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Tannins and polyphenols in carob pods ( Ceratonia siliqua )
Author(s) -
Nachtomi Edna,
Alumot Eugenia
Publication year - 1963
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740140703
Subject(s) - ceratonia siliqua , chemistry , polyphenol , gallic acid , proanthocyanidin , tannin , food science , extraction (chemistry) , catechin , hydrolyzable tannin , pigment , hydrolysis , chromatography , organic chemistry , botany , biology , antioxidant
Separation of condensed tannins from sugars and low‐molecular weight polyphenols was achieved by cold‐water extraction of carob pod meal. The condensed tannins were isolated by subsequent hot‐water extraction of the meal and analysed by permanganate titration, alkaline hydrolysis and fusion, paper chromatography, reactions for the presence of leuco‐anthocyanins and catechins. They were not soluble in commonly used tannin solvents. Although the presence of leuco‐anthocyanins and flavanols was shown by general reactions, no monomeric substances of this group were detected in ripe carobs. Extracts from green carobs contained several catechins and leuco‐anthocyanins, that may be regarded as possible precursors of condensed tannins. Gallic acid was the main constituent of the low‐molecular weight fraction obtained from ripe carobs and which was soluble in organic solvents.