Effects of harvest maturity on storage properties of Jinlan pomelobased on principal component analysis
LIN Xiong1, LI Hongxiang1, ZHANG Yanan1, MA Qiaoli1*, CHEN Jinyin1,2*
1(Jiangxi Key Laboratory for Postharvest Technology and Nondestructive Testing of Fruits and Vegetables, Collaborative InnovationCenter of Postharvest Key Technology and Quality Safety of Fruits and Vegetables in Jiangxi Province,JiangxiAgricultural University, Nanchang 330045, China) 2(Pingxiang University, Pingxiang 337055, China)
Abstract: To obtain the optimal harvesting maturity of Jinlan pomelo, 18 quality indexes of fruits harvested at 158, 173, and 188 days after blooming (maturityⅠ, Ⅱ, Ⅲ) were assayed during 150 days storage, and principal component analysis (PCA) was employed to comprehensively analyze the differences in storage characteristics arising from fruits with three maturities. The results showed that decay incidence and weight loss rate of fruit at maturity III were significantly lower than that of maturity I and II. Citrus color index (CCI) of maturity II and III were significantly higher than maturity I. The total sugar, sucrose, sugar/acid, FRAP of fruit at maturity III were obviously higher than those of fruit at maturity I and II, while total acid, glucose, fructose, citric acid, quinic acid, malic acid, tartaric acid, oxalic acid and ascorbic acid were in reverse; the content of total phenol and DPPH radical-scavenging activity of maturity III were among maturity I and II. PCA analysis showed that a comprehensive quality score of fruit at maturity III was highest among the three maturities during the whole storage, and the highest quality score was acquired by fruits of maturity III at 60 days postharvest. In summary, fruit harvest at 188 days post-bloom (maturity III) performed the best sensory quality and the highest antioxidant activity. The optimum storage period was 60 days.
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