| China is the largest producer and exporter of canned citrus in the world.Its output accounts for more than 80%of the total output of Citrus cans in the world,of which more than 60%of them are exported,and exports to the United States account for more than 60%of the total export volume.The US FDA stipulates that the limit of carbendazim in citrus products is 0.01mg·kg-1,while the pesticide residue limit in China is 5mg·kg-1.Due to the difference of standard,the export trade of Citrus canned has been influenced.In this paper,the changes of carbendazim residues in canned citrus processing were studied.Ozone and low-temperature plasma technology were used to treat carbendazim residues of citrus cans,and the effect of the degradation method on canned quality was studied.Provides scientific basis for controlling carbendazim residues of citrus cans.(1)The effects of different processing conditions on the removal rate of carbendazim in the prenatal,middle and postpartum pesticide residues were studied.Sampling in citrus cans at different times of processing to detect the content of carbendazim in orange balls.The results showed that the residual amount of carbendazim in citrus treated with carbendazim increased and then decreased with the storage time.In the process of canning,the degradation rate of carbendazim could be 42%-94%,the acid process ocan remove the carbendazim content of original fruit was removed 37.5±1.6%,in alkali treatment,the maximum removal rate of carbendazim up to 58.7±1.8%;Increase in processing,acid and alkali treatment and rinse water can increase the removal rate of carbendazim;in the processed canned products carbendazim residue remained stable.The results showed that the process of canning of citrus could effectively remove carbendazim from citrus flesh,and the content of carbendazim in citrus raw material could be basically guaranteed to reach the export standard by the process of canning.(2)Studied for the degradation of carbendazim residue in canned citrus by ozone and low temperature plasma.Carbendazim residues in canned citrus decreased with the increase of raw materials,water consumption and the temperature of treatment;With the increasing of processing time,it showed a downward trend.Response surface methodology(RSM)was used to optimize the treatment process.The order of the factors affecting the degradation rate was temperature,time and solid-liquid ratio.The optimum conditions for ozone degradation of carbendazim in citrus was temperature 1℃,the solid-liquid ratio was 1:4,the time was 15 min and the degradation rate of carbendazim was 91.48%but the optimum conditions for low temperature plasma degradation of carbendazim was temperature 0℃,the solid-liquid ratio was 1:5,the time was 14 min,and the degradation rate of carbendazim was 92.12%.(3)The effects of ozone and low temperature plasma on the nutrition and sensory indexes of canned products and products in the storage process were studied.Ozone/low temperature plasma treatment could reduce the content of VC,flavonoids and carotenoids in citrus canisters.Compared with the untreated blank,the three substances in ozone treatment decreased by 26.70%,4.47%,4.35%,and the low-temperature plasma decreased by 11.56%,7.39%and 7.95%.The pulp of the product processed by low temperature plasma became deep.The contents of soluble solids,total sugar,reducing sugar and titratable acid did not change significantly.Ozone and low-temperature plasma treatment did not affect the commercial properties of citrus cans significantly.The study on the degradation of carbendazim in the processing of citrus cans and the degradation of carbendazim by ozone and low-temperature plasma technology show that the process and ozone/low temperature plasma can remove 95%-99%carbendazim,that is,when the carbendazim residue in the citrus material is less than 1.9mg·kg-1,the product can meet the export standard through the corresponding removal method and dosen’t affect the commercial properties of the citrus can. |
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