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Assessment of the polyphenolic composition of the organic extracts of Mauritian black teas: a potential contributor to their antioxidant functions.
Biofactors 2006; 27(1-4):79-91B

Abstract

There is increasing interest in the emerging view that tea improves the antioxidant status in vivo and thereby helps to lower risk of certain types of cancer, coronary heart disease and stroke and its component biofactors could provide prophylactic potential for these diseases. The polyphenolic composition and the antioxidant properties of organic extracts (acetone/methanol) of Mauritian commercial black teas were evaluated. HPLC data of the individual compounds revealed remarkably high levels (+)-Catechin ((+)-C), (-)-epicatechin ((-)-EC), (-)-epicatechin 3-gallate ((-)-ECG), (-)-epigallocatechin ((-)-EGC), (-)-epigallocatechin 3-gallate ((-)-EGCG) and gallic acid. Analysis of hydrolysed extracts indicated that quercetin was the dominant flavonol aglycone with traces of myricetin and kaempferol. Based on the Ferric Reducing Antioxidant Power (FRAP) and the Trolox Equivalent Antioxidant Capacity (TEAC) assays Extra tea from Bois Chéri exhibited the highest antioxidant potential. Linear regression analyses showed that the antioxidant capacities of the organic extracts are strongly influenced by total phenols (TEAC: r=0.95 and FRAP: r=0.96) and to a lesser extent by total proanthocyanidin and total flavonoid contents. Catechins and gallic acid seem to add up to the overall antioxidant capacity of black tea extracts. The fresh tea leaves had high levels of total phenols, total flavonoids, total proanthocyanidin and exhibited greater antioxidant potential when compared with black teas. Organic extracts of endemic teas represent useful source of phenolic antioxidants supplements for prophylactic use.

Authors+Show Affiliations

Department of Biosciences, Faculty of Science, University of Mauritius, Réduit, Republic of Mauritius.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17012766

Citation

Luximon-Ramma, Amitabye, et al. "Assessment of the Polyphenolic Composition of the Organic Extracts of Mauritian Black Teas: a Potential Contributor to Their Antioxidant Functions." BioFactors (Oxford, England), vol. 27, no. 1-4, 2006, pp. 79-91.
Luximon-Ramma A, Neergheen VS, Bahorun T, et al. Assessment of the polyphenolic composition of the organic extracts of Mauritian black teas: a potential contributor to their antioxidant functions. Biofactors. 2006;27(1-4):79-91.
Luximon-Ramma, A., Neergheen, V. S., Bahorun, T., Crozier, A., Zbarsky, V., Datla, K. P., ... Aruoma, O. I. (2006). Assessment of the polyphenolic composition of the organic extracts of Mauritian black teas: a potential contributor to their antioxidant functions. BioFactors (Oxford, England), 27(1-4), pp. 79-91.
Luximon-Ramma A, et al. Assessment of the Polyphenolic Composition of the Organic Extracts of Mauritian Black Teas: a Potential Contributor to Their Antioxidant Functions. Biofactors. 2006;27(1-4):79-91. PubMed PMID: 17012766.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Assessment of the polyphenolic composition of the organic extracts of Mauritian black teas: a potential contributor to their antioxidant functions. AU - Luximon-Ramma,Amitabye, AU - Neergheen,Vidushi S, AU - Bahorun,Theeshan, AU - Crozier,Alan, AU - Zbarsky,Virginia, AU - Datla,Krishna P, AU - Dexter,David T, AU - Aruoma,Okezie I, PY - 2006/10/3/pubmed PY - 2007/3/17/medline PY - 2006/10/3/entrez SP - 79 EP - 91 JF - BioFactors (Oxford, England) JO - Biofactors VL - 27 IS - 1-4 N2 - There is increasing interest in the emerging view that tea improves the antioxidant status in vivo and thereby helps to lower risk of certain types of cancer, coronary heart disease and stroke and its component biofactors could provide prophylactic potential for these diseases. The polyphenolic composition and the antioxidant properties of organic extracts (acetone/methanol) of Mauritian commercial black teas were evaluated. HPLC data of the individual compounds revealed remarkably high levels (+)-Catechin ((+)-C), (-)-epicatechin ((-)-EC), (-)-epicatechin 3-gallate ((-)-ECG), (-)-epigallocatechin ((-)-EGC), (-)-epigallocatechin 3-gallate ((-)-EGCG) and gallic acid. Analysis of hydrolysed extracts indicated that quercetin was the dominant flavonol aglycone with traces of myricetin and kaempferol. Based on the Ferric Reducing Antioxidant Power (FRAP) and the Trolox Equivalent Antioxidant Capacity (TEAC) assays Extra tea from Bois Chéri exhibited the highest antioxidant potential. Linear regression analyses showed that the antioxidant capacities of the organic extracts are strongly influenced by total phenols (TEAC: r=0.95 and FRAP: r=0.96) and to a lesser extent by total proanthocyanidin and total flavonoid contents. Catechins and gallic acid seem to add up to the overall antioxidant capacity of black tea extracts. The fresh tea leaves had high levels of total phenols, total flavonoids, total proanthocyanidin and exhibited greater antioxidant potential when compared with black teas. Organic extracts of endemic teas represent useful source of phenolic antioxidants supplements for prophylactic use. SN - 0951-6433 UR - https://www.unboundmedicine.com/medline/citation/17012766/Assessment_of_the_polyphenolic_composition_of_the_organic_extracts_of_Mauritian_black_teas:_a_potential_contributor_to_their_antioxidant_functions_ L2 - https://content.iospress.com/openurl?genre=article&issn=0951-6433&volume=27&issue=1-4&spage=79 DB - PRIME DP - Unbound Medicine ER -