中文摘要：

为了探究纳米SiOx对壳聚糖复合膜透氧和透湿的影响，采用共混法制备了不同纳米SiOx添加量的壳聚糖复合膜，并用红外（IR）和透射电镜（TEM）对复合膜的结构进行表征，同时考察复合膜中不同添加量的纳米SiOx对坼猴桃呼吸强度和失重率的影响。结果表明，当纳米SiOx添加量分别为O01、0．03、O05g．d00mL）-1时，纳米SiOx／壳聚糖复合膜的02透过系数分别为32.61、24.89、31．48mg．cm^-2．d^-1，水蒸气透过系数分别为91.68、73.62、85.35mg．cm^-2．d^-1。特别是当纳米SiOx添加量为O.03g·（100mL）^-1时，纳米SiOx／壳聚糖复合膜的O：透过系数及水蒸气透过系数达到最低，分别较壳聚糖单膜降低了34.40％和22.85％，猕猴桃呼吸高峰延迟了7d。实验结果证实通过控制纳米SiOx的添加量，可以调节复合膜的透氧量和透水量，并能有效抑制采后呼吸，提高猕猴桃的保鲜效果。

英文摘要：

In order to investigate the effects of nano-SiOx on oxygen permeability （OP） and water vapor permeability （WVP） of chitosan composite films, a series of chitosan composite films were prepared by blending chitosan with various concentrations of nano-SiOx, and their structure was characterized by infrared spectrum （IR） and transmission electron microscopy （TEM）. The respiration rate and weight loss of Kiwifruits were also determined to evaluate the preservation capacity of the composite films containing different concentrations of nano-SiO,. The experimental results show that the amount of nano-SiOx can change the OP and WVP of the composite films. Chitosan/nano-SiO, composite films with OP of 32.61 mg.cm^-2.d1, 24.89 mg.cm^-2.d^-1, 31.48 mg.cm^-2.d^-1, and WVP of 91.68 mg.cm^-2.d^-1, 73.62 mg.cm^-2.d^-1, 85.35 mg.cm^-2.d^-1 can be obtained under 0.01 g.（100 mL）^- 1, 0.03 g.（100 mL）^- 1 and 0.05 g.（100 mL）^- 1 nano-SiOx, respectively. Moreover, the values of OP and WVP are the lowest when 0.03 g.（100 mL）^- 1 nano-SiOx is added into the composite films, which is decreased by 34.40% and 22.85% respectively in comparison with pure chitosan films. The above composite film was employed to Kiwifruits preservation, and the data shows that the respiratory peak of the fruits is delayed by 7 days. These evidences confirm that the OP and WVP of chitosan/nano-SiO, composite films can be regulated through controlling the amount of nano-SiOx, and the resulting composite films can inhibit respiration rate of the post-harvest fruits.