食品科学 ›› 2010, Vol. 31 ›› Issue (10): 216-218.doi: 10.7506/spkx1002-6630-201010045

• 分析检测 • 上一篇    下一篇

酸度计法快速检测牛奶中残留的β-内酰胺酶

刘珊珊1,周 正2,周 巍2,张子德1,马俊莲1 ,*   

  1. 1.河北农业大学食品科技学院 2.河北省食品质量监督检验研究院
  • 收稿日期:2009-10-28 修回日期:2010-03-17 出版日期:2010-05-15 发布日期:2010-12-29
  • 通讯作者: 马俊莲 E-mail:zhangzde@heinfo.net
  • 基金资助:

    河北省科学技术研究与发展计划项目(09227114D)

Use of An Acid Meter for the Rapid Determination of β-Lactamase Residue in Milk

LIU Shan-shan1,ZHOU Zheng2,ZHOU Wei2,ZHANG Zi-de1,MA Jun-lian1,*   

  1. 1. College of Food Science and Technology, Agricultural University of Hebei, Baoding 071001, China;
    2. Hebei Institute of Food Quality Supervision Inspection and Research, Shijiazhuang 050051, China
  • Received:2009-10-28 Revised:2010-03-17 Online:2010-05-15 Published:2010-12-29
  • Contact: MA Jun-lian E-mail:zhangzde@heinfo.net

摘要:

为了快速、准确地检测牛奶制品中残留的β- 内酰胺酶的含量,利用β- 内酰胺酶分解青霉素产酸使牛奶pH 值下降的原理,对人工添加了β- 内酰胺酶的牛奶制品与青霉素反应后pH 值的下降规律进行研究。得到牛奶中残留的β- 内酰胺酶与青霉素反应的较适宜条件,从而获得快速检测牛奶制品中残留的β- 内酰胺酶的方法。结果确定牛奶制品中残留的β- 内酰胺酶与青霉素反应的适宜条件为温度33℃、底物质量浓度10mg/mL,检测时间仅为60min。此方法对液态纯牛奶中β- 内酰胺酶的最低检出限为8.92U/mL。

关键词: pH值, β-内酰胺酶, 牛奶, 青霉素, 检测

Abstract:

The principle that β-lactamase selectively decomposes β-lactam antibiotics like penicillin into acids leading to pH decline was considered to present a rapid and accurate method for the determination of β-lactamase residue in milk. β- Lactamase at a constant final concentration of 100 U/mL and penicillin were artificially added to antibiotic free milk and left to react for a certain period of time at an appropriate temperature. The optimal penicillin final concentration and reaction time and temperature were determined to be 10 mg/mL, 60 min and 33 ℃, respectively. The developed method exhibited a limit of detection of 8.92 U/mL.

Key words: pH value, β-lactamase, milk, penicillin, determination

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