Melamine detection in liquid milk based on selective porous polymer monolith mediated with gold nanospheres by using surface enhanced Raman scattering.

A rapid and fast detection of trace amounts of melamine in milk is reported by using Gold Nano Spheres embedded monolith conjugates. Monolith was synthesized by the polymerization of Glycidyl Methacrylate (GMA) and Ethylene Dimethacrylate(EDMA) (cross linker and functional monomer), Cyclohexanol (Porogen formation) and 2, 2-Dimethoxy-2-phenyl-acetophenone (photo-initiator) on gold coated silicon wafer. In order to gauge the influence of monolith on SERS signal activity, three shapes of gold nanoparticles namely Gold Nano Spheres (GNSs), Gold Nanorods (GNRs) and Triangular Gold Nanoprisms (GNPrs) were immobilized on monolithic surface and analyzed by the signal molecule Rhodamine (R6G). The Raman Enhancement efficiency of the above three shapes incorporated with monolith was monitored by calculating their maximum enhancement factors. Among three morphologies, Gold Nano Spheres integrated in GMA-EDMA Monolith Sensor (GNS@GEMS) was found more effective for detection of R6G than two others and was therefore projected in analysis of melamine sensing in commercial milk. A linear relationship of regression model (R2 = 0.99) was observed between melamine SERS intensity (at 710 cm-1) and varied concentrations (6.5 < mg/L < 0.125). The lower limit of detection (LOD) and limit of quantification (LOQ) for melamine was determined 0.11 mg/L and 0.38 mg/L respectively. The time window for detection of melamine was 10 min and hence our method is compatible with the FDA's tolerance limit in USA and China (1 mg/L).

• Publication year

  2019

• Venue

  Food Chemistry

• Publication date

  2019-03-30

• Fields of study

  Medicine, Materials Science, Chemistry

• Identifiers
  DOI 10.1016/j.foodchem.2018.11.027PMID 30502195
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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