中国农业科学 ›› 2019, Vol. 52 ›› Issue (21): 3903-3923.doi: 10.3864/j.issn.0578-1752.2019.21.018

• 食品科学与工程 • 上一篇    下一篇

超高压和高温短时杀菌对NFC苹果汁贮藏期品质的影响

邓红1,2,3,雷佳蕾1,杨天歌1,刘旻昊1,孟永宏1,2,3(),郭玉蓉1,2,3,薛佳1,2,3()   

  1. 1 陕西师范大学食品工程与营养科学学院,西安 710119
    2 国家苹果加工技术研发专业中心,西安 710119
    3 西部果品资源高值利用教育部工程研究中心,西安 710119
  • 收稿日期:2019-04-29 接受日期:2019-09-03 出版日期:2019-11-01 发布日期:2019-11-12
  • 通讯作者: 孟永宏,薛佳
  • 作者简介:邓红,Tel:029-85310517;E-mail: hongden@snnu.edu.cn
  • 基金资助:
    国家重点研发计划(2017YFD0400700);农业部苹果产业体系项目(CARS-28)

Effect of Ultra-High Pressure and High Temperature Short-Time Sterilization on the Quality of NFC Apple Juice During Storage

DENG Hong1,2,3,LEI JiaLei1,YANG TianGe1,LIU MinHao1,MENG YongHong1,2,3(),GUO YuRong1,2,3,XUE Jia1,2,3()   

  1. 1 College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi’an 710119;
    2 National Research & Development Center of Apple Processing Technology, Xi’an 710119;
    3 Engineering Research Center of High Value Utilization of Western China Fruit Resources, Ministry of Education, Xi’an 710119;
  • Received:2019-04-29 Accepted:2019-09-03 Online:2019-11-01 Published:2019-11-12
  • Contact: YongHong MENG,Jia XUE

摘要:

目的 通过比较两种不同杀菌处理(高温短时High temperature short-time和超高压Ultra-high pressure杀菌)的非浓缩还原(Not from concentrate,NFC)苹果汁贮藏期品质变化,为我国NFC果汁产品标准的制定和规范市场NFC果汁产品货架期提供试验依据。方法 以‘红富士’苹果为原料制备NFC苹果汁,采用高温短时杀菌(HTST,98℃,50 s)和超高压杀菌(UHP,400 MPa,15 min)处理后,在4℃条件下冷藏,利用微生物学、化学及主成分分析(PCA)等方法以及HPLC、GC-MS等手段研究两种不同杀菌处理的NFC苹果汁贮藏期微生物、理化指标、多酚含量、酶(Polyphenol oxidase,PPO;Peroxidase,POD)活性、抗氧化活性、香气成分的变化。结果 HTST和UHP处理对细菌总数、大肠杆菌、霉菌与酵母的杀菌率均为100%,但贮藏第10、5周时果汁菌落总数分别呈显著增加(89.15%、58.65%),大肠杆菌、霉菌与酵母增殖速度不明显;贮藏期HTST和UHP两种处理NFC苹果汁微生物种群变化小,但优势菌属不同。两种处理的NFC苹果汁贮藏期可溶性固形物、pH、总酸的变化不大,但总色差显著增大(P<0.05);贮藏期HTST和UHP处理NFC苹果汁中表儿茶素分别下降了33%和53%,FRAP总抗氧化能力和DPPH自由基清除率分别保持在76%、73%和77%、76%,HTST处理NFC苹果汁的多酚含量和抗氧化活性明显高于UHP处理的样品;HTST处理后贮藏期NFC苹果汁的PPO与POD完全失活,但UHP处理样品的酶活性呈现先增大后降低的趋势。HTST处理后果汁18种特征香味物质总的保留率为52%,但贮藏期香气成分保持稳定;UHP处理NFC苹果汁的香气含量(57.75 mg/100 mL)接近对照样品(57.17 mg/100 mL),但贮藏期香气成分变化显著,降低了26.13%。结论 HTST和UHP杀菌处理的NFC苹果汁在4℃可分别贮藏9、4周,贮藏期内其品质满足商业要求,HTST处理NFC苹果汁货架期长于UHP处理。

关键词: NFC苹果汁, 超高压处理, 高温短时灭菌, 品质, 贮藏期

Abstract:

【Objective】 In order to provide an experimental basis for regulating the shelf life of not from concentrate (NFC) juice products in Chinese market and formulating standard of NFC juice products in China, the quality changes of NFC apple juice treated by different sterilization methods (e.g., high temperature short-time (HTST) and Ultra-high pressure (UHP)) during storage periods were compared. 【Method】 NFC apple juice was prepared by using Fuji apple as raw material and treated by HTST at 98℃ for 50 s and UHP at 400 MPa for 15 min, respectively, before refrigerated at 4℃. Then the changes of microbial, physical and chemical indicators, polyphenols, enzymes (polyphenol oxidase and peroxidase) activity, antioxidant activity and aroma components were studied using various methods (e.g., microbial and chemical methods, principal component analysis (PCA), instrumental analysis methods of HPLC, and GC-MS). 【Result】 The sterilization rates of total bacteria, Escherichia coli, mold and yeast in NFC apple juice were 100% through HTST and UHP treatment, however, the total number of colonies increased significantly (89.15%, 58.65%) at the 10 th and 5 th week of storage, respectively. No obvious proliferation of Escherichia coli, mold and yeast was observed. The microbial communities of NFC apple juice treated by HTST and UHP during storage were of no significant changes, but the increases of dominant bacteria were different. The TSS, pH, TA, and the sensory quality (storage for 4 and 8 weeks) of NFC apple juices treated by HTST and UHP did not change significantly, but not the total color significantly (P<0.05). During the storage period, the content of epicatechin in NFC apple juice treated by HTST and UHP decreased by 33% and 53%, respectively. The total antioxidant capacity of FRAP, scavenging rate of DPPH free radical were kept at 76%, 73%, and 77%, 76%, respectively. PPO and POD of NFC apple juice were completely inactivated after HTST treatment, but the enzymes activity (PPO and POD) in samples processed by UHP showed a trend of first increasing and then decreasing. The polyphenol content and antioxidant activity of HTST treated NFC apple juice were significantly higher than those of UHP treated samples. The total retention rate of 18 characteristic aroma substances in HTST treated NFC apple juice was 52%, but the aroma components remained stable during storage. In contrast, the aroma content of UHP treated NFC apple juice (57.75 mg/100 mL) was close to the control sample (57.17 mg/100 mL), but the aroma components significantly changed and reduced by 26.13% during storage. 【Conclusion】 NFC apple juice with HTST and UHP sterilization could maintain the commercial quality stored at 4℃ for 9 and 4 weeks, respectively, but the shelf life of HTST treated NFC apple juice was longer than that treated by UHP.

Key words: NFC apple juice, ultra-high-pressure treatment, high-temperature short-time sterilization, quality, storage period