Comparison of visual and automated colorimeter for refined and bleached cottonseed oils

Wan, Peter J.; Pakarinen, D. R.

doi:10.1007/bf02636088

Cited by 9 publications

(8 citation statements)

References 2 publications

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“…Refined colors of these oils are given in Methods. Caustic refining of plant-produced crude oils was performed by a commercial laboratory according to AOCS Method Ca 9a-52 (8), and refined color was read according to AOCS Method Cc 13b-45 (8) or measured with a Colourscan (Tintometer Ltd., Salisbury, United Kingdom) automated colorimeter (9). Color of oil samples refined in our laboratory was determined by Colourscan in a 133.4-mm cell and reported as AOCS red scale.…”

Section: Methodsmentioning

confidence: 99%

Miscella refining test method for the determination of cottonseed oil color

Wan

Pakarinen

Hron

1996

J Americ Oil Chem Soc

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Most of the cottonseed oil mills in the United States have already converted to expander solvent extraction and miscella refining. This practice permits mills to produce and market a consistently light‐colored, prime bleachable summer yellow cottonseed oil at reduced cost and refining loss. A laboratory‐scale miscella refining test was developed to asses the oil quality in terms of its color. The test involves the addition of 3 parts oleic acid per 100 parts of crude oil in the miscella followed by refining with 2.5 parts NaOH when crude oil contains less than 4.5% free fatty acid (FFA). When crude oil contains FFA between 4.5 and 7.5%, no oleic acid is added prior to refining with 2.5 parts NaOH. When crude oil contains FFA higher than 7.5%, no oleic acid is added and the caustic addition table in American Oil Chemists' Society Method Ca 9a‐52 is followed. The test was conducted at room temperature and gave reproducible colors comparable to commercially refined oils.

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Section: Methodsmentioning

confidence: 99%

Miscella refining test method for the determination of cottonseed oil color

Wan

Pakarinen

Hron

1996

J Americ Oil Chem Soc

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“…Red readings measured by this method show good correlation with Lovibond red values, but a large yellow reading error exists between the two methods (8). In 1995 Wan and Pakarinen (9) demonstrated that the Colourscan can provide red color readings of refined and of refined, bleached cottonseed oils with good agreement vs. the values obtained by the visual Tintometer (r 2 = 0.99). A broad correlation between an improved version of the Colourscan PFX990 and the visual method was presented in an international collaborative study in the following years (10).…”

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confidence: 93%

Determination of oil color by image analysis

Sun¹,

Zhao²,

Zhou³

2001

J Americ Oil Chem Soc

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An image analysis method was developed to determine oil color based on Lovibond-red according to Chinese standard GB5528-85. For one hue, one feature of image analysis, a negative correlation with the red reading of the Lovibond tintometer (r > 0.995) was found. Mathematical models were designed to measure oil color based on image analysis. Fortynine oil samples including peanut oil, soybean oil, fragrant sesame oil, rapeseed oil and cottonseed oil were evaluated to assess the performance of the image analysis models. Good agreement, r 2 = 0.999, between image analysis values and visual color measurement by using the Lovibond Color Scale was obtained.Paper no. J9621 in JAOCS 78, 749-752 (July 2001).

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“…Colour in oil is used as the basis for its acceptance or rejection in the trade. 3 The colour of palm oil is a legitimate factor in determining its value, in as much as dark oils require expensive processing for conversion to an acceptable light-coloured product, and dark colour may also be an indication of poor quality in other respects. The colour of palm oil after reÐning and bleaching is a more satisfactory index of quality than is the colour of the crude palm oil (CPO) or the colour after reÐning alone.…”

Section: Introductionmentioning

confidence: 99%

Decolorisation of crude palm oil by acid-activated spent bleaching earth

Low

Lee

Kong

1998

J. Chem. Technol. Biotechnol.

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: Regeneration of spent bleaching earth by acid activation and heat treatment has been investigated. Spent bleaching earth was activated by H 2 SO 4 of various concentrations (1È40%) and heat treated at 120¡CÈ350¡C. The experimental results indicate that treatment of spent bleaching earth with 10% H 2 SO 4 at 350¡C produced a material which was most e †ective in removing coloured pigments from crude palm oil. Subsequent experiments were conducted using this particular acid-treated spent bleaching earth. Various parameters which a †ect the sorption process were studied. They include initial crude palm oil concentration, sorbent dosage and temperature. Applicability of both the Freundlich and Langmuir isotherms to the acid-treated spent bleaching earthÈpalm oil hexane miscella system indicates that both physiosorption and chemisorption were involved in the sorption process. Measurements of various quality parameters of bleached and crude palm oils were carried out. They include Lovibond Colour index, carotene content, peroxide value, free fatty acid, fatty acid composition and iodine value. The results show that the bleached palm oil retained good oil quality after the decolorisation process using 10% acid-treated spent bleaching earth with a Lovibond Colour of 6É4.1998 SCI (

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Comparison of visual and automated colorimeter for refined and bleached cottonseed oils

Cited by 9 publications

References 2 publications

Miscella refining test method for the determination of cottonseed oil color

Miscella refining test method for the determination of cottonseed oil color

Determination of oil color by image analysis

Decolorisation of crude palm oil by acid-activated spent bleaching earth

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