Optimization and pilot-scale testing of modified atmosphere packaging of irradiated fresh 'Carabao' mango (Mangifera indica L.) fruits.
Yaptertco K. F., Lacao M. A. J., Esguerra E. B., Serrano E. P.
Author Affiliation: Agricultural and Bio-Process Division, Institute of Agricultural Engineering, College of Engineering and Agro-Industrial Technology, University of the Philippines Los Baņos, Laguna, Philippines.
Philippine Journal of Crop Science 35 : 23-33
Abstract : Modified atmosphere packaging (MAP) for fresh 'Carabao' mango was optimized with respect to the number of pinholes needed for a fixed respiration rate, fill weight, oxygen transmission rate (OTR), and bag surface area. Computer simulations showed that 38-mm polyethylene or 20-mm zeolite film with 52 or 44 pinholes, respectively, could be used for packing 5 kg of fruit in a bag with a surface area of approximately 0.80 m2 if held at 12.5°C. Subsequent laboratory trials using fruits irradiated at 150-250 Gy showed that 50 pinholes made with a 28-gauge cold needle could be used for both films; O2 levels during storage were close to the recommended levels of 3-5%. Pilot-scale trials using fruits harvested during the on- and off-season showed that both irradiation at 150-250 Gy and MAP could retard ripening and reduce softening. After 4 wk of storage at 12.5°C, MAP fruits were at a half-ripe and slightly-firm stage of ripeness, with minimal development of disease. Sensory tests at the table-ripe stage showed that irradiated MAP-stored fruits were acceptable.