Abstract:
Browning and softening of ripe mangosteens after minimal processing are main problems affecting the development of acceptable minimally processed product by consumer. The objective of this investigation was to extend shelf-life of minimally processed mangosteens (MPMs). The half-peeled mangosteens were immersed in various solutions including ascorbic acid (AA), oxalic acid (OA) and citric acid (CA) at concentrations of 0.25, 0.5 and 1% and distilled water (control) for 5 min, prior to packing in sealed polypropylene (PP) bags and storage at 10?1oC for 14 days. 0.5% AA 0.5% OA and 1% CA were the most effective concentrations of each individual solution for retarding discoloration of MPMs. Subsequently, a study on effects of dipping solutions on quality of MPMs was conducted. Fruits were dipped in various mixed solutions including 0.5% AA + 1% CaCl2, 0.5% OA, 1% CA + 1% CaCl2 and 1% CaCl2 (control) for 5 min, prior to packing in sealed PP bags and storage at 10?1oC for 14 days. 0.5% AA + 1% CaCl2 resulted in the best retarding discoloration, maintaining firmness and retention of organoleptic quality of MPMs. A subsequent study was carried out to assess the effects of modified atmosphere packaging (MAP) on quality of MPMs. Fruits were dipped in 0.5% AA + 1% CaCl2 for 5 min, prior to packing in various sealed plastic bags including PP, low density polyethylene (LDPE) type 1 and LDPE type 2 and storage at 10?1oC for 14 days. The packing under MAP in PP bag showed the superlative retention of physical, chemical and organoleptic qualities of MPMs. Additionally, total bacteria, total yeast and mold, lactic acid bacteria and Escherichia coli counts were acceptable during 13 days of storage.
WALAILAK UNIVERSITY. CENTER FOR LIBRARY RESOURCES AND EDUCATIONAL MEDIA