Photoacoustic Spectroscopy in the Optical Characterization of Foodstuff: A Review

Abstract

In this review, the application of the photoacustic spectroscopy (PAS) is presented as an option to evaluate the quality of food. This technique is a type of spectroscopy based on photothermal phenomena, which allow spectroscopic studies. According to the literature review, it was found that its application is increasing in several countries. Spectroscopic studies carried out by employing PAS in the food industry include, among others, fruit, vegetables, condiments, grains, legumes, flours, “tortillas,” milk, water, eggs, etc. Additionally, this technique has been used to evaluate adulterated, irradiated, and contaminated food and so on. The literature review has shown the applicability of PAS to one of the problems of the real world, i.e., food quality assessment. Therefore, PAS can contribute in the future with a wide potential for new applications in the food agroindustry.

Worthwhile Relevance of Infrared Spectroscopy in Characterization of Samples and Concept of Infrared Spectroscopy-Based Synchrotron Radiation

“…In this spectroscopy, the solid or liquid sample requires minimal sample treatment [44,50]. e sample is placed into the sample cup with an insertion of a sealed photoacoustic cell for the spectral measurement [44].…”

Optical absorption spectra of germinated seedlings from seeds exposed to vehicle polluting gases

“…PAS has been used to evaluate a wide variety of seeds, grains and seedlings providing valuable information on their physical properties [27][28][29][30]. Also PAS technique allows a nondestructive analysis from the optical absorption spectra of different samples, including optically opaque samples [31,32].…”

A Sensitive Carbon Dioxide Sensor Based on Photoacoustic Spectroscopy with a Fixed Wavelength Quantum Cascade Laser

“…In 1880, Bell reported the photoacoustic effect, when he discovered that when thin discs were irradiated with modulated light, an acoustic signal is produced [7]. Subsequently, many applications based on the photoacoustic effect were developed and photoacoustic spectroscopy (PAS) has become one of the most important examples [8,9,10]. PAS is widely used to detect trace gases because of its advantages, such as high detection sensitivity, fast response time, and a wide dynamic range [11,12,13,14,15].…”