低氧气调包装对去壳雷笋褐变和木质化的影响

研究了在厚度为0.04 mm的聚乙烯(PE)袋内充气成分为2%O2、5%CO2和93%N2于10℃下贮藏时气调袋装去壳雷笋褐变和木质化进程.与对照相比,低氧气调包装(MAP)抑制了去壳雷笋贮藏前期丙二醛(MDA)的生成,显著抑制了过氧化物酶(POD)(P＜0.05)和苯丙氨酸解氨酶(PAL)活性(P＜0.01),最终显著抑制了笋肉的褐变(P＜0.01),显著抑制了木质素(P＜0.05)和纤维素的合成,从而延长了保鲜期.去壳雷笋的褐变可能由POD和PAL活性作用引起.POD和PAL活性的增加也可能诱导了木质素的合成.

Effects of Low Oxygen-Modified Atmosphere Packaging on Browning and Lignification of Peeled Bamboo Shoots

The browning and lignification of peeled bamboo shoots (Phyllostachys praecox f. prevelnalis) under modified atmosphere packaging (MAP) with a combination of 2% O(2)+5% CO(2)+93% N(2) in 0.04 mm polyethylene bag during storage at 10 degrees C were investigated. The results indicated malondialdehyde (MDA) content of bamboo shoots under MAP with low O(2) atmosphere was lower than that in the control during early storage, the activities of peroxidase (POD) and phenylalanine ammonia-lyse (PAL) were significantly inhibited (P<0.05 and P<0.01, respectively), and the browning of bamboo shoots under MAP with low O2 atmosphere was eventually significantly prevented (P<0.01) and cellulose and lignin contents were significantly decreased (P<0.05). The browning of bamboo shoots was probably caused by POD and PAL activities, and the increase in POD and PAL activities might account for the lignification of bamboo shoots.