^(60)Co-γ射线对葡萄籽超微粉辐照灭菌及对其主要功能性成分的影响

Effects of ^(60)Co-Gamma-ray Irradiation on Sterilization and Main Functional Components of Grape Seed Superfine Powder

研究60Co-γ射线辐照葡萄籽超微粉的灭菌效果及对其主要功能性成分的影响。结果表明,辐照能有效的杀灭葡萄籽超微粉中的微生物。随着辐照剂量的增加,葡萄籽超微粉中的含菌量呈同步下降趋势,细菌和霉菌的D10值分别为3.51、4.26kGy,霉菌对60Co-γ射线耐受力高于细菌。适宜的辐照加工剂量为8～9kGy。葡萄籽超微粉经过8kGy辐照后其卫生指标达到保健品国家标准要求,总多酚、原花青素和白藜芦醇含量无显著变化。经辐照灭菌后的葡萄籽超微粉具有较好的耐贮藏性,可有效地提高保质期。

The effects of different doses of ^60Co gamma-ray on the total bacterial, coliform and mould counts of grape seed superfine powder were explored according to the Chinese national standards of GB4789.2-- 2003, GB4789.3 -- 2003 and GB4789.15 --2003, respectively, and the changes in main functional components including total ployphenols, procyanidines and resveratrol of the grape seed superfine powder irradiated by different doses of ^60Co gamma-ray were investigated and the mathematical models of their contents as a function of irradiation dose of ^60Co gamma-ray were established. The results showed that ^60Co gamma-ray irradiation could effectively kill bacteria, coliform and mould in the grape seed superfine powder, and the percentages of these microorganisms synchronously decreased with the increase of irradiation dose. The D10 values of bacteria and mould were 3.51 and 4.26 kGy respectively, the tolerance of mould to irradiation was higher than that of bacteria, and the optimum irradiation dose for sterilization was in the range of 8-9 kGy. After the ^60Co gamma irradiation at 8 kGy, the hygienic target of the grape seed superfine powder fitted the Chinese national standard of health products, and the contents of total polyphenols, procyanidines and resveratrol did not significantly change. Furthermore, the grape seed superfine powder had better storabilitv to lengthen the storage life and maintain good auality after sterilization by ^60Co gamma-ray.