Distilled glycerides are obtained through distillation of the system mono-diglycerides which is produced from the esterification reaction between a triglyceride with glycerol. In this work, monoglycerides (MG) and diglycerides (DG) are produced through lipase-catalyzed glycerolysis of soybean oil using Candida antarctica B in a solvent-free system. To separate the products of the reaction in order to obtain essentially MG and an oil of DG, it is necessary to use a suitable process in order to preserve the stability of the components and to keep the products free of inappropriate solvents. So, after 24 h of enzymatic reaction, the mixture of acylglycerols and fatty acids was distilled into a centrifugal molecular distiller, since it provides a free solvent and lower temperature environment to increase the desired product concentration. Starting from a material with 25.06% of triglycerides (TG), 46.63% of DG, 21.72% of MG, 5.38% of free fatty acids (FFA), and 1.21% of glycerol, the MG purity in the distillate stream was 80% at evaporator temperature (T (E)) equal to 250 degrees C and feed flow rate (Q) equal to 10.0 mL/min. At these conditions, the MG recovery was 35%. The material collected in the residue stream presented DG-enriched oil with TG unhydrolyzed, residual MG, and low acidity (29.83% of TG, 53.20% of DG, 15.64% of MG, and 1.33% of FFA), which is suitable to replace TG oil in the human diet.

No abstract

The objective of this study is to compare two different strategies for enriching tocopherols in soybean oil deodorizer distillate (SODD) using a molecular distillation process. The first strategy is to submit crude SODD to a sequence of molecular distillations using different temperatures without any preparation of the raw material. The second strategy is to modify chemically the raw material and submit it to a sequence of distillations. In SODD chemical modification, acylglycerol species are converted into free fatty acids (FFAs) and glycerol through a saponification reaction at 65°C followed by an acidulation step. Crude and chemically modified SODD were submitted to five stages of molecular distillation to evaluate and compare the performance of both sequences of distillations. It was observed that the enrichment of tocopherols was 4.1 and 5.8 times higher than the original feed concentration for crude and chemically modified SODD, respectively.

No abstract

No abstract