臭氧处理协同低压静电场对青见柑橘低温贮藏品质的影响

Effects of ozone treatment combined with low voltage electrostatic field on the quality of Citrus unshiu×sinensis during cold storage

目的探究臭氧处理联合低压静电场(low voltage electrostatic field,LVEF)对青见柑橘的保鲜效果。方法青见柑橘随机分为臭氧组(4.0 mg/m^(3),30 min)、LVEF组(2400 V,5 mA)、臭氧+LVEF组和对照组(control check,CK),4℃冷藏。测定其贮藏期间水分含量、可滴定酸(titratable acid,TA)、可溶性糖含量、可溶性固形物含量(soluble solid content,SSC)、维生素C(vitamin C,VC)含量、硬度和水分迁移情况变化。结果贮藏期间,各组青见柑橘TA、VC含量、硬度、水分含量均呈下降趋势,可溶性糖含量、SSC呈先上升后下降趋势,腐烂率呈上升趋势,且臭氧+LVEF组对于青见柑橘贮藏品质的维持效果显著优于CK组、臭氧组和LVEF组(P<0.05)。此外,臭氧组和LVEF组对青见柑橘贮藏品质的维持效果均显著优于CK组,而LVEF组对青见柑橘贮藏品质维持效果显著低于臭氧组(P<0.05)。横向弛豫时间T_(2)反演谱结果显示,与新鲜样品相比,贮藏至40 d的青见柑橘的结合水无显著性变化,不易流动水含量有所上升,自由水含量显著下降,臭氧处理联合LVEF保鲜可显著抑制青见柑橘自由水含量的减少(P<0.05)。结论贮藏期间,臭氧处理、LVEF贮藏和臭氧处理联合LVEF均能抑制青见柑橘品质的劣化且臭氧处理+LVEF效果最好。

Objective To explore the fresh-keeping effect of ozone treatment combined with low voltage electrostatic field(LVEF)on Citrus unshiu×sinensis during cold storage.Methods Citrus unshiu×sinensis with the same size were randomly divided into ozone group(4.0 mg/m^(3),30 min),low-voltage electrostatic field group(2400 V,5 mA),ozone+LVEF group and control check(CK)group,refrigerated at 4℃.Changes in moisture content,titratable acid(TA),soluble sugar,soluble solids content(SSC),vitamin C(VC)content,hardness and moisture migration during storage were determined.Results During the cold storage,the TA,soluble sugar content,VC content,hardness and moisture content of Citrus unshiu×sinensis in each group showed a downward trend,when the soluble sugar content and SSC increased first and then decreased,when the rotting rate showed an upward trend,and the maintenance effect of ozone+LVEF group of Citrus unshiu×sinensis on storage quality was significantly better than CK group,ozone group and LVEF group(P<0.05).In addition,the maintenance effect of ozone group and LVEF group of Citrus unshiu×sinensis on storage quality was significantly better than that of CK group,while the effect of LVEF group on maintaining quality of Citrus unshiu×sinensis storage was significantly lower than that of ozone group(P<0.05).The inversion spectrum of transverse relaxation time T_(2) showed that compared with the fresh samples,the bound water of Citrus unshiu×sinensis preserved for 40 d had no significant change,the content of free water did not increase,but the content of free water decreased significantly.Ozone treatment+LVEF could significantly inhibit the reduction of free water content in Citrus unshiu×sinensis(P<0.05).Conclusion During the storage period,ozone treatment,LVEF storage and ozone treatment combined with LVEF can inhibit the quality deterioration of Citrus unshiu×sinensis,and the effect of ozone treatment+LVEF is the best.