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Rapid Food Authentication Using a Portable Laser-Induced Breakdown Spectroscopy System.

Xi Wu¹, Sungho Shin¹, Carmen Gondhalekar^1,2

¹Department of Basic Medical Sciences, Purdue University, West Lafayette, IN 47907, USA.

Foods (Basel, Switzerland)

|January 21, 2023

Summary

Portable Laser-Induced Breakdown Spectroscopy (LIBS) offers a fast and accurate method for authenticating agricultural products like cheese and coffee. This technology requires minimal sample preparation, making it ideal for detecting food fraud in the field.

Keywords:

LIBS authentication food fraud spectroscopy

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Area of Science:

Analytical Chemistry
Spectroscopy
Food Science

Background:

Food fraud is a growing concern, necessitating rapid and portable detection methods.
Laser-Induced Breakdown Spectroscopy (LIBS) is an atomic emission spectroscopy technique for material analysis.
LIBS is being explored for compositional analysis of agricultural goods.

Purpose of the Study:

To evaluate the performance of portable LIBS for food authentication.
To demonstrate the utility of LIBS for verifying regional agricultural commodities.
To compare portable and benchtop LIBS systems.

Main Methods:

Commercial handheld LIBS equipment was used.
Analyzed European Alpine-style cheeses, coffee, spices, balsamic vinegar, and vanilla extracts.
Spectra were processed and used to train an elastic net-regularized multinomial classifier.

Main Results:

LIBS successfully authenticated various agricultural products with minimal sample preparation.
Portable LIBS systems showed robust and accurate performance.
Comparison with benchtop systems validated the field-deployable approach.

Conclusions:

Field-deployable LIBS is a robust, accurate, and user-friendly platform for agricultural product verification.
The technique requires minimal to no sample preparation.
LIBS is a promising optical technology for combating food fraud.