Food analysis employing high energy nanosecond laser and low pressure He ambient gas

We report the results of an experimental study of food analysis using Nd:YAG nanosecond (ns) laser at various pulse energies in atmospheric ambient air and He ambient gas at different pressures. In contrary to previous results indicating the unfavorable applications of LIBS to food analysis using lo...

Full description

Saved in:
Bibliographic Details
Published in:Microchemical journal 2019-06, Vol.147, p.356-364
Main Authors: Hedwig, Rinda, Lahna, Kurnia, Idroes, Rinaldi, Karnadi, Indra, Tanra, Ivan, Iqbal, Javed, Kwaria, Dennis, Kurniawan, Davy Putra, Kurniawan, Koo Hendrik, Tjia, May On, Kagawa, Kiichiro
Format: Article
Language:English
Subjects:
Food analysis
He ambient gas
High energy ns Nd:YAG laser
Low pressure LIBS
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We report the results of an experimental study of food analysis using Nd:YAG nanosecond (ns) laser at various pulse energies in atmospheric ambient air and He ambient gas at different pressures. In contrary to previous results indicating the unfavorable applications of LIBS to food analysis using lower pulse energies and atmospheric ambient air, this study demonstrates clearly the excellent spectral quality obtained from a number of food samples of different hardnesses with high energy (132 mJ) ns laser pulses and 20 Torr He ambient gas. A series of energy dependent intensity measurements show that the intensities generally increase with higher laser energies and harder samples which can be attributed to the generation of stronger shock wave plasma and the subsequently induced He assisted excitation (HAE) mechanism which is responsible for the sharp emission lines and the very low spectral background. Using mochi samples with different Cu impurity contents, this experiment further reveals the existence of a linear calibration line and a detection limit of sub ppm level. The results of this study have thus suggested the promising development of low cost and practical technique for quantitative food analysis in place of more expensive and bulkies picosecond laser used before. •Nanosecond YAG laser has been successfully used for soft biological samples.•Sharp emission lines and low background spectra are obtained.•No sample pretreatment for food samples such as egg, sausage•Linear calibration curve, LOD for Cu 100 ppb
ISSN:0026-265X
1095-9149
DOI:10.1016/j.microc.2019.03.055