高氧气调对蒜米贮藏性的影响.rar

摘要:本文以蒜米为原料，通过高氧气调包装实验，研究了不同氧气浓度对蒜米呼吸强度、过氧化物酶、多酚氧化酶、过氧化氢酶、超氧歧化酶、丙二醛含量、α-葡萄糖苷酶及质构贮藏性的影响。实验设对照组、40%、60%、80%、100%五个不同氧气浓度，在4±1℃条件下冷却贮藏20d，每隔2天对蒜米样品进行呼吸强度、过氧化物酶、多酚氧化酶、过氧化氢酶、超氧歧化酶、丙二醛含量、α-葡萄糖苷酶及质构的测定。

　　　结果表明，80-100% O2处理抑制了PPO活性的上升和减缓了MDA的积累，并保持了SOD酶、CAT酶、α-葡萄糖苷酶的活性，对蒜米的弹性和咀嚼性起到保护作用。20d时，80%O2高氧处理的蒜米的PPO酶活性、SOD酶活性、MDA含量分别为90.89 Ug-1(FW)、49.7 Ug-1(FW)、0.061µmol/g，100%O2高氧处理的蒜米的PPO酶活性、SOD酶活性、MDA含量分别为117.27 Ug-1(FW)、50.1Ug-1(FW)、0.05µmol/g。60%O2处理抑制了PPO酶活性，减缓了MDA含量的积累，保持了CAT酶活性，对蒜米的硬度起了一定保护作用。从实验结果看来，80%O2处理蒜米在4±1℃下储藏9d的贮藏效果最佳。 

关键词  蒜米；高氧气调；多酚氧化酶；过氧化物酶；丙二醛； α-葡萄糖苷酶

Abstract:In this paper, taking garlic rice as raw material, we investigated the effect of different oxygen concentration on respiration intensity, POD, PPO, CAT, SOD, MDA, α-glueosidase and texture quality. The samples were classed as control test, 40%、60%、80% and 100% groups and conserved at the condition of 4±1℃ . During refrigeration storage, every two days, respiration intensity, POD, PPO,CAT, SOD, MDA, α-glueosidase and texture quality were determined.

　　Results show that 80-100%O2 PPO activity of climbing and slowed the accumulation of MDA, maintaining SOD, CAT enzymes, enzyme activity of Alpha-glucosidase, elastic and chewing on garlic play a protective role. At 20d , PPO enzyme activity, and SOD enzyme activity, and MDA content respectively of garlic processing with 80%O2 high oxygen were for 90.89 U.g-1  (FW), and 49.7 U.g-1.(FW), and 0.061 µg mol/g,100%O2 high oxygen processing of garlic m of PPO enzyme activity, and SOD enzyme activity, and MDA content respectively for 117.27 U.g-1 . (FW), and 50.1 U.g-1.(FW), and 0.05 µmol/g. In point of view, the result of the experiment 80% O2 processing garlic stored under 4 + / - 1 ℃ 9 d of storage effect is best.

Keywords   High oxygen Packing  Garlic  Polyphenol oxidase  Peroxidase  MDA α-glucosidase