Effects of on-tree storage on quality and respiratory intensity of ponkan fruits
[Objective]The change characteristics in quality of ponkan fruit stored on tree were explored to provide the theoretical basis for pro-longing the supply period of fresh ponkan fruit.[Method]Taking on-tree stored ponkan as test materials and fruits stored at room temperature as the control,the effects of on-tree storage methods on the quality of soluble solids,peel color,total sugar,organic acid and off-flavour and re-spiratory intensity of ponkan fruit were studied by liquid chromatography,gas chromatography and colorimeter methods.[Result]The soluble solid content of on-tree stored ponkan fruits was higher than CK during 40-80 days,and was 14.06％and 17.28％higher than CK signifi-cantly on 60 and 70 days,respectively.The total sugar was 23.31％,6.24％,17.65％and 18.82％lower than CK on 20,40,50 and 70 days.The citric acid of ponkan fruits stored on tree was 1.26-1.92 times higher than CK during 10-80 days.The value of red saturation a*decreased 2.13-5.03 during 30-80 days,and the peel color was yellow and orange.The respiratory intensity of ponkan fruits stored on tree was 1.16％-127.54％higher than CK except for storing on 40 days.When storing for 80 days,the off-flavour representative substance of etha-nol content in ponkan fruit stored at room temperature reached the peak of 293.28 μg/g,which was 3.29 times higher than that of fruit pre-served on tree.[Conclusion]It is suggested that the optimum period for on-tree stored fruits are around the Spring Festival from mid and late Janu-ary to early February.The on-tree stored ponkan fruit can be kept beautiful fruit peel,suitable solid-acid ratio,rich flavor and high benefit.
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