不同保鲜膜对平菇保鲜效果的影响

为比较不同保鲜膜对平菇保鲜效果的影响，分别以低密度聚乙烯(LDPE)膜、高密度聚乙烯(HDPE)膜和聚氯乙烯(PVC)膜为包装材料，在模拟超市冷鲜货架温湿度条件温度约(14±1)℃，贮藏环境相对湿度约85%]下，研究3种不同保鲜膜对平菇的保鲜效果。结果表明：与LDPE膜相比，HDPE 膜和PVC 膜能降低平菇的采后失重率，维持包装内较高的CO₂体积分数和较低的O₂体积分数；在贮藏的前4天，HDPE膜和PVC膜包装的平菇感官分值与LDPE膜包装平菇无显著差异(P>0.05)；但贮藏4天后，HDPE 膜和PVC膜包装的平菇其感官分值明显低于LDPE膜，且呼吸强度及细胞膜透性也显著高于LDPE膜(P<0.05)。3种不同保鲜膜以LDPE膜对平菇的保鲜效果最佳。

Effects of Different Kinds of Cling Film on Pleurotus ostreatus Fresh-keeping

The aim of the present study is to compare the effect of three different kinds of cling film, including low density polyethylene (LDPE) film, high density polyethylene (HDPE) film and polyvinyl chloride (PVC) film, on Pleurotus ostreatus fresh-keeping under the condition of simulated cold fresh supermarket shelf temperature and humidity temperature around (14±1)℃, storage environment relative humidity around 85%]. The results showed that compared with the LDPE film, HDPE film and PVC film could reduce the postharvest Pleurotus ostreatus weight loss, maintain the high CO₂ volume fraction and low O₂ volume fraction in packing. During the first 4 d of storage, Pleurotus ostreatus packaged by HDPE film and PVC film had no significant difference with Pleurotus ostreatus packaged by LDPE film(P>0.05). But after 4 d storage, the sensory score of Pleurotus ostreatus packaged by HDPE film and PVC film was significantly lower than the sensory score of Pleurotus ostreatus packaged by LDPE film and the respiration intensity and cell membrane permeability were also significantly higher than Pleurotus ostreatus packaged by LDPE film (P<0.05). Under the condition of Pleurotus ostreatus packaged by LDPE, the fresh-keeping effect was the best.