Biofunctionalized silver nanoparticles as a novel colorimetric probe for melamine detection in raw milk

Hemant P. Borase, Chandrashekhar D. Patil, Rahul B. Salunkhe, Rahul K. Suryawanshi, Bipinchandra K. Salunke, Satish V. Patil

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


Nanoparticles have emerged as a promising analytical tool for monitoring food adulteration and safety. In the present study, silver nanoparticles (AgNPs) were synthesized using leaves' extract of Jatropha gossypifolia. AgNPs revealed a characteristic surface plasmon resonance (SPR) peak at 419 nm and have spherical and grain shape with size range between 18 and 30 nm. A selective and rapid method of melamine detection in raw milk was developed with the use of these biofunctionalized AgNPs. The color change, deviation in SPR spectra, and change in the absorption ratio (A500/A419) of AgNPs occurred after an AgNPs-melamine interaction. The detection limit for melamine up to 2 μM (252 ppb) was attained with this method, which is quite lower than safety level recommendations of regulatory bodies demonstrating sensitivity of the method. Dynamicx light scattering and transmission electron microscopy analyses exhibited an increase in hydrodynamic diameter and size of AgNPs after melamine interaction. Melamine sensing by AgNPs was investigated by different physicochemical and thermal analyses.

Original languageEnglish
Pages (from-to)652-662
Number of pages11
JournalBiotechnology and Applied Biochemistry
Issue number5
StatePublished - 1 Sep 2015
Externally publishedYes


  • colorimetric probe
  • melamine sensor
  • nanoparticle aggregation
  • silver nanoparticles
  • zeta potential

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Molecular Medicine
  • Biomedical Engineering
  • Applied Microbiology and Biotechnology
  • Drug Discovery
  • Process Chemistry and Technology


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