Food Analytical Methods

, Volume 7, Issue 10, pp 1992–2002

Highly Broad-Specific and Sensitive Enzyme-Linked Immunosorbent Assay for Screening Sulfonamides: Assay Optimization and Application to Milk Samples

  • Xiao Liang
  • Hengjia Ni
  • Ross C. Beier
  • Yanni Dong
  • Jingya Li
  • Xiangshu Luo
  • Suxia Zhang
  • Jianzhong Shen
  • Zhanhui Wang
Article

DOI: 10.1007/s12161-014-9845-3

Cite this article as:
Liang, X., Ni, H., Beier, R.C. et al. Food Anal. Methods (2014) 7: 1992. doi:10.1007/s12161-014-9845-3

Abstract

The optimum conditions of an enzyme-linked immunosorbent assay (ELISA) in regard to different monoclonal antibodies (MAbs), assay format, immunoreagents, and several physicochemical factors (pH, salt, detergent, and solvent) were investigated to develop a broad-specific and sensitive immunoassay for detection of sulfonamides in milk samples. Two previously produced broad-specific MAbs, 4D11 and 4C7, and eight structurally different haptens conjugated with bovine serum albumin (BSA) were used as coating antigens in a competitive indirect ELISA (ciELISA). In addition, six hapten-HRP conjugates and the two MAbs were evaluated in a competitive direct ELISA. After optimization, a highly broad-specific and sensitive ciELISA for screening for sulfonamides was obtained based on MAb 4D11 and the BS-BSA heterologous-coating antigen, demonstrating a 50 % specific binding (IC50) for 22 sulfonamides at concentrations below 100 ng mL−1. This is the first report of an immunoassay that is capable of detecting more than 20 sulfonamides based on MAbs. The optimized ciELISA was used to quantify the five sulfonamides, SMZ, SDM, SQX, SMM, and SMX in spiked milk samples. Recoveries of 89–104.6 % and coefficients of variation of 11.9–19.1 % demonstrated the potential of the ciELISA to simultaneously monitor multiple sulfonamides in diluted milk samples without further purification steps.

Keywords

Broad-specificityELISAMilkOptimizationSulfonamides

Supplementary material

12161_2014_9845_MOESM1_ESM.doc (260 kb)
ESM 1(DOC 260 kb)

Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Xiao Liang
    • 1
  • Hengjia Ni
    • 1
  • Ross C. Beier
    • 2
  • Yanni Dong
    • 1
  • Jingya Li
    • 1
  • Xiangshu Luo
    • 1
  • Suxia Zhang
    • 1
  • Jianzhong Shen
    • 1
  • Zhanhui Wang
    • 1
  1. 1.College of Veterinary MedicineChina Agricultural University, Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, Beijing Laboratory For Food Quality and SafetyBeijingPeople’s Republic of China
  2. 2.Food and Feed Safety Research UnitSouthern Plains Agricultural Research Center, Agricultural Research Service, United States Department of AgricultureCollege StationUSA