Please use this identifier to cite or link to this item:
Title: Proton NMR based investigation of the effects of temperature and NaCl on micellar properties of CHAPS
Authors: Qin, X.
Liu, M.
Zhang, X.
Yang, D. 
Issue Date: 10-Mar-2011
Citation: Qin, X.,Liu, M.,Zhang, X.,Yang, D. (2011-03-10). Proton NMR based investigation of the effects of temperature and NaCl on micellar properties of CHAPS. Journal of Physical Chemistry B 115 (9) : 1991-1998. ScholarBank@NUS Repository.
Abstract: The effects of temperature and NaCl on the micellization of CHAPS, a zwitterionic detergent widely used in membrane protein studies, have been investigated by NMR spectroscopy. We found that the two apparent critical micelle concentration (cmc) values of CHAPS decrease with the increase of temperature, as well as the NaCl concentration. The thermodynamic parameters derived from the temperature-dependent cmc values show that the micellization process is spontaneous and exothermic, and the van der Waals interaction is likely to be the main factor for the micellization of CHAPS. The micellar hydrodynamic radii remain almost the same in a range of 100-600 mM NaCl, indicating that the aggregate states of CHAPS are not sensitive to the change of the surrounding conditions. In addition, the dependence of nuclear Overhauser effect (NOE) intensities on temperatures further demonstrates the existence of the unique staggered micellar structure of CHAPS at a concentration above the apparent second cmc, which was suggested in our previous work. Our results provide a basis for optimizing CHAPS concentration in the solubilization or stabilization of membrane proteins under nondenaturing conditions and may be helpful to understand its interaction with proteins. © 2011 American Chemical Society.
Source Title: Journal of Physical Chemistry B
ISSN: 15206106
DOI: 10.1021/jp108694v
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Nov 8, 2018

Page view(s)

checked on Aug 17, 2018

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.