Palm oil is the vegetable oil refined and modified in the largest amount. In this study, we present the effect of wet fractiona- tion and hydrogenation of RBD palm oil on the removal of 3-MCPD and glycidyl esters. Fractionated palmstearins had significantly decreased contents of 3-MCPD esters (71–74%) and glycidyl esters (21–26%), whereas top olein contained the highest levels of processing-induced contaminants accompanied by polar compounds. Exhaustive hydrogenation condi- tions caused rapid degradation of 3-MCPD esters (51–70%) in high melting palm oil products. Reduction of glycidyl esters (1–42%) was dependent on the type of nickel catalyst. The effect of iodine value drop on the contaminant degradation was shown to be linear. The combined action of dry-reduced, supported, 22% Ni and Raney nickel catalysts was found to be an optimal. Adsorptive bleaching and deodorization of hydrogenated palm stearin impacted particularly repeated formation of glycidyl esters up to 1.01–1.76 mg/kg, while 3-MCPD esters remained under the input RBD palm oil level. The mechanism of the catalyst action was investigated with glycidyl-d palmitate, 3-MCPD-d -1,2-dipalmitate. They were transformed into 5 5 non-carcinogenic and non-genotoxic products by hydrogenolysis and deoxygenation reactions. Keywords 3-Monochloropropane-1,2-diol (3-MCPD) ester · Glycidyl ester · Palm oil · Hydrogenation · Raney nickel · Wet fractionation
European Food Research and Technology – Springer Journals
Published: Jun 6, 2018
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