人工气调对小青菜叶绿素降解的影响

Effect of Controlled Atmosphere on the Degradation of Chlorophyll in Brassica chinensis L.

本文研究了4%O_(2)条件下,不同CO_(2)比例(4%CO_(2)、8%CO_(2)、12%CO_(2))的人工气调(CA)对小青菜外观品质和叶绿素降解的影响。结果表明:人工气调能够有效延缓小青菜的黄化,减小失重率,有效保持小青菜外观品质。对比空气环境贮藏的对照组,人工气调可以显著延缓小青菜中叶绿素a/b的降解,贮藏第12天,4%CO_(2)处理组中的叶绿素a/b含量分别为48.20,40.45μg/g FW。在小青菜贮藏前4 d,人工气调可抑制叶绿素酶、脱镁螯合酶活力的上升,其中4%CO_(2)处理组的叶绿素酶活力为23.09 U/g FW,脱镁螯合酶活力较对照组降低了43.03%。在贮藏后期,4%CO_(2)处理有效延缓脱镁叶绿素酶、叶绿素过氧化物酶活力的升高,分别为5.49,1.90 U/g FW。总的来看,小青菜在4%O_(2)+4%CO_(2)人工气调贮藏下效果较好。

This paper studied the effects of controlled atmosphere(CA)with different CO_(2) ratios(4% CO_(2),8% CO_(2),12%CO_(2))on the appearance quality and chlorophyll degradation of Brassica chinensis L.under the condition of 4% O_(2).The results showed that CA could effectively delay the yellowing of Brassica chinensis L.,reduce the weight loss rate and effectively maintain the appearance quality of Brassica chinensis L.Compared with the control group stored in the air environment,CA could significantly delay the degradation of chlorophyll a/b in Brassica chinensis L.On the 12 thday of storage,the chlorophyll a/b content in the 4% CO_(2) treatment group was 48.20 μg/g FW and 40.45 μg/g FW.4 days before storage,the activity of chlase and MD was inhibited by CA,the activity of chlase in 4% CO_(2) treatment group was23.09 U/g FW,and MD was 43.03% lower than that in control group.At the later stage of storage,4% CO_(2) treatment effectively delayed the increase of the activity of PPH and Chl-POX,which were 5.49 U/g FWand 1.90 U/g FW.In general,the CA condition of 4% O_(2)+ 4% CO_(2) seemed to be optimal for Brassica chinensis L.storage.