The research objective is to study the effects of chitosan and plastic wrapping on mangosteen fruits harvested in different stages to prolong fruit shelf-life and maintain high quality. This research used a randomized complete block design of 4 x 3 x 2 factorial. The first factor was maturity stage (0, 2, 3, and 4), the second was chitosan (0, 1.25, and 2.50%), and the third was plastic wrapping (without and with one-layer plastic wrapping). The results showed that fruit stages 0 and 2 had a shelf-life of 2.96 and 3.15 days longer than later stages. Single-chitosan treatment of 2.5% was able to extend shelf-life by 6.48 days longer than the control, and plastic wrapping could prolong shelf-life by 3.85 days longer than the control. Applying 2.50% chitosan and plastic wrapping to stages 0 and 2 lengthened fruit shelf-life significantly to 21.20 and 19.83 days, respectively, with the fruit qualities unaffected. Because there may be misjudged fruit physiological maturity of fruits at stage 0, applying 2.50% chitosan and plastic wrapping to fruit stage 2 seems more reasonable.

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