Evaluation indices of sour flavor for apple fruit and grading standards

YAN Zhen; ZHENG Li-jing; NIE Ji-yun; LI Zhi-xia; CHENG Yang

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Evaluation indices of sour flavor for apple fruit and grading standards

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In order to establish grading standards of evaluation indices for sour flavor of apples, 10 indices of samples from 106 apple cultivars were tested, including: malic acid (Mal), oxalic acid (Oxa), citric acid (Cit), lactic acid (Lac), succinic acid (Suc), fumaric acid (Fum), total organic acids (ToA, the sum of the six organic acids tested), titratable acid (TiA), acidity value (AcV), and pH value. For most of the cultivars studied (85.8%), the order of the organic acid contents in apples was Mal>Oxa>Cit>Lac>Suc>Fum. Mal was the dominant organic acid, on average, accounting for 94.5% of ToA. Among the 10 indices, the dispersion of pH value was the smallest with a coefficient of variation of only 8.2%, while the coefficients of variation of the other nine indices were larger, ranging between 31 and 66%. There were significant linear relationships between Mal and two indices (ToA and AcV) as well as between ToA and AcV. There were significant logarithmic relationships between pH value and four indices: Mal, TiA, ToA, and AcV. All the equations had very high fitting accuracy and can be used to accurately predict related indices. According to this study, Mal, ToA, and AcV of apple were normally distributed, TiA was close to normally distributed, whereas pH value had a skewed distribution. Using the fitted normal distribution curves, the grading standards of Mal, TiA, ToA, and AcV were established. The grading node values of pH value were obtained using the logarithmic relationship between pH value and Mal. The grading standards of these five indices can be used to evaluate the sour flavor of apple. This study provides a scientific basis for evaluating apple flavor and selecting apple cultivars.

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《农业科学学报（英文版）》 |2018年第5期|994-1002|共9页
作者
YAN Zhen; ZHENG Li-jing; NIE Ji-yun; LI Zhi-xia; CHENG Yang;
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作者单位

Laboratory of Quality & Safety Risk Assessment for Fruit (Xingcheng), Ministry of Agriculture/Institute of Pomology, Chinese Academy of Agricultural Sciences, Xingcheng 125100, P.R.China;

Laboratory of Quality & Safety Risk Assessment for Fruit (Xingcheng), Ministry of Agriculture/Institute of Pomology, Chinese Academy of Agricultural Sciences, Xingcheng 125100, P.R.China;

Beijing Agriculture Technology Extension Station, Beijing 100029, P.R.China;

Laboratory of Quality & Safety Risk Assessment for Fruit (Xingcheng), Ministry of Agriculture/Institute of Pomology, Chinese Academy of Agricultural Sciences, Xingcheng 125100, P.R.China;

Laboratory of Quality & Safety Risk Assessment for Fruit (Xingcheng), Ministry of Agriculture/Institute of Pomology, Chinese Academy of Agricultural Sciences, Xingcheng 125100, P.R.China;

Laboratory of Quality & Safety Risk Assessment for Fruit (Xingcheng), Ministry of Agriculture/Institute of Pomology, Chinese Academy of Agricultural Sciences, Xingcheng 125100, P.R.China;

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Evaluation indices of sour flavor for apple fruit and grading standards

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