Auffindung und Charakterisierung eines neuen Typus von Umwandlungen an Alkalisalzen höherer Fettsäuren

Thießen, P. A.; Ehrlich, Eva

doi:10.1515/zpch-1933-16540

Cited by 22 publications

(8 citation statements)

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“…Dilatometric data for figure 2 Weight of sodium stearate, 0.1582 g.; dilatometer calibration, 1 mm. is 2.24 X These observations are in accord with Thiessen's (12) earlier conclusion that the transition from alpha to beta is monotropic and with the x-ray work of Me-Bain and coworkers (3), who found that after alpha had been heated above 54°C. only beta was present in the cooled sample.…”

Section: Tablesupporting

confidence: 88%

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The Polymorphism and Transitions of Anhydrous and Hydrous Sodium Stearate

Vold¹

1945

J. Phys. Chem.

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Section: Tablesupporting

confidence: 88%

“…Sample II is probably the closest to pure sodium stearate of the :us present preparations. Sample ÍY, though from the smir arid, conlains some free stearic acid for the same reason given above, and also a t race oi urea, which Thiessen (12) found useful in promoting the growl ii of alpha crystals.…”

Section: Experimental Methods and Materialsmentioning

confidence: 77%

The Polymorphism and Transitions of Anhydrous and Hydrous Sodium Stearate

Vold¹

1945

J. Phys. Chem.

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“…With this phospholipid marked line narrowing occurs near 70°C. In soaps, transitions have been observed at the melting point of the corresponding fatty acids and are termed genotypical points 19 but, although the melting point of oleic acid is 13"@, no pronounced line narrowing is observed near this temperature. The spin lattice relaxation times above the first main endothermic transition are of similar magnitude as those of the dimyristoyl derivative.…”

Section: -0 Leo Y L -3 -S Te Aro Y L -D L -P I30 S P H a Tidy Le Th A...mentioning

confidence: 99%

Physical studies of phospholipids. Part 5.—Proton magnetic resonance studies of molecular motion in some 2,3-diacyl-DL-phosphatidylethanolamines

Chapman¹,

Salsbury²

1966

Trans. Faraday Soc.

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Proton magnetic resonance spectra of anhydrous polycrystalline 2,3-dimyristoyl-and 2-oleoyl-3-stearoyl-~~-phosphatidylethanolamine have been obtained at temperatures between -196 and 160°C. The line widths and second moments decrease gradually with increasing temperature up to a transition point which is different for the two phospholipids and at which abrupt reductions occur. The variation of line width and second moment up to the transition temperature is analyzed in terms of rotatory and oscillatory reorientations of the hydrocarbon chains. A crystallinecrystalline phase transition is observed below the first transition temperature. At the first transition temperature, a crystalline mesomorphic transition takes place and, at higher temperatures, a mesomorphic-niesomorphic transition occurs. Considerable molecular motion of the hydrocarbon chains is occurring in the mesomorphic phases. The n.m.r. spectra of other anhydrous phosphatidylethanolamines of different chain lengths and degrees of unsaturation, as well as a phospholipid extract from brain, have been obtained at 23°C.

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“…were slightly different and referred this to the very slight dilatometrio inflection at 65°C. pointed out by Void and Void (reference 11, page 813) which they thought "might be ascribed to the genotypic transformation" of Thiessen and Ehrlich (8). However, the genotypic transformation is not a transformation of the first order, whereas the curd ^supercurd is a true transition.…”

Section: Results For Sodium Lauratementioning

confidence: 99%