Technology of Vacuum Pre-Cooling to Keep Son-taroes Fresh in Cold Storage

In this paper, the technology of vacuum pre-cooling together with plastic film packing was applied to the son-taroes's keeping fresh in cold storage. The influence of different technological conditions of vacuum pre-cooling on the effect of keeping fresh was studied. The optimal condition was obtained as follows: the vacuum of chamber was 650 Pa, the temperature in vacuum chamber was 4℃, and the time of vacuum pre-cooling was 30 minutes. Under these conditions, the effect was obviously better than that of the ordinary keeping fresh in cold storage. There were no wrinkles on the surface of son-taroes, The rate of good son-taroes increased 19.5 percentage points. The rate of weight loss decreased 15.5 percentage points. The strength of respiration of son-taroes decreased obviously. The respiration's peak value decayed 10 days and peak value decreased by 20.2%. The keeping rate of total-sugar increased 23.5 percentage points.