1964 – 65

Wolff, Kurt H.

doi:10.1007/978-94-010-1526-4_30

Cited by 2 publications

(6 citation statements)

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“…This is due to an insufficient difference in the ECLof these two groups of isomers--ca. 18.30 for the trans-6 to trans-8 ] 8:1 acids (as isopropyl esters), and 18.50 for the trans-13 and trans-14 18:1 acids (Fig. 3).…”

Section: Resultsmentioning

confidence: 96%

“…Individual standards of trans-18:1 acids are not commercially available. A simple and convenient mean to test the resolutive power of a column is to use trans-18:1 acids from butterfat or beef taIIow (actually from any ruminant fat) because their distribution profile is almost constant (17,18,22). The trans-11 18:1 acid (vaccenic acid), the major isomer in these fats, may be used as a landmark to identify other isomers.…”

Section: Resultsmentioning

confidence: 99%

“…Samples and standards. Ruminant fats and their fatty acid derivatives (isopropyl and methyl esters) were prepared as described previously (17,18). The trans-18:1 acid fraction from butterfat used in the present study was a mixture of the trans-18:1 acid fractions isolated by Ag-TLC from 14 different samples of butter purchased in July and August 1994.…”

Section: Methodsmentioning

confidence: 99%

“…The trans-18:1 acid fraction from beef tallow was a composite sample made with the trans-18:1 acid fractions isolated by Ag-TLC from nine samples of beef tallow obtained monthly between March and November 1994 and prepared with the fat of cattle slaughtered in an abattoir near Paris. The trans-18:1 acid fraction from human milk lipids corresponds to the pooled trans-18:1 acid fractions isolated by Ag-TLC from lipids of ten samples of human milk (18). Neutralized, bleached soybean oil was partially hydrogenated at 185°C for 16 rain under a hydrogen pressure of 200 kPa in the presence of 0.1% nickel catalyst.…”

Section: Methodsmentioning

confidence: 99%

“…In recent studies on the trans-18:1 acid content and distribution in ruminant fats and human milk lipids (17,18), we could obtain a rather good resolution of several, but not all, isomers using a 50-m CP-Sil 88 capillary column (Chrompack, Middelburg, The Netherlands). Several overlaps occurred, and often only groups of isomers could be quantitated.…”

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confidence: 99%

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Improvement in the resolution of individualtrans‐18:1 isomers by capillary gas‐liquid chromatography: Use of a 100‐m CP‐Sil 88 column

Wolff

Bayard

1995

J Americ Oil Chem Soc

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Doubling the length of a CP-Sil 88 capillary column (Chrompack, Middelburg, The Netherlands) from 50 to 100 m remarkably improves the resolution of individual trans-18:1 isomers from either ruminant fats or partially hydrogenated oils. Although the use of a 50-m column gives interesting results, it does not allow sufficient resolution of the trans-10 and trans-11 18:1 isomers. Moreover, the trans-6 to trans-9 18:1 isomers emerge as a single group of peaks, whereas the trans-12 isomer is only partly resolved from the adjacent trans-11 and trans-13 plus trans-14 isomers. With the 100-m column, the trans-9, trans-lO, and trans-12 18:1 isomers are almost baseline resolved from other isomers. However, with both columns, it is not possible to separate the critical pair of trans-13 and trans-14 18:1 acids which co-elute under a single peak. Despite this minor drawback, the 100-m CP-Sil 88 column appears to be of great interest for the separation and the quantitation of most individual trans-18:1 acids. Except for the use of argentation thin-layer chromatography, there is no need for complementary techniques, such as ozonolysis. This simple and powerful tool may be applied to ruminant fats, partially hydrogenated oils, and human tissue lipids. JAOCS 72, 1197-1201 (1 995).

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Improvement in the resolution of individualtrans‐18:1 isomers by capillary gas‐liquid chromatography: Use of a 100‐m CP‐Sil 88 column

Wolff

Bayard

1995

J Americ Oil Chem Soc

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Heterochrony in Haplomesus (Crustacea: Isopoda: Ischnomesidae): revision of two species and description of two new species

G.D.F

2006

Zootaxa

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Two new species of Ischnomesidae, Haplomesus celticensis sp. nov. and Haplomesus hanseni sp. nov. are described from the southwest of Ireland and the Argentine Basin respectively. Both species lack the expression of pereopod VII, a characteristic that we argue is produced by progenesis, not neoteny as suggested by Brökeland & Brandt (2004). Haplomesus angustus Hansen, 1916 and Haplomesus tropicalis Menzies, 1962, also lack pereopod VII and are revised from the type material. The original description of Haplomesus angustus Hansen, 1916 describes the adult type specimen as a juvenile; the original description of Haplomesus tropicalis Menzies, 1962 fails to mention the lack of pereopod VII. Progenesis is discussed for the above species and within the family Ischnomesidae as a whole.

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1964 – 65

Cited by 2 publications

References 0 publications

Improvement in the resolution of individualtrans‐18:1 isomers by capillary gas‐liquid chromatography: Use of a 100‐m CP‐Sil 88 column

Improvement in the resolution of individualtrans‐18:1 isomers by capillary gas‐liquid chromatography: Use of a 100‐m CP‐Sil 88 column

Heterochrony in Haplomesus (Crustacea: Isopoda: Ischnomesidae): revision of two species and description of two new species

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