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【目的】为探索烤烟游离氨基酸与外观品质的关系。【方法】利用6个省份不同质量档次的186份烟叶样品,分析了各产区游离氨基酸含量与组成的差异性,并进行游离氨基酸指标与外观品质的简单相关分析。【结果】(1)各类游离氨基酸含量与组成在不同产区间差异较大,游离氨基酸总量以河南、四川较高,贵州、湖南居中,福建、辽宁较低;(2)同产区不同质量样品各游离氨基酸指标变异系数大多超过10%,部分超过40%;(3)一定范围内,随着烟叶颜色的加深,酸性、芳香族和脂肪族氨基酸比例降低,亚氨基酸比例升高;随着烟叶油润感变差、色度变弱,芳香族氨基酸比例以及酸性、碱性、脂肪族氨基酸含量和比例升高,亚氨基酸比例降低。【结论】烤烟烟叶游离氨基酸含量与组成存在明显的区域分布特征;同一产区内,烤烟烟叶的颜色深浅、油润感和色度强弱与其游离氨基酸含量及组成存在一定的相关性。
【Objective】 To explore the relationship between free amino acids and appearance quality in flue-cured tobacco. 【Method】 A total of 186 tobacco leaf samples of different quality grades from 6 provinces were used to analyze the differences of free amino acid content and composition in each producing area. A simple correlation analysis between free amino acid index and appearance quality was carried out. 【Result】 (1) The content and composition of various free amino acids varied greatly among different producing areas. The total amount of free amino acids was higher in Henan and Sichuan, lower in Guizhou and Hunan, and lower in Fujian and Liaoning. (2) The coefficient of variation (CV) of each free amino acid index was mostly over 10% and some over 40% in different quality samples. (3) Within a certain range, the proportion of acidic, aromatic and aliphatic amino acids decreased, With the deterioration of tobacco leaf oil feel, weakened chroma, aromatic amino acid ratio and acidic, basic, aliphatic amino acid content and proportion increased, the proportion of imino acids decreased. 【Conclusion】 The contents and composition of free amino acids in flue-cured tobacco leaves showed obvious regional distribution. In the same producing area, the flue-cured tobacco leaves had some correlations with the content of free amino acids and the content of their free amino acids.