茶油中苯并(a)芘溯源及含量控制技术研究

来源 :2014年全国生物技术与食品质量博士后学术论坛 | 被引量 : 0次 | 上传用户:dy112334
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  为了探明茶油中苯并(a)芘的来源,研究了原料、干燥方式、烘烤温度、时间、制油方式等因素对茶油中苯并(a)芘含量的影响,考察了茶油在精炼过程从脱胶,脱酸,脱色至脱臭过程中苯并(a)芘含量的变化.结果 表明,烘烤工艺、制油方式与油脂精炼是茶油中苯(a)芘含量的主要影响因素.与压榨法相比,浸提法制得的茶油中苯(a)芘的含量无显著差异(p>0.05);当温度在90-150 ℃、时间为0.5-3 h时,随着烘烤温度升高与时间的延长,茶油中苯并(a)芘含量持续增加,因此,在保证茶油品质与生产工艺要求的前提下,应尽量缩短烘烤时间、降低烘烤温度;茶油精炼中的脱色能有效脱除茶油中的苯并(a)芘,温度为120 ℃,用6%的白土脱色20 min后,茶油中的苯并(a)芘从脱色前的3.7570 μg/kg降到了0.2654 μg/kg,苯并(a)芘的脱除率达到93.08%.
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