Research Of Low Temperature And Controlled Atmosphere Storage Technology On SNAP Bean

Snap beans (Phaseolus vulgaris L.) were taken as experiment material to investigate the preservation effect of different maturity, different storage temperatures, modified atmosphere storage conditions, controlled atmosphere storage conditions and controlled atmosphere of low temperature combined with 1-MCP treatments. Analysis physiological and biochemical index change in the process of storage and explore the inner link of control measures and snap beans storage appeared in the process of chilling injury, rusty spot and aging in order to improve storage effect and extend to provide theoretical basis.It is the best of storage effect into 7-8 medium maturity, by means of measuring the storage quality of snap beans in different maturity draw best storage effect. Appropriate maturity of pods quality to maintain and oxidation suppression have an active role in aging and significantly improve the storability of snap beans.Snap beans juice freezing temperature was 0.64℃ and cold spot was 2.26 ℃. It appeared chilling injury symptoms of water immersion shape and rusty spot in 0℃ after storage 20 days. The best storage temperature was 8.00±1.00℃. It is helpful for each quality and physiological indicators of maintain in storage period in appropriate low temperature to delayed the pod respiratory peak arrival.The paper focused on effects of different fresh-keeping films on gas concentrations and storage qualities of snap beans. The results showed that 0.02mm polyethylene film was the best. The gases balance concentration in 0.02mm polyethylene bags is O219.20% and CO22.10%. It maintained fruit respiratory rate at low range between 82-117 CO2mg/kg-h, delayed the fruit mature the aging process and extended the storage life.It was found that controlled atmosphere storage have obvious preservation effect. The treatment combined O22.5±0.5%with CO25±0.5%restrained pod yellowing and declined weight loss rate, decay rate and rusty spot index at 8.00±1.00℃.The process of integrated control technology was treatment with O22.5±0.5%, CO25±0.5%, relative humidity about 90-95% and storage at 8.00+1.00℃. After 50 days storage weight-loss rate 19.8%, spot rate 22.3%, cellulose 15.6%, DPPH-radical scavenging activity 45.1% and chlorophyll 39.8mg/100g.