The influence of processing on the spectral properties of vegetable oils

O’Connor, Robert T.; Field, Elsie T.; Jefferson, Michael; Dollear, F. G.

doi:10.1007/bf02903179

Cited by 25 publications

(8 citation statements)

References 19 publications

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“…Most of the absorbing compounds were of low MW and probably were carotenoids. Similar spectra have been noted with other carotenoid-containing oils (25,26). High MW light-absorbing compounds also were present, but the H fraction spectrum contained no absorbance bands attributable to carotenoid esters or other well characterized pigments.…”

Section: Visible Spectra Of Gpc Fractionssupporting

confidence: 74%

“…The spectra show the absence of absorbance bands attributable to carotenoids (X max 456 nm for fJ-carotene), chlorophylls (X max 410-440 and 670 nm [not shown]), or other known pigments. Spectra published for other deodorized vegetable oils are similar (26). Most of the components absorbing from 350-450 nm were present in the high MW (H) fraction but significant amounts were also present in the low MW (L) fraction.…”

Section: Visible Spectra Of Gpc Fractionsmentioning

confidence: 62%

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Colored components of processed palm oil

Fraser¹,

Frankl²

1981

J Americ Oil Chem Soc

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The compounds responsible for the colors of palm oils at various stages of processing have been isolated by gel permeation chromatography. The isolated colored compounds have been characterized by visible spectroscopy and, in some cases, further fractionated by high performance liquid chromatography. All palm oils studied contained colored compounds of both higher and lower molecular weight than trigtycerides. Oils at different stages of processing contained different proportions of these high and low molecular weight, colored compounds. While the color of crude palm oils was primarily due to the low molecular weight carotenoids, the color of finished oils was due to compounds other than carotenoids. High molecular weight compounds were significant, sometimes predominant, contributors to finished oil colors. These results demonstrate the importance of high molecular weight, colored compounds to the color of finished palm oils. Further, these results suggest that the difficulties associated with decolorization of certain crude palm oils may be due either to the presence of high molecular weight, colored compounds or to the presence of precursors capable of generating these compounds during the decolorization process. ABSTRACTTwenty-four oxygenated cholesterols and structurally related compounds were analyzed by high performance liquid chromatography with silicic acid column and various mobile phases. Hexane/2-propanol was superior to hexane/tetrahydrofuran and hexane/ethyl acetate for the separation of oxygenated cholesterols. The retention volumes of oxygenated cholesterols depended on the characteristics of the substituting group, its position of substitution, as well as its orientation. The effect of various functional groups at different positions on cholesterol molecules, in general order of decreasing retention volumes, were: hydroxy on the ring, carbonyl on the ring, epoxy on the ring, hydroxy on the side chain, and carbonyl on the side chain. Synergistic effect of multiple hydroxyl substitutions on cholesterol was observed.

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Section: Visible Spectra Of Gpc Fractionssupporting

confidence: 74%

Section: Visible Spectra Of Gpc Fractionsmentioning

confidence: 62%

Colored components of processed palm oil

Fraser¹,

Frankl²

1981

J Americ Oil Chem Soc

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“…The unidentified pigments appeared at 525,570 and 590 nm. They may belong to flavonoids (O'Connor, 1949).…”

Section: Resultsmentioning

confidence: 99%

Studies on carotenoids and oxidative stability of winter squash seed and soybean oils

Helmy¹

1992

Grasas y Aceites

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“…(AUED-PIMENTEL; ALMEIDA-GONÇALVES; MANCINI-FILHO, 1993;MITCHEL;KRAYBILL, 1942;O'CONNOR et al, 1949). The presence of these compounds in vegetable oils can be detected by increased ultraviolet absorption at 270 nm (APARICIO, 2003; AUED-PIMENTEL; ALMEIDA-GONÇALVES; MANCINI-FILHO, 1993).…”

Section: Determination Of Stigmastadienementioning

confidence: 99%