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Microchimica Acta

, 186:27 | Cite as

A liquid crystal based method for detection of urease activity and heavy metal ions by using stimulus-responsive surfactant-encapsulated phosphotungstate clusters

  • Lubin Qi
  • Qiongzheng Hu
  • Qi Kang
  • Li Yu
Original Paper
  • 110 Downloads

Abstract

A liquid crystal (LC) based method is described for the sensitive determination of the activity of urease and of heavy metal ions which acts as inhibitors. Stimulus-responsive surfactant-encapsulated phosphotungstate clusters (SECs) were fabricated and deposited onto octadecyltrichlorosilane-coated glass. A copper TEM grid filled with LCs was placed on the substrate to construct the LC optical cell. Upon addition of water to the LC interface, the optical appearance of LCs on the glass undergoes a bright-to-dark shift due to an orientational transition of the LCs from a planar to a homeotropic state. However, the LCs display a bright appearance if they are pretreated with an aqueous solution containing urea and urease. This is caused by the disassemby of the SECs from the glass surface due to an increase of the pH value that is induced by the enzymatic hydrolysis of urea by urease. The method is highly sensitive and can detect urease activities as low as 0.03 mU/mL. It can also be applied to the determination of heavy metal ions which exert an inhibitory effect on the activity of urease. For example, Cu(II) can be quantified via urease inhibition in 1 nM concentration.

Graphical abstract

Schematic presentation of a liquid crystal-based sensor for detection of urease and heavy metal ions by using stimulus-responsive surfactant-encapsulated phosphotungstate clusters.

Keywords

Liquid crystal Sensor layer Urease Stimulus-responsive material Nanocomposites Ionic liquid Surfactant Polyoxometalates Ionic self-assembly 

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 21373128), Scientific and Technological Projects of Shandong Province of China (No. 2018GSF121024).

Compliance with ethical standards

The author(s) declare that they have no competing interests.

Supplementary material

604_2018_3132_MOESM1_ESM.doc (13.7 mb)
ESM 1 (DOC 14074 kb)

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Key Laboratory of Colloid and Interface Chemistry, Ministry of EducationShandong UniversityJinanPeople’s Republic of China
  2. 2.Department of ChemistryUniversity of WashingtonSeattleUSA
  3. 3.College of Chemistry, Chemical Engineering and Materials ScienceShandong Normal UniversityJinanPeople’s Republic of China

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