Studies in vitamin A. 12. Whale-liver oil analysis: preparation of kitol esters

Barua, R. K.; Morton, R. A.

doi:10.1042/bj0450308

Cited by 19 publications

(3 citation statements)

References 6 publications

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“…The suggestion that a dimeric derivative of retinol may be produced when one OHion is consumed/molecule of retinol is in keeping with the fact that material absorbing at about 295mm,u is formed when the products of the reaction of retinol with TCNQ in ethanol are added to water. The absorption band of this material is in a similar position to that of kitol, a dimer of vitamin A with an absorption maximum at 290mu and therefore possessing a chain, or two chains, of only four conjugated double bonds (Barua & Morton, 1949). Additionally, the finding of Mousseron-Canet, Mani, Favie & Lerner (1966), that a high yield of dimer is produced on irradiation at 325m,u of vitamin A in hexane, is also consistent (Grady & Borg, 1968).…”

Section: Discussionmentioning

confidence: 78%

Reaction of vitamin A with acceptors of electrons. Formation of radical anions from 7,7,8,8-tetracyanoquinodimethane and tetrachloro-1,4-benzoquinone

Lichti

Lucy

1969

Biochemical Journal

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1. The interactions of retinol and retinoic acid with two electron acceptors, 7,7,8,8-tetracyanoquinodimethane (TCNQ) and tetrachloro-1,4-benzoquinone (chloranil), were studied in an investigation on the ability of vitamin A to behave as a donor of electrons. 2. Retinol reacts with TCNQ in polar organic solvents with the formation, as judged by spectral studies, of the radical anion of TCNQ. 3. Addition of the products of this reaction to water is accompanied by a rapid consumption of OH(-) ions. 4. Consumption of OH(-) ions is also a feature of the reactions between retinol and chloranil, but the spectrum of the radical anion of chloranil is observed only when retinol and chloranil are suspended in aqueous salt solutions. 5. Retinoic acid behaves similarly to retinol in its reactions with TCNQ and chloranil, but it appears to be a weaker electron donor than retinol. 6. The reaction products that may be formed from retinol in its reactions with TCNQ and chloranil are discussed. 7. It is suggested that the ability of vitamin A to behave as a donor of electrons may be an important aspect of its biochemical mode of action.

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Section: Discussionmentioning

confidence: 78%

Reaction of vitamin A with acceptors of electrons. Formation of radical anions from 7,7,8,8-tetracyanoquinodimethane and tetrachloro-1,4-benzoquinone

Lichti

Lucy

1969

Biochemical Journal

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“…The adsorbent was activated alumina (P. Spence and Co., Grade 0) weakened with 8 % water. The technique used has been described by Barua & Morton (1949).…”

Section: Biochem 1951 50mentioning

confidence: 99%

Studies in vitamin A. 16. Spectroscopic properties of all-trans-vitamin A and vitamin A acetate. Analysis of liver oils

Cama

Collins

Morton

1951

Biochemical Journal

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“…40-60°) (Amax 350 m,u, in light petroleum or ethanol). The light-petroleum solution of the product was chromatographed on a column packed with weakened alumina [8 % (v/w) of water (Barua & Morton, 1949)], when two zones were seen: a slowly moving yellow zone and another yellow zone (containing vitamin A acid) that was adsorbed very strongly near the top of the column. This zone could not be made to flow down even with 20 % (v/v) ether in light petroleum (b.p.…”

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confidence: 99%