Visual quantification of melamine using citrate-capped gold nanoparticles

Na Li, Lu Yu, Thien Van Tran, Jia Qi Zou

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Due to its high nitrogen content and low cost, melamine, a widely used material in plastics industry, has been illegally added to food products to boost apparent protein content. We've previously developed a colorimetric method to detect melamine. This method utilizes the melamine-concentration dependent gradual color shift of gold nanoparticles (AuNPs) and an absorbance reader is usually required for reliable quantification of melamine. Herein, we present a novel strategy for reliable visual quantification of melamine without any equipment. First of all, we further explored the mechanism of the melamine-induced AuNP aggregation with various experimental techniques. Secondly, based on the findings from the mechanism studies, we've developed and demonstrated a critical coagulation concentration (CCC)-based salt titration as a reliable means to visually quantify the melamine. This has allowed us to accurately quantify melamine at a level as low as 30 ppb without any equipment.

Original languageEnglish (US)
Title of host publicationTechnical Proceedings of the 2013 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2013
Pages139-142
Number of pages4
StatePublished - Aug 9 2013
EventNanotechnology 2013: Bio Sensors, Instruments, Medical, Environment and Energy - 2013 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2013 - Washington, DC, United States
Duration: May 12 2013May 16 2013

Publication series

NameTechnical Proceedings of the 2013 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2013
Volume3

Other

OtherNanotechnology 2013: Bio Sensors, Instruments, Medical, Environment and Energy - 2013 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2013
CountryUnited States
CityWashington, DC
Period5/12/135/16/13

Keywords

  • Colorimetric
  • Critical coagulation concentration
  • Gold nanoparticles
  • Melamine

ASJC Scopus subject areas

  • Biotechnology

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  • Cite this

    Li, N., Yu, L., Van Tran, T., & Zou, J. Q. (2013). Visual quantification of melamine using citrate-capped gold nanoparticles. In Technical Proceedings of the 2013 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2013 (pp. 139-142). (Technical Proceedings of the 2013 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2013; Vol. 3).