壳聚糖涂膜保鲜圆脆红枣-食品科学.pdf

280 2011, Vol. 32, No. 02 食品科学 ※包装贮运 李述刚，陈冬梅，刘华英，侯旭杰，于 军 * (塔里木大学生命科学学院，新疆特色农畜产品加工重点实验室，新疆 阿拉尔 843300) 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。 圆脆红枣；壳聚糖；涂膜；保鲜 Fresh-keeping Effect of Chitosan Coating on Zizyphus jujuba Mill Fruits LI Shu-gang ，CHEN Dong-mei ，LIU Hua-ying ，HOU Xu-jie ，YU Jun* (Xinjiang Key Laboratory of Featured Agricultural and Livestock Products, College of Life Sciences, Tarim University, Alar 843300, China) Abstract：After receiving coating treatment with different concentrations (0.50%, 1.00%, 1.50%, 2.00% and 2.50%) of chitosan solutions, round crisp dates (Zizyphus jujuba 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/cm2, 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 noticeabl