Astringent tannins of the leaves of Geranium species

Fifty per cent methanolic extracts of the leaves of 70 species (including some subspecies, varieties and one hybrid) of Geratiium have been analysed for proanthoeyanidins, total galloyl esters, hexahydroxydiphenoylglucose and astringency. Proanthoeyanidins are present in most species (prodelphinidin...

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Published inPhytochemistry (Oxford) Vol. 20; no. 2; pp. 211 - 216
Main Author Bate-smith, E.C.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 1981
Subjects
astringency
chromosome numbers
citagitannins
gallotannins
galloyl esters
geography
Geraniaccae
geraniin
Geranium
leaves
plant biochemistry
plant physiology
proanthocyanidins
taxonomy
galloyl esters
proanthocyanidins
leaves
gallotannins
chromosome numbers
geography
citagitannins
Geranium
taxonomy
geraniin
astringency
Geraniaccae
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Summary:Fifty per cent methanolic extracts of the leaves of 70 species (including some subspecies, varieties and one hybrid) of Geratiium have been analysed for proanthoeyanidins, total galloyl esters, hexahydroxydiphenoylglucose and astringency. Proanthoeyanidins are present in most species (prodelphinidin in four) but only rarely in considerable quantities and then not readily extracted. A reaction with potassium iodate characteristic of geraniin (a derivative of dihexahydroxydiphenoylglucose) is given by most species. The very considerable differences in astringency between species cannot at present be accounted for in terms of chemical differences, but a systematic review suggests that geographical location, chromosome number and annual or biennial habit are involved in the amount ofiannin present in particular species.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0031-9422
1873-3700
DOI:10.1016/0031-9422(81)85095-9