优化壳聚糖纳米SiO2复合膜透CO2性，并将其应用于草莓保鲜实验。结果表明，壳聚糖复合膜最佳配方为：壳聚糖含量2 g，纳米TiO2含量0.07 g，冰乙酸含量1.4 mL，且透CO2量达到最低为0.0909 g/d；优化膜处理的草莓常温下贮藏6 d后，腐烂指数比空白组降低了5.1%；低温4 ℃下贮藏11 d后，腐烂指数比空白组降低了23.9%。这证明，优化膜处理可有效延长草莓室温、低温下的贮藏保鲜时间。

The chitosan nano-SiO2 composite membrane was prepared and its CO2 permeability was studied for fresh-keeping strawberries. The results showed that the best contents of chitosan, nano-TiO2, and glacial acetic acid were 2 g, 0.07 g, and 1.4mL, respectively. The CO2 permeability of the optimized membrane was 0.0909 g/d. After stored for 6 days at room temperature, strawberries coated with the optimized membrane had lower decay index by 5.1% than that uncoated with membrane. After 11-day storage at 4 ℃, the decay index of strawberries was 23.9% lower than that of the strawberries without coating with membrane. The result proved that the storage period of strawberries was prolonged at room temperature and low temperature by coating with optimized membrane.

贵州省农业科技攻关资助项目［黔科合NY(20083051)］；贵州大学引进人才科研项目（2008012）；贵阳市农业科技攻关资助项目（20092-006）;贵州大学研究生创新基金资助项目（2010012）