食品科学 ›› 2018, Vol. 39 ›› Issue (15): 101-107.doi: 10.7506/spkx1002-6630-201815015

• 食品工程 • 上一篇    下一篇

低温等离子体对蓝莓果实的杀菌效果及对其品质的影响

王 卓,周丹丹,彭 菁,屠 康*,马佩沛   

  1. 南京农业大学食品科技学院,江苏 南京 210095
  • 出版日期:2018-08-15 发布日期:2018-08-15
  • 基金资助:
    国家自然科学基金面上项目(31671925);江苏省产学研前瞻性联合研究项目(BY2015071-05)

Efficacy of Cold Plasma on Microbial Decontamination and Storage Quality of Blueberries

WANG Zhuo, ZHOU Dandan, PENG Jing, TU Kang*, MA Peipei   

  1. College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
  • Online:2018-08-15 Published:2018-08-15

摘要: 目的:探究低温等离子体对蓝莓表面的杀菌作用及对其常温贮藏品质的影响。方法:利用介质阻挡放电低 温等离子体在45 kV工作电压下处理‘灿烂’蓝莓50 s,于20 ℃、相对湿度85%条件下贮藏8 d,每隔1 d检测蓝莓表 面微生物菌落总数、品质指标和抗氧化酶活力。结果:低温等离子体处理能使蓝莓表面细菌和真菌数量分别下降 1.75(lg(CFU/g))和1.77(lg(CFU/g)),可显著抑制贮藏期间腐烂的发生,抑制蓝莓硬度和VC含量的下降, 抑制贮藏后期可滴定酸质量分数的上升,提高抗氧化酶活力,对抗氧化能力等无显著影响。结论:低温等离子体通 过其杀菌作用,降低了蓝莓腐烂的发生,同时诱导了蓝莓抗氧化酶活力,有利于提高蓝莓贮藏期间的品质。

关键词: 低温等离子体, 蓝莓, 杀菌, 采后品质, 贮藏

Abstract: Objective: The goal of this study was to test the efficacy of cold plasma (CP) for microbial decontamination of blueberries and to investigate the influence of CP on the storage quality of blueberries. Methods: “Brilliant” blueberries were treated with atmospheric CP generated with a 45 kV dielectric barrier discharge (DBD) generator for 50 s. Microbial populations on blueberries, quality indexes and antioxidant enzyme activities were assessed every two days during a storage period of 8 days (20 ℃, 85% RH). Results: Total aerobic mesophilic bacteria and yeast/mold counts were effectively decreased by 1.75 (lg(CFU/g)) and 1.77 (lg(CFU/g)) after cold plasma treatment, respectively. Meanwhile, cold plasma treatment positively affected the quality of blueberries by reducing decay incidence, maintaining fruit firmness and VC content, preventing the increase of titratable acidity at the late stage of storage and increasing the antioxidant enzyme activities. Other qualitative parameters for antioxidant ability were only slightly affected by the treatment. Conclusion: Cold plasma can reduce decay incidence on blueberries. Furthermore, it can induce the antioxidant enzyme activities and improve the storage quality of blueberries.

Key words: cold plasma, blueberry, microbial decontamination, postharvest quality, storage

中图分类号: