دورية أكاديمية

Composition, somatic cell count and casein fractions of ethanol unstable milks.

التفاصيل البيبلوغرافية
العنوان: Composition, somatic cell count and casein fractions of ethanol unstable milks.
Alternate Title: Composição, contagem de células somáticas e frações de caseína em leites instáveis ao etanol. (Portuguese)
المؤلفون: de Oliveira, Carlos Augusto Fernandes, Lopes, Ludmila Camargo, Rosim, Roice Eliana, Fernandes, Andrezza Maria, Corassin, Carlos Humberto
المصدر: Acta Scientiarum: Technology; Jan-Mar2013, Vol. 35 Issue 1, p153-156, 4p, 2 Charts
Abstract (English): This study determined the composition, somatic cell count (SCC) and relative percentage of α-S1, α-S2, β and κ caseins in ethanol-unstable (UNA) and stable bulk milk samples. The sampling plan involved farms that supplied milk to one dairy plant located in the northeast region of São Paulo, Brazil, in May (fall), July (winter), and September (spring) 2007. Three hundred thirty-four bulk milk samples within an acceptable range of pH and acidity were included in the study and divided into two groups: a) stable milk, when protein precipitation only occurred with 78% ethanol (v/v); and b) unstable (UNA) milk, when the precipitation occurred with 72% ethanol (v/v). From the total samples analyzed, 77 (23%) were unstable in the 72% ethanol (v/v), although they have shown normal pH and acidity, and 41 (12.3%) were stable in 78% ethanol (v/v). No differences were found between relative percentages of α and β- casein in UNA or stable milks. However, UNA samples showed higher SCC, as well as lower casein and lactose contents. Results indicated that the high SCC may be involved as a causal factor for the high incidence of UNA milks in the herds studied. [ABSTRACT FROM AUTHOR]
Abstract (Portuguese): O objetivo deste estudo foi determinar a composição, contagem de células somáticas (CCS) e percentual de α-S1, α-S2, β e κ caseínas em amostras de leite estável e de leite instável ao etanol (LINA). A amostragem envolveu fazendas fornecedoras de um laticínio localizado em São Paulo, Brasil, nos meses de maio (outono), julho (inverno) e setembro (primavera) de 2007. Trezentas e trinta e quatro amostras de leite de conjunto encontradas dentro da faixa aceitável de pH e acidez foram incluídas e divididas em dois grupos: a) leite estável, quando a precipitação de proteínas ocorreu apenas com 78% de etanol (v/v) e b) LINA, quando ocorreu com 72% de etanol (v/v). Do total de amostras analisadas, 77 (23%) eram instáveis ao etanol 72% (v/v), embora apresentassem pH e acidez normais, e 41 (12,3%) mantiveram-se estáveis ao etanol a 78% (v/v). Não foram encontradas diferenças nos percentuais de α e β caseínas dos leites estáveis e identificados como LINA. Entretanto, as amostras de LINA apresentaram CCS maior que as de leite estável, e menores teores de caseína e lactose. Os resultados indicam que alta CCS nas amostras de leite pode estar envolvida como fator causal da elevada incidência de LINA no estudo. [ABSTRACT FROM AUTHOR]
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قاعدة البيانات: Complementary Index