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Dielectric relaxation of collagen in aqueous solutions

✍ Scribed by Shin'ichiro Umemura; Masanori Sakamoto; Reinosuke Hayakawa; Yasaku Wada

Publisher
Wiley (John Wiley & Sons)
Year
1979
Tongue
English
Weight
462 KB
Volume
18
Category
Article
ISSN
0006-3525

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✦ Synopsis

The complex dielectric constant of collagen in aqueous solutions (polymer concentration, C, = 0.02-0.2%) was measured a t 10°C in the frequency range from 3 Hz to 30 kHz. The loss peak for C, = 0.02% is located a t 90 Hz and the dielectric relaxation time rn is estimated to be 1.8 f 0.3 msec. The TL) agrees well with the rotational relaxation time estimated from the reduced viscosity, and the relaxation is ascribed to the end-over-end rotation of the molecule. The C, dependence of TD and the dielectric increment Ac are interpreted in terms of the aggregation of molecules. The dipole moment of a molecule, obtained from Ac at C, = 0.02% and pH 6.5, is (5.2 f 0.2) X 104D, which is explained by the asymmetrical distribution of the ionized side chains of the molecule.

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