TITLE

Broadband Dielectric Spectroscopy of Albumin-Water Mixture in Frozen State

AUTHOR(S)
Yokoyama, A.; Ishikawa, H.; Shinohara, M.; Shinyashiki, N.; Yagihara, S.; Hayashi, Y.
PUB. DATE
May 2006
SOURCE
AIP Conference Proceedings;2006, Vol. 832 Issue 1, p163
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Broadband dielectric spectroscopy (BDS) measurements of 40 wt% bovine serum albumin (BSA)-water mixture under frozen state were carried out in the frequency range of 20Hz to 1.8GHz in the temperature range of -70 to -4°C. Three relaxation processes were observed in addition to the low frequency electrode polarization and contribution of dc conductivity. The relaxation process observed in a frequency range higher than 1 MHz is due to the unfrozen water in the frozen BSA-water mixture. The relaxation process due to ice was observed in the frequency range of 100 Hz to 10kHz. Another relaxation process, which was observed in the frequency range below 1 Hz at -70°C, shifted to higher frequencies with temperature increases and reached up to 1 MHz at just below the melting temperature. This highly thermal-activated process is probably concerned with the molecular motion of BSA and/or ionic relaxation processes under frozen BSA-water mixture. © 2006 American Institute of Physics
ACCESSION #
20924364

 

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