Calcium-induced aggregation of phosphatidylcholine vesicles containing free oleic acid

1988 ◽  
Vol 46 (4) ◽  
pp. 259-266 ◽  
Author(s):  
Antonio Ortiz ◽  
Juan C. Gomez-Fernandez
Keyword(s):  
Oleic Acid ◽  
Free Oleic Acid ◽  
Induced Aggregation

Bionanomaterials: Thermal Stability of the Oleic Acid / alpha- and beta-cyclodextrin Complexes

2008 ◽  
Vol 59 (9) ◽  
Author(s):  
Daniel I. Hadaruga ◽  
Nicoleta G. Hadaruga ◽  
Anca Hermenean ◽  
Adrian Rivis ◽  
Vasile Paslaru ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Oleic Acid ◽  
Solution Method ◽  
Degradation Products ◽  
Water Solution ◽  
Fatty Acid Esters ◽  
Cyclodextrin Complexes ◽  
Free Oleic Acid ◽  
Thermal Stability Of ◽  
Acid Esters

This paper presents the thermal stability of the oleic acid encapsulated in a- and b - cyclodextrin. The complexation of the oleic acid was achieved by the ethanol-water solution method and the nanoparticles were analyzed by DSC. The free oleic acid and the encapsulated one were subjected to the thermal degradation in the range of 50-150�C and the degradation products were identified and quantified by GC-MS analysis of the fatty acid esters obtained by deriving with methanol/boron trifluoride, both for free compounds and for the encapsulated ones. The oleic acid complexes were very stable in this range of temperature.

Effect of Surfactant Excess in Non-Polar Ferrofluids Probed by Small-Angle Neutron Scattering

2009 ◽  
Vol 152-153 ◽  
pp. 198-201 ◽  
Author(s):  
V.I. Petrenko ◽  
M.V. Avdeev ◽  
V. L. Aksenov ◽  
L.A. Bulavin ◽  
L. Rosta
Keyword(s):  
Oleic Acid ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Free Acid ◽  
Magnetic Fluids ◽  
Particle Aggregation ◽  
Free Oleic Acid ◽  
The Stability ◽  
Pure Benzene

The microstructure of ferrofluids (magnetite/oleic acid/benzene) with an excess of free oleic acid is investigated by small-angle neutron scattering (SANS). For such excess higher than 25 vol. % a sharp break in the stability of ferrofluids occurs followed by coagulation and precipitation. Below this value the influence of the surfactant excess on the stability of ferrofluids is insignificant; neither particle aggregation nor surfactant agglomeration is observed. The interaction of free acid molecules in the ferrofluids is compared with that in pure benzene solutions. A significant increase in the attraction is observed for acid molecules in the ferrofluids, which is related to the loss of magnetic fluids stability at high excess of acid.

scholarly journals Acylation of lysolecithin in the intestinal mucosa of rats

1970 ◽  
Vol 118 (2) ◽  
pp. 241-246 ◽  
Author(s):  
P. V. Subbaiah ◽  
P. S. Sastry ◽  
J. Ganguly
Keyword(s):  
Oleic Acid ◽  
Fatty Acid ◽  
Palmitic Acid ◽  
Intestinal Mucosa ◽  
Brush Border ◽  
Chain Fatty Acid ◽  
Long Chain Fatty Acid ◽  
Free Oleic Acid ◽  
Acyl Acceptors ◽  
Long Chain

1. The presence of an active acyl-CoA–lysolecithin (1-acylglycerophosphorylcholine) acyltransferase was demonstrated in rat intestinal mucosa. 2. ATP and CoA were necessary for the incorporation of free [1-14C]oleic acid into lecithin (phosphatidylcholine). 3. The reaction was about 20 times as fast with [1-14C]oleoyl-CoA as with free oleic acid, CoA and ATP. 4. With 1-acylglycerophosphorylcholine as the acceptor, both oleic acid and palmitic acid were incorporated into the β-position of lecithin; the incorporation of palmitic acid was 60% of that of oleic acid. 5. Of the various analogues of lysolecithin tested as acyl acceptors from [1-14C]oleoyl CoA, a lysolecithin with a long-chain fatty acid at the 1-position was most efficient. 6. The enzyme was mostly present in the brush-border-free particulate fraction of the intestinal mucosa. 7. Of the various tissues of rats tested for the activity, intestinal mucosa was found to be the most active, with testes, liver, kidneys and spleen following it in decreasing order.

scholarly journals The composition of soap films

1925 ◽  
Vol 109 (749) ◽  
pp. 28-34 ◽  
Keyword(s):  
Oleic Acid ◽  
Degree Of Hydrolysis ◽  
Soap Bubble ◽  
X Rays ◽  
Soap Films ◽  
Potassium Oleate ◽  
Molecular Film ◽  
Black Spots ◽  
Free Oleic Acid ◽  
Hydrolysis Of

In a recent article on “The Investigation of Properties of Thin Films by X-rays,” Sir William Bragg discusses the nature and composition of soap films and the black spots that form therein, He proceeded from the assumption that “the ordinary thick film is bounded on one side by a molecular film of oleic acid,'' such acid being formed by the “hydrolysis of the sodium or potassium oleate in solution.” The brief experimental investigation outlined below, carried out with solutions of sodium oleate whose degree of hydrolysis is known, shows that free oleic acid does not exist in soap films, but sodium soap is stored in the surface of a soap solution or soap bubble.

Intestinal absorption of free oleic acid in the unanesthetized rat: evidence for a saturable component?

1984 ◽  
Vol 62 (9) ◽  
pp. 1136-1140 ◽  
Author(s):  
Daniel Hollander ◽  
San Laung Chow ◽  
Violetta D. Dadufalza
Keyword(s):  
Oleic Acid ◽  
Intestinal Absorption ◽  
Sodium Taurocholate ◽  
Water Layer ◽  
Unstirred Layer ◽  
Fatty Acid Binding Proteins ◽  
Fatty Acid Binding ◽  
Rate Of Absorption ◽  
Free Oleic Acid ◽  
Arachidonic Acids

The intestinal absorption of free oleic acid at low intraluminal concentrations and the influence of luminal factors on its absorption were studied in the unanesthetized rat. The relationship between oleic acid concentration (30–2500 μM) and its rate of absorptions fitted best to a rectangular hyperbola (y = x/(2.19 + 0.0015x), r = 0.94). Oleic acid's rate of absorption increased as the hydrogen ion and sodium taurocholate concentrations were increased or as the thickness and resistance of the unstirred water layer were diminished or following the addition of lysolecithin. The additions of the artificial detergent Tween-80, or lecithin and linoleic, linolenic and arachidonic acids to the perfusate decreased oleic acid's rate of absorption. It was concluded that oleic acid absorption in this range of concentrations displays apparent saturation kinetics which are due to unstirred layer effects, limited aqueous solubility of oleic acid and possible saturation of cytosol fatty acid binding proteins. Factors which increase oleic acid's protonated concentration or diminish the unstirred layer resistance, enhance its absorption rate, while factors which enhance its micellar solubility or interfere with its transfer out of the cell membrane decrease its overall rate of absorption.

Ultrastructural Characteristics of Platelets Separated from Plasma by ADP-Induced Aggregation

1976 ◽  
Vol 34 ◽  
pp. 164-165
Author(s):  
B.A. Shinoda ◽  
M.D. Hardison ◽  
S.F. Mohammad ◽  
H.Y.K. Chuang ◽  
R.G. Mason
Keyword(s):  
Blood Platelets ◽  
Gel Filtration ◽  
Differential Centrifugation ◽  
Ultrastructural Characteristics ◽  
Induced Aggregation

The utilization of blood platelets in experimentation frequently requires their separation from blood and subsequent resuspension in media of known composition. Several methods are available for preparation of isolated platelets (1-3) by differential centrifugation or gel filtration, but most methods are tedious and time consuming. Often platelets obtained by use of such methods are in a state different functionally and ultrastructurally from that of platelets in plasma (4).Recently Mohammad, Reddick, and Mason (5) reported a method in which platelets were separated from plasma by ADP-induced aggregation, washed several times, and then incubated in a carefully selected medium that resulted in deaggregation of platelets.

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