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Cottonseed Colour Fixed Pigments. Part I. Selectivity of Hexane Isomers

✍ Scribed by El-Nockrashy, A. S. ;Zaher, Ferial A. ;Osman, F.

Publisher
John Wiley and Sons
Year
1976
Tongue
English
Weight
467 KB
Volume
20
Category
Article
ISSN
0027-769X

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✦ Synopsis

Abstract

The selectivity of hexane isomers towards cottonseed pigments and colour fixed pigments was illustrated by using spectrophotometric analysis of crude, refined and bleached oils, and by refinability and bleachability criteria. Crude cottonseed oil contains besides the alkali‐refinable gossypol and gossypurpurin, several colour fixed pigments. Anhydrogossypol, gossyfulvin, anthocyanins and carotenoids seem to be responsible for the colour‐fixation of the oil. Only carotenoids are eliminated by bleaching. Selectivities of hexane isomers towards colour fixed pigments are in the following order: isohexane < n‐hexane < cyclohexane < benzene < methylcyclopentane.

📜 SIMILAR VOLUMES

Cottonseed colour fixed pigments. Part I
Cottonseed colour fixed pigments. Part II. Role of hexane isomers on oil quality
✍ Osman, F. ;Zaher, F. A. ;El-Nockrashy, A. S. 📂 Article 📅 1976 🏛 John Wiley and Sons 🌐 English ⚖ 488 KB

## Abstract Colour fixed pigments can be detected in refined and bleached oils rather than in crude oils, since in the latter their absorption is masked up by the gossypol pigments. Isohexane is the most desirable hexane isomer. Though it produces darker crude oils, yet refinability and bleachabil

Cottonseed colour fixed pigments. Part I
Cottonseed colour fixed pigments. Part III. Prevention of colour fixation and removal of colour-fixed pigments
✍ Attia, M. ;Abbasy, M. ;El-Nockrashy, A. S. ;Shoeb, Z. E. 📂 Article 📅 1981 🏛 John Wiley and Sons 🌐 English ⚖ 394 KB

## Abstract Gossypol‐oil solution and colour‐fixed oil prepared therefrom are treated with ethanolamine, p‐aminobenzoic acid, urea, and acetic acid. The efficiency of the four additives in removal of gossypol and colour fixed pigments is examined. Ethanolamine and p‐aminobenzoic acid at 0.5 and 1.0