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Osmotic processing: Effects of osmotic medium composition on the kinetics and texture of apple tissue

Mavroudis, Nikolaos E.; Gidley, Michael J. and Sjöholm, Ingegerd LU (2012) In Food Research International 48(2). p.839-847
Abstract
The effect of modification of osmotic medium composition with salts on the texture changes and process kinetics was evaluated in the present study. Inner and outer apple cortex parenchyma (Kim var.) was subjected to osmotic processing at 20.40 and 60 degrees C. The four osmotic media used were of identical osmotic pressure but slightly different compositions. The solution 1, Si, was a 50% w/w sucrose solution. The solution 2, S2, was 49.47% sucrose + 0.25% CaCl2. The solution 3, 53, was 48.27% sucrose + 0.5% CaCl2. The solution 4, 54, was 40.52% w/w sucrose + 0.50% w/w CaCl2 + 2% w/w NaCl. The solid gain and water loss were influenced by the initial structure (inner-outer cortex). The osmotic processing kinetics of the apple tissue... (More)
The effect of modification of osmotic medium composition with salts on the texture changes and process kinetics was evaluated in the present study. Inner and outer apple cortex parenchyma (Kim var.) was subjected to osmotic processing at 20.40 and 60 degrees C. The four osmotic media used were of identical osmotic pressure but slightly different compositions. The solution 1, Si, was a 50% w/w sucrose solution. The solution 2, S2, was 49.47% sucrose + 0.25% CaCl2. The solution 3, 53, was 48.27% sucrose + 0.5% CaCl2. The solution 4, 54, was 40.52% w/w sucrose + 0.50% w/w CaCl2 + 2% w/w NaCl. The solid gain and water loss were influenced by the initial structure (inner-outer cortex). The osmotic processing kinetics of the apple tissue revealed that both the water loss and the solid gain were influenced by the osmotic medium used. At each temperature when the Si medium is used the uptake of the solids is the highest, and when one of the S2 and S3 is used the solid uptake is the lowest. A possible explanation is that apart from affecting cell vitality the addition of the minerals influences the cell wall permeability. Furthermore it was possible to reduce the tissue softening by the use of any of the S2, S3 and S4 solutions as osmotic medium as long as the process temperature was ambient to moderate. Processing at 60 degrees C caused pronounced tissue softening irrespective of the osmotic medium used for the immersion of the apple tissue. (C) 2012 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Mass transfer, Osmotic medium composition, Calcium, Cell wall, Texture, Apple, Osmotic processing
in
Food Research International
volume
48
issue
2
pages
839 - 847
publisher
Elsevier
external identifiers
  • wos:000311185100064
  • scopus:84864122875
ISSN
0963-9969
DOI
10.1016/j.foodres.2012.06.034
language
English
LU publication?
yes
id
01967605-8a47-4b90-bb42-d0ed1a169807 (old id 3388531)
date added to LUP
2013-01-30 13:50:43
date last changed
2017-03-26 03:04:41
@article{01967605-8a47-4b90-bb42-d0ed1a169807,
  abstract     = {The effect of modification of osmotic medium composition with salts on the texture changes and process kinetics was evaluated in the present study. Inner and outer apple cortex parenchyma (Kim var.) was subjected to osmotic processing at 20.40 and 60 degrees C. The four osmotic media used were of identical osmotic pressure but slightly different compositions. The solution 1, Si, was a 50% w/w sucrose solution. The solution 2, S2, was 49.47% sucrose + 0.25% CaCl2. The solution 3, 53, was 48.27% sucrose + 0.5% CaCl2. The solution 4, 54, was 40.52% w/w sucrose + 0.50% w/w CaCl2 + 2% w/w NaCl. The solid gain and water loss were influenced by the initial structure (inner-outer cortex). The osmotic processing kinetics of the apple tissue revealed that both the water loss and the solid gain were influenced by the osmotic medium used. At each temperature when the Si medium is used the uptake of the solids is the highest, and when one of the S2 and S3 is used the solid uptake is the lowest. A possible explanation is that apart from affecting cell vitality the addition of the minerals influences the cell wall permeability. Furthermore it was possible to reduce the tissue softening by the use of any of the S2, S3 and S4 solutions as osmotic medium as long as the process temperature was ambient to moderate. Processing at 60 degrees C caused pronounced tissue softening irrespective of the osmotic medium used for the immersion of the apple tissue. (C) 2012 Elsevier Ltd. All rights reserved.},
  author       = {Mavroudis, Nikolaos E. and Gidley, Michael J. and Sjöholm, Ingegerd},
  issn         = {0963-9969},
  keyword      = {Mass transfer,Osmotic medium composition,Calcium,Cell wall,Texture,Apple,Osmotic processing},
  language     = {eng},
  number       = {2},
  pages        = {839--847},
  publisher    = {Elsevier},
  series       = {Food Research International},
  title        = {Osmotic processing: Effects of osmotic medium composition on the kinetics and texture of apple tissue},
  url          = {http://dx.doi.org/10.1016/j.foodres.2012.06.034},
  volume       = {48},
  year         = {2012},
}