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                        亚麻酸 Linolenic acid

                        上海浩然生物技术有限公司2010年5月7日 9:34 点击:2356

                        Linolenic acid
                        Product Number L 2376
                        Storage Temperature -0 ?C
                        Replacement for Product Code 85''601-0
                        Product Description
                        Molecular Formula: C18H30O2
                        Molecular Weight: 278.4
                        CAS Number: 463-40-1
                        Melting Point: -10.6 ?C1
                        Boiling Point: 230-232 ?C (1 mm Hg)
                        Synonym: ?-linolenic acid.
                        Linolenic acid is a component of some plant seed oils.2
                        Plant derived oils such as linseed oil are a source for
                        its isolation.3 Linolenic acid is an essential fatty acid.3
                        Polyunsaturated fatty acids (such as linolenic acid)
                        autooxidize by three competing pathways.6 After
                        formation of a peroxy radical'' the following can occur:
                        1) abstraction of hydrogen atoms to give
                        hydroperoxide products''
                        2) beta-scission of the carbon-oxygen bond to give
                        back carbon radicals'' including isomerized carbon
                        radicals''
                        3) cyclizing to give a cyclic peroxy radical.
                        A procedure for determination of the amount of
                        oxidation in a lipid by way of the oxidation index has
                        been published.4 The oxidation index is a ratio of the
                        absorbance at 233 nm to the absorbance at 215 nm.
                        The latter wavelength was chosen since there is little
                        contribution of the fatty acid carbonyl to the
                        absorbance at this wavelength'' thus allowing Beers
                        Law to be followed.
                        Lipid oxidation'' mechanisms'' products and biological
                        significance for fatty acids'' including linolenic acid and
                        oleic acid has been discussed.5''7
                        Precautions and Disclaimer
                        For Laboratory Use Only. Not for drug'' household or
                        other uses.
                        Preparation Instructions
                        Linolenic acid is not soluble in water. It is soluble in
                        ethanol'' ether'' and chloroform.8
                        References
                        1. Holman'' R. T.'' and Elmer'' O. C.'' The Rates Of
                        Oxidation Of Unsaturated Fatty Acids And Esters.
                        J. Am. Oil Chem. Soc.'' 24'' 127-129 (1947).
                        2. Oil Crops of the World'' Robbelen'' G.'' et al.'' eds.''
                        McGraw-Hill (New York'' NY: 1989)'' pp. 66-67.
                        3. The Merck Index'' 12th ed.'' Entry# 5530.
                        4. Klein'' R. A.'' The Detection Of Oxidation In
                        Liposome Preparations. Biochim. Biophys. Acta.''
                        210(3)'' 486-489 (1970).
                        5. Frankel'' E. N.'' Lipid Oxidation: Mechanisms''
                        Products and Biological Significance. J. Am. Oil
                        Chem. Soc.'' 61(12)'' 1908-1916 (1984).
                        6. Fox'' J.'' Fatty Acids' Spontaneous Oxidation
                        Clarified. Chemical and Engineering News'' Oct.
                        26'' 18-19 (1981).
                        7. Kim'' R. S.'' and LaBella'' F. S.'' Comparison Of
                        Analytical Methods For Monitoring Autooxidation
                        Profiles Of Authentic Lipids. J. Lipid Res.'' 28(9)''
                        1110-1117 (1987).
                        8. Data for Biochemical Research'' 3rd ed.'' Dawson''
                        R. M. C.'' et al.'' Oxford University Press (New
                        York'' NY: 1986)'' pp. 176-177.
                        RLG/RXR 6/03
                         

                        (来源: 上海浩然生物技术有限公司


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