Abstract. In this study, the effects of two drying methods: hot-air and freeze drying for Thai green curry paste in a terms of drying time and qualities have been investigated. The hot-air drying was carried out in tray dryer at temperature of 50, 60 and 70 °C. The freeze drying was carried out in freeze dryer at freezing temperature of -20°C, primary drying temperature of -10°C and secondary drying temperature of 50°C. Moisture content, water activity, colour, bulk density, and total phenolic content (TPC) were determined in samples. Freeze dried sample had significantly (p<0.05) lower moisture content, water activity, bulk density, total colour difference and browning index than hot air dried samples. For antioxidant activity, the results showed hot-air drying at 70°C effected highest TPC similar to freeze drying.
This research studied the processing feasibility and quality of the premium mango powder ‘Mahachanok’ for SME business. Freeze-dried mango powder as alternative high quality mango powder. The frozen mango puree was thawed at 4°C for 12 hours. The freeze dry processes to freezing and vacuum drying product within a single chamber. The operation cycle included 3 main steps: First step was rapidly frozen with contact plate and air blast freezing at -50°C until core product temperature was -20°C. After that, two steps drying were operated at 40 Pa. The primary drying was operating until core product temperature reached to -10 0 10°C, respectively. The secondary drying temperature was controlled at 40°C. The freeze dried mango powder price reached to 1, 322.76 baht/kg. In addition, physical properties (total soluble solids, pH and color) of rehydrated freeze dried mango sample were similar to mango puree, which had not significantly different (p<0.05). Thus, freeze drying can be developed and applied to process as premium mango powder at the industrial level.
Mango (Mangifera indica L.) ‘Nam Dok Mai Si Thong’ is an important cultivar for export from Thailand. Export mainly takes place via air transport, but for about 2 h at the loading area (tarmac), unit loading devices (ULDs) are exposed to ambient environmental conditions. In this research, the effects of different temperature conditions at the loading area (tarmac) and the distance of the production area from the tarmac on the quality of fresh mango fruits were studied. The treatments included three temperature conditions for 2 h (simulated handling in tarmac)—constant temperature (20 °C), non-insulated or insulated and exposed to sun—and two distances of the tarmac from the production area—short distance (i.e., transport occurring 53 h after harvest) and long distance (i.e., transport occurring 70 h after harvest). The temperature variation in the boxes exposed to the sun was greater in the non-insulated than in the insulated boxes, but this effect was more pronounced in fruit from the short-distance production area (28.1 °C insulated and 36.9 °C non-insulated) than in fruit from the long-distance production area (34.2 °C insulated and 38 °C non-insulated). Insulation and short distance increased the shelf life, decreased weight loss, delayed the decrease in average firmness and rupture force, etc. The insulation of mango fruit boxes mitigates the deleterious effect of exposure to 2 h of direct sun by reducing the increase in temperature, thus improving the shelf life and quality of mango fruit.
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