Effect of UV- C irradiation on quality and microbial characteristics of Agaricus bisporus
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摘要: 本文以双孢蘑菇为材料,研究了不同剂量的短波紫外线（UV-C）对双孢蘑菇低温贮藏期间的失重率、硬度、颜色、可溶性固形物含量、细胞膜透性、PPO活力和微生物的影响。双孢蘑菇子实体先用0、0.3、0.6、0.9、1.2 k J/m2剂量的UV-C处理,随后放入4℃冷库存放16 d。结果表明:适当的短波辐照（0.6 k J/m2）处理可以抑制细胞膜透性的增加,延缓可溶性固形物含量的降低,在一定程度上延缓软化和褐变。对嗜冷菌、大肠杆菌、酵母和霉菌有显著性抑制作用。较大剂量（0.9、1.2 k J/m2）会对双孢蘑菇的表皮细胞产生伤害,使得细胞膜透性增加,导致可溶性固形物含量的降低,失重率增加以及褐变的加剧。Abstract: The effects of different doses of UV- C irradiation( 0,0.3,0.6,0.9,1.2 k J / m2) on physicochemical responses and microbial characteristics on the storage of Agaricus bisporus under low temperature( 4 ℃) were studied.Mushroom weight loss,firmness,color,total soluble solids,activities of polyphenol oxidase( PPO) and microbial were measured.The results showed that UV- C treatment in 0.6 k J / m2 could disinfect microorganism in a certain extent,minish membrane permeability,inhibit PPO activity and delay browning,but no significant difference.The more obvious effects of reduction in microbial counts compared with the control could be found with elongation of UV- C irradiation.The high doses of UV- C treatment could delay the changes in firmness and total soluble solids.But at the same time,damages such as browning and membrane permeability enhancement would be stronger.
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Keywords:
- Ultraviolet treatment /
- postharvest physiology /
- Agaricus bisporus
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