Effects of CPPU and CoSO4 on postharvest quality of mangosteen fruit (Garcinia mangostana l.) during storage.

Abstract

Mangosteen (Garcinia mangostana L.) fruit is one of the most delicious tropical fruits, known as “queen of tropical fruit” with short shelf life during storage. The research objective was to study the effects of CPPU and CoSO4 on postharvest quality and physiological changes of mangosteen fruit during storage. The experimental design was arranged in a completely randomized block design (CRBD) with two factors, i.e., cobalt sulphate and CPPU. Postharvest treatment with CPPU was found to be effective to promote lightness of mangosteen fruit at day 4 and day 6, while CoSO4 tended to accelerate the darkening in both fruit and sepal. The resistance of mangosteen fruit pericarp was considered as low (less than 2 kgf/cm2), representing that fruit were still easily to be opened during 30 days of storage. CPPU and CoSO4 were less effective in inhibiting fruit hardening. Titratable acidity was significantly reduced in CPPU-treated fruit at the end of storage, while total soluble solids were not clearly affected by the treatment. TSS/TA ratio was significantly higher in fruit treated with CPPU at the end of storage. Respiration rate of mangosteen fruit was low and remained constant with prolonged storage period. CPPU and/or CoSO4 could considerably decrease the respiration rate, but less effective in inhibiting ethylene production during storage at 14oC-16oC (78%-96% RH).