螺旋藻粉辐照杀菌剂量的研究

Studies on the effect of the radiant dosage for spriulina polysacchrides

探讨了采用自然干燥法生产的螺旋藻藻条粉和人工喷雾干燥法制备的螺旋藻喷雾粉的辐照杀菌剂量,并对初始污染菌数、菌谱及营养成分进行了检测分析。结果表明,要使辐照后的藻条粉和喷雾粉的微生物控制达到细菌总数≤1.0×104CFU/g、霉菌数≤25CFU/g,藻条粉与喷雾粉的吸收剂量分别为10.1kGy和2.9kGy。但是,10.1kGy辐照使螺旋藻藻条粉的胡萝卜素含量损失40%以上,2.9kGy辐照喷雾粉的胡萝卜素含量损失仅为15%。

Powder samples of naturally dried and spray processed spriulina polysacchrides were irradiated to different doses from 1.2 to 13.5 kGy by 60Co γ-rays. Microbial tests were performed and the nutritional compositions were measured. The results showed that for decontamination down to 1.0 × 104 cfu/g of total number of bacteria and 25 cfu/g of fungi, the minimum doses were 10.1 kGy and 2.9 kGy for the naturally dried powder and spray processed powder, respectively. However, 10.1 kGy irradiation caused over 40% loss of carotene in the naturally dried powder, whereas 2.9 kGy irradiation caused just 15% loss of carotene in the spray processed powder.