Abstract
The water extract of the roots of Rehmannia glutinosa LIBOS. forma hueichingensis HSIAO was fractionated by the chromatographies on two types of ion-exchange resin. Fifteen amino acids and D-glucosamine were found and determined in the basic fraction. Phosphoric acid was detected and estimated as a component of the acidic fraction. Neutral fraction, the main fraction of the water extract, was mostly constituted with carbohydrates. D-Glucose, D-galactose, D-fructose, sucrose, raffinose, manninotriose, stachyose, verbascose and D-mannitol were identified and determined. It was found that stachyose is the main component of the water extract and the yield of the substance was 48.3% from the dried material.
