目的 探讨在常温（20 ℃）下， 不同压力条件对香菇减压贮藏效果的影响。 方法 以常压，（80±5），（55± 5），（30± 5） kPa等不同压力处理香菇， 评定其呼吸强度、失重率、可溶性固形物含量、硬度、相对电导率和多酚氧化酶（PPO）活性等。 结果 减压贮藏能抑制贮藏初期香菇的呼吸强度（ P<0.05），并将香菇的呼吸高峰延迟至第 8 天； 减压贮藏能减缓可溶性固形物含量的变化， 减少硬度的下降， 降低细胞膜的透性（ P<0.05）； 减压贮藏压力越低， 对香菇 PPO 活性的抑制作用越强（ P<0.05）， 与其他处理组相比，（30± 5） kPa 处理组在第 10天时 PPO 活性达到最低， 为 7.43 U。 结论 减压贮藏在一定程度上能导致香菇的失重率升高， 其中（55± 5） kPa减压贮藏压力下香菇的可溶性固形物含量、硬度、相对电导率等 3 个方面效果较佳。

Objective To investigate the effect of different pressure conditions on the hypobaric storage of shiitake mushrooms at 20℃ . Methods The Pressures of the packaged shiitake mushrooms were controlled at（80±5），（55±5） and （30±5） kPa, respectively, and air storage was used as control. Respiratory intensity, weight loss rate, soluble solids content, firmness, relative conductivity, and PPO activities were determined every two days. Results The results showed that hypobaric storage could significantly reduce the respiration intensity of shiitake mushrooms during early storage ( P<0.05) and delay the emergence of respiratory peak to the 8th day. What’ s more, it could effectively slow down the increase and decrease of soluble solids content, reduce the decrease of firmness and slow down the permeability of cell membrane ( P< 0.05); and the lower the storage pressure was, the lower the PPO activities of shiitake mushrooms were ( P<0.05). By comparison, the PPO activity of shiitake mushrooms under（30±5） kPa hypobaric storage pressure was 7.43 U, which was the lowest. Conclusion The hypobaric storage led to the increase of weight loss rate of shiitake mushrooms to some extent. Overall, the soluble solids content, firmness and relative conductivity of shiitake mushrooms under（55±5） kPa hypobaric storage pressure were best.