13C NMR Spin-lattice relaxation study of carbonyl carbon-water interaction in the Aerosol OT reversed micelles

1994 ◽  
Vol 98 (28) ◽  
pp. 7036-7040 ◽  
Author(s):  
Akihiro Yoshino ◽  
Hirofumi Okabayashi ◽  
Tadayoshi Yoshida
Keyword(s):  
13C Nmr ◽  
Lattice Relaxation ◽  
Reversed Micelles ◽  
Spin Lattice Relaxation ◽  
Carbonyl Carbon ◽  
Aerosol Ot ◽  
Spin Lattice ◽  
Water Interaction ◽  
Relaxation Study

13C NMR of study of entrapping proteins (α-chymotrypsin) into reversed micelles of surfactants (aerosol OT) in organic solvents (n-octane)

1989 ◽  
Vol 54 (4) ◽  
pp. 1126-1134 ◽  
Author(s):  
Yurii E. Shapiro ◽  
Nikolai A. Budanov ◽  
Andrei V. Levashov ◽  
Nataliya L. Klyachko ◽  
Yurii L. Khmelnitsky ◽  
...  
Keyword(s):  
Relaxation Times ◽  
Fold Increase ◽  
Lattice Relaxation ◽  
Protein Molecule ◽  
Reversed Micelles ◽  
Spin Lattice Relaxation ◽  
Experimental Conditions ◽  
Aerosol Ot ◽  
Spin Lattice ◽  
Recovery Technique

Hydrated reversed micelles of Aerosol OT (AOT) in octane have been studied by 13C NMR spectroscopy. The changes of spin-lattice relaxation times (T1) for individual segments of the AOT molecule, induced by entrapping a protein (α-chymotrypsin) into the micelle, have been determined by the inversion-recovery technique. The dramatic (three-fold) increase of T1 found for the α-CH2 groups in the AOT molecules indicates that (unlike in the unfilled micelle) in the protein-containing micelle the boundary of the water cavity is shifted outward (0.5-0.7 nm, under the given experimental conditions), the alkyl chains of the surfactant being “flooded” by water molecules. This observation explains why the outer size of the reversed micelle does not change on insertion of a bulky protein molecule.

scholarly journals A 13C NMR Spin-Lattice Relaxation Study of the Ion Pairing and Aggregation of Lithium Indenide.

1989 ◽  
Vol 43 ◽  
pp. 275-279 ◽  
Author(s):  
Tore Lejon ◽  
Ulf Edlund ◽  
Curt R. Enzell ◽  
Tore Pettersson ◽  
A. J. Kondow ◽  
...  
Keyword(s):  
13C Nmr ◽  
Ion Pairing ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Relaxation Study
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