ANTHOCYANIN PIGMENTS IN Dioscorea tryphida L.

摘要

ABSTRACTThe anthocyanin pigments responsible for the violet color of the tropical tuberDioscorea tryphidawas investigated. The pigments were extracted with 0.1 HCI in methanol, purified with Dowex 50W × 4 cation exchange resin in the hydrogen form and further purified by paper chromatography. The identification of the pigments was based on Rfvalues in different solvents, partial acid hydrolysis, sugar moiety, alkaline degradation, fluorescence under ultraviolet radiation, color reactions and absorption spectra in the visisble and ultraviolet regions. The pigments were identified as follow: peonidin 3,5‐diglucoside, malvidin 3,5‐diglucoside and malvidin 3,5‐diglucoside‐feru