The preparation and plasticizing characteristics of pipendides of long chain fatty acids and n-fatty acyl derivatives of other cyclic imines

SUMMARY The processes that govern the regulated transport of long-chain fatty acids across the plasma membrane are quite distinct compared to counterparts involved in the transport of hydrophilic solutes such as sugars and amino acids. These differences stem from the unique physical and chemical properties of long-chain fatty acids. To date, several distinct classes of proteins have been shown to participate in the transport of exogenous long-chain fatty acids across the membrane. More recent work is consistent with the hypothesis that in addition to the role played by proteins in this process, there is a diffusional component which must also be considered. Central to the development of this hypothesis are the appropriate experimental systems, which can be manipulated using the tools of molecular genetics. Escherichia coli and Saccharomyces cerevisiae are ideally suited as model systems to study this process in that both (i) exhibit saturable long-chain fatty acid transport at low ligand concentrations, (ii) have specific membrane-bound and membrane-associated proteins that are components of the transport apparatus, and (iii) can be easily manipulated using the tools of molecular genetics. In both systems, central players in the process of fatty acid transport are fatty acid transport proteins (FadL or Fat1p) and fatty acyl coenzyme A (CoA) synthetase (FACS; fatty acid CoA ligase [AMP forming] [EC 6.2.1.3]). FACS appears to function in concert with FadL (bacteria) or Fat1p (yeast) in the conversion of the free fatty acid to CoA thioesters concomitant with transport, thereby rendering this process unidirectional. This process of trapping transported fatty acids represents one fundamental mechanism operational in the transport of exogenous fatty acids.

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Polymerizable derivatives of long-chain fatty acids. VII. Copolymerization of vinyl acetate with some long-chain vinyl esters

Journal of Polymer Science ◽

10.1002/pol.1952.120090602 ◽

1952 ◽

Vol 9 (6) ◽

pp. 493-502 ◽

Cited By ~ 15

Author(s):

William S. Port ◽

E. F. Jordan ◽

John E. Hansen ◽

Daniel Swern

Keyword(s):

Fatty Acids ◽

Vinyl Acetate ◽

Long Chain Fatty Acids ◽

Vinyl Esters ◽

Derivatives Of ◽

Long Chain ◽

Chain Fatty Acids

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Ratios for very-long-chain fatty acids in plasma of subjects with peroxisomal disorders, as determined by HPLC and validated by gas chromatography-mass spectrometry.

Clinical Chemistry ◽

10.1093/clinchem/34.6.1041 ◽

1988 ◽

Vol 34 (6) ◽

pp. 1041-1045 ◽

Cited By ~ 16

Author(s):

N A Hall ◽

G W Lynes ◽

N M Hjelm

Keyword(s):

Fatty Acids ◽

Zellweger Syndrome ◽

Hplc Method ◽

Gas Chromatography Mass Spectrometry ◽

Long Chain Fatty Acids ◽

Peroxisomal Disorders ◽

One Year ◽

Derivatives Of ◽

Long Chain ◽

Chain Fatty Acids

Abstract We describe an HPLC method for measurement of ratios of concentrations of very-long-chain fatty acids (VLCFA) in plasma. The method, which involves ultraviolet detection of p-bromophenacyl derivatives of fatty acids, is validated by comparison with a gas chromatographic-mass spectrometric (GC-MS) method. The correlation between the ratios of 24-carbon fatty acids to 22-carbon fatty acids (C24/C22) estimated by the two methods was close (r = 0.976) as was the correlation for the C26/C22 ratios (r = 0.947). Increased VLCFA ratios could be demonstrated by either technique in patients with adrenoleukodystrophy, Zellweger syndrome, and infantile Refsum's disease. The HPLC method also measures phytanate concentrations in plasma. Control VLCFA ratios (for subjects without peroxisomal disorders) obtained by the two methods agree well with those reported by Moser et al. (Ann Neurol 1984; 16:628-41). For subjects younger than one year, ratios for C24/C22 and C26/C22 fatty acids were significantly greater than in older subjects.

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