Research On Pulse Type Anti-mould Technology And Equipment Of The Mass And Temperature Separate Controlled Storage

Mould was the main reason causing fruits and vegetables spoilage during the later storage period. The prevention of mould depended mainly on fresh-keeping agents at the present stage. Either the immersion type preservative or the fumigation type preservative could effectively inhibit the growth and reproduction of mould, but lead to high residue and quality damage inevitably. As the accessory technology and equipment of the Mass and Temperature Separate Controlled Storage (MTSCS), the Pulse Type Anti-mould Technique(PTAT) was a novel kind of intermittent fumigation method for fruits and vegetables. It could reduce the residual and relieved the injury symptoms as while resisting mould.The release and distribution rule of two different dosage forms preservatives were investigated in the PTAT experimental platform. Moreover, the effects of mouldproof and preservation on cherry tomato treated with two preservatives were studied. On this basis,the paper revealed the optimal concentration and injury threshold, and then proved the performance of PTAT to confirm the best intermittent fumigation method. These results provided theoretical basis for the in-depth study of PTAT.Firstly, the equilibrium time of ClO2 tablet at different temperature was found through determination of release rate. ClO2 tablet at 0, 5, 10, 25 ℃ reached equilibrium after 90,90, 60, 45 min, respectively. At this time the value of release rate was 6.73, 6.88, 6.77,6.67%. It was found that gaseous ClO2 at measuring point 1#, 2#, 3# in the store distributed equally after 20, 15, 15 min in the light of concentration variation under different temperature. Among these measuring points, point 3# with less fluctuation of ClO2 was applicable for goods stacking.Secondly, the quality changes of cherry tomato fumigated with different ClO2 concentrations were observed. It was found that treatment with 30 g/m3 ClO2 could inhibit the growth and reproduction of mould and reduced decay rate significantly, postponed quality deterioration and relieved loss of flavor. Therefore, it was taken as the optimal concentration. Treatment with 40 g/m3 ClO2, regarded as injury threshold, had the lowest mold counting and decay rate, but caused fruit damage.Moreover, changes on cherry tomato intermittently fumigated with different ClO2 concentrations were also investigated. Compared with the conventional fumigation,fumigation at 5-day intervals had better fruit quality, which could be considered the best intermittent fumigation approach. In the same way, fumigation at 3-day intervals had excellent hygienic quality. However, the interval was too short to bring fruit serious injury.Furthermore, changes on SO2 concentration at different measuring points were determined under different temperature. It appeared that gaseous SO2 at measuring point 1#,2#, 3# in the store distributed equally after 20, 15, 20 min. Among these measuring points,point 3# with less fluctuation of SO2 was applicable for goods stacking.Additionally, the quality changes of cherry tomato fumigated with different SO2 concentrations were observed. Treatment with 600 μL/L SO2 could inhibit the growth and reproduction of mould, and fruit had favourable storage quality. Therefore, it was taken as the optimal concentration. Although treatment with 800 μL/L SO2 had the best hygienic quality, it led serious fruit injury.Finally, changes on cherry tomato intermittently fumigated with different SO2 concentrations were also investigated. Compared with the conventional fumigation,fumigation at 5-day intervals had better fruit quality, which could be considered the best intermittent fumigation approach. Although fumigation at 3-day intervals had excellent hygienic quality, it brought fruit serious injury.