纳米SiO_x对壳聚糖膜CO_2透气性的影响

Effects of Nano-SiOx Content on CO_2 Permeability Property of Chitosan Composite Membrane

制备了不同纳米SiOx添加量的纳米SiOx/壳聚糖复合膜,研究纳米SiOx对复合膜CO2透气性能的影响,并且以"米良1号"猕猴桃为试材,在室温20～22℃,相对湿度63%～70%条件下,研究纳米SiOx添加量对猕猴桃呼吸作用以及对还原糖和总酸含量的影响。结果表明:纳米SiOx添加量为0.03 g/100 mL时,膜的CO2透过系数比对照降低了67.30%,猕猴桃呼吸高峰出现在第13天,比对照延迟了7天,并可有效地保持还原糖和总酸含量,说明该处理对猕猴桃的成熟衰老有明显的抑制作用。

Different amounts of nano-SiOx were added into chitosan composite membranes. The CO2 permeability property of these composite membranes were measured. Results showed that when the content of nano-SiOx of the composite films was 0.03 g/100mL,CO2 permeability property of the chitosan composite membranes was reduced by 67.30 % compared to the pure chitosan membranes. The diverse composite nano-SiOx/chitosan solutions were pre- pared. After receiving coating treatment with the solutions, Kiwifruits（ Miliang NO. 1 ） were stored under 63% ~ 70% relative humidity at 20 - 22℃. The respiration, reducing sugar and titrable acidity were evaluated during the stor- age. When 0.03 g/100mL nano-SiOx were added and coated on the fruits, breathing peak appeared on the 13 day, which was 7 days delay compared to the no nano-SiOx of chitosan membranes. Reducing sugar and titrable acidity were significantly maintained. These results provided important information regarding the ripening physiology of ki- wifruit and indicated that the storage life of fresh fruit was extended by edible coatings containing nano-SiOx.