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Analytical and Bioanalytical Chemistry

, Volume 405, Issue 1, pp 341–349 | Cite as

Determination of t,t-muconic acid in urine samples using a molecular imprinted polymer combined with simultaneous ethyl chloroformate derivatization and pre-concentration by dispersive liquid–liquid microextraction

  • Mohana Krishna Reddy MudiamEmail author
  • Abhishek Chauhan
  • Krishna P. Singh
  • Shailendra K. Gupta
  • Rajeev Jain
  • Ratnasekhar Ch
  • R. C. Murthy
Original Paper

Abstract

The present communication describes the preparation and evaluation of a molecularly imprinted polymer (MIP) as a solid-phase extraction (SPE) sorbent and simultaneous ethyl chloroformate (ECF) derivatization and pre-concentration by dispersive liquid–liquid microextraction (DLLME) for the analysis of t,t-muconic acid (t,t-MA) in urine samples using gas chromatography–mass spectrometry. The imprinting polymer was prepared using methacrylic acid as a functional monomer, ethylene glycol dimethacrylate as a cross-linker, 2,2-azobisisobutyronitrile as the initiator and t,t-MA as a template molecule. The imprinted polymer was evaluated for its use as a SPE sorbent by comparing both imprinted and non-imprinted polymers in terms of the recovery of t,t-MA from urine samples. Molecular modelling studies were performed in order to estimate the binding energy and efficiency of the MIP complex formed between the monomer and the t,t-MA. Various factors that can affect the extraction efficiency of MIP, such as the loading, washing and eluting conditions, were optimized; other factors that can affect the derivatization and DLLME pre-concentration were also optimized. MIP in combination with ECF derivatization and DLLME pre-concentration for t,t-MA exhibits good linearity, ranging from 0.125 to 2 μg mL−1 (R 2 = 0.9971), with limit of detection of 0.037 μg mL−1 and limit of quantification of 0.109 μg mL−1. Intra- and inter-day precision was found to be <6 %. The proposed method has been proven to be effective and sensitive for the selective pre-concentration and determination of t,t-MA in urine samples of cigarette smokers.

Figure

Graphical abstract for t,t-muconic acid analysis by using MISPE-DLLME followed by GC-MS analysis

Keywords

Muconic acid Molecularly imprinted polymers Gas chromatography–mass spectrometry Molecular modelling Ethyl chloroformate Dispersive liquid–liquid microextraction 

Notes

Acknowledgments

The authors are thankful to Dr. K.C. Gupta, Director, CSIR-IITR, Lucknow, for his suggestions and constant support. AC and RJ are thankful to UGC, New Delhi; R Ch is thankful to CSIR, New Delhi, for providing research fellowship. The authors acknowledge the financial support from OLP-0004 (CSIR-EMPOWER scheme).

Supplementary material

216_2012_6474_MOESM1_ESM.pdf (996 kb)
ESM 1 (PDF 996 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Mohana Krishna Reddy Mudiam
    • 1
    Email author
  • Abhishek Chauhan
    • 1
  • Krishna P. Singh
    • 2
  • Shailendra K. Gupta
    • 2
  • Rajeev Jain
    • 1
  • Ratnasekhar Ch
    • 1
  • R. C. Murthy
    • 1
  1. 1.Analytical Chemistry SectionCSIR—Indian Institute of Toxicology ResearchLucknowIndia
  2. 2.System ToxicologyCSIR—Indian Institute of Toxicology ResearchLucknowIndia

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