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中文摘要：
[目的]构建苹果鲜榨汁品质评价体系，为苹果鲜榨汁品质的科学评价奠定基础。[方法]测定16项苹果鲜榨汁品质指标，用因子分析筛选品质评价指标，用概率分布进行品质评价指标分级，用层次分析确定品质评价指标权重，用K-均值聚类分析和判别分析建立苹果鲜榨汁品质判别函数。[结果]（1）苹果鲜榨汁品质指标（香气除外）之间离散度有异，变异系数在2．O％-112．2％；（2）从16项指标中选择7项指标作为苹果鲜榨汁品质评价指标（即香气、a值、b值、625nm透光率、浊度、可溶性固形物含量、固酸比）；（3）建立了7项苹果鲜榨汁品质评价指标的分级标准；（4）确立了7项苹果鲜榨汁品质评价指标的权重，并由此建立了其评分标准；（5）建立了苹果鲜榨汁品质判别函数，正确判别率达到98．89％（建模样本）和100％（检验样本）。[结论]苹果鲜榨汁品质可用香气、a值、b值、625nm透光率、浊度、可溶性固形物含量、固酸比等7项指标进行评价。建立的苹果鲜榨汁品质评价指标分级标准和评分标准为苹果鲜榨汁品质评价提供了科学依据。建立的苹果鲜榨汁品质判别函数有极高的判别准确性，可用于苹果鲜榨汁品质定性判别。
英文摘要：
[Objective] The aim of this study was to establish an scientific evaluation system for flesh apple juice quality. [Method] Sixteen indices of fresh apple juice quality were determined. Evaluation indices of fresh apple juice quality were screened by factor analysis and graded by probability distribution, and their weight was decided by analytic hierarchy process. Discrimination functions were established for fresh apple juice quality by K-means cluster and discriminant analysis. [Result] Indices of fresh apple juice quality （flavor not included） dispersed with coefficient of variation from 2.0% to 112.2%. From 16 indices, 7 indices were chosen as evaluation indices for fresh apple juice quality, including flavor, a value, b value, transmittance at 625 nm, turbidity, total soluble solid, and total soluble solid/titratable acidity. Both the grading standard and the scoring standard of above 7 indices were established. Five discrimination functions were established for flesh apple juice quality, which had satisfactory recognition accuracy up to 98.89% （modeling samples） and 100% （test samples）. [Conclusion] Fresh apple juice quality can be evaluated by 7 indices, including flavor, a value, b value, transmittance at 625 nm, turbidity, total soluble solid, and total soluble solid/titratable acidity. The grading standard and the scoring standard of these 7 indices set up a scientific foundation for evaluation of fresh apple juice quality. The established discrimination functions are very effective in discriminating fresh apple juice quality.
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