Publications by authors named "Maria Ines Valdez-Narvaez"
Article Synopsis
- - An exposure assessment model has been developed to estimate microbial concentrations in rice-derived products after 24 hours of storage at 20°C, considering both growth and inactivation of spores.
- - The model shows that chitosan can significantly reduce microbial load during storage, serving as an added control measure to enhance food safety when there are cold chain interruptions.
- - Under two contamination scenarios, the model predicts that 55% to 100% of portions could be contaminated, highlighting the importance of using chitosan to maintain product quality and safety throughout the supply chain.
Article Synopsis
- * The study tested low-pressure CP with oxygen and synthetic air at various power levels (100-300 W) and exposure times (10-30 min), effectively killing the bacteria with notable differences in performance between the gases.
- * Results showed that air plasma achieved a 3.71-log reduction, while oxygen plasma exceeded 5 log cycles, attributed to the strong antimicrobial properties of oxygen-containing radicals; the Weibull model successfully represented bacterial inactivation.
This study investigated the effects of low-pressure cold plasma on the inactivation of vegetative cells and spores in an inert matrix (borosilicate glass slide) and in rice grains, using oxygen as ionization gas. Greater reductions in counts were observed in vegetative cells rather than spores. The experimental data obtained show that both the power of the plasma treatment and the matrix proved to be determining factors in the inactivation of both the spores and vegetative cells of .
View Article and Find Full Text PDFRice due to its high carbohydrate content, is an ideal medium for growth, a spore-producing microorganism. The objective of this study was to determine the antimicrobial activity of a grape extract in combination with heat treatments and different pH against spores in a rice solution. The survivor data obtained were fitted to the Weibull survival function, and the values of parameters and (scale and shape indexes, respectively) were determined.
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