Study on chemical composition, cell viability and influence of water on flesh translucent disorder in mangosteen (Garcinia mangostana L.)
1996
Voraphat Luckanatinvong
Development of flesh translucent disorder of mangosteen fruits was studied by chemical composition analysis. It was found that soluble solids and titratable acidity in normal aril were slighthly higher than translucent aril. It was also related to water soluble pectin fraction which was 0.55 ng/100 g fresh weight higher in normal aril. CDTA soluble pectin fraction was not significantly different, but Na2CO3 soluble pectin fraction in translucent aril was 0.53 ng/100 g fresh weight higher. Air space in the normal aril was approximately 15 times or 1.02 percent of the aril volume higher than that in translucent aril. On the orther hand, water content was 1.21 percent higher in translucent aril. The results indicated that water had replaced air in the aril and causing the translucent appearance. Translucent aril was 3 times firmer than the normal aril. The findings supported the assumption that translucent aril was caused by excess uptake of water causing higher turgor pressure and resulting in disruption of plasmamembrane and cell death. Water and solutes leaked out form the protoplast to the inter cellular space, causing pectin to change from water soluble to insoluble form, hence the aril became translucent and firmer. However, cell viability tested by triphenyltetrazodium chloride staining, ion leakage measurements, CO2 and C2H4 productions measurements did not clearly show that viability of translucent aril was lower than the normal aril. When water was forced into harvested mangosteen fruit via the peduncle, fruit cracking increased with increasing pressure and time. However, no translucent aril was found.
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