Optimization of ohmic heating applications for pectin methylesterase inactivation in orange juice
نویسندگان
چکیده
منابع مشابه
Thermal inactivation of pectin methylesterase, polygalacturonase, and peroxidase in tomato juice.
Thermal inactivation kinetics have been determined for pectin methylesterase (PME), polygalacturonase (PG), and peroxidase (POD) in tomato juice. Two parameters, the inactivation rate constant (k) at a reference temperature and the activation energy for inactivation (E(a)), were determined for each enzyme. For PME and PG, the k and E(a) values reported here do not agree with those in several pr...
متن کاملStability and sensory shelf life of orange juice pasteurized by continuous ohmic heating.
Electrical heating of food products provides rapid and uniform heating, resulting in less thermal damage to the product. The objective of this research was to examine the effects of ohmic heating on the stability of orange juice with comparison to conventional pasteurization. During storage at 4 degrees C, degradation curves of ascorbic acid followed a linear decrease pattern in both ohmic-heat...
متن کاملInactivation kinetics of food enzymes during ohmic heating
0308-8146/$ see front matter 2010 Elsevier Ltd. A doi:10.1016/j.foodchem.2010.04.047 * Corresponding author. Tel.: +421 2 59325254; fax E-mail address: [email protected] (M. Pola Ohmic heating of milk and fruit and vegetable juices was carried out at several incubation temperatures to investigate inactivation of alkaline phosphatase, pectin methylesterase and peroxidase. Mechanisms of in...
متن کاملPectin methylesterase, metal ions and plant cell-wall extension. Hydrolysis of pectin by plant cell-wall pectin methylesterase.
The hydrolysis of p-nitrophenyl acetate catalysed by pectin methylesterase is competitively inhibited by pectin and does not require metal ions to occur. The results suggest that the activastion by metal ions may be explained by assuming that they interact with the substrate rather than with the enzyme. With pectin used as substrate, metal ions are required in order to allow the hydrolysis to o...
متن کاملEffect of pectin methylesterase on carrot (Daucus carota) juice cloud stability.
To determine the effect of residual enzyme activity on carrot juice cloud, 0 to 1 U/g pectin methylesterase (PME) was added to pasteurized carrot juice. Cloud stability and particle diameters were measured to quantify juice cloud stability and clarification for 56 days of storage. All levels of PME addition resulted in clarification; higher amounts had a modest effect in causing more rapid clar...
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ژورنال
عنوان ژورنال: Journal of Food Science and Technology
سال: 2012
ISSN: 0022-1155,0975-8402
DOI: 10.1007/s13197-012-0700-5