Composition of Solvent‐fractionated Rice Bran Oil

Abstract

Rice bran oil was acetone fractionated at low temperature. Two methods, independent fractionation (−8, −14 and −35C) and sequential fractionation (0, −8 and −14C), were compared for the preparation of triacylglycerol (TG) fraction‐enriched unsaturated fatty acids (UFAs). Among all fractions obtained from both methods, the liquid fraction from independent fractionation at −35C referred to as −35L was the best (89.6%) compared to other procedures used for enrichment of UFAs. However, when weight yield was considered, the largest amount of UFAs was obtained from the liquid fraction at 0C (0L) from sequential fractionation. After sequential fractionation at 0C, 87.5 wt % was recovered in the liquid fraction that contained 71.5% total UFAs. In addition, as the fractionation temperature was lowered, the content (%) of γ‐oryzanol in the liquid fractions was increased gradually. Reversed‐phase high‐performance liquid chromatography showed four regions based on the partition number of TG molecules of the separated peaks.

Enzymatic transesterification of fractionated rice bran oil with conjugated linoleic acid: Optimization by response surface methodology

“…RBO (300 ml) and acetone (1500 ml) were mixed (ratio ¼ 1:5, v/v) together in a 3-l conical flask (Yu et al, 2006). The conical flask containing RBO and acetone mixture was placed in a deep freezer at À16 1C.…”

Obtenção de ácidos graxos por cristalização do óleo de pescado fracionado por hidrólise enzimática

“…A fase líquida da cristalização da fração MAG apresenta aproximadamente duas vezes a concentração do ácido docosahexenoico (C22:6) originalmente encontrado no óleo de pescado, indicando que é uma possibilidade para sua separação e purificação. Resultado similar foi encontrado na fase líquida das frações do óleo de arroz cristalizado a baixas temperaturas (YU et al 2006).…”

Synthesis of esterified solid fat from fractionated rapeseed oil and palm stearin modeling by response surface methodology

“…The conical flask was placed in a deep freezer at a temperature of -20ºC for fractionation. The liquid part of RSO (L-RSO) was separated from the solid part of RSO (S-RSO) by decanting after 24 h, and the acetone was evaporated completely from both parts by a rotary vacuum evaporator by a stream of nitrogen (Yu et al, 2006). Then the S-RSO was taken for further use in this study.…”