Trials to improve the colour of colour fixed cottonseed oil using sodium oleate and sodium stearate in the absence and presence of azeotropic extract of cottonseed meal

Yousef, Elham A. A.

doi:10.3989/gya.1998.v49.i2.719

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Introduction1

21physical and Chemical Properties Of Cottonseed Oil1

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2011

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Cited by 2 publications

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References 9 publications

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“…It has also been shown that, over long periods of storage, gossypol and its degradation products can lead to a "color-fixed" oil which is characterized by a reddish brown color and is difficult to refine (6)(7)(8)(9)(10)(11). During the refining of cottonseed oil, pigments are removed at the stages of neutralization by sodium hydroxide and bleaching by adsorption on solids, usually activated clays.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Gossypol from Cottonseed Oil on Oxides

Kamga

Kayem²,

Rouxhet

2000

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Adsorption of Gossypol from Cottonseed Oil on Oxides

Kamga

Kayem²,

Rouxhet

2000

Journal of Colloid and Interface Science

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“…Color of refined and bleached cottonseed oil was measured by Lovibond Tintometer using 1 inch cell at 20 yellow , photometric index, refractive index, iodine value, saponification value, soap, unsaponifiable matter, anisidine value, peroxide value, acid value, and total gossypol content were determined according to AOCS official methods (1993). Absorption spectra of 4 % CCl 4 solutions of neutralized cottonseed oil (color fixed) and of the bleached oil was determined using Shimadzu spectrophotometer according to Yousef (1998)…”

Section: 21physical and Chemical Properties Of Cottonseed Oilmentioning

confidence: 99%

Bleaching of Color Fixed Cottonseed Oil

Hammad

Hallabo

Galal

2011

Egyptian Journal of Agricultural Sciences

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Six varieties of bleaching agents: Commercial, Engelhard and Tonsil bleaching earth, magnesium oxide, aluminum oxide and charcoal were selected to evaluate their abilities on reducing color and gossypol content of color fixed neutralized cottonseed oil. Color of this oil was higher than 50 red units / 20 yellow using Lovibond Tintometer and 1 inch cell and its gossypol content was 200 ppm . The bleaching of the color fixed cottonseed oil was carried out by using two methods, conventional method (stirring oil with bleaching earth), and passing the oil on column filled with bleaching adsorbents. The aluminum oxide showed a superior adsorption capacity in reducing color to less than 1.4 red/20 yellow and reducing the gossypol content to 21 ppm, by using the column system. The conventional method failed to reduce the color of the treated samples therefore, alkaline pretreatments were conducted. The treatment of color fixed oil with alkaline solution (sodium hydroxide solution 14.5 Be o or sodium silicate at 45 Be o ) followed by conventional Engelhard bleaching earth treatment reduced the color of oil to values lower than 1.4 Red/20Yellow.

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Trials to improve the colour of colour fixed cottonseed oil using sodium oleate and sodium stearate in the absence and presence of azeotropic extract of cottonseed meal

Cited by 2 publications

References 9 publications

Adsorption of Gossypol from Cottonseed Oil on Oxides

Adsorption of Gossypol from Cottonseed Oil on Oxides

Bleaching of Color Fixed Cottonseed Oil

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