Nghiên cứu sự ổn định của acid ascorbic trong điều kiện xử lý nhiệt kết hợp với áp suất cao (mô hình mẫu)
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Thermal and combined high pressure-thermal degradation kinetics of ascorbic acid in sodium acetate buffer (0.2 M, pH 5.0) and sodium phosphate buffer (0.1 M, pH 7.0) were studied at different molar ratios between oxygen and ascorbic acid. Thermal degradation of ascorbic acid could be described by a biphasic model, suggesting that the degradation occurred through aerobic and anaerobic pathways. It was observed that the ascorbic acid degradation had already occurred during pressure build up probably due to oxidation (aerobic degradation). When the oxygen was totally used up, the anaerobic degradation dominated and took place much more slowly than aerobic degradation. Thus, it seemed that ascorbic acid was stable at pressures up to 700 MPa combined with temperatures up to 70°C (up to 100 min of treatment after pressure build up). However, ascorbic acid was degraded at extreme pressure temperature combinations such as temperatures above 70°C combined with pressures above 700 MPa. The molar ratio between ascorbic acid and oxygen was an important parameter to estimate the proportion of ascorbic acid aerobic degradation and to determine the concentration of ascorbic acid needed to protect other nutrients during processing.
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