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Analysis of temperature distribution in potato tissue during blanching and its effect on the absolute residual pectin methylesterase activity

Gonzalez-M, Gerardo LU ; Ahrne, L; Gekas, Vassilis LU and Sjöholm, Ingegerd LU (2004) In Journal of Food Engineering 65(3). p.433-441
Abstract
Dynamic changes in absolute residual PME activity in potato tubers undergoing blanching were analysed with regard to the temperature distribution in the tissue after the treatment. The finite-element technique was used to predict the temperature distribution within the tissue during blanching. The temperature-related behaviour of the enzyme indicated that blanching between 60 and 70 degreesC induced thermal activation of PME in blanched potatoes. The temperature distribution in the tissue during blanching showed that activation takes place as soon as the tissue reaches an average temperature above 50 degreesC. However, the temperature dependence of the absolute residual PME activity in the tissue, when blanching at temperatures between 50... (More)
Dynamic changes in absolute residual PME activity in potato tubers undergoing blanching were analysed with regard to the temperature distribution in the tissue after the treatment. The finite-element technique was used to predict the temperature distribution within the tissue during blanching. The temperature-related behaviour of the enzyme indicated that blanching between 60 and 70 degreesC induced thermal activation of PME in blanched potatoes. The temperature distribution in the tissue during blanching showed that activation takes place as soon as the tissue reaches an average temperature above 50 degreesC. However, the temperature dependence of the absolute residual PME activity in the tissue, when blanching at temperatures between 50 and 70 degreesC, did not follow Arrehenius' law. The degree of PME activity in the blanched tissue was found to depend on the "effective exposure time" to the temperature at which the activation/deactivation of the enzyme takes places. Thermal activation of PME in potato tissue occurred during the first two minutes of blanching. Longer heating times induced rapid deactivation of the enzyme in the tissue. (C) 2004 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Finite-element analysis, Thermal deactivation rate, Absolute PME activity, Thermal activation, Temperature distribution, Potato, Blanching, Thermal activity coefficient
in
Journal of Food Engineering
volume
65
issue
3
pages
433 - 441
publisher
Elsevier
external identifiers
  • wos:000222807700015
  • scopus:2942598144
ISSN
0260-8774
DOI
10.1016/j.jfoodeng.2004.02.003
language
English
LU publication?
yes
id
5729540f-6666-4539-a282-25f3fb5229bc (old id 139180)
date added to LUP
2007-07-18 14:07:17
date last changed
2017-09-24 04:21:33
@article{5729540f-6666-4539-a282-25f3fb5229bc,
  abstract     = {Dynamic changes in absolute residual PME activity in potato tubers undergoing blanching were analysed with regard to the temperature distribution in the tissue after the treatment. The finite-element technique was used to predict the temperature distribution within the tissue during blanching. The temperature-related behaviour of the enzyme indicated that blanching between 60 and 70 degreesC induced thermal activation of PME in blanched potatoes. The temperature distribution in the tissue during blanching showed that activation takes place as soon as the tissue reaches an average temperature above 50 degreesC. However, the temperature dependence of the absolute residual PME activity in the tissue, when blanching at temperatures between 50 and 70 degreesC, did not follow Arrehenius' law. The degree of PME activity in the blanched tissue was found to depend on the "effective exposure time" to the temperature at which the activation/deactivation of the enzyme takes places. Thermal activation of PME in potato tissue occurred during the first two minutes of blanching. Longer heating times induced rapid deactivation of the enzyme in the tissue. (C) 2004 Elsevier Ltd. All rights reserved.},
  author       = {Gonzalez-M, Gerardo and Ahrne, L and Gekas, Vassilis and Sjöholm, Ingegerd},
  issn         = {0260-8774},
  keyword      = {Finite-element analysis,Thermal deactivation rate,Absolute PME activity,Thermal activation,Temperature distribution,Potato,Blanching,Thermal activity coefficient},
  language     = {eng},
  number       = {3},
  pages        = {433--441},
  publisher    = {Elsevier},
  series       = {Journal of Food Engineering},
  title        = {Analysis of temperature distribution in potato tissue during blanching and its effect on the absolute residual pectin methylesterase activity},
  url          = {http://dx.doi.org/10.1016/j.jfoodeng.2004.02.003},
  volume       = {65},
  year         = {2004},
}