高阻隔包装材料构建的超低氧短期处理对仔姜贮藏品质的影响

Effect of short-term ultra-low oxygen treatment constructed by high barrier packaging materials on storage quality of baby ginger

为探究短期超低氧处理对仔姜贮藏品质的控制作用,选用高阻隔性PET12/PE15/CPP30复合膜为包装材料构建超低氧内环境,设置无超低氧组(一直打孔)、长期超低氧组(不打孔)、短期超低氧-1微孔组(超低氧3 d后打1个微孔)、短期超低氧-2微孔组(超低氧3 d后打2个微孔)4组,研究高阻隔包装材料构建的超低氧短期处理协同微孔包装对仔姜感官品质、膜脂氧化、色泽以及气味的影响。结果表明,长期超低氧组和无超低氧组对仔姜品质都产生了负面影响,其中长期超低氧组在贮藏过程中,会引发无氧呼吸,导致丙酮酸脱羧酶、乙醇脱氢酶活性上升,进而提高乙醛、乙醇含量,加剧了仔姜品质的劣变,产生异味;而短期超低氧-1微孔组和短期超低氧-2微孔组都能够形成仔姜适应的低氧高二氧碳气体环境,避免不良气味的产生,同时延缓了超氧阴离子自由基产生速率,提高了超氧化物歧化酶和过氧化氢酶活性,抑制了相对电导率和丙二醛含量的上升,从而减弱了膜脂过氧化,保护了细胞膜的完整性,且其多酚氧化酶活性得到抑制,总酚消耗得以减缓,使其色泽更优,感官品质更好,且以短期超低氧-1微孔组效果最佳。因此,短期超低氧处理协同微孔包装能够有效保持仔姜贮藏品质,且使用高阻隔性包装材料构建超低氧环境的成本很低,可避免气调包装机(如充100%氮气)形成超低氧环境带来的高成本问题。

To explore the effect of short-term ultra-low oxygen treatment on the storage quality of baby ginger,selecting the high barrier PET12/PE15/CPP30 composite membrane as the packaging material to construct the ultra-low oxygen(ULO)internal environment,set four groups,including non-ULO group(always drilling holes),long-term ULO group(no drilling holes),short-term ULO-1 microporous group(drilling one micropore after ULO for 3 days),and short-term ULO-2 microporous group(drilling two micropores after ULO for 3 days).The effects of short-term ULO treatment combined with microporous packaging constructed by high barrier packaging materials on sensory quality,membrane lipid oxidation,color and odor of baby ginger were studied.Results showed that both the long-term ULO group and the non-ULO group had bad effects on the quality of baby ginger.In the long-term ULO group,anaerobic respiration was induced during storage,resulting in the increase of the activities of pyruvate decarboxylase(PDC)and alcohol dehydrogenase(ADH),which increased the content of acetaldehyde and ethanol,aggravated the deterioration of the quality of baby ginger and produced peculiar smell.However,both the short-term ULO-1 microporous group and the short-term ULO-2 microporous group could form a low oxygen and high carbon dioxide gas environment suitable for baby ginger,avoid the generation of adverse odor,delay the generation rate of·O-2,improve the activities of SOD and CAT,and inhibit the rise of relative conductivity and MDA content,so as to weaken the membrane lipid peroxidation,protect the integrity of cell membrane,inhibit the PPO activity,and slow down the consumption of total phenols.It had better color and sense,and the effect of the short-term ULO-1 microporous group was the best in all processing groups.Therefore,the short-term ULO treatment combined with microporous packaging could effectively maintain the storage quality of baby ginger,and the cost of using high-barrier packaging materials to build a ULO environment was very low,which could avoid the high-cost problem caused by the ULO environment formed by the modified atmosphere packaging machine(such as filling 100%nitrogen).