atividade de plasmina e plasminogênio no leite longa vida com alta e baixa contagem de células somáticas durante o armazenamento activity of plasmin and plasminogen in ultra high temperature milk with high and low somatic cell counts during storage
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2010
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Abstract
O objetivo deste estudo foi avaliar o efeito da contagem de células somáticas (CCS) do leite na atividade de plasmina e plasminogênio durante o período de armazenamento do leite longa vida integral. Os leites crus foram categorizados em grupos de CCS de baixa (342.000-487.000 células mL-1) e alta contagem (603.000-808.000 células mL-1). Dois lotes de leite longa vida em cada categoria de CCS foram analisados para determinação de plasmina e plasminogênio após 10, 30, 60, 90 e 120 dias de armazenamento em temperatura ambiente. Para a fabricação do leite longa vida, o leite cru foi submetido à pasteurização rápida seguida da esterilização industrial do leite por injeção de vapor pelo método direto e embalagem asséptica do produto. A CCS não apresentou efeitos sobre as características físico-químicas do leite cru, e nem sobre a atividade de plasmina e plasminogênio nos leites cru e longa vida, armazenados por 120 dias. Entretanto, independentemente da CCS, a atividade de plasmina e plasminogênio aumentou no leite longa vida ao longo do armazenamento, indicando a possibilidade de aumento da proteólise no produto durante sua vida de prateleira.
This study aimed to evaluate the effect of somatic cell counts (SCC) in milk on plasmin and plasminogen activities of ultra high temperature (UHT) milk during storage. Raw milks were categorized in SCC groups of low (342,000-487,000 cells mL-1) and high cells (603,000-808,000 cells mL-1). Two replicates of UHT milks within each SCC category were analyzed for plasmin and plasminogen activities after 10, 30, 60, 90 and 120 days of storage at room temperature. For manufacture of UHT milk, raw milk was pasteurized and sterilized by direct vapor injection process, followed by aseptic packaging. SCC had no effect on physical-chemical characteristics of raw milk, and on plasmin or plasminogen activities in raw and UHT milks during 120 days of storage. However, independently of the SCC in raw milk, the activity of plasmin and plasminogen increased in UHT milk during storage, hence indicating a possible increase in proteolysis in the product during its shelf-life.
This study aimed to evaluate the effect of somatic cell counts (SCC) in milk on plasmin and plasminogen activities of ultra high temperature (UHT) milk during storage. Raw milks were categorized in SCC groups of low (342,000-487,000 cells mL-1) and high cells (603,000-808,000 cells mL-1). Two replicates of UHT milks within each SCC category were analyzed for plasmin and plasminogen activities after 10, 30, 60, 90 and 120 days of storage at room temperature. For manufacture of UHT milk, raw milk was pasteurized and sterilized by direct vapor injection process, followed by aseptic packaging. SCC had no effect on physical-chemical characteristics of raw milk, and on plasmin or plasminogen activities in raw and UHT milks during 120 days of storage. However, independently of the SCC in raw milk, the activity of plasmin and plasminogen increased in UHT milk during storage, hence indicating a possible increase in proteolysis in the product during its shelf-life.
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| Authors | ;Carlos Humberto Corassin;Roice Eliana Rosim;Carlos Augusto Fernandes de Oliveira |
| Journal | Trials |
| Year | 2010 |
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