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Titolo:
HYDROPHOBIC HYDRATION ANALYSIS ON AMINO-ACID SOLUTIONS BY THE MICROWAVE DIELECTRIC METHOD
Autore:
SUZUKI M; SHIGEMATSU J; FUKUNISHI Y; KODAMA T;
Indirizzi:
AGCY IND SCI & TECHNOL,MECH ENGN LAB,NATL INST ADV INTERDISCIPLINARY RES,1-1-4 HIGASHI TSUKUBA IBARAKI 305 JAPAN TOHOKU UNIV,GRAD SCH ENGN,DEPT MET,AOBA KU SENDAI MIYAGI 98077 JAPAN RUTGERS STATE UNIV,DEPT CHEM PISCATAWAY NJ 08855 KYUSHU INST TECHNOL IIZUKA FUKUOKA 820 JAPAN
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 19, volume: 101, anno: 1997,
pagine: 3839 - 3845
SICI:
1089-5647(1997)101:19<3839:HHAOAS>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTERFACIAL POLARIZATION; MOLECULAR-DYNAMICS; FREE-ENERGY; WATER; DIPEPTIDE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
17
Recensione:
Indirizzi per estratti:
Citazione:
M. Suzuki et al., "HYDROPHOBIC HYDRATION ANALYSIS ON AMINO-ACID SOLUTIONS BY THE MICROWAVE DIELECTRIC METHOD", JOURNAL OF PHYSICAL CHEMISTRY B, 101(19), 1997, pp. 3839-3845

Abstract

Hydrophobic hydration was studied by the microwave dielectric method,which has been developed to separate the rotational relaxation of restrained water by hydrophobic side chains from the dielectric spectrum of an amino acid solution. Measurements were taken with a precision microwave network analyzer and a thermostated glass cell at 20.0 +/- 0.01 degrees C with an open-end flat-surface coaxial probe. Examined amino acids were glycine, alanine, alpha-aminobutylic acid, norvaline, valine, norleucine, isoleucine, leucine, and phenylalanine. The present method assumes that the dielectric spectrum of an amino acid solution is approximated with that of a solute/water emulsion containing two kinds of spherical solutes having different Debye-type relaxation frequencies. We found that in straight alkyl side chains of tested amino acids, each -CH2- restrains three water molecules on average and its hydration shell has a relaxation frequency f(c) around 5.5 GHz, while branched alkyl side chains restrain less than the straight ones and their hydration shells have a slightly lower f(c) of 4.1-4.4 GHz. The f(c) ofthe hydration shell of a phenylalanine side chain is 4.0 GHz and the phenyl group restrains nearly six water molecules, indicating a ratherhydrophilic nature. The static dielectric constant of the hydrophobichydration shell was found to be around 110, which is higher than thatof bulk water.

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Documento generato il 24/09/20 alle ore 02:02:06