壳聚糖涂膜保鲜圆脆红枣

Fresh-keeping Effect of Chitosan Coating on Zizyphus jujuba Mill Fruits

以圆脆红枣为试材,在贮藏条件为温度-1～0℃、相对湿度90%～95%条件下,探讨不同质量分数(0.50%、1.00%、1.50%、2.00%、2.50%)壳聚糖涂膜处理圆脆红枣的保鲜效果。经70d的贮藏,结果表明:1.50%壳聚糖涂膜处理保鲜效果最显著,其果实腐烂率低,为30.60%;质量损失小,质量损失率11.35%;果品贮运性能好,硬度为9.88kg/cm2;营养成分损失较小,其中可滴定酸含量为0.31%;VC含量为412.56mg/100g;可溶性固形物含量为22.22%。而空白对照组的腐烂率高达92%,已完全丧失果品商品价值,表明壳聚糖涂膜保鲜可以明显延缓圆脆红枣采后的衰老,能有效延长圆脆红枣的保藏期。

After receiving coating treatment with different concentrations （0.50%, 1.00%, 1.50%, 2.00% and 2.50%） of chitosan solutions, round crisp dates （Zizyphusjujuba Mill fruits） were stored under the conditions of - 1 ℃-0 ℃ and 90%-95% relative humidity for 70 days, and changes in the sensory, physical and chemical characteristics of round crisp dates were measured during the storage period. Coating treatment with 1.50% chitosan solution revealed the best fresh-keeping effect on round crisp dates, and the percentage of rotten fruits, fruit weight loss rate, firmness and the contents of titratable acid, vitamin C and soluble solid at the end of the storage period were 30.60%, 11.35%, 9.88 kg/cm^2, 0.31%, 412.56% and 22.22%, respectively. The control group without receiving any fresh-keeping treatment, however, showed 92% of rotten fruits and completely lost commercial value. These data suggest that chritosan coating can noticeably retard post-harvest fruit senescence and extend the shelf life of round crisp dates.