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Relationship between the electrical and rheological properties of potato tuber tissue after various forms of processing

Dejmek, Petr LU and Miyawaki, Osato (2002) In Bioscience, Biotechnology and Biochemistry 66(6). p.1218-1223
Abstract
The impedance at frequencies of 1-1000 kHz and dynamic bending storage modulus measured by the vibrating reed method were compared for potato tuber tissue, which had been processed by various methods. Raw potato tuber tissue strips were either heated for 30 min up to 100°C or frozen-thawed. Some samples were osmotically dehydrated in a mannitol solution up to a concentration of 0.7 mol/l. The electrical reactance correlated well with the storage modulus of heated or frozen-thawed potato tissues, but not with the storage modulus of the mannitol-treated tissue. The storage modulus appeared to be strongly dependent on the turgor pressure of the cells which was drastically decreased by the heating, freezing-thawing, and osmotic treatments. The... (More)
The impedance at frequencies of 1-1000 kHz and dynamic bending storage modulus measured by the vibrating reed method were compared for potato tuber tissue, which had been processed by various methods. Raw potato tuber tissue strips were either heated for 30 min up to 100°C or frozen-thawed. Some samples were osmotically dehydrated in a mannitol solution up to a concentration of 0.7 mol/l. The electrical reactance correlated well with the storage modulus of heated or frozen-thawed potato tissues, but not with the storage modulus of the mannitol-treated tissue. The storage modulus appeared to be strongly dependent on the turgor pressure of the cells which was drastically decreased by the heating, freezing-thawing, and osmotic treatments. The electrical properties reflect the cell integrity, and a large difference was observed between the change in impedance after heating or freezing-thawing, and that after the osmotic treatment. A significant change in the electric properties was also observed for a starch suspension at the gelatinization temperature. However, the contribution due to gelatinization did not appear to play an important role in the change of electrical properties of potato tissue by heating. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
impedance, storage modulus, vibrating reed, heat processing, osmotic dehydration
in
Bioscience, Biotechnology and Biochemistry
volume
66
issue
6
pages
1218 - 1223
publisher
Japan Society for Bioscience, Biotechnology, and Agrochemistry
external identifiers
  • scopus:0036617866
ISSN
1347-6947
DOI
10.1271/bbb.66.1218
language
English
LU publication?
yes
id
aa1b0360-143b-4c11-9043-db99e884a9db (old id 747412)
date added to LUP
2007-12-13 16:11:03
date last changed
2017-08-13 03:42:40
@article{aa1b0360-143b-4c11-9043-db99e884a9db,
  abstract     = {The impedance at frequencies of 1-1000 kHz and dynamic bending storage modulus measured by the vibrating reed method were compared for potato tuber tissue, which had been processed by various methods. Raw potato tuber tissue strips were either heated for 30 min up to 100°C or frozen-thawed. Some samples were osmotically dehydrated in a mannitol solution up to a concentration of 0.7 mol/l. The electrical reactance correlated well with the storage modulus of heated or frozen-thawed potato tissues, but not with the storage modulus of the mannitol-treated tissue. The storage modulus appeared to be strongly dependent on the turgor pressure of the cells which was drastically decreased by the heating, freezing-thawing, and osmotic treatments. The electrical properties reflect the cell integrity, and a large difference was observed between the change in impedance after heating or freezing-thawing, and that after the osmotic treatment. A significant change in the electric properties was also observed for a starch suspension at the gelatinization temperature. However, the contribution due to gelatinization did not appear to play an important role in the change of electrical properties of potato tissue by heating.},
  author       = {Dejmek, Petr and Miyawaki, Osato},
  issn         = {1347-6947},
  keyword      = {impedance,storage modulus,vibrating reed,heat processing,osmotic dehydration},
  language     = {eng},
  number       = {6},
  pages        = {1218--1223},
  publisher    = {Japan Society for Bioscience, Biotechnology, and Agrochemistry},
  series       = {Bioscience, Biotechnology and Biochemistry},
  title        = {Relationship between the electrical and rheological properties of potato tuber tissue after various forms of processing},
  url          = {http://dx.doi.org/10.1271/bbb.66.1218},
  volume       = {66},
  year         = {2002},
}