Optimization of sterilization technique of high-moisture dried longan
Effects of sterilization temperature,sterilization time,moisture content and packaging method on germicidal efficacy of high-moisture dried longan were studied.Based on single factor test,orthogonal tests were applied to optimize the sterilizing technique for high moisture dried longan.Results showed that the optimal sterilizing conditions were moisture content 40%,sterilization time 35 min,sterilization temperature 85 ℃ for non-vacuum-packed dried longan and moisture content 45%,sterilization time 35 min,sterilization temperature 85 ℃ for vacuum-packed dried longan.Effects of sterilization temperature and sterilization time on germicidal efficacy of high-moisture dried longan were similar,while effect of moisture content of dried longan was much smaller.Under the same sterilizing conditions,the sterilizing rates of vacuum-packed dried longan were higher than those of non-vacuum-packed dried longan.Influences of moisture content on sterilizing rate didn't show obvious changes in vacuum-packed dried longan. However, in non-vacuum-packed dried longan, the sterilizing rate decreased as the moisture content increased.