Sorbate
Mostrando 25-36 de 57 artigos, teses e dissertações.
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25. Estimativa da ingestão diaria dos conservadores acido benzoico e acido sorbico no Brasil
The daily intake of benzoic and sorbic acids and their respective sodium, potassium and calcium salts from selected food categories was estimated in Brazil in the year 1999. The Budget method was used as a tirst screening procedure for the estimation of the safety aspects of the maximum permitted levels of benzoates and sorbates established by the Brazilian
Publicado em: 2000
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26. Estudo da adsorção de inulinases em colunas com resinas de troca ionica : paramentros experimentais e modelagem
The inulinases are enzymes with great commercial potencial, as they hydrolise inulin producing important products for the food industry such as fructose and fructose oligomeres. The separation and purification of these enzymes, with efficiency and compatible costs, is of great importance to the development of adsorption techniques and protocols which may opt
Publicado em: 2000
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27. Crisotila como suporte para acidos de Lewis na catalise de reações de Friedel-Crafts
The catalytic alkylation of benzene with benzyl chrolide was studied using chrysotile as a support for Lewis acid. Two methods of immobilization were used: grinding the acid and the support together, and adsorption from an organic solution. Within the acids supported on chrysotile studied, FeCI3, CoCI2 and ZnCl2 have shown good catalytic activity, giving yel
Publicado em: 1994
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28. Cicloprogramação de 1,3-dienos substituidos pela reação de Simmons-Smith
The cyclopropanation of 1,3-diene by the Simmons-Smith reaction is normally inefficient and generates very low yields in products. The objective of this work was to verify the reactivity, site-selectivity, and stereospecificity of cyclopropanation of substituted 1,3-dienes, under drastic conditions of pressure (up to 4 kbar) and temperature (from 80 to 120°
Publicado em: 1993
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29. Estudo da reação de Simmons-Smith : obtenção vinilciclopropanos substituidos de interesse industrial
Of the procedures described in the literature, that of Rawson e Harrison gives under standard conditions the best results for the cyclopropanation of cyclohexene. We found that the noble metal salt used to activate the metallic zinc has a more important role than to clean its surface, as the yield of the reaction is strongly influenced by the anion. In the p
Publicado em: 1990
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30. Cálculo de espectros de fotoemissão eletrônica de um dímero adsorvido em metal / Electronic photoemission spectra of a dimmer embedded in a metal
The Renormalization Group technique developed by Wilson in 1975 is used to calculate photoemission spectra (XPS) for a dimer adsorbed on a metal; our model for this system comprises two deep levels, separated by a distance R, coupled to each other, and interacting electrostatically with the sorbate. The inversion symmetry is used to define two electronics cu
Publicado em: 1989
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31. Effect of Potassium Sorbate on Salmonellae, Staphylococcus aureus, Clostridium perfringens, and Clostridium botulinum in Cooked, Uncured Sausage
Skinless precooked, uncured sausage links with and without potassium sorbate (0.1% wt/wt) were inoculated with salmonellae, Staphylococcus aureus, Clostridium perfringens, and Clostridium botulinum and held at 27 C to represent temperature abuse of the product. Total counts of uninoculated product showed that the normal spoilage flora was delayed 1 day when
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32. Effect of pH, temperature, and potassium sorbate on amino acid uptake in Salmonella typhimurium 7136.
The effect of sorbate on L-serine and L-histidine uptake in Salmonella typhimurium was studied at various pH levels, temperatures, and amino acid and sorbate concentrations. Low pH had an apparent synergistic effect on amino acid uptake inhibition caused by sorbate. The relationship between sorbate concentration and the amount of amino acid uptake inhibition
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33. Effects of potassium sorbate and other antibotulinal agents on germination and outgrowth of Clostridium botulinum type E spores in microcultures.
The effects of potassium sorbate, sodium hypophosphite, sodium tripolyphosphate, sodium nitrite, and linoleic acid on the germination and outgrowth of Clostridium botulinum type E spores were studied in microcultures. At pH 5.8 to 6.0 in liver veal agar, the germination rate was decreased to nearly zero with 1.0, 1.5, or 2.0% sorbate. At pH 7.0 t 7.2, these
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34. Prevention of surface mold growth on Italian dry sausage by natamycin and potassium sorbate.
Inhibition of uncontrolled mold growth on three types of raw cured Italian dry salami was studied under commercial production conditions. Salami were dipped or sprayed with natamycin (pimaricin) or were given a combined organic acid-plus-potassium sorbate treatment. Acetic and citric acids potentiated the inhibitory effects of potassium sorbate significantly
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35. Potential for Development of Tolerance by Penicillium digitatum and Penicillium italicum after Repeated Exposure to Potassium Sorbate †
Two strains of Penicillium digitatum and one strain of Penicillium italicum were exposed to various levels of sorbic acid and potassium sorbate, and the MICs were determined. Selected strains of the molds were then repeatedly exposed to subinhibitory levels of the compounds to determine whether increased tolerance might develop. The MIC of sorbic acid (pH 4.
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36. Mechanisms of sorbate inhibition of Bacillus cereus T and Clostridium botulinum 62A spore germination.
The mechanism by which potassium sorbate inhibits Bacillus cereus T and Clostridium botulinum 62A spore germination was investigated. Spores of B. cereus T were germinated at 35 degrees C in 0.08 M sodium-potassium phosphate buffers (pH 5.7 and 6.7) containing various germinants (L-alanine, L-alpha-NH2-n-butyric acid, and inosine) and potassium sorbate. Spor