Abstract:
Changes in composition of cell and cell wall structure and activities of ripening enzyme
related to translucent pulp mangosteen in 5 developmental stages on tree and after storage of
mangosteen at room temperature (25°C) for 8 days were studied. It was found that flesh firmness
of both ripe mangosteens pulp on tree and after storage reduced rapidly because of the increasing
in WSP content from PL and Endo-PG activities during ripening while the translucent pulp
mangosteen had less flesh firmness reduction that caused the appearance of crispy, firm and
translucent. This occurred since the rising of insoluble pectin (EDTA-SP and 2CO3-SP) from PME activity as well as the optimum condition for ionic linkage between pectic acid and Ca2+ and ester linkage between pectin or pectic acid and other cell structural compounds, respectively. In
addition, lower activities of α- and β-galactosidase in translucent pulp than normal one which
related to the texture might influence the translucency appearance of pulp. Moreover, degradation
in composition of cell and cell wall structure also affected the increasing of sugar accumulation in
normal pulp that contrasting with the translucent pulp which the amount of sucrose decreased."