HYDRATION OF POLYACIDS

被引:48
作者
IKEGAMI, A
机构
[1] Department of Physics, Faculty of Science, Nagoya University, Nagoya
关键词
D O I
10.1002/bip.1968.360060314
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The hydration of several polyacids has been investigated with special attention to the effects of neighboring charged groups and hydrophobic groups on the hydration regions. The molar volume change due to the structural change of water by the hydration was obtained by the method of refractivity measurement. The polyacids employed were poly(acrylic acid), poly(methacrylic acid), poly(L‐glutamic acid), and a copolymer of maleic acid and vinyl acetate. The measurement of the refractive index was performed for the solutions of these polymers neutralized to varying degrees by tetrabutyl‐ammonium hydroxide and sodium hydroxide. The results confirm the characteristics of the previous model of the hydration of polyelectrolytes, that is, the cooperative action of neighboring charged groups induce the second hydration region in addition to the intrinsic hydration region. The stiff structure of water in these regions restricts the mobility of counterions forced to enter into these regions by the strong electrostatic potential of polyions. The results indicate also that hydrophobic groups induce an additional hydration region around their neighboring charged groups. Small but negative volume changes were observed for conformational changes of poly(L‐glutamic acid) and poly(methacrylic acid) induced by the neutralization of carboxyl groups. Copyright © 1968 John Wiley & Sons, Inc.
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页码:431 / &
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共 11 条
[1]   POLYPEPTIDES .3. THE SYNTHESIS OF HIGH MOLECULAR WEIGHT POLY-GAMMA-BENZYL-L-GLUTAMATES [J].
BLOUT, ER ;
KARLSON, RH .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1956, 78 (05) :941-946
[2]   VISCOMETRIC AND CONDUCTOMETRIC TITRATIONS OF POLYMETHACRYLIC ACID WITH ALKALI METAL AND QUATERNARY AMMONIUM BASES [J].
GREGOR, HP ;
GOLD, DH ;
FREDERICK, M .
JOURNAL OF POLYMER SCIENCE, 1957, 23 (103) :467-475
[3]   POTENTIOMETRIC TITRATION OF POLYACRYLIC AND POLYMETHACRYLIC ACIDS WITH ALKALI METAL AND QUATERNARY AMMONIUM BASES [J].
GREGOR, HP ;
FREDERICK, M .
JOURNAL OF POLYMER SCIENCE, 1957, 23 (103) :451-465
[4]   POLYPEPTIDES .21. HIGH MOLECULAR WEIGHT POLY-ALPHA,L-GLUTAMIC ACID - PREPARATION AND OPTICAL ROTATION CHANGES [J].
IDELSON, M ;
BLOUT, ER .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1958, 80 (17) :4631-4634
[5]   HYDRATION + ION BINDING OF POLYELECTROLYTES [J].
IKEGAMI, A .
JOURNAL OF POLYMER SCIENCE PART A-GENERAL PAPERS, 1964, 2 (2PA) :907-&
[6]   VOLUME CHANGES IN PROTEIN REACTIONS .2. COMPARISON OF IONIZATION REACTIONS IN PROTEINS AND SMALL MOLECULES [J].
KAUZMANN, W ;
BODANSZKY, A ;
RASPER, J .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1962, 84 (10) :1777-&
[7]   POTENTIOMETRIC BEHAVIOR OF POLYMETHACRYLIC ACID [J].
LEYTE, JC ;
MANDEL, M .
JOURNAL OF POLYMER SCIENCE PART A-GENERAL PAPERS, 1964, 2 (4PA) :1879-&
[8]   CONFORMATIONAL TRANSITION OF POLY(METHACRYLIC ACID) IN SOLUTION [J].
MANDEL, M ;
LEYTE, JC ;
STADHOUDER, MG .
JOURNAL OF PHYSICAL CHEMISTRY, 1967, 71 (03) :603-+
[9]   DILATOMETRIC AND REFRACTOMETRIC STUDIES OF THE HELIX-COIL TRANSITION OF POLY-L-GLUTAMIC ACID IN AQUEOUS SOLUTION [J].
NOGUCHI, H ;
YANG, JT .
BIOPOLYMERS, 1963, 1 (04) :359-370
[10]   VOLUME CHANGES AS A CRITERION FOR SITE BINDING OF COUNTERIONS BY POLYELECTROLYTES [J].
STRAUSS, UP ;
LEUNG, YP .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1965, 87 (07) :1476-&