Studies On Dynamic Change Of Major Nutrient Components In Pumpkin During The Development Of Fruit

Pumpkin belongs of annual herbaceous of cucurbitaceous. The Cucurbita mainly includes three cultivated species: C. moschata Duch(cv wogua), C. pepo L(cv jinhulu), C. maxima Duch. (cv mili).The paper analysed the total carotene, pectin, the pectolytic enzyme activity and carbohydrate content of three pumpkin varieties.The results showed that: The total carotene content of three pumpkin varieties fruit was from 1065.00 to10718.00±86.76μg/100gFW in 56 days after pollination, and that of C. maxima Duch(cv mili) was the highest among three species. The WAP, OSP and ASP content of the C. maxima Duch (cv mili) fruit were the highest among three species in growth period and up to 47.98±0.80 mg/100g FW in the 49 days after pollination. In 56 days after pollination, the reducing sugar and total sugar content of the C.pepo L. (cv jinhulu) fruit were the highest,the surcose content of the C. maxima Duch(cv mili) fruit was the highest; the starch of the C. moschata Duch(cv wogua) fruit was the highest.Amylose content of the C. moschata Duch (cv wogua)fruit was up to 57981.03mg/kgFW, and was the highest in three species. During the development nutrient contents of pumpkin fruit was analysised.C. maxima Duch. (cv mili) of picking time was about 49d, C. moschata Duch (cv wogua) of plucking time was about 56d, C. pepo L(cv jinhulu) of plucking time was about 35d. Under storage at room temperature, nutrient contents of C. maxima Duch(cv mili) fruit was analysised.The resuilts showed that fruit had better to be edible within 40 days after harvest in order to keep nutritive value.The pumpkin frui had fewer loss of nutritive composition when processed by microwave oven, compared with boiling processing.