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Titre du document / Document title

Vanillin-HCl method for condensed tannins : effect of organic solvents used for extraction of tannins

Auteur(s) / Author(s)

MAKKAR H. P. S. ; BECKER K. ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

Univ. Hohenheim, inst. animal production tropics subtropics, 7000 Stuttgart, ALLEMAGNE

Résumé / Abstract

Tannins are generally extracted using aqueous organic solvents, mainly methanol and acetone. The presence of various concentrations of methanol in the sample containing catechin or tannins did not alter the kinetics of their reaction, but the absorbance depended on the amount of methanol in the sample; the higher the methanol, the higher was the absorbance. Acetone reacted with acidified vanillin to produce a chromogen with λmax at 548 nm, which produce a substantial error in the determination of condensed tannins. In the presence of acetone, the time courses of the reaction for catechin and tannins were different, which depended on the acetone concentration and the reaction temperature

Revue / Journal Title

Journal of chemical ecology    ISSN  0098-0331   CODEN JCECD8 

Source / Source

1993, vol. 19, no4, pp. 613-621 (8 ref.)

Langue / Language

Anglais

Editeur / Publisher

Springer, New York, NY, ETATS-UNIS  (1975) (Revue)

Mots-clés anglais / English Keywords

Vegetal tannin

;

Analytical method

;

Vanillin

;

Spectrophotometry

;

Extraction

;

Solvent

;

Methanol

;

Acetone

;

Mots-clés français / French Keywords

Tanin végétal

;

Méthode analytique

;

Vanilline

;

Spectrophotométrie

;

Extraction

;

Solvant

;

Méthanol

;

Acétone

;

Catéchine

;

Mots-clés espagnols / Spanish Keywords

Tanino vegetal

;

Método analítico

;

Vainillina

;

Espectrofotometría

;

Extracción

;

Solvente

;

Metanol

;

Acetona

;

Localisation / Location

INIST-CNRS, Cote INIST : 17087, 35400003789576.0020

Nº notice refdoc (ud4) : 4788327



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