College of Food Science and Nutritional Engineering, China Agricultural University, China.
Food Sci Technol Int. 2012 Apr;18(2):123-8. doi: 10.1177/1082013211414774. Epub 2012 Mar 13.
Yali pears (Pyrus bretschneideri Rehd.) are susceptible to mechanical damage. In this study, the protective effects of chitosan treatments on the quality of bruised pears were evaluated. The fruit were treated with 1.5% chitosan before or after bruise damage, respectively. Then, the fruit were stored at 16 °C and 85-90% relative humidity. Postharvest quality parameters were analyzed during the storage. Bruise damage accelerated the decrease of firmness and the ratio of sugar to acid, while a delay of firmness and sugar-to-acid ratio in those pears treated with chitosan before or after was found. Meanwhile, chitosan treatments both before and after damage delayed the color changes caused by damage, inhibited disease incidence increase, and enhanced the bruise recovery during the storage. Our results suggested that chitosan treatment could be used to control the physiological responses induced by bruise damage.
鸭梨（Pyrus bretschneideri Rehd.）易受机械损伤。本研究评价了壳聚糖处理对碰伤鸭梨品质的保护作用。果实分别用 1.5%壳聚糖处理后或碰伤后。然后，将果实储存在 16°C 和 85-90%相对湿度下。在贮藏过程中分析了采后品质参数。碰伤加速了硬度和糖酸比的降低，而用壳聚糖处理前后的硬度和糖酸比则有所延迟。同时，碰伤前后的壳聚糖处理均延迟了损伤引起的颜色变化，抑制了发病率的增加，并在贮藏过程中促进了碰伤的恢复。我们的结果表明，壳聚糖处理可用于控制由碰伤引起的生理反应。
