Hydrocarbon chain disorder in lipid bilayers

Yellin, N.; Levin, Ira W.

doi:10.1016/0005-2760(77)90137-0

Cited by 139 publications

(81 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The total change observed in this ratio in the temperature range of the GI1 phase is comparable with that observed in the pressure range of the GI1 phase (6). We therefore conclude that the increase in the H28801H2845 ratio observed in the present work is largely due to the increased interchain interaction rather than the decrease in the number of the gauche conformers in the acyl chains (7). The increase in interchain interaction with decreasing temperature is undoubtedly the result of the damping of the reorientational fluctuation as demonstrated by the temperature dependence of the widths of the depolarized and weakly polarized Raman bands.…”

Section: Discussionsupporting

confidence: 54%

“…According to the thermodynamic Clausius-Clapeyron relationship, one may predict that this latter gel-gel phase transition should also occur at low temperature and atmospheric pressure. Yellin and Levin (7) have studied the temperature dependence of the Raman spectrum of DMPC-water dispersions from temperatures slightly below that of the pretransition to about -180°C. No cooperative phase transition was found in this temperature region; however, an inflection point at -40°C in the plot of the peak height ratio between the antisymmetric and the symmetric CH, stretching bands was observed in their study and was attributed to the onset of the g a u c h e -t r a n s isomerization in the acyl chains.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A low-temperature structural phase transition in aqueous dimyristoyl phosphatidylcholine bilayers observed by Raman scattering

Wong¹,

Mantsch²

1982

Can. J. Chem.

View full text Add to dashboard Cite

. Can. J. Chem. 60, 2137 (1982). A new structural phase change at -60°C and atmospheric pressure was observed in the gel phase of aqueous DMPC dispersions. This gel-gel phase transition exhibits first-order characteristics and is equivalent to the phase transition observed at 2.6 kbar and 30°C. The decrease in temperature has analogous effects on the ordering of the acyl chains in DMPC as has the increase in pressure. The rigid interchain reorientational fluctuations in the gel phase are gradually damped with decreasing temperature and below -60°C the interchain orientation becomes highly ordered. On a observe un nouveau changement structural de phase 60°C et a la pression atmospherique dans la phase gel des dispersions aqueuses du CDMP. Cette transition de phase gel-gel a des caractCristiques d'ordre un et Cquivaut a la transition de phase observte a 2,6 kbar et 30°C. La diminution de temperature a des effets analogues sur I'agencement des chaines acyles du CDMP lorsque la pression augmente. Les fluctuations dans la reorientation entre chaines rigides de la phasegel sont amorties graduellement lorsque la temperature diminue; et en-dessous de -60"C, I'orientation entre les interchaines devient fortement ordonnee.[Traduit par le journal] Introduction Temperature-induced phase transitions in dimyristoyl phosphatidylcholine (DMPC) -water dispersions have been extensively studied (1-5). Two first-order phase transitions have been found at 24°C and 14°C and are generally referred to as the main transition and the pretransition, respectively. In a recent study (6) we have shown that the temperatureof the maintransition(T,,,) and thatofthe pretransition (T,) can be raised to 30°C by increasing the hydrostatic pressure to 0.15 and I kbar, respectively. In addition, a third first-order gel-gel phase transition was found at 2.6kbar and 30°C. According to the thermodynamic Clausius-Clapeyron relationship, one may predict that this latter gel-gel phase transition should also occur at low temperature and atmospheric pressure. Yellin and Levin (7) have studied the temperature dependence of the Raman spectrum of DMPC-water dispersions from temperatures slightly below that of the

show abstract

Section: Discussionsupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

A low-temperature structural phase transition in aqueous dimyristoyl phosphatidylcholine bilayers observed by Raman scattering

Wong¹,

Mantsch²

1982

Can. J. Chem.

View full text Add to dashboard Cite

show abstract

“…the shoulder band observed at 1420 cm-' in the Raman spectrum of the a form of sn-PP(0H) is absent in the corresponding spectrum of the a-polymorph of tripalmitin. This band has been shown to be a result of a methylene deformation mode and has been suggested to be indicative of lateral interchain interactions (Yellin and Levin 1977). Thus, it appears that both the r -and /I'-polymorphic forms of sn-PP(0H) possess such lateral chain interactions.…”

Section: Ruman Spectroscopymentioning

confidence: 96%

The polymorphism of diglycerides

et al. 1992

View full text Add to dashboard Cite

Abstract:The polymorphism of 1,3-dipalmitin, 1.2-dipalmitoyl-sn-glycerol, 1.2-dipalmitoyl-ruc-glycerol has been examined by X-ray diffraction, IR spectroscopy and Raman spectroscopy and differential scanning calorimetry. The respective spectra and thermographs are presented for these polymorphs. Optically active 1,2-diglycerides exhibit very different thermal behaviour from the optically inactive 1,2-diglycerides. A novel HPLC system was devised for the separation of the diglycerides.

show abstract

“…The C-H stretching (2800 -3000 cm Ϫ1 ) region of hydrocarbons has already been studied (18,19). The bands near 2850 and 2880 cm Ϫ1 are attributed to the CH 2 symmetric and asymmetric stretching modes.…”

Section: Figmentioning

confidence: 98%