines Albi-UPSTarbesFrance CNRS Univ Pau&Pays de l’Adour/E2S UPPAInstitut des Sciences Analytiques et de Physicochimie pour l’Environnement et les MatériauxUMR5254PauFrance

A complementary approach using Liquid Chromatographic-Mass Spectrometric analysis was proposed to characterize phenolic compounds from the methanol-water extracts of *** *** High Performance Liquid Chromatography(HPLC)complementary methods were used for the determination of phenolic compounds from the bark,sapwood and heartwood of *** employed involved direct analysis after filtration at 0.20μm,using a RP C18 column and UV-VIS/ESI-FTMS *** methods used were different by their elution gradient and allowed analyzing the chemical composition of three parts of African mahogany *** this study,22 phenolic compounds and derivatives from *** were separated,determined or tentatively characterized for the first time based on their methanol/water/formic acid extract mass *** difference of gradients eluted various compounds,8 were obtained with the first method and 14 with the second *** main products were hydroxybenzoic acid and derivatives,resorcinol,esterified compounds,mannitol,quercetin and derivatives,dihydroxyflavan,and trihydroxyflavan.

关键词： Bark RP_HPLC ESI-FTMS sapwood heartwood K.ivorensis phenolic compounds

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