Study On Shelf-keeping Effect Of CO₂ Gas Regulator Combined With ClO₂ On Broccoli

Because of its nutrition,it is welcomed by people.How to keep fresh has become the main goal of researchers at home and abroad.Objective in order to solve the problem that the traditional air conditioning preservation technology can not be used in the process of logistics transportation,this experiment mainly discusses the feasibility of different concentrations of carbon dioxide in the application of broccoli preservation of chlorine dioxide was used to inhibit the mildew of broccoli.Methods The newly picked broccoli with uniform size and no tissue damage was transported to the laboratory by adding ice into the foam box to remove the ice and dry the moisture in the broccoli gap.The broccoli was treated differently by precooling 24h,The foam box was sealed with tape to form a closed microenvironment.Some studies have shown that more than 12%of the CO₂are considered to be excessive and damaged,and the initial pre-experiment results also show that 15%CO₂the treatment effect is not as good as 12%CO₂the treatment group.Therefore,the treatment component is CK?1-MCP?4%CO₂?8%CO₂?12%CO_2,ice,and the concentration of CO₂is adjusted by release agent.There are five cases in each treatment,one box is opened every day,and the color difference,weight loss rate and conductivity of each treatment group are determined every day.The remaining samples are wrapped in tin paper and added liquid nitrogen,which is stored in a refrigerator-80?for the determination of Vc,chlorophyll and chlorophyll related enzymes.The preservation effect of different treatment groups was analyzed.In view of the moldy phenomenon of broccoli buds in the later stage of shelf,nine cases of broccoli were selected in three treatment groups.On the basis of air conditioning,the mildew of broccoli was inhibited by slow release of chlorine dioxide.The related indexes were determined.Conclusion Compared with the control group,the treatment group had different effects on the fresh-keeping effect of broccoli,of which 12%CO₂the treatment effect was the best,followed by the ice treatment group.With the extension of shelf life,on the third and fourth days of the shelf,it is obvious that 12%CO₂treatment group appear more green than other treatment groups,The chlorophyll a content of broccoli in the control group was 9.8U/L on the fourth day,12%CO₂and the chlorophyll a content was 14.68 U/L.on the fourth day The content of chlorophyll b in 12%CO₂treatment group on the fourth day of shelf is about 3/2times that of the control group.For other related indexes,the results also showed that 12%CO₂treatment group was significantly better than other treatment groups.Experiments show that the proper air conditioning effect is better than that of the control group and slightly better than that of the ice treatment group.The longer the shelf life,the more obvious the advantage of air conditioning treatment is.In view of the late shelf broccoli surface appeared a slight mildew phenomenon.Subsequent tests show that,on the basis of air conditioning,The slow release of 0.15g/dm³chlorine dioxide can inhibit the mildew of broccoli.Six days after sealing treatment,the conductivity value showed obvious difference,CK(ice)conductivity value was 15.51.12CO₂treatment conductivity value was 13.25.12%CO₂and 0.15 g/dm3Cl O₂combined treatment broccoli conductivity value was 11.56.shelf life CK(ice-added)conductivity values significantly greater than 12%CO₂combined with 0.15 g/dm³Cl O₂treatment.In the whole test process,the shelf observation is carried out for a period of time in order to simulate the change of broccoli in logistics and sales process,and to provide theoretical support for the subsequent treatment of broccoli in logistics transportation.