Evaluation of Eight Orange Fleshed Sweetpotato (OFSP) Varieties for Their Total Antioxidant, Total Carotenoid and Polyphenolic Contents

Eight varieties of OFSP whose yields ranged from 6 t/ha (Caromex) to 15.22 t/ha (BF82xCIP-18) have a water content less than the current value observed for OFSP (71%).These varieties have been studied for their total antioxidant contents (TAC), total polyphenolic contents (TPC) and total carotenoid contents (TCC) using Ferric Reducing Antioxidant Power (FRAP), Folin-Ciocalteu reagent (FCR) and a method described by McMurry respectively. TAC differed significantly (p < 0.05) depending on the variety. Among the varieties obtained by crossing, BF92xResisto-14 and BF92xCIP-6 with the highest levels of total antioxidants (respectively 4.12 and 3.04 mg of Trolox equivalent/g of dw), had also the highest levels of total polyphenols (respectively 2.432 and 2.269 mg of Gallic acid equivalents/g of dw) and total carotenoids (respectively 0.180 and 0.132 mg of Beta-carotene equivalents/g of dw). There was a good correlation first, between the TAC and the TPC (r2 = 0.957) and between the TAC and the TCC (r2 = 0.867) on the other. Antioxidant activities observed may be due to the effect of synergy between polyphenols and carotenoids. Keywords: Yield, OFSP extracts, total antioxidant content, total polyphenolic content, total carotenoid content, FRAP, FCR

Effects of Organic and Mineral Fertilizers on total Antioxidant, polyphenolic and carotenoid contents of Orange fleshed sweetpotato tubers

Abstract A field study was conducted to determine the effect of organic and mineral-based fertilizers on phytochemical contents in the tubers of an orange fleshed sweetpotato variety (TIB-440060). Treatments were arranged in a split plot design with three replicates. Tubers harvested have been studied for their total antioxidant contents (TAC), total polyphenolic contents (TPC) and total carotenoid contents (TCC) using Ferric Reducing Antioxidant Power (FRAP), Folin-Ciocalteu reagent (FCR) and a method described by McMurry respectively. Organic fertilizer had a positive effect on the production of antioxidants, polyphenols and carotenoids whose contents increased significantly (P < 0.001) with the quantities of organic fertilizer. Increases about 19.61%, 34.41% and 12.82% due to annual (F1) inputs and increases about 15.94% and 15.46% and 12.17% respectively in total antioxidant, polyphenolic and carotenoid contents when these inputs of organic fertilizer are conducted biennially  (F2). The effect of different doses of mineral fertilizers indicated significant changes (P < 0.001) in accumulated antioxidant, polyphenolic and total carotenoids contents of TIB-440060 OFSP tubers. Total Antioxidant, polyphenolic and carotenoid contents of TIB-440060 varied significantly (P < 0.001) with the combination of organo-mineral fertilization used. Combinations using a minimal doses of 15 kg/ha of nitrogen, 30 kg/ha phosphorus and 45 kg/ha of potassium associated with an annual or biennial contribution of 20 t/ha of organic fertilizer gave the highest total antioxidant, polyphenolic and carotenoid concentrations. Keywords: OFSP extracts, phytochemical contents, polyphénols, antioxidants, carotenoids, organic fertilizer, mineral fertilizers, FRAP, FC

Modification of the polarity of an anthocyanin pigment: Structure determination and antioxidant activity

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Two diglucosylated anthocyanins from Combretum paniculatum flowers

From Combretum paniculatum flowers, two diglucosylated derivatives from cyanidin and pelargonidin were identified using chromatographic (TLC), chemical (degradation by hydrolysis, tests of revelations) and spectral [UV-visible, 1H-NMR (1H and 13C, TOCSY-1D, DQF-COSY, NOESY-2D)] methods. These pigments were found to consist of cyanidin 3,5-O-β-D-diglu-copyranoside and pelargonidin 3,5-O-β-D-diglucopyranosidehttp://dx.doi.org/10.4236/ns.2012.43024info:eu-repo/semantics/publishe

Activités anti-radicalaires de 3 anthocyanines monoglucosides isolées des graines de Glycine max

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Activités anti-radicalaires de trois anthocyanines monoglucosides isolées des graines de Glycine max

Des graines du soja noir, Glycine max, cultivé au Burkina Faso, trois anthocyanes monoglucosides ont été isolées et caractérisées à l'aide de méthodes chimiques, chromatographiques (CCM, CLHP et CP), spectrométriques (UV-Vis. SM et RMN). Ainsi les graines de Glycine max renferment majoritairement la delphinidine 3-O-β-D-glucopyranoside, la cyanidine 3-O-β-D-glucopyranoside et la pétunidine 3-O-β-D-glucopyranoside. La méthode au DPPH nous a permis de déterminer les activités antioxydantes de chacun des trois anthocyanes de Glycine max. Les résultats ont été comparés à ceux du thé (thé Lipton) et du vin rouge trouvés dans le commerce local. Il ressort de cette étude la classification suivante selon un ordre croissant du pouvoir antioxydant: Extraits totaux du nin rouge < Extraits totaux de Glycine max < cyanidine 3-O-β-D-glucopyranoside < delphinidine 3-O-β-D-glucopyranoside < pétunidine 3-O-β-D-glucopyranoside < Thé Lipton.info:eu-repo/semantics/publishe

Modification de la polarité d'un composé anthocyanique de Ipomoea asarifolia: Détermination de la structure et de l'activité antioxydante

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Acylated anthocyanins from the flowers of Ipomoea asarifolia

Among several anthocyanins detected in the flowers of Ipomoea asarifolia, two acylated anthocyanins were isolated and studied using chemical, GC, mass spectrometric and extensive NMR methods (TOCSY-1D, DQF- COSY and HMBC measurements). The first anthocyanin was identified as cyanidin 3-O-[2-O-(6-O-(E-caffeoyl)-β-D-glucopyranosyl)-6-O-(E-caffeoyl)-β-D- glucopyranoside]-5-O-[β-D-glucopyranoside], and the new structure as cyanidin 3-O-[2-O-(6-O-(E-p-coumaroyl)-β-D-glucopyranosyl)-6-O-(E-caffeoyl)- β-D-glucopyranoside]-5-O-[β-D-glucopyranoside].SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Two triacylated and tetraglucosylated anthocyanins from Ipomoea asarifolia flowers

Two triacylated and tetraglucosylated anthocyanins derived from cyanidin were isolated from the flowers of Ipomoea asarifolia and their structures elucidated using chemical, GC, MS and NMR methods (1H and 13C, TOCSY-1D, DQF-COSY, DIFFNOE and HMBC). These complex pigments were found to consist of cyanidin 3-O-[2-O-(6-O-E-caffeoyl-β -D-glucopyranosyl)]-{6-O-[4-O-(6-O-E-3,5-dihydroxycinnamoyl-β -D-glucopyranosyl)-E-caffeoyl]-β-D-glucopyranosyl}-5-O-β -D-glucopyranoside and cyanidin 3-O-[2-O-(6-O-E-p-coumaroyl-β -D-glucopyranosyl)]-{6-O-[4-O-(6-O-E-p-coumaroyl-β-D-glucopyranosyl) -E-caffeoyl]-β-D-glucopyranosyl}-5-O-β-D-glucopyranoside. © 2003 Elsevier Ltd. All rights reserved.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Etude comparative d’extraits des calices, des étamines et des pétales des fleurs de Bombax costatum

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