RESUMEN
Feather meal protein was prepared in granular form and used as a support for lactase using glutaraldehyde as the crosslinking agent. The support gave a high retention of activity and in column operation it yielded apparent half-lives from 50 to 100 days. Because of its gel-like consistency (water content of about 90%), there is some diffusional restricting of activity as indicated by the kinetic data of soluble and immoblized enzymes.
Asunto(s)
Plumas , Galactosidasas , Animales , Queratinas , Oxidación-Reducción , ProteínasRESUMEN
Yeast spoilage was followed by measuring gas volume produced inside a sealed bag of inoculated fruit. Volume of gas produced correlates with plate counts.
Asunto(s)
Antifúngicos/farmacología , Microbiología de Alimentos , Conservación de Alimentos , Frutas , Caproatos/farmacología , Análisis de los Alimentos , Contaminación de Alimentos , Gases/análisis , Gases/biosíntesis , Métodos , Saccharomyces cerevisiae/crecimiento & desarrollo , Saccharomyces cerevisiae/metabolismo , Levaduras/metabolismoRESUMEN
The growth of Saccharomyces rouxii and Saccharomyces mellis, which are two of the main spoilage organisms of dates, can be inhibited by various treatments. The most effective treatment found in this study that did not affect flavor consisted of a predip of the dates in 2% potassium sorbate solution followed by injection of methyl bromide into the sealed package.
RESUMEN
Obtusastyrene (4-cinnamylphenol) displays effective antimicrobial activity in vitro against a variety of gram-positive bacteria, yeasts, and molds. The activity of obtusastyrene is not appreciably affected by pH, and its minimal inhibitory concentrations, 12 to 25 mug/ml for bacteria and 12 to 100 mug/ml for fungi, compare favorably with those of a number of synthetic, phenolic antimicrobial agents.