A study of polyphenols in the seeds and leaves of guar (Cyamopsis tetragonoloba L. Taub)

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Abstract
Gallotannins, gallic acid, gallic acid derivatives, myricetin‐7‐glucoside‐3‐glycoside, kaempferol‐7‐glucoside‐3‐glycoside, kaempferol‐3‐rutinoside, kaempferol‐3‐glucoside, chlorogenic acid, caffeic acid and ellagic acid were derived from guar seeds and identified by chromatographic and spectral analysis. Myricetin‐7‐glucoside‐3‐glycoside, kaempferol‐7‐glucoside‐3‐glycoside, kaempferol‐3‐rutinoside, kaempferol‐3‐glucoside, quercetin‐3‐rutinoside, 2,3,4‐trihydroxybenzoic acid, texasin‐7‐O‐glucoside, daidzein‐7‐O‐glucoside, chlorogenic acid and p‐coumaryl quinic acid were found in guar leaves. The polyphenolic content of guar seeds depended on the stage of maturity varying from 1.26 to 0.69% total phenols; 0.49 to 0.12% gallic acid; 0.5 to 0.21% gallotannins; and 0.13 to 0.23% flavonols (all as percentage dry matter). The polyphenolic content of guar leaves varied from 0.74 to 1.24% total phenols; 0.18 to 0.84% flavonols; and 0.05 to 0.24% hydroxycinnamic acids in the dry matter of guar leaves.