Storage Quality Changes and Correlation Analysis of Rice after Low Temperature Released
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Abstract:
In order to investigate the quality changes of rice after low temperature storage, the quality indexes, such as malondialdehyde content (MDAC), fatty acid value (FAV), falling number, electrical conductivity rate (ECR), peroxidase (POD) and polyphenoloxidase (PPO) were measured for samples stored in the stimulated high temperature environments of the typical rice storage areas in China (35 ℃, 80% RH and 30 ℃, 70% RH), and rice stored at ambient temperature was used as the control. Then the correlation between quality indexes and eating quality of rice were analyzed and a prediction model for eating value was established. The results showed that after low temperature storage was released, the activity of POD and PPO decreased with the time prolonging, while the FAV, ECR and the falling number increased. The MDAC of rice increased at first and then decreased. Under the stimulated conditions, the rice quality changed fast, which was not suitable for rice storage. The shelf-life of rice in the 35 ℃ with 80% RH, 30 ℃ with 70% RH conditions and ambient temperature was 75 d, 100 d and 175 d, respectively. The verification test of rice quality showed that the model was credible.
