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Winkler‐Moser, Jill K.; Ashby, Richard D.; Yosief, Hailemichael O.; Msanne, Joseph; Peterson, Steven C.; Bantchev, Grigor B.; Cermak, Steven C.; Felker, Frederick C.
Journal of the American Oil Chemists' Society, 04/2024Journal Article
Abstract Sophorolipids (SL) are glycolipids composed of a sophorose head‐group linked to a hydroxy‐fatty acid tail which makes them a potential source of structurally unique biobased hydroxy fatty acids. Furthermore, Lesquerella is a native southwestern plant that has been commercially cultivated as a replacement for castor seed oil due to high seed oil concentrations of 14‐hydroxy‐eicosenoic acid (14‐OH‐C20:1 c 11). In this study, SL‐derived hydroxy fatty acids and methyl esters containing 15‐hydroxy‐palmitic acid (15‐OH‐C16), 17‐hydroxy‐stearic acid (17‐OH‐C18), 15‐hydroxy‐palmitic acid methyl ester (15‐OH‐C16ME), 17‐hydroxy‐stearic acid methyl ester (17‐OH‐C18ME), and 13‐hydroxy‐behenic acid methyl ester (13OH‐C22ME) were obtained from the SL produced by two yeast strains. In addition, hydrogenated Lesquerella oil (HLO) was made with ~62% 14‐OH‐eicosanoic (C20) acid (14‐OH‐C20). These materials, along with 12‐hydroxy‐stearic acid (12‐OH‐C18) as a standard for comparison were used to make soybean oil oleogels, and their properties determined. The minimum gelation concentration (MGC) of 12‐OH‐C18 was 1% (wt/wt), while the MGC of 15‐OH‐C16 and 17‐OH‐C18 were 5% and 10%, respectively. The MGC for 15‐OH‐C16ME was 5%, but 17‐OH‐C18ME was unable to form a stable gel at concentrations up to 10%. HLO formed a viscous solution rather than an oleogel, but its crystal morphology underwent a large transformation during storage over a 2.5‐month period, after which it was able to form a stable gel. SL‐based hydroxy fatty acids were able to form oleogels in soybean oil and have the potential to be considered as a new source of low‐molecular weight oleogelators as well as biobased hydroxy fatty acids.
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