Abstract:

Effects of irradiation-degradated chiotosan of different molecular weight on weight loss,rotting rate,total acid,soluble solid content,and ascorbic acid in Shatang mandarin,Fortunella margarita(lour) Swingle,and Lycopersicon esculentum Mill.var.cerasiforme Alef during storage were investigated.The result showed that,compared to control,all chitosan treatment could significantly reduce weight loss and rotting rate,and maintain the content of total acid,soluble solid,and ascorbic acid.After 18 days of storage,treatment of chitosan with molecular weight of 6.6×10~4 Da showed the highest capability of decreasing the rotting rate in S.mandarin,F.margarita,L.esculentum by 71.11%,66.01% and 70.22%,respectively;increasing total acid by 55.60%,36.75%and 36.68%,soluble solid content by 49.06%,25.75% and 49.46%,and ascorbic acid by 42.80%,41.65% and 51.70%,respectively.Accordingly,irradiation-degradated chitosan coating could effectively prevent the rotting rate and preserve the quality of the three kinds of fruit during storage and thus prolong their shelf life to 18 days.

Key words: Shatang mandarin, Fortunella margarita (lour) Swingle, Lycopersicon esculentum Mill . Va. cerasiforme Alef, chitosan ;storage quality ;shelf life

摘要：

研究了经辐照降解后的不同分子量壳聚糖对沙糖桔、圣女果、金桔在贮存过程中失重率、腐烂率、总酸、可溶性固形物以及抗坏血酸的影响。结果表明:降解壳聚糖处理可显著降低3种果实的失重率和腐烂率,延缓总酸、可溶性固形物以及抗坏血酸含量的下降;其中,分子量为6.6×104Da的壳聚糖对3种水果的保鲜效果最佳,贮存18d的腐烂率较对照组分别降低71.11%、66.01%和70.22%,总酸提高55.60%3、6.75%和36.68%,可溶性固形物提高49.06%、25.75%和49.46%,抗坏血酸提高42.80%、41.65%和51.70%。因此,辐照降解壳聚糖能有效降低3种水果的腐烂率,延长贮存期至18d,并保持其营养品质。

关键词: 沙糖桔;;圣女果;;金桔;;壳聚糖;;品质;;贮存期