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INACTIVATION KINETICS OF LIPOXYGENASE IN PRESSURIZED RAW SOYMILK AND SOYMILK FROM HIGH-PRESSURE TREATED SOYBEANS
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INACTIVATION KINETICS OF LIPOXYGENASE IN PRESSURIZED RAW SOYMILK AND SOYMILK FROM HIGH-PRESSURE TREATED SOYBEANS

Author: JOSÉ A GUERRERO-BELTRÁN; YOKIUSHIRDHILGILMARA ESTRADA-GIRÓN; BARRY G SWANSON; GUSTAVO V BARBOSA-CÁNOVAS
Publisher: Blackwell Publishing
Edition/Format: Article Article : English
Publication:Journal of Food Processing and Preservation, 33, no. 2 (2009): 143-158
Database:ArticleFirst
Other Databases: ElsevierBritish Library Serials
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Document Type: Article
All Authors / Contributors: JOSÉ A GUERRERO-BELTRÁN; YOKIUSHIRDHILGILMARA ESTRADA-GIRÓN; BARRY G SWANSON; GUSTAVO V BARBOSA-CÁNOVAS
ISSN:0145-8892
Language Note: English
Unique Identifier: 439405103
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schema:description"High hydrostatic pressure (HHP) treatment (275, 345, 483, 550 and 620 MPa), combined with thermal treatment (19, 50, 65, 70 and 80C), was applied for selected times to raw soymilk and to previously soaked soybeans before preparation of soymilk. Lipoxygenase (LOX) activity in HHP-treated raw soymilk was described using a first-order kinetics model. At low or moderate pressures, alone or in combination with thermal treatment, LOX activity exhibited high stability. Soymilks treated at 550 MPa exhibited high LOX inactivation rate constant values. Temperature dependence on the inactivation rate constants of soymilk treated at 550 MPa indicated that high activation energy was required to inactivate the enzyme in soymilk from HHP-treated soybeans compared with that for HHP-treated raw soymilk. Lipoxygenase activity was not detected in soymilk from HHP (620 MPa and 80C) treated soybeans. Soybean processed products have to have the minimum amount of antinutritional factors. Soymilk has to be pasteurized to deliver a soy product with low microbial load and enzymes to avoid deterioration during storage. The traditional process to obtain this type of soy product is using thermal treatment; however, this treatment can change nutritional and sensory characteristics. An alternative approach to process soymilk is using high hydrostatic pressure treatments, alone or in combination with thermal processing, to deliver milk with fresh like sensory characteristics free from pathogens and deteriorative enzymes. Lipoxygenase could deteriorate soymilk fat to produce chemicals and off-flavor."
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