基于因子-聚类分析的水蜜桃分级方法研究

Grading Method of Juicy Peaches Based on Factor-Cluster Analysis

目的为了研究水蜜桃大小与内在品质的相关性,探索合理的分级方法,为优质水蜜桃的分级、贮运生产提供理论依据。方法以“玉露”水蜜桃为实验材料,测定单果质量、纵径、横径、可溶固形物含量、可滴定酸含量、固酸比等指标,并对各指标进行因子-聚类分析。结果水蜜桃大小指标(单果质量、纵径、横径)与品质指标(可溶固形物含量、可滴定酸含量、固酸比)相关性不显著;通过因子分析提取了2个因子成分,其累计方差贡献率为78.401%,较好地代替原有指标来综合评价水蜜桃的品质,再通过聚类分析将桃分成4个等级,各等级桃果的品质指标均呈现梯度变化。结论基于因子-聚类分析的水蜜桃方法能按照桃果的综合品质进行分级,符合生产实际和消费需求。

The work aims to study the correlation between the size and quality of juicy peach and explore a reasonable grading method,so as to provide theoretical basis for grading,storage,transportation and production of high-quality juicy peach."Yulu"juicy peaches were used as test materials to measure the weight,transverse diameter,vertical diameter,total soluble solids(TSS),titratable acidity(TA)and TSS-TA ratio of single peach.Factor-Cluster analysis was carried out to these indexes.There was no significant correlation between size indexes(weight,vertical diameter and transverse diameter of single peach)and quality indexes(total soluble solids(TSS),titratable acidity(TA)and TSS-TA ratio).Two principal components were extracted through factor analysis and their cumulative variance contribution rate was 78.401%,thus comprehensively evaluating the quality of juicy peach instead of original indexes.The peaches were classified to 4 grades by cluster analysis and the quality indexes of peach fruits of all grades showed gradient changes.Factor-Cluster Analysis is a reasonable grading method for Juicy peach,which conforms to the actual production and consumption demand.