电子束辐照灭菌对豆粕营养品质的影响

采用不同剂量(0、0.83、1.56、2.30、4.93、7.84 kGy)的电子束辐照饲用豆粕样品,研究其对饲用豆粕营养品质的影响.结果显示,辐照剂量为0.83 kGy以上时豆粕样品中霉菌总数小于10 CFU/g,辐照剂量为2.30 kGy时豆粕样品中细菌总数下降至100 CFU/g;不同剂量的电子束辐照对豆粕的蛋白质含量、氨基酸的含量与组成、蛋白质溶解度的影响不明显；电子束辐照能影响豆粕的尿素酶活性(P＜0.05),且随着辐照剂量的增加尿素酶活性降低.结果表明,2.30～7.84 kGy剂量的电子束辐照能有效控制豆粕中的微生物,且对豆粕营养品质的影响不显著.

Effect of Electron Beam Irradiation on the Nutrition Quality of Soybean Meal

Samples of soybean meal were exposed to electron beam with dosage levels of 0,0.83,1.56,2.30,4.93,7.84 kGy,to evaluate the efficacy of electron beam for decontamination as well as the effect of electron beam irradiation on the nutrition quality in soybean meal.The results showed that the total fungi number were inhibited to 10 CFU/g by irradiation when the dose was above 0.83 kGy,whereas the total number of aerobic bacteria were reduced to 100 CFU/g when soybean meals were given a irradiation dose of 2.30 kGy.The protein content,amino acid composition and protein solubility of soybean meal samples were not significantly influenced by irradiation(P>0.05),but the urease activity was significantly decreased with the increasing irradiation dosage(P<0.05).It was indicated that the irradiation dose of 2.30~7.84 kGy was effective for microbial decontamination in soybean meal,and had no adverse effects on the nutritional quality of soybean meal.