Calcium Oxalate Monohydrate Precipitation at Phospholipid Monolayer Phase Boundaries

2004 ◽  
Vol 823 ◽  
Author(s):  
Isa O. Benítez ◽  
Daniel R. Talham
Keyword(s):  
Calcium Oxalate ◽  
Phase Boundary ◽  
Langmuir Monolayers ◽  
Calcium Oxalate Monohydrate ◽  
Brewster Angle ◽  
Crystal Formation ◽  
Brewster Angle Microscopy ◽  
Phase Boundaries ◽  
Phospholipid Monolayer

AbstractThe precipitation of calcium oxalate monohydrate (COM) was observed at biphasic phospholipid Langmuir monolayers with the aid of Brewster angle microscopy. COM appears preferentially at phase boundaries of a monolayer of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) in a state of liquid expanded/liquid condensed coexistance. However, when the phase boundary is created by two different phospholipids that are phase segregated, such as DPPC and 1,2-dimiristoyl-sn-glycero-3-phosphocholine (DMPC), crystal formation occurs away from the interface. It is suggested that COM growth at phase boundaries is preferred only when there is molecular exchange between the phases.

Direct Observation of Calcium Oxalate Monohydrate Precipitation at Phospholipid Monolayers with Brewster Angle Microscopy

2003 ◽  
Vol 774 ◽  
Author(s):  
Isa O. Benítez ◽  
Rénal Backov ◽  
Saeed R. Khan ◽  
Daniel R. Talham
Keyword(s):  
Calcium Oxalate ◽  
Calcium Oxalate Monohydrate ◽  
Brewster Angle ◽  
Brewster Angle Microscopy ◽  
Phase Boundaries ◽  
Phospholipid Monolayers ◽  
Bright Spots ◽  
Two Phases ◽  
Scanning Electron

AbstractThe precipitation of calcium oxalate monohydrate (COM) at phospholipid monolayers has been observed in-situ by Brewster angle microscopy (BAM). A monolayer of 1,2-dipalmitoylsn-glycero-3-phosphocholine (DPPC) compressed to a LC state over a calcium oxalate subphase shows the growth of COM as very bright spots. The identity of COM was confirmed in a transferred film by scanning electron microscopy. BAM can also be used to determine where COM precipitates when the monolayer has two phases at equilibrium. Monolayers of DPPC and 1,2-dipalmitoyl-sn-glycero-3-[phospho-rac-(1-glycerol)] (DPPG) crystallize COM at phase boundaries. In addition, phase separated binary phospholipid mixtures of DPPC and 1,2-dimiristoyl-sn-glycero-3-phosphocholine (DMPC) have been prepared and monitored by BAM. The crystal growth in this case is confined to domains of DPPC due to its ability to form a liquid condensed phase.

Characterization of Langmuir-monolayers of molecular clips by means of Brewster-angle-microscopy

2005 ◽  
Vol 284 (1) ◽  
pp. 44-50 ◽  
Author(s):  
P. Degen ◽  
H. Rehage ◽  
F. -G. Klärner ◽  
J. Polkowska
Keyword(s):  
Langmuir Monolayers ◽  
Brewster Angle ◽  
Brewster Angle Microscopy ◽  
Molecular Clips

Optical measurements of the phase diagrams of Langmuir monolayers of fatty acid, ester, and alcohol mixtures by Brewster-angle microscopy

1997 ◽  
Vol 106 (5) ◽  
pp. 1913-1920 ◽  
Author(s):  
Ellis Teer ◽  
Charles M. Knobler ◽  
Carsten Lautz ◽  
Stefan Wurlitzer ◽  
John Kildae ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Phase Diagrams ◽  
Fatty Acid Ester ◽  
Acid Ester ◽  
Langmuir Monolayers ◽  
Brewster Angle ◽  
Optical Measurements ◽  
Brewster Angle Microscopy ◽  
Alcohol Mixtures

Orientational Changes of Amphotericin B in Langmuir Monolayers Observed by Brewster Angle Microscopy

Langmuir ◽  
2001 ◽  
Vol 17 (5) ◽  
pp. 1477-1482 ◽  
Author(s):  
J. Miñones, ◽  
C. Carrera ◽  
P. Dynarowicz-Ła̧tka ◽  
J. Miñones ◽  
O. Conde ◽  
...  
Keyword(s):  
Amphotericin B ◽  
Langmuir Monolayers ◽  
Brewster Angle ◽  
Brewster Angle Microscopy

scholarly journals Head-group Dependent Domain Morphologies in Langmuir Monolayers

1970 ◽  
Vol 46 (1) ◽  
pp. 47-52
Author(s):  
MM Hossain ◽  
T Kato
Keyword(s):  
Phase Transition ◽  
Langmuir Monolayers ◽  
Brewster Angle ◽  
Head Group ◽  
Critical Surface ◽  
Brewster Angle Microscopy ◽  
Head Groups ◽  
Air Water Interface ◽  
Surface Morphologies ◽  
Internal Texture

The effect of head groups on the thermodynamic properties and morphological features of the domains formed in the Langmuir monolayers at 10 oC has been investigated by a film balance and a Brewster angle microscopy (BAM). 2-hydroxyethyl myristate (2-HEM) and n-tetradecanoyl N-ethanolamide (NHEA-14), having the same chain length but different head groups have been taken as amphiphiles. Both the amphiphiles represent a first-order LE-LC phase transition at 10 oC at the air-water interface. The critical surface pressure necessary for this phase transition is 6.0 mN/m for 2-HEM and 1.0 mN/m for NHEA-14. The surface morphologies of the domains are entirely different. The domains of 2-HEM are circular having internal texture, while those of NHEA-14 are dendritic having directional characteristics. The presence of interfacial hydrogen bonding in the latter amphiphile should be responsible for the formation of such characteristic domains in the case of latter amphiphile. Key words: Langmuir monolayers; Phase transition; Brewster angle microscopy; 2-hydroxyethyl myristate; n-tetradecanoyl Nethanolamide. DOI: http://dx.doi.org/10.3329/bjsir.v46i1.8104 Bangladesh J. Sci. Ind. Res. 46(1), 47-52, 2011

Stepwise Collapse of Cyclolinear Polysiloxane Langmuir Monolayers Studied by Brewster Angle Microscopy and Grazing Incidence X-ray Diffraction

2004 ◽  
Vol 37 (13) ◽  
pp. 4872-4881 ◽  
Author(s):  
Yu. K. Godovsky ◽  
G. Brezesinski ◽  
J. Ruiz-Garcia ◽  
H. Möhwald ◽  
T. R. Jensen ◽  
...  
Keyword(s):  
Langmuir Monolayers ◽  
Grazing Incidence ◽  
Brewster Angle ◽  
Brewster Angle Microscopy ◽  
X Ray Diffraction ◽  
X Ray
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