壳聚糖/纳米SiOx复合膜对艳红桃的保鲜研究

摘要

After receiving dipping treatment with composite chitosan/nano-SiOx solution (CTSS) for 30, Yanhong peach fruits were stored under the conditions of 26-29℃and relative humidity of 65%-75%. The dehydration rate of the fruits were optimized with U10(102×52) uniform design and L9(34) orthogonal array design. The results indicated that the optimal ingredients in 300 mL solution included chitosan 5.0 g, glycerol monostearate 0.11 g, nano-SiOx 0.07 g, and glycerin 6.0 g. Coating treatment with CTSS revealed the best fresh-keeping effect at the end of the storage period for 20 days. The dehydration rate and the decay index in CTSS group revealed the reduction by 43.96%and 30.56%, while reducing sugar, ascorbic acid and titrable acidity increased by 44.00%, 66.87%and 52.77%, respectively, when compared with those in the control group. These results suggest that CTSS coating can signiifcantly improve the quality of post-harvest fruits and extend the shelf life of Yanhong peach.%以艳红桃为试材，在室温26～29℃，相对湿度65%～75%条件下，采用均匀试验U10(102×52)与L9(34)正交试验设计联用，研究壳聚糖/纳米SiOx复合对艳红桃品质变化的影响。结果表明：300mL保鲜剂中，壳聚糖5.0g、单甘酯0.11g、改性纳米SiOx 0.07g、甘油6.0g、艳红桃浸泡30s，壳聚糖/纳米SiOx处理与空白和壳聚糖处理相比，艳红桃贮藏20d后，失水率分别降低了43.96%和27.41%，还原糖含量分别提高了44.00%和18.26%，VC含量分别提高了66.87%和4.80%，总酸含量分别提高了52.77%和39.76%；腐烂指数分别降低了30.56%、24.24%。表明壳聚糖/纳米 SiOx复合膜提高了艳红桃品质，延长了贮藏保鲜期。