| China has abundant resources of sweet potato with the biggest production in the world. Sweet potato is a good raw material in food industry, which has high output, wide adaptability, strong adversity and regeneration ability, rich nutrient and some medical value. The functional ingredients of DHEA,β-carotin and glycoprotein from sweet potato were studied in this paper, and the preliminary assessment to the sweet potato quality was also conducted according to three kinds of functional components content in different cultivars.1. The research ofβ- carotene in sweet potatoThe extraction technique ofβ-carotin with ultrasonic auxiliary in sweet potato was studied in this paper. The results indicated that the procedure was optimal to extractβ-carotin with ultrasonic auxiliary when extracted in room temperature and used acetone-petroleum ether as solvents with the ratio of 3 to 7, then extracted 20 min for 3 times with the 1 to 4 proportion of material and solvent. The above way ofβ-carotin extraction with ultrasonic auxiliary was superior to that of general saturation, for which has heat sensitivity and photosensitivity. Therefore, the process with ultrasonic auxiliary cost less solvent and time and was showed to be a feasible way to extractβ-carotin. The significant differences in the cultivars were observed through the analysis of the contents ofβ- carotin according to the six different species of sweet potato. It provides some information for choosing the cultivars from sweet potato, and brings a new way of further processing to sweet potato.2. The research of glycoprotein in sweet potatoThe technique of the purification was studied in the paper about the active constituent glycoprotein in sweet potato. The results indicated that the best purification parameter of glycoprotein in the sweet potato with extraction in water under the room temperature, the 1 to 6 ratio of material to water, extracted for 1 hour and 3 times, and then the supernatant precipitated by...
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