含水量对玉米粉贮藏期黄曲霉生长及黄曲霉毒素B1积累的影响

Effects of water content on growth of Aspergillus flavus and accumulation of aflatoxin B1 in corn flour during storage

中文关键词:  玉米粉  含水量  黄曲霉  黄曲霉毒素  相关性

英文关键词:corn flour  water content  Aspergillus flavus  aflatoxin  correlation

中文摘要:

      目的 研究含水量对玉米粉贮藏过程中黄曲霉生长及黄曲霉毒素B1积累的影响。方法 将初始水分含量10.42%、13.26%、16.35%、19.88%的玉米粉在28 ℃, 相对湿度75%的模拟环境中储藏30 d; 测定贮藏期间玉米粉含水量、黄曲霉生长量及黄曲霉毒素B1的积累量。结果 贮藏期间玉米粉中含水量呈现先上升后下降的变化趋势, 黄曲霉生长量及黄曲霉毒素B1的积累量随贮藏时间的延迟先快速升高, 后趋于平稳。初始含水量较高的玉米粉贮藏期间含水量、黄曲霉生长量及黄曲霉毒素B1含量始终处于较高的水平。相关性分析表明, 玉米粉含水量、黄曲霉生长量和毒素积累量之间均呈极显著的正相关(P<0.01)。结论 含水量是影响玉米粉贮藏过程中霉菌生长和毒素积累的关键因素, 降低玉米粉初始含水量可以有效减轻贮藏期间真菌危害。

英文摘要:

      Objective To study the effects of water content on growth of Aspergillus flavus and accumulation of aflatoxin B1 in corn flour during storage. Methods The corn flour with initial moisture content of 10.42%, 13.26%, 16.35% and 19.88% was stored at 28 ℃ and 75% relative humidity for 30 d. The water content of corn flour during storage, the growth of Aspergillus flavus and the accumulation of aflatoxin B1 were determined. Results During the storage period, the water content in corn flour increased first and then decreased. The growth of Aspergillus flavus and the accumulation of aflatoxin B1 increased rapidly with the delay of storage time, and then stabilized. The water content, the growth of Aspergillus flavus and the aflatoxin B1 content of corn flour with higher initial water content were always at a higher level during storage. Correlation analysis showed that there was a significant positive correlation between corn water content with Aspergillus flavus growth and toxin accumulation (P<0.01). Conclusion Water content is the key factor affecting mold growth and toxin accumulation during corn meal storage, so reducing the initial water content of corn flour can effectively reduce fungal damage during storage.