基于浸出茶油香气成分压榨茶油掺伪模型及应用

Adulteration model establishment of camellia oil based on aroma components extracted from camellia oil and its application

目的:解决压榨油茶籽油中掺入浸出油茶籽油的定量检测问题。方法:采用HS-SPME-GC-MS法对精炼浸出茶油和3种添加香精浸出茶油的关键香气成分进行测定和分析;将4种原香茶油和10种烤香茶油的香气成分相对含量与浸出茶油的香气成分相对含量进行对比,用浸出茶油中特有的香气成分作为特征数据进行Fisher判别分析,并建立LDA模型。结果:精炼浸出茶油中关键挥发性成分依次为(E)-2-癸烯醛、辛醛、(E)-2-壬烯醛和壬醛;3种添加香精的浸出茶油中特有的香精香气成分为2-甲氧基-3-甲基吡嗪、甲基环戊烯醇酮和2-甲基吡嗪。LDA模型对原香及烤香茶油的判别正确率分别达到84.0%和83.6%,能够鉴别原香及烤香茶油中掺伪比例为10%及以上的浸出茶油。结论:原香茶油的LDA模型能够很好地鉴别出添加茶油香精的浸出茶油,但烤香茶油的模型无法鉴别。

Objective:This study aimed to solve the problem of quantitative detection of adulteration of extracted camellia seed oil into pressed camellia seed oil.Methods:HS-SPME-GC-MS was used to determine and analyze the key aroma components of refined camellia oil and three kinds of extracted camellia oil with essence.The relative contents of aroma components in 4 kinds of original camellia oil and 10 kinds of roasted camellia oil were compared with those in extracted camellia oil.Fisher discriminant analysis was carried out with the characteristic data of aroma components in extracted camellia oil,and LDA model was established.Results:The key volatile components in tea oil extracted by refining were(E)-2-decenal,octanal,(E)-2-nonenal and nonaldehyde.The special aroma components of the three flavoring extracts were 2-methoxy-3-methylpyrazine,methyl cyclopentenolone and 2-methylpyrazine.The accuracy of LDA model was 84.0% and 83.6%,respectively,and it could identify the adulterated tea oil with 10% or more in the original and roasted tea oil.Conclusion:The LDA model of original camellia oil could well identify the extracted camellia oil with tea oil essence,but could not work in the model of roasted camellia oil.