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Proceedings Paper

Laser metrology in food-related systems
Author(s): Patricia Mendoza-Sanchez; Daniel Lopez; Teepakorn Kongraksawech; Pedro Vazquez; J. Antonio Torres; Jose Alberto Ramirez; Jorge Huerta-Ruelas
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Paper Abstract

An optical system was developed using a low-cost semiconductor laser and commercial optical and electronic components, to monitor food processes by measuring changes in optical rotation (OR) of chiral compounds. The OR signal as a function of processing time and sample temperature were collected and recorded using a computer data acquisition system. System has been tested during two different processes: sugar-protein interaction and, beer fermentation process. To study sugar-protein interaction, the following sugars were used: sorbitol, trehalose and sucrose, and in the place of Protein, Serum Albumin Bovine (BSA, A-7906 Sigma-Aldrich). In some food processes, different sugars are added to protect damage of proteins during their processing, storage and/or distribution. Different sugar/protein solutions were prepared and heated above critical temperature of protein denaturation. OR measurements were performed during heating process and effect of different sugars in protein denaturation was measured. Higher sensitivity of these measurements was found compared with Differential Scanning Calorimetry, which needs higher protein concentration to study these interactions. The brewing fermentation process was monitored in-situ using this OR system and validated by correlation with specific density measurements and gas chromatography. This instrument can be implemented to monitor fermentation on-line, thereby determining end of process and optimizing process conditions in an industrial setting. The high sensitivity of developed OR system has no mobile parts and is more flexible than commercial polarimeters providing the capability of implementation in harsh environments, signifying the potential of this method as an in-line technique for quality control in food processing and for experimentation with optically active solutions.

Paper Details

Date Published: 14 February 2005
PDF: 8 pages
Proc. SPIE 5776, Eighth International Symposium on Laser Metrology, (14 February 2005); doi: 10.1117/12.611643
Show Author Affiliations
Patricia Mendoza-Sanchez, Ctr. de Investigacion en Ciencia Aplicada y Tecnologia Avanzada del IPN (Mexico)
Oregon State Univ. (United States)
Daniel Lopez, Ctr. de Investigación en Ciencia Aplicada y Tecnologia Avanzada del IPN (Mexico)
Oregon State Univ. (United States)
Teepakorn Kongraksawech, Oregon State Univ. (United States)
Pedro Vazquez, Oregon State Univ. (United States)
J. Antonio Torres, Oregon State Univ. (United States)
Jose Alberto Ramirez, Univ. Autonoma de Tamaulipas (Mexico)
Jorge Huerta-Ruelas, Ctr. de Investigacion en Ciencia Aplicada y Tecnologia Avanzada del IPN (Mexico)
Oregon State Univ. (United States)

Published in SPIE Proceedings Vol. 5776:
Eighth International Symposium on Laser Metrology
R. Rodriguez-Vera; F. Mendoza-Santoyo, Editor(s)

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