辐照对蚕蛹贮藏期品质特性的影响

以真空包装的蚕蛹为材料，经0、3、6 kGy 60Co-γ射线辐照后，在4 ℃条件下贮藏0～60 d，研究不同辐照剂量和不同贮藏时间（0、30、60 d）条件下蚕蛹的感官指标与品质的变化。结果表明：1）辐照蚕蛹的色度值、酸值、脂肪含量、微生物数量显著降低，硬度、咀嚼性、过氧化值显著升高；感官评分、蛋白质含量和弹性无显著变化。2）在贮藏期间，辐照蚕蛹的色度值、微生物数量随辐照剂量的增加而降低；硬度、咀嚼性、脂肪含量随剂量的增加而增加；过氧化值增加的幅度低于对照，且辐照剂量较高的处理增加幅度较为缓慢；酸值无明显变化。3）6 kGy辐照对蚕蛹具有显著的杀菌效果。由此可见，辐照改善了蚕蛹的贮藏品质，杀菌效果显著，有利于延长蚕蛹的保鲜期。

Effect of Irradiation on Quality Characteristics of Stored Silkworm Chrysa

Samples of vacuum packaged silkworm chrysalis were irradiated using 60Co gamma ray at 0, 3, and 6 kGy and
stored at 4 ℃ for 60 days to explore changes in sensory indicators and quality of silkworm chrysalis with different gamma
irradiation doses and storage times (0, 30, and 60 days). The results showed that the chroma value, acidity value, fat content
and microbial quantity of silkworm chrysalis significantly decreased after irradiation, whereas the hardness, chewiness and
peroxide value significantly increased. No significant change in sensory evaluation, protein content or springiness was found.
The chroma value and microbial quantity decreased significantly with increasing irradiation dose during the entire storage
period, while hardness, chewiness, and fat increased. Peroxide value increased firstly and then decreased with increasing
irradiation dose. A lower increment in peroxide value was found when compared to the control. At higher irradiation dose,
peroxide value increased relatively slowly, but no significant change in the acidity value was seen. The sterilization effect of
6 kGy irradiation on silkworm chrysalis was better. It was concluded that irradiation could improve safely and effectively the
storage quality of silkworm chrysalis, resulting in prolonged preservation period.