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Controlling spoilage yeasts


Controlling spoilage spoilage

decomposition; said of meat, milk, animal feeds especially ensilage.
 yeasts in foods and beverages is the subject of ongoing research in the European Union. A collection of spoilage yeasts, isolated mostly from wines, olives, sugar syrups and yellow sauces, is being put together to obtain reference strains so that scientists can develop and apply rapid techniques for typing, identifying and testing the growth of these yeasts under a range of conditions.

Researchers found a specific strain of Z. bailli (ISA (1) (Instruction Set Architecture) See instruction set.

(2) (Interactive Services Association) See Internet Alliance.

(3) (Internet Security and Acceleration) See .NET.
 1307) to be very resistant to sorbic acid. It was used for a number of studies together with S. cerevisiae. For example, the former grew at acetic acid levels of up to 3.5% and the latter at levels of up to 1% at pH 4. The presence of acetic or benzoic acids decreased the temperature range at which these microorganisms grow, indicating that their viability at high or low temperatures is strongly influenced by the presence of preservatives.

Z. bailli has an optimum temperature for growth at 32 C and has an associative temperature profile. In other words Adv. 1. in other words - otherwise stated; "in other words, we are broke"
put differently
, death and growth coexist from 33 C to 39 C. The presence of ethanol, acetic acid or sorbic acid causes a shift of the lethal temperature to lower values.

However, this effect was less pronounced in Z. bailli than in S. cerevisiae. Both strains also can extrude extrude /ex·trude/ (ek-strldbomacd´)
1. to force out, or to occupy a position distal to that normally occupied.

2. in dentistry, to occupy a position occlusal to that normally occupied.
 benzoic acid during growth in the presence of almost any weak acid. The physiological relevance of this activity is being investigated. Resistant strains of Z. bailli and P. membranaefaciens can grow in sorbic acid concentrations of 650 ppm. The former can also grow on 70% glucose.

Further information. V. Loureiro, Instituto Superior de Agronomia Instituto Superior de Agronomia (ISA), School of Agronomy - Technical University of Lisbon, is a national and international renowned faculty of excellence for graduation and post-graduation studies in Agronomy, Forestry, Food Science, Landscape Architecture, Environment, Animal , Department of Botony and Biology, P-1399 Lisbon Codex codex

Manuscript book, especially of Scripture, early literature, or ancient mythological or historical annals. The earliest type of manuscript in the form of a modern book (i.e.
, Portugal; phone: +351-1-3638161; fax: +351-1-3635031.
COPYRIGHT 1998 Food Technology Intelligence, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 1998, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

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Publication:Microbial Update International
Date:Jun 1, 1998
Words:286
Previous Article:Safety criteria for minimally-processed foods
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