Comprehensively analyze the effect of harvest ripening degree maturity on storage quality of Taoxi pomelo based on PCA
ZHAN Minxuan1, WEI Qingjiang1, LIN Xiong1, LI Hongxiang1, CHEN Jinyin1,2, MA Qiaoli1*
1(Jiangxi Key Laboratory for Postharvest Technology and Nondestructive Testing of Fruits and Vegetables,Collaborative Innovation Center of Postharvest Key Technology and Quality Safety of Fruits and Vegetables in Jiangxi Province, Agricultural College,Jiangxi Agricultural University,Nanchang 330045,China) 2(Pingxiang University,Pingxiang 337055,China)
Abstract: In order to understand the effects of harvest maturity on storage quality of Taoxi pomelo, principal component analysis (PCA) was used to re-analyze the change mode of 17 storage quality indexes collected from Taoxi pomelo fruits with different maturity (harvested at 178, 192 and 208 days post blooming, and marked by ripening degreeⅠ, Ⅱ and Ⅲ) during the 180 days storage. PCA analysis showed that ripening degree Ⅰ crossed respectively with ripening degreeⅡ and Ⅲ on PC1. Fruits with ripening degreeⅠ showed lower TA and TSS/TA; fruits with ripening degreeⅡ showed better flavor and color; and fruits with ripening degree Ⅲ showed lower rates of rot and weight loss. Changes of TSS, TA and L* in fruits of ripening degreeⅡ and Ⅲ were earlier than ripening degreeⅠ, and Change of total sugar content was retarded in fruits of ripening degreeⅡ. Change modes of ascorbic acid and total phenols were different at 60-90 days and 120-150 days respectively, among the three maturated fruits. The comprehensive quality score of fruit with ripening degreeⅡ (> 1) was significantly higher than that of the other two maturity fruits (<0.7) within 60-180 d. Based on the results of PCA, it was concluded that Taoxi pomelo showed post-maturation progress during storage, and the glossiness, flavor and antioxidant activities were distinctively different among fruits with different ripening degree, but less different in coloration. Fruits harvested 192 days post blooming (maturity Ⅱ) displayed the best storage quality, and it is optimum to store till 90 days.
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