Abstract：
:A comparative study of the polymorphism exhibited by the polymerizable, tubule-forming phospholipid 1,2-bis(10,12-tricosadiynoyl)-sn-glycero-3- phosphocholine (DC23PC) and its saturated analog 1,2-ditricosanoyl-sn-glycero-3-phosphocholine (DTPC) in aqueous suspension is reported. Differential scanning calorimetry (DSC), as well as freeze-fracture electron microscopy and Raman spectroscopy, have been used to study the influence on phase behavior of rigid diacetylene groups in the fatty acyl chains of a phosphatidylcholine. DTPC large multilamellar vesicle (MLV) and small unilamellar vesicle (SUV) suspensions were found to retain liposome morphology after chain crystallization had occurred. In marked contrast, diacetylenic DC23PC suspensions do not maintain liposomal morphology in converting to the low temperature phase. Large MLVs of DC23PC with outer diameters in excess of 1 micron convert to a gel phase with cylindrical or tubular morphology at 38 degrees C, just a few degrees below the lipid's chain melting temperature (TM(H), i.e. temperature of an endothermic event observed during a heating scan) of 43.1 degrees C. Unlike the large MLVs, small MLVs or SUVs of DC23PC, with diameters of 0.4 +/- 0.3 micron and 0.04 +/- 0.02 micron, respectively, exhibit metastability in the liquid-crystalline state for several tens of degrees below the chain melting temperature prior to converting to a gel phase which, by electron microscopy, manifests itself as extended multilamellar sheets. Raman data collected at TM(H) -40 degrees C demonstrate that the gel state formed by DC23PC is very highly ordered relative to that of DTPC, suggesting that special chain packing requirements are responsible for the novel phase behavior of DC23PC.
journal_name
Chem Phys Lipidsjournal_title
Chemistry and physics of lipidsauthors
Burke TG,Rudolph AS,Price RR,Sheridan JP,Dalziel AW,Singh A,Schoen PEdoi
10.1016/0009-3084(88)90092-8subject
Has Abstractpub_date
1988-10-01 00:00:00pages
215-30issue
3-4eissn
0009-3084issn
1873-2941pii
0009-3084(88)90092-8journal_volume
48pub_type
杂志文章abstract：:The hydration behaviour of equimolar mixtures of phospholipids and nonionic surfactants with different chain length was investigated by gravimetric sorption, NMR spectroscopy and X-ray diffraction. At the most hydration degrees investigated, the incorporation of nonionic surfactants in a phospholipid bilayer leads to ...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/j.chemphyslip.2009.12.005
更新日期：2010-03-01 00:00:00
abstract：:The role of membrane cholesterol as a crucial regulator in the structure and function of membrane proteins and receptors is well documented. However, there is a lack of consensus on the mechanism for such regulation. We have previously shown that the function of an important neuronal receptor, the serotonin1A receptor...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/j.chemphyslip.2016.02.004
更新日期：2016-03-01 00:00:00
abstract：:Lipoic acid-substituted phospholipids were synthesized from phosphatidyl cholines by exchanging the choline residue with a glycol group using phospholipase D, forming phosphatidylglycols, and coupling of lipoic acid (1,2-dithiolane-3-pentanoic acid) to the residual glycol hydroxyl group by esterification. The thermotr...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/0009-3084(93)90032-x
更新日期：1993-11-01 00:00:00
abstract：:Copper-induced peroxidation of liposomal palmitoyllinoleoyl-phosphatidylcholine (PLPC) is inhibited by alpha-tocopherol at micromolar concentrations. In our previous study we found that when the liposomes contain phosphatidylserine (PS), nanomolar concentrations of Toc were sufficient to inhibit peroxidation. In an at...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/j.chemphyslip.2007.08.001
更新日期：2007-12-01 00:00:00
abstract：:The 220 MHz PMR spectra of 143 non-conjugated alkenoic and alkynoic acids and esters are correlated so as to provide a method for the structural analysis of such compounds in general. The spectral data are explained in terms of long-range deshielding of the double bonds, triple bonds, acid and ester groups in the mole...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/0009-3084(75)90032-8
更新日期：1975-09-01 00:00:00
abstract：:We consider the situation of integral membrane proteins in a lipid bilayer matrix where the size of the polar group of the protein is important in determining the lateral packing of the proteins. We represent the cross-section of the protein hydrophobic core as a hexagon moving on a lattice, and represent the projecti...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/0009-3084(88)90041-2
更新日期：1988-04-01 00:00:00
abstract：:A fluorescence spectroscopy global data analysis environment is described. Within this analysis environment, multidimensional fluorescence decay data (time and frequency domains) can be analyzed in terms of a wide variety of photophysical models. A generalized compartmental analysis structure is utilized, where one ca...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/0009-3084(89)90052-2
更新日期：1989-06-01 00:00:00
abstract：:We examine the effects of cholesterol (Chol) on the mechanical properties of membranes consisting of 16:0/18:1 POPC lipid and of lipids with conjugated linoleic acid (CLA), cis-9/trans-11 CLA (C9T11) and trans-10/cis-12 CLA (T10C12). Atomistic molecular dynamics (MD) simulations of POPC-Chol and CLA-Chol mixtures at v...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/j.chemphyslip.2013.12.012
更新日期：2014-02-01 00:00:00
abstract：:X-ray diffraction data taken at high instrumental resolution were obtained for EPC and DMPC under various osmotic pressures, primarily at T = 30 degrees C. The headgroup thickness DHH was obtained from relative electron density profiles. By using volumetric results and by comparing to gel phase DPPC we obtain areas AE...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/s0009-3084(98)00068-1
更新日期：1998-09-01 00:00:00
abstract：:Eugenol and its related compounds are major active constituents of essential oils and have been extensively used as food flavoring agents with significant lipid peroxidation inhibition activity, highlighting the importance of understanding detailed molecular mechanisms behind their interactions with lipid bilayer. For...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/j.chemphyslip.2018.03.008
更新日期：2018-07-01 00:00:00
abstract：:The cell plasma membrane is a complex system, which is thought to be capable of exhibiting non-random lateral organization. Studies of live cells and model membranes have yielded mechanisms responsible for the formation, growth, and maintenance of nanoscopic heterogeneities, although the existence and mechanisms that ...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章,评审
doi：10.1016/j.chemphyslip.2013.02.012
更新日期：2013-05-01 00:00:00
abstract：:This article reviews the use of fluorescent lipids and free probes in the studies of lipid regular distribution in model membranes. The first part of this article summarizes the evidence and physical properties for lipid regular distribution in pyrene-labeled phosphatidylcholine (PC)/unlabeled PC binary mixtures as re...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章,评审
doi：10.1016/s0009-3084(02)00025-7
更新日期：2002-06-01 00:00:00
abstract：:The transformation between a gel and a fluid phase in dipalmitoyl-phosphatidylcholine (DPPC) bilayers has been simulated using a coarse grained (CG) model by cooling bilayer patches composed of up to 8000 lipids. The critical step in the transformation process is the nucleation of a gel cluster consisting of 20-80 lip...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/j.chemphyslip.2005.03.001
更新日期：2005-06-01 00:00:00
abstract：:The fertilising ability of human spermatozoa may be impaired by inflammations of the genital tract, although details of these processes are still unknown. Hypochlorous acid (HOCl), an important product of myeloperoxidase released from stimulated neutrophils, induces a concentration-dependent increase in externalisatio...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/j.chemphyslip.2005.02.015
更新日期：2005-06-01 00:00:00
abstract：:Determining the particle size and number of lipoprotein components found in blood plasma (HDL, LDL and VLDL) has become an important clinical tool in diagnosing risk of cardiovascular disease. Proton (1H) NMR spectroscopy methods to quantify lipoprotein particle subclasses have been advancing since NMR lineshape analy...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/j.chemphyslip.2020.104874
更新日期：2020-05-01 00:00:00
abstract：:The present study is aimed to characterize the electrostatic parameters of oil in water emulsion droplets composed of MCT (medium chain triglycerides), PL (phospholipids) and Poloxamer and containing increasing concentrations of the cationic lipid oleylamine (OA), in Hepes 20 mM pH 7.4. The initial zeta-potential data...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/j.chemphyslip.2004.04.003
更新日期：2004-08-01 00:00:00
abstract：:2',7'-Dichlorodihydrofluorescein diacetate (DCFH-DA) is commonly used to detect the generation of reactive oxygen intermediates and for assessing the overall oxidative stress in toxicological phenomenon. It has been suggested that DCFH-DA crosses the cell membrane, subsequently undergoing deacetylation by intracellula...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/j.chemphyslip.2004.04.006
更新日期：2004-08-01 00:00:00
abstract：:The reasons for lipid diversity in membranes are not understood. Here we review evidence supporting the proposal that factors related to the polymorphic capabilities of lipids provide a rationale for lipid diversity. In particular, the ability of lipids to adopt different polymorphic phases appears to be related to a ...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/0009-3084(86)90067-8
更新日期：1986-06-01 00:00:00
abstract：:The effect of peptides on bilayer----non-bilayer phase transitions can be used as a tool to investigate the molecular aspects of peptide-lipid interactions. In this contribution the action on membranes of the peptide antibiotic gramicidin A and the bee venom component melittin are compared. Although the known structur...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章,评审
doi：10.1016/0009-3084(91)90084-o
更新日期：1991-03-01 00:00:00
abstract：:The X-ray crystal structure of 3 beta-benzoyloxy-6 alpha-chloro-5 alpha-cholest-7-ene (IV) was determined by the heavy atom method and refined to R = 0.063 (space group P21, a = 11.364, b = 11.089, c = 12.232, beta = 99.43 degrees, Z = 2). IV was previously shown to be an important intermediate in the acid-catalyzed i...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/0009-3084(88)90051-5
更新日期：1988-08-01 00:00:00
abstract：:A new polymerizable surfactant, 12-methacryloyl dodecylphosphocholine (MDPC), has been synthesized using a three-step procedure in moderate yield. Phase transitions were characterized by DSC and phase behavior in water was determined by surface tension and polarizing microscopy. MDPC showed typical surfactant behavior...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/j.chemphyslip.2010.03.001
更新日期：2010-05-01 00:00:00
abstract：:The oligosaccharide chain of glycosphingolipids (GSLs) has a marked influence on their thermotropic behavior, intermolecular packing and surface electrical potential. The transition temperature and enthalpy of GSLs decrease proportionally to the complexity of the polar head group and show a linear dependence with the ...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章,评审
doi：10.1016/0009-3084(86)90042-3
更新日期：1986-12-15 00:00:00
abstract：:Isomeric diacylglycerophosphocholines containing various octadecynoic acids (4-, 6-, 9-, 12-, 14- and 17-octadecynoic acid) were synthesized and purified to homogeneity. Their behaviour in monolayers, when studied by the Langmuir-Blodgett film balance technique, revealed systematic relationships between structure and ...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/0009-3084(94)90086-8
更新日期：1994-04-19 00:00:00
abstract：:Parkinson's disease is caused due to free radical generation in dopamine neurons leading to oxidative stress induced damage. The aim of this work was to ameliorate the free radical induced oxidative stress in rats by using TPGS (Tocopheryl polyethylene glycol 1000 succinate) loaded rutin nanoemulsion after oral admini...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/j.chemphyslip.2020.104890
更新日期：2020-05-01 00:00:00
abstract：:Sphingolipids are recognized as signaling mediators in a growing number of pathways, and represent potential targets to address many diseases. The study of sphingolipid signaling in yeast has created a number of breakthroughs in the field, and has the potential to lead future advances. The aim of this article is to pr...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章,评审
doi：10.1016/j.chemphyslip.2013.10.006
更新日期：2014-01-01 00:00:00
abstract：:A new scheme for synthesis of saturated 1-O-alkyl-2-O-methyl-rac-glycerolipids is described. The reductive cleavage of 2-O-methyl-1,3-O,O-benzylideneglycerol with BH3.THF complex leads to 1-O-benzyl-2-O-methyl-rac-glycerol, which is a key in intermediate for the facile preparation of 1-O-alkyl-2-O-methyl-rac-glycerol ...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/0009-3084(91)90026-8
更新日期：1991-10-01 00:00:00
abstract：:DNA interactions with the bilayers of cationic liposomes were studied using a novel model experiment: DNAs were locally injected by a micropipette to a part of a giant unilamellar vesicle. The resulting phenomena were directly observed in optical microscope. Giant unilamellar vesicles (GUVs), about 100 microm in diame...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/s0009-3084(99)00060-2
更新日期：1999-08-01 00:00:00
abstract：:The 3-sulfates of the S-acyl glutathione (GSH) conjugates of five natural bile acids (cholic, chenodeoxycholic, deoxycholic, ursodeoxycholic, and lithocholic) were synthesized as reference standards in order to investigate their possible formation by a rat liver cytosolic fraction. Their structures were confirmed by p...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/j.chemphyslip.2012.02.001
更新日期：2012-04-01 00:00:00
abstract：:The in vitro effect of apolipoprotein C-II (apo C-II) on the apolipoprotein C-III (apo C-III) induced activation of bovine milk lipoprotein lipase (LPL) was studied in vitro using a synthetic substrate. Apo C-III effectively inhibited, in a dose-dependent manner, the activation of lipoprotein lipase induced by apo C-I...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/0009-3084(87)90038-7
更新日期：1987-10-01 00:00:00
abstract：:Ceramides with chemically modified polar headgroups were prepared and examined for their ability to form complex high axial ratio microstructures (CHARMS), potential drug delivery vehicles. In general, if the modified ceramide had either a hydrogen bond donor or acceptor at C-1 and C-3, including hydrophobic or hydrop...
journal_title：Chemistry and physics of lipids
pub_type： 杂志文章
doi：10.1016/s0009-3084(00)00204-8
更新日期：2001-01-01 00:00:00
