1937
DOI: 10.1042/bj0311605
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The isomerization of carotenes by chromatographic adsorption

Abstract: PREVIOUS investigations have shown that when pure f-carotene is adsorbed repeatedly on alumina it changes into a pigment having the same absorption spectrum as oa-carotene but differing in other properties. After isolation the new pigment was named pseudo-a-carotene [Gillam & El Ridi, 1935; 1936].

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Cited by 43 publications
(14 citation statements)
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“…The absorption spectrum in light petroleum does not, however, indicate the presence of a-carotene, and the conclusion is reached that evaporation to dryness before taking the pigment into carbon disulphide causes partial isomerization of the /?-carotene. The absorption spectrum of the first part of the fraction when in carbon disulphide is in good agreement with the /?-carotene isomer described as pseudo-a-carotene by Gillam & El Ridi (1936) which is probably identical with neo-/?-carotene B (Polgar & Zechmeister 1942).…”
Section: (A)supporting
confidence: 68%
“…The absorption spectrum in light petroleum does not, however, indicate the presence of a-carotene, and the conclusion is reached that evaporation to dryness before taking the pigment into carbon disulphide causes partial isomerization of the /?-carotene. The absorption spectrum of the first part of the fraction when in carbon disulphide is in good agreement with the /?-carotene isomer described as pseudo-a-carotene by Gillam & El Ridi (1936) which is probably identical with neo-/?-carotene B (Polgar & Zechmeister 1942).…”
Section: (A)supporting
confidence: 68%
“…The pigment most weakly adsorbed on alumina showing an absorption spectrum identical with that of a-carotene could be an isomer resembling pseudo-a-carotene (Gillam & El Ridi, 1936) or neo-/?-carotene B (Polgar & Zechmeister, 1942) derived from j8-carotene during preliminary treatment.…”
Section: Discussionmentioning
confidence: 99%
“…L'instabilitt': des carothoides, mise recemment en Cvidence, rend leur ktude extrkmement ddicate. Des carotinoides parfaitement homogilnes gardCs pendant quelque temps en solution, s'isomCrisent spontankment (Zechmeister & Tuszon, 1938;Gillam & El Ridi, 1936;Gillam et al 1937). Cette isomerisation est plus rapide ?…”
Section: Introductionunclassified