壳聚糖/纳米TiO<sub>2</sub>复合涂膜对芒果保鲜效果的影响

壳聚糖/纳米TiO₂复合涂膜对芒果保鲜效果的影响

摘要: 研究用壳聚糖单一涂膜及壳聚糖/纳米TiO₂复合涂膜对芒果保鲜效果的影响,并对不同纳米TiO₂添加量的复合膜进行微观形态观察。结果表明,当壳聚糖/纳米TiO₂复合膜中壳聚糖质量分数为1%,纳米TiO₂质量分数为0.03%时,涂膜处理可以保持芒果果实硬度、V_C及可滴定酸含量,延缓果胶的降解速度,保持细胞膜的功能活性。在贮藏第20 d时,芒果转黄指数为58.16%,失重率为6.72%,说明壳聚糖/纳米TiO₂复合涂膜对芒果在13 ℃贮藏条件下起到了较好的保鲜作用。

Abstract: The effect of chitosan single-membrane treatment and chitosan/nano-TiO₂composite coating on the preservation of mango was studied. Micromorphological observation of composite membranes with different amounts of nano-TiO₂ was observed. The results showed that,when mass fraction of chitosan was 1% and nano-TiO₂ content was 0.03% in the chitosan/nano-TiO₂ composite film,the coating treatment could maintain mango fruit hardness,V_C and titratable acid content,delay down the degradation speed of pectin,and maintain cell membrane functionality well. On the 20th day of storage,the yellow index of mango was 58.16%,and the weight loss rate was 6.72%. It was indicated that the chitosan/nano-TiO₂ composite coating had a better preservation effect on mango under 13 ℃ storage conditions.