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

中文关键词:  青见柑橘  低压静电场  臭氧  贮藏  品质变化

英文关键词:Citrus unshiu×sinensis  low voltage electrostatic field  ozonation  storage  quality change

中文摘要:

      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/m3, 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T2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。

英文摘要:

      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/m3, 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 T2 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.