Browsing by Author "Bundit Jarimopas"
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Item Firmness properties of mangoes(2007) Bundit Jarimopas; Udomsak Kitthawee; B. Jarimopas; Department of Agricultural Engineering, Faculty of Engineering, Kamphaengsaen Kasetsart University, Kamphaenagsaen, Nakohn Pathom, Thailand; email: jarimopas@yahoo.comThe purpose of this research was to determine the firmness of mango fruit at different stages of maturity. Immature, mature, and over mature fruit from two Thai mango cultivars (Nam Dokmai and Chok Anan) were subjected to two firmness measuring techniques: a slow compression technique using the Universal Testing Machine and a high-speed impact sensing technique using the low-mass impact tester. The firmness of a mango as determined by the compression test was expressed by the slope of the force-deformation graph, while firmness values derived from the impact test were defined by the ratio between maximum acceleration and the corresponding time (the firmness index). A very good correlation between the two indicators was obtained. Each firmness indicator of the two cultivars remained relatively unchanged from the immature through to the fully mature stage, although firmness rapidly decreased as the fruit ripened. The Chok Anan cultivar was firmer than the Nam Dokmai type throughout the development period. The impact method was able to determine mango firmness rapidly, accurately, and non-destructively.