TY - JOUR
T1 - Interactions between xenon and phospholipid bicelles studied by 2H/ 129Xe/ 131Xe NMR and optical pumping of nuclear spins
AU - Li, Xiaoxia
AU - Newberry, Caitlin
AU - Saha, Indrajit
AU - Nikolaou, Panayiotis
AU - Whiting, Nicholas
AU - Goodson, Boyd M.
N1 - Funding Information:
We thank Matthew Rosen (HSCfA) for design assistance regarding our OP cell and apparatus, and thank Mark Conradi and Jason Leawoods (WUSTL) for helpful discussions. We also thank John Logan (San Jose State) for helpful correspondence, Bill Stevens (SIUC) for loaning the probe used in the 131 Xe experiments, and Ken Owens (UMSL) for his expert glassblowing. B.M.G. is a Cottrell Scholar of Research Corporation. Work at SIUC is supported by NSF (CAREER Award CHE-03492550, and CHE-90421012), the ACS Petroleum Research Fund, the Oak Ridge Associated Universities, Research Corporation, SIU MTC, and SIUC ORDA.
PY - 2006/2/15
Y1 - 2006/2/15
N2 - The interactions between xenon and DMPC/DHPC bicelles (q = 3.5%, 7.5% w/v) were studied via 2H, 129Xe, 131Xe, and optically enhanced 129Xe NMR. The chemical shifts, linewidths, and quadrupolar couplings of the xenon/bicelle NMR signals were correlated with different regions of the bicellar phase diagram. The addition of xenon (<70 mM) was observed to reduce the temperature-onset of bicelle alignment by several degrees, in quantitative agreement with effects previously observed with chloroform; however, the stable liquid-crystalline range was not significantly reduced. Preliminary laser-polarized xenon/bicelle studies yielded 129Xe T 1 values of ∼120 s, long enough to permit a variety of planned experiments.
AB - The interactions between xenon and DMPC/DHPC bicelles (q = 3.5%, 7.5% w/v) were studied via 2H, 129Xe, 131Xe, and optically enhanced 129Xe NMR. The chemical shifts, linewidths, and quadrupolar couplings of the xenon/bicelle NMR signals were correlated with different regions of the bicellar phase diagram. The addition of xenon (<70 mM) was observed to reduce the temperature-onset of bicelle alignment by several degrees, in quantitative agreement with effects previously observed with chloroform; however, the stable liquid-crystalline range was not significantly reduced. Preliminary laser-polarized xenon/bicelle studies yielded 129Xe T 1 values of ∼120 s, long enough to permit a variety of planned experiments.
UR - http://www.scopus.com/inward/record.url?scp=31544438273&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=31544438273&partnerID=8YFLogxK
U2 - 10.1016/j.cplett.2005.11.086
DO - 10.1016/j.cplett.2005.11.086
M3 - Article
AN - SCOPUS:31544438273
SN - 0009-2614
VL - 419
SP - 233
EP - 239
JO - Chemical Physics Letters
JF - Chemical Physics Letters
IS - 1-3
ER -