Polyphenols from Ziziphus lotus grown in Tunesia

Abstract EN

Four monomeric and four oligomeric flavanoids have been identified from the root bark of Ziziphus lotus traditionally used for the treatment of diabetes in Tunisian traditional medicine.

Flavan-3-oles are (-)- epicatechin (1), (+)-catechin (2), ()-epigallocatechin (3) and (+)- gallocatechin $); proanthocyanidins are epicatechin-(4??8)-catechin (procyanidin B-1, 5), catechin-(4??8)-catechin (procyanidin B-3, 6), catechin-( 4??8)-epicatechin (procyanidin B-4, 7) and gallocatechin-(a??8)- gallocatechin (prodelphinidin B-3, 8) were isolated.

The reported compounds were established as their peracetate derivatives, on the basis of their chemical and spectral evidences.

The spectral data of the peracetate derivative of the prodelphinidin (8a) are reported.