壳聚糖涂膜对鲜切苹果贮藏品质的影响

为研究壳聚糖涂膜对鲜切苹果贮藏品质的影响，将鲜切寒富苹果分别用质量分数0.5%、1.0%、1.5%的壳聚糖浸泡3 min后沥干，用0.11 mm厚度的PE保鲜膜包装后置于4 ℃冷库中贮藏，每2 d测定与成熟衰老相关的生理生化指标。结果表明，适当质量分数的壳聚糖涂膜可保持苹果切块的感官品质、延缓营养物质下降、抑制微生物的繁殖，对鲜切苹果有较好的护色效果；壳聚糖涂膜也能较好地抑制多酚氧化酶活性，提高过氧化物酶活性。在研究的3 种质量分数中，1.0%壳聚糖处理对鲜切苹果的保鲜效果最好，能在4 ℃冷库12 d贮藏期中维持鲜切苹果的较好品质。

Effect of Chitosan Treatment on Quality of Fresh-cut Apple during Cold Storage

This study aimed to determine the effect of chitosan treatment on the quality of fresh-cut ‘Hanfu’ apple during
storage. Fresh-cut apple slices were wrapped with 0.11 mm thick PE film and then stored at 4 ℃ after dipping in 0.5%,
1.0% and 1.5% chitosan solution for 3 min, respectively. Indexes related to maturity and aging were measured every 2 days
during the storage period. The results indicate that appropriate chitosan treatment maintained the sensory quality, inhibited
nutritional loss, reduced microbial levels, suppressed polyphenol oxidase activity and increased peroxidase activity in the
fresh-cut apple slices. Among the concentrations investigated, 1.0% chitosan exerted the best preservative effect on fresh-cut
apple slices stored at 4 ℃ for 12 days.