高粱乌米钴源辐照保鲜技术研究

Study on ^(60)Co-γ Irradiating Fresh-keeping Technology of Sorghum Wumi

采用60Co-γ射线源40、70、100、200 Gy等4个辐照剂量处理高粱乌米,对其感官及生理生化指标的试验结果分析可知,在高粱乌米的保鲜水平上,辐射处理可起到更好的作用:(1)可有效的延长高粱乌米的保鲜期,且随着辐射剂量的增加其保鲜期相应延长;(2)对高粱乌米的质量损失具有较好的抑制作用,失重率随着辐照剂量的增加而显著降低,适当设计辐照剂量高量能更好的抑制高粱乌米的质量损失;(3)加剧乌米膜脂过氧化,但适当的剂量能有效的降低乌米菌体的PPO活力,可抑制或者延缓其褐变的发生;(4)可损伤高粱乌米菌体的抗氧化水平,降低乌米菌体的CAT活力,但剂量较低时可有一定程度的恢复,而剂量过高时会对其抗氧化能力造成不可恢复的损伤;(5)可破坏高粱乌米的膜结构,加剧膜脂过氧化,不利于其保鲜储藏,但较低的辐照剂量对高粱乌米菌体的MDA含量影响较小。综合考虑射线照射效率和高粱乌米营养物质的损失等原因,60Co-γ射线处理高粱乌米的最佳剂量为70~100 Gy。

This paper use different radiation dose, including 40,70,100,200 Gy to processed sorghum wumi and some physiological and biochemical indexes were determined regularly, the result showed that the treat- ment could achieved a desirable effect on fresh-keeping of sorghum wumi. （ 1 ） It can effectively prolong The fresh-keeping period of sorghum wumi and with the increasing radiation dose The fresh-keeping period of sor- ghum wumi is prolonged accordingly. （2） It has better inhibition to loss of weight and with the increasing radia- tion dose, the loss of weight significantly reduces. The appropriate design of radiation dose can reduce the loss of weight of sorghum wumi better. （3） It can Intensify membrane lipid peroxidation of sorghum wumi. But the appropriate dose can effectively reduce the PPO activity of sorghum wumi and may inhibit or delay the brown stain. （4） It can damage the antioxidant level of sorghum wumi and reduce the CATactivity, But the lower dose may have a certain degree of recovery,while higher dose can cause unrecoverable damage to its antioxidant a- bility. （5）It may destabilize the Membrane structure of sorghum wumi, Increase membrane lipid peroxidation and be not conducive to the fresh-keeping storage. But at lower radiation dose,the content of MDA is less af- fected. Considering the ray radiation efficiency,nutrient loss and other reasons,The optimal dose of 60Co-y ray treatment of sorghum wumi is 70 - 100 Gy.