The Spectrophotometric Analysis of Fats

Beadle, B. W.; Kraybill, H. R.

doi:10.1021/ja01235a507

Cited by 46 publications

(6 citation statements)

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“…Pure non-conjugated linoleate is essentially transparent in the near ultraviolet while conjugated linoleate absorbs strongly at 230-233 m~. Alkali conjugation of normal cis-9, cis-12 linoleate has been made the basis of analytical methods (1,2,9).…”

Section: Ultraviolet Absorption Of Linoleate Isomersmentioning

confidence: 99%

Isomers of linoleic acid. Infrared and ultraviolet properties of methyl esters

Jackson

Paschke

Tolberg

et al. 1952

J Americ Oil Chem Soc

139

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Section: Ultraviolet Absorption Of Linoleate Isomersmentioning

confidence: 99%

Isomers of linoleic acid. Infrared and ultraviolet properties of methyl esters

Jackson

Paschke

Tolberg

et al. 1952

J Americ Oil Chem Soc

139

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“…A recent research program at this laboratory required the accurate analysis of animal fats and their soaps, including some partially hydrogenated products, for polyunsaturated constituents. Difficulties were encountered in attempting to apply the speetrophotometric method of Mitchell, Kraybill, and Zscheile (9) and its extension by Beadle and Kraybill (2), to these materials. These difficulties have been largely overcome in a modified method proposed by Briee and Swain (5).…”

mentioning

confidence: 99%

Spectrophotometric determination of small proportions of polyunsaturated constituents in fatty materials

et al. 1945

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Summary Existing ultraviolet spectrophotometric methods have been modified for application primarily to the detection and estimation of low proportions of conjugated and nonconjugated unsaturated constituents in fats, oils, and soaps. The method is applicable also to fatty materials having high proportions of these constituents. Modifications include corrections for absorption by interfering substances, use of alkaline glycerol as an isomerization medium in the analytical procedure, and correction of absorption data on the isomerized product for absorption by conjugated constituents in the material before isomerization. The presence of small proportions of highly unsaturated conjugated and nonconjugated compounds is established in lards, tallows, tallow soaps, and highly purified esters and acids. Tall oil fatty acids are shown to contain approximately 10% of conjugated diene acids and a small amount of linolenic acid.

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“…Table 6 summarizes the specific extinction coefficients. From the above data, using the results for arachidonic acid given by Beadle & Kraybill (1944), the amQunt of arachidonic acid in fraction B44 can be calculated to be 24 %, as compared with 17 % from the weight of ether-insoluble polybromides. * On the basis of the whole fat, these values represent 0-07 and 0-05 % respectively, as compared with the value of 0-4 % recorded by Brown & Deck (1930) for commercial lard.…”

Section: I945mentioning

confidence: 99%