Analyse von Wachsen und Wachsmischungen mit Hilfe der Dünnschicht‐Chromatographie

Reutner, Kfm. F.

doi:10.1002/lipi.19680700305

Cited by 6 publications

(1 citation statement)

References 21 publications

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“…Hoffman (44) determined barium metaborate volumetrically in paint after extraction, applying the method to alkyd and oil-based paints as well as latex films. Reutner (88) applied thin-layer chromatography to the analysis of waxes and wax mixtures, obtaining characteristic chromatograms for different products. Meddle and Wood (74) procedure for determining toluene diisocyanate in air without interference from aromatic amines by drawing the air through two different solutions, developing color complexes, and basing the calculation on the different optical densities.…”

Section: Oils and Fatty Acidsmentioning

confidence: 99%

Coatings

Swann¹,

Adams²,

Esposito³

1971

Anal. Chem.

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Section: Oils and Fatty Acidsmentioning

confidence: 99%

Coatings

Swann¹,

Adams²,

Esposito³

1971

Anal. Chem.

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Dünnschicht‐Chromatographie von Kohlenwasserstoff‐Wachsen an harnstoffbeschichteten Platten

Dietsche

1970

Fette, Seifen, Anstrichm.

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esters derived from two different homologous series, namely the cerotates and stearates of homologous higher alcohols (see also Fig. 1). The esters of cerotic acid which bear the ester group almost in the center of their carbon chain exhibit always lower retention volumes than esters of stearic acid of the same molecular weight. This is because in the former esters the ester group is always shifted by 8 carbon atoms towards the end of the chain. A n analogous decrease in retention volumes was found to occur when a simple double bond or a methyl or cyclohexyl group as substituents are shifted toward the center of the aliphatic chaing.These relationships together with attempts aimed at the determination of isomeric esters contained in individual peaks by means of mass spectrometry will be studied further in our future work. Since the fragmentation in the mass spectrum of higher individual esters permits localization of the ester group lo, it appears worthwhiIe to exploit the combination of GLC with mass spectrometry also for quantitative analyses ". occuring esters rarely contain single compounds. They are mostly a mixture of isomeric esters differing in the position of the ester group. These isomers can not be resolved as yet by GLC on packed columns. cso 15 30 45 min Fig. 2. Gas liquid chromatogram of mixture of simple esters isolated recently from Bohemian montana wax 5. Conditions used as in Fig. 1 It was assumed that the shift of the ester group from the end of the aliphatic chain towards its center would result in a stepwise decrease in elution values of the isomeric esters, parallel to a decrease in their boiling points. W e have examined this point in preliminary experiments by comparing the retention volumes of M . Streibl a n d K . Strdnsk4. Fette . Seifen . Anstrichmittel < . 70, 543 [1968]. lo R. Ryhnge and E. Stenhagen, Arkiv Kemi 14, 483 [1959].'' GLC-analysis was used independently from our experiments in the following papers: P. /. HolZoway, J. Pharmacy

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Fortschritte auf dem Gebiet der Lipoid‐Analyse VI: Dünnschicht‐Chromatographie, Teil 3

1970

Fette, Seifen, Anstrichm.

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sind nach deni X. Abril3 keine Kristalle i n e h r vorzufinden. Diese evidenten Unterschiede in bezug auf die Eindringtiefe beider V e r b i n d u n g e n sprechen g e g e n eine blofle I~ollikell'iillung init kristallinen Substanzen. Alle P a rtikel des Wirkstoffes I'soil mussen e n t w e d e r bereits i m C'orfcld tler I h r r i e r e in Liisung g e g a n g e n sein o d e r d i e Kristal Iform bzw. a n d e r e u n b e k a n n t e Effekte v e r h i n d e r n dessen I'indringen.Ahnlich f a l l t d i e Beurteilung bei einem Vergleich zwischen d e n lcindringtiefen von Anaesthesin u n d N a t r i u mcurbonat bzw. S o d a aus. D i e Meiiwerte beider Verbintlungcn weisen ebenfalls d e n gleichen S t a r t p u n k t in l)czug a u l d i e 10 Min. l a n g e Einmassage auf. D i e Anaesthesinkristalle scheinen gleich d e m Psoil bereits im Vorfeld d e r Barriere vollig gelost zu sein, wohingegen bei N a t r i u m c a r b o n a t dies beim 40. Tesafilm-Abrii3 noch nicht d e r Fall ist. A u f f a l l e n d ist beim Anaesthesin, wie a u s dessen K u r v e n b i l d e r n ersichtlich w i r d , dafl sich bei blolkr E i n w i r k u n g init A u s n a h m e des Startpunktes hiihere MelSwerte d e r clurchschnittlichen K a n t e n l a n g e n tler Kristallpartikel ergeben haben. Die Loslichkeit d e r Anaesthesinkristalle scheint offenbar durch den Effekt der Eininassage beeinfluflbar z u sein. Die K u r v e n des K F 224 m i t der grol3en Steilheit imAnfangsteil spiegeln dessen uneinheitliche Kristallgriiflenverteilung wieder.Bei den Versuchen m i t T o l n a f t a t -, Na,COa. 10 H,Ou n d K F 224-Salbe w u r d e n auf G r u n d der betrachtlichen Eindringtiefe d e r Kristallpartikel Blindversuche durchgefiihrt, i n d e m d i e U n t e r a r m h a u t der Testpersonen o h n e Salbe der Stripping-Technik unterworfen u n d d i e Tesafilm-Abrisse anschliefiend i m Polarisationsinikroskop angesehen w u r d e n . D a r a u s ergab sich, da13 oberhalb e i n e r I'artikelgriifle von 14 p m Kristalle von H o r nschichtlainellen eindeutig unterschieden w e r d e n konnten. Fur die Autoren: Oberassistent Dipl.-Chem. Dr. H . Sc/r(i('/cr, Universitats-Hautklinik im Rudolf-Virchow-Krankenhaus, 1 Berlin 6 5 .

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Analyse von Wachsen und Wachsmischungen mit Hilfe der Dünnschicht‐Chromatographie

Cited by 6 publications

References 21 publications

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Dünnschicht‐Chromatographie von Kohlenwasserstoff‐Wachsen an harnstoffbeschichteten Platten

Fortschritte auf dem Gebiet der Lipoid‐Analyse VI: Dünnschicht‐Chromatographie, Teil 3

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