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Paper swab based SERS detection of non-permitted colourants from dals and vegetables using a portable spectrometer
- Source :
- Analytica Chimica Acta. 1090:106-113
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- Rising concern about the use of non-permitted colourants, in common food items such as dals and green vegetables sold in Indian markets, have led to a demand for low-cost point-of-use chemical analysis tools. Conventional food-analysis techniques involving tedious sample preparation protocols are not suited for in-field applications. Surface Enhanced Raman Spectroscopy (SERS) is an analytical technique that is well-suited for point-of-use chemical analysis with molecular level detection capability, which can also serve as a quality assurance tool for businesses. Effective and rapid signal collection from a large-area sample within a field-setting using disposable, low-cost SERS substrates is a key challenge in implementing such a solution. Herein, we demonstrate the use of inkjet-printed thin films comprising of robust nanostructured-silver as flexible, paper-based SERS (P-SERS) swabs for the direct detection of Metanil Yellow (MY) from toor dal (yellow split pigeon peas) samples and Malachite Green (MG) from green peas and green chillies. The macroscopic uniformity of these thin-films in combination with a portable Raman spectrometer equipped with orbital raster scanning (ORS™) technology for signal collection results in an unprecedented precision (RSD ∼ 1.6%) upon characterizing samples saturated with Rhodamine-6G (R6G), a standard Raman probe. As several food-cleansing products have appeared in the marketplace, the adulterant removal efficacy of some commercially available ‘washes’ as well as products such as ‘ozoniser’, which was determined by SERS characterization of swabs before and after use, is also reported.
- Subjects :
- Paper
Silver
Sample (material)
Food Contamination
Nanotechnology
02 engineering and technology
Spectrum Analysis, Raman
01 natural sciences
Biochemistry
Analytical Chemistry
symbols.namesake
Molecular level
Vegetables
Rosaniline Dyes
Environmental Chemistry
Sample preparation
Coloring Agents
Spectroscopy
Adulterant
Spectrometer
Rhodamines
Chemistry
010401 analytical chemistry
Analytical technique
Peas
Chemical Engineering
Surface-enhanced Raman spectroscopy
021001 nanoscience & nanotechnology
Nanostructures
0104 chemical sciences
symbols
Capsicum
0210 nano-technology
Raman spectroscopy
Azo Compounds
Subjects
Details
- ISSN :
- 00032670
- Volume :
- 1090
- Database :
- OpenAIRE
- Journal :
- Analytica Chimica Acta
- Accession number :
- edsair.doi.dedup.....0aa3a148cbde7a0693e13e3aede6b341