caa a22 4500 465795722 CHVBK 20180323112037.0 cr unu---uuuuu 170327e19900601xx s 000 0 eng 10.1007/BF02539694 doi (NATIONALLICENCE)springer-10.1007/BF02539694 Helmy Hany Fats and Oils Department, National Research Centre, Cairo, Dokki, Egypt aut Studies on the pigments of some citrus, prune and cucurbit seed oils when processed with or without cottonseed oil [Elektronische Daten] [Hany Helmy] Pigments of citrus, prune and cucurbit fruit seed oils were studied spectrophotometrically. The citrus fruits used were: orange (O), mandarin (M), bitter orange (BO) and lemon (L). The prunes used were apricot (A), peach (P) and plum (PL); while melon (M), watermelon (WM) and Winter squash (S) were the cucurbits. Absorption spectra and Lovibond color were studied for crude, refined and bleached oils. Cottonseed oil (CSO) was mixed with some of the previous oils in the crude state, then refined and bleached. Absorption spectra of the crude fruit seed oils revealed carotenoid pigments at 400, 425, 455 and 480 nm, chlorophyll at 610 and 670 nm and unknown pigments at 525, 570 and 595 nm. Refining did not remove these pigments, whereas bleaching eliminated them completely. In oil mixtures of CSO+A, CSO+M and CSO+S, interference occurred between gossypol ‘360 nm' from CSO and the pigments of A, M and S seed oils. Refining the oil mixtures removed gossypol, but its effect on carotenoids, chlorophyll and unknown pigments was limited. Bleaching completely removed all these residual pigments. Lovibond color for all bleached oils was very low (0.2-2 yellow). The refined oils, except those containing Winter squash seed oil, were found to have an acceptable color (0.8-15 yellow). Results of the proposed process reveals the possibility of mixing crude edible oil with crude fruit seed oils, then processing the oil mixture by the conventional methods of refining and bleaching. AOCS Press, 1990 Journal of the American Oil Chemists' Society Springer-Verlag 67/6(1990-06-01), 376-380 0003-021X 67:6<376 1990 67 11746 https://doi.org/10.1007/BF02539694 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02539694 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Helmy Hany Fats and Oils Department, National Research Centre, Cairo, Dokki, Egypt aut NATIONALLICENCE 773 0- Journal of the American Oil Chemists' Society Springer-Verlag 67/6(1990-06-01), 376-380 0003-021X 67:6<376 1990 67 11746 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer