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Effect of phospholipids, free fatty acids and soapstock on colour fixation of cottonseed oil

✍ Scribed by Helmy, H. E. ;Taha, F. S. ;El-Motaal, E. A. Abd


Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
419 KB
Volume
38
Category
Article
ISSN
0027-769X

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✦ Synopsis


Effect of some substances present in cottonseed oil. e.g. phospholipids, free fatty acids and soapstock, on colour fixation of the oil was investigated. These components wcre added to cottonseed oil at different ratios and the oil exposed to a colour fixation treatment (heating at 60 "C for 15 days). Fixed oil samples were then refined and bleachcd. Spectrophotometric analysis (absorption spectra curves, oil colour, refinability, bleachability) and gossypol content were evaluated. Results revealed that the two samples of phospholipids (commercial from factory and laboratory prepared) added at 4% of crude cottonseed oil increased colour fixation. Free fatty acid added as oleic acid increased colour fixation a t 2.5% of oil over than 5% and lo%, whereas soapstock of two sources added at 10% of crude oil did not increase colour fixation.

Zusammenfassung

EinfluB von Phospholipiden, freien Fettsauren und Soapstock auf dic Farbstoffbindung von Baumwollsaatol Es wurde der EinfluB einiger in Baumwollsaatol enthaltener Substanzen (z. B. Phospholipide, freie Fettsiiuren, Soapstock) auf die Farbstoffbindung des Oles untersucht,. Die genannten Komponenten wurden Baumwollsaatol in unterschiedlichen Anteilen zugesetzt; das 0 1 wurde einer Behandlung zur Farbstoffbindung unterworfen (1 Stiigiges Erhitzen bei 60 "C). Danach wurden die Olproben raffiniert und gebleicht. Die spektrophotometrische Analyse (Absorptionskurven, Olfarbe, Raffinierbarkeit, Bleichbarkeit) und der Gossypolgehalt wurden bewertet. Die Ergebnisse zeigten, d a 8 dic beiden Phospholipidproben (handelsiibliches und Laborpriparat) bei Zusatz von 4?? zum rohen Baumwollsaatol die Farbbindung erhohten. Freie Fettsiiuren, zugesetzt in Form von Olsiure, erhohten bei Zusalz von 2,5% die Farbstoffbindung stiirker als bei Zusatz von 5 oder 10%. Zusatz von 10% Soapstock (zwei Herkiinfte) zum Ol trug nicht zur Erhohung der Farbstoffbindung bei.


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