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Author Milch, R. A.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CHEMISTRY ♦ AMIDES ♦ AMINO ACIDS ♦ BINDING ENERGY ♦ CARBONYLS ♦ COLLOIDS ♦ DEUTERIUM COMPOUNDS ♦ FREQUENCY ♦ GELATINE ♦ INFRARED RADIATION ♦ PEPTIDES ♦ ROTATION ♦ SOL-GEL PROCESS ♦ SOLUTIONS ♦ SPECTRA ♦ TEMPERATURE
Abstract S>Studies were made to determine whether or not the infrared spectra of deuterated gelatin sols could be obtained, especially during the course of genatin sol-gel transition. Significant spectral changes during the sol-gel transition were obviously detectable primarily in the region above 3000 cm/sup -1/ . Concomitant changes also occurred at about 1550 cm/sup -1/ and in the amide I band (deuterium-bonded carbonyl C -O stretching vibration at about 1625 cm/sup -1/ ), amide II band (in-plane N--D bending mode + C = N stretching mode of the peptide group at about 1445 cm/sup -1/). Only slight increase in intensity was observed in the band about 1330 cm/sup -1/ in consequence of the temperature effect. The spectral data are thus in accord with the long postulated hypothesis concerning the reversible formation of a systematic set of hydrogen bonds along and between the crystalline portions of gelatin polypeptide chains during the temperature-dependent mutarotation processes of the gelatin sol-gel transition. (P.C.H.)
Educational Use Research
Learning Resource Type Article
Publisher Date 1964-04-01
Publisher Department Johns Hopkins Univ., Baltimore
Journal Nature
Volume Number 201
Organization Johns Hopkins Univ., Baltimore


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