壳聚糖涂膜减轻黄瓜冷害的研究

Study on Reducing Chilling Injury of Cucumber by Chitosan Coating

试验研究了在3℃环境下、不同浓度的壳聚糖醋酸溶液涂膜处理对黄瓜果实采后贮藏期间冷害的发生、贮藏品质的变化及生理生化指标动态的影响。结果表明,低温下采用壳聚糖涂膜处理可有效地延迟黄瓜冷害出现的时间,并能减轻冷害症状、降低果实采后的呼吸强度、延缓果皮叶绿素的降解、抑制细胞膜透性的上升、减缓果实内丙二醛的积累、使果实内过氧化氢酶和过氧化物酶的活性维持在较高的水平,其中以1.00%浓度的壳聚糖醋酸溶液涂膜处理的改善黄瓜在低温下的贮藏品质效果最佳。

The effects of chitosan acetic acid solution coating treatment on incurrence of chilling injury,quality change and physiological and dynamics of biochemical indexes of cucumber（Cucumis sativus L.） during postharvest storage at 3 ℃ were studied.The results showed that chitosan coating could effectively delay the occurrence of chilling injury,alleviate the injury symptoms,depress the intensity of postharvest respiration,delay the degradation of chlorophyll in seedcase,inhibit the permeability increase of cell membrane,slow down the accumulation of MDA and inspire CAT and POD enzyme activity in fruit.1.00% chitosan acetic acid solution coating had the best quality improving effect for cucumber under low temperature storage.