摘要
糙米经不同剂量的60Co-γ辐照后,恒温(15±0.5)℃储藏1年,每3个月进行1次品质测定,并分析辐照剂量对储藏糙米各指标的影响。结果表明,储藏1年后,糙米表面颜色b值升高,储藏期间b值有波动,1.0 k Gy和2.0 k Gy的辐照后,糙米表面颜色b值显著增加(P<0.05),大米呈现发黄趋势;L值随着辐照剂量的增加而降低(储藏时间对L值没有显著影响);经1.0 k Gy和2.0 k Gy辐照的糙米感官评定颜色项得分显著低于对照组(P<0.05);脂肪酸值随着储藏时间延长持续上升,辐照剂量与脂肪酸值无明显相关性(P>0.05);溶解度和膨胀力都随着储藏时间延长而升高,第9个月达到峰值,随辐照剂量的增大,溶解度和膨胀力增大,米饭质构软化,米饭软硬度得分升高;糙米菌落总数含量随着储藏时间延长逐渐上升,但辐照剂量与菌落总数极显著负相关(P<0.01)。低剂量(0.2~0.5 k Gy)水平的辐照可显著优化储藏糙米理化指标,提高感官品质。
Brown rice were irradiated with the different dose of ^60Co -γ and stored at （ 15 ± 0.5 ） ℃ for 1 year. The quality of brown rice Was measured every three months, and the effect of irradiation on quality indexs of storage brown rice was analyzed. The results showed that after one year of storage, the b value increased, although it fluctuated during storage, b value increased significantly at the irradiation doses of 1.0 kGy and 2.0 kGy （ P 〈 0.05 ） , the surface of rice becomed yellow. L value decreased with the irradiation dose increasing （ storage time did not significantly affect the L value） ; when tasting rice, when rice was irradiated at 1.0 and 2.0 kGy the scores of color were significantly lower than the control group （ P 〈 0.05）. The fatty acid value of brown rice continued to rise with storage time extension. However there is no correlation between irradiation dose and fatty acid value （ P 〉 0.05 ） ; The solubility and expansion force of rice flour were increased with storage time extension, they reached peak value at nine months storage, with the irradiation dose increased, the solubitty and expansion force increased and texture of rice becomes softer. As a result, the score of texure rised. The aerobic plant content of brown rice gradually increased during storage, the irradiation dose and the aerobic plant content was negatively correlated significantly （P 〈 0.01 ）. Low dose irradiation （0.2 -0.5 kGy） can optimize the physical and chemical indicators of storage brown rice significantly. As well as the sensory quality of storage rice.
出处
《中国粮油学报》
EI
CAS
CSCD
北大核心
2015年第5期106-110,121,共6页
Journal of the Chinese Cereals and Oils Association
基金
国家粮食公益性行业科研专项(201313010)
江苏高校优势学科建设工程(PAPD)
江苏高校自然科学研究(13KJB550010)
关键词
糙米
储藏
Γ辐照
品质
brown flee, storage, gamma irradiation, quality
作者简介
陈银基，男，1979年出生，副教授，粮食工程
