posted on 2021-05-21, 13:04authored byKarine Redeuil, Xanthippe Theurillat, Marine Nicolas, Kornél Nagy
The aim of this study was to identify
the chlorine source during
sunflower oil production and propose mitigation strategies in order
to prevent monochloropropane-diol ester (MCPDE) formation. Whole sunflower
seeds, the separated kernel, hulls, and pressed cake were studied
to pinpoint the location of chlorine donors originating from the crop.
Acid–water-based degumming, bleaching, cooling, and heat treatment
were performed to mimic the current refining process practices. Various
oil extraction and refining scenarios were tested. MCPDE and total
monochloropropane-diol (MCPD) content of the heat-treated samples
were determined by liquid chromatography-HRMS and by an AOCS Official
method. The results show that the oil produced from crop hulls and
the bleaching clay used are the strongest chlorine sources boosting
the MCPDE formation. Using a mixture of pressed and solvent extracted
cake oil as model, total 3-MCPD decreased by a factor of 2 when applying
static cooling in combination with a washed bleaching clay.