Sugar Constituents of Jalapin from Sweet Potato Tubers

[摘要] Jalapin purified from the tubers of the sweet potato (Ipomoea batatas) was deacylated and subjected to structural elucidation. Complete and degraded acid hydrolyses indicated the presence of L-rhamnose, D-fucose and D-glucose in the molar ratio of 1: 1: 1 and in the increasing order of acid-stability. While two moles of periodate were consumed per mole of the product, D-glucose survived in the oxidation. The following structure was, therefore, proposed tentatively for the deacylated jalapin: L-Rhaf-(1¡æ4)-D-Fucp-(1¡æ3)-D-Glup-(1¡æ11)-jalapinolic acid.

[学科分类] 化学（综合）