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dc.creatorSilva, Sergio Henrique-
dc.creatorLago, Amanda Maria Teixeira-
dc.creatorRivera, Fernando Pujaico-
dc.creatorPrado, Mônica Elisabeth Torres-
dc.creatorBraga, Roberto Alves-
dc.creatorResende, Jaime Vilela de-
dc.identifier.citationSILVA, S. H. et al. Measurement of water activities of foods at different temperatures using biospeckle laser. Journal of Food Measurement and Characterization, [S. l.], v. 12, n. 3, p. 2230-2239, Sept. 2018.pt_BR
dc.description.abstractWater is one of the main components of food and its presence is related to the rate of deterioration of foods. Thus, control of the water activity (aw) is a fundamental feature of food technology. The methods currently used for determining aw of foods mostly use the relative vapor pressure of the product to quantify the aw at constant temperature. This last factor limits evaluation of the aw because the instrument used is not capable of determining the aw at temperatures lower than 25 °C and/or at negative temperatures. In this study, the potential of the biospeckle laser for aw measurement was evaluated. Contrast analysis using the biospeckle laser technique provided statistically significant differences in the concentrations and aw for lithium chloride solutions and model solutions of pectin and sucrose at temperatures of 0, 5, 10, 15, 20, and 25 °C, as well as at freezing temperatures. After calibration of the biospeckle laser with the lithium chloride solutions, aw of corn starch, oatmeal, and wheat flour was determined at different temperatures, with errors lower than 20%. This achievement provides a platform for developing protocols to measure the aw of foods at different temperatures using the biospeckle laser.pt_BR
dc.sourceJournal of Food Measurement and Characterizationpt_BR
dc.subjectOptical methodspt_BR
dc.subjectSaline solutionpt_BR
dc.subjectTemporal contrastpt_BR
dc.subjectWater activitypt_BR
dc.subjectBiospeckle laserpt_BR
dc.subjectMétodos ópticospt_BR
dc.subjectSolução salinapt_BR
dc.subjectContraste temporalpt_BR
dc.subjectAtividade aquáticapt_BR
dc.subjectLaser de biospecklept_BR
dc.titleMeasurement of water activities of foods at different temperatures using biospeckle laserpt_BR
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