Spektralanalytischer Nachweis von Konjuen‐Fettsäuren

1. Twelve aliphatic alcohols of human sebum have been isolated and identified. They belong to three homologous series as follows: saturated normal alcohols (tetradecan-1-ol, hexadecan-1-ol, octadecan-1-ol, eicosan-1-ol, docosan-1-ol, tetracosan-1-ol), saturated i8o alchols (18-methylnonadecan-1-ol, 20-methylheneicosan-l-ol, 22-methyltricosan-l-ol) and unsaturated normal alcohols (eicos-10-en-1-ol, docos-12-en-1-ol, tetracos-14-en-1-ol). 2. The reversed-phase partition chromatographic technique for resolution of fatty acid mixtures (Howard & Martin, 1950) has been extended to include six shorter-chain acids having odd and even numbers of carbon atoms. The author wishes to thank Dr W. S. Rapson for suggesting this work and Dr D. A. Sutton for helpful discussions. Dr D. H. S. Horn helped the author considerably with advice and guidance on many occasions and this is very gratefully acknowledged. The microanalyses were by Mr F. W. G. Sch6ning and Miss J. M. Theron, infrared absorption spectra by Mrs M. A. Raal and X-ray measurements by Dr J. N. van Niekerk. This paper is published by permission of the South African Council for Scientific and Industrial Research.

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“…spectrophotometry using extinction coefficient of Martens (1952). (Using value of Kaufmann et al 1950, % licanic acid =51.3. )…”

Section: Linoleicmentioning

confidence: 99%

The estimation of unsaturated fatty acids by reversed-phase partition chromatography

Crombie

Comber

Boatman

1955

Biochemical Journal

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“…Wiley, Cagle, and Wilken (225) apply measurements of ultraviolet absorption of alkali-isomerized lespedeza oil to obtain the content of monoene, diene, and ttiene structures. A similar method is applied by Batishcheva et al (16) and by Kaufmann et al (113). The absorbance at 231 mg is used by Mead (l.{3) to follow concentration changes of linoleic acid during irradiation induced autoxidation.…”

Section: Biological and Pharmaceutical Applicationsmentioning

confidence: 99%

“…(113) describes a monochromator usable to 95 µ which is filled with hydrogen at a i v i d u a l n o t d i r e c t l y a s s o c i a t e d w i t h s c i t e i s p r o h i b i t e d . 1954 pressure of 2 mm., the pressure needed to operate the hydrogen arc source.…”

mentioning

confidence: 99%

Ultraviolet Absorption Spectrophotometry

Rosenbaum¹

1954

Anal. Chem.

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THISreview covers the 2-year period since the last one in this series (177) was written. The publication of ultraviolet absorption spectra has continued at a rapid rate. Most of these spectra are obtained for the purpose of studying correlations between structure and spectra, and they are not included in this review. GENERAL TOPICSA theoretical derivation of Beer's law is given by Strong (194,196) who extends the treatment to include the effect of the finite pass-band of the spectrophotometer. The derivation and validity of Lambert's and Beer's laws are discussed by Luck (131) with special attention to a spectrum which consists of overlapping lines. Some examples of apparent deviations from Beer's law• reported by Ungnade, Kerr, and Youse (309) are attributed by Yandenbelt, Henrich, and Bash (311) to low solvent transmittance since they were not observed with 0.02-cm. absorption cells.Rose (176) discusses deviations from Beer's law produced by scattering from suspended particles. A particularly helpful paper by Goldring et al. ( 81) treats the causes of departures from theory in spectrophotometry, principally the instrumental factors.Gridgeman (85) presents the theoretical background for the evaluation of the reliability of photoelectric photometry and includes a critique of the transmittance-ratio method developed by Ringbom.

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“…Paint J., 35,No. 46,32,34,36,38,40,No. 47, 62, 64, 66, 68, 70, 72 (1951). Vinyl resins and coating industry.…”

Section: Reviewsmentioning

confidence: 99%