Compositional study on rice bran oil after lipase-catalyzed glycerolysis and solvent fractionations

J Food Sci. 2007 Apr;72(3):C163-7. doi: 10.1111/j.1750-3841.2007.00299.x.

Abstract

Rice bran oil (RBO) was modified through lipase-catalyzed glycerolysis. After 48 h reaction, the reactant (RBO-G, solved in hexane) containing 0.14 mg/mL of MAG, 0.19 mg/mL of DAG, and 0.93 mg/mL of TAG was obtained. Extending the reaction to 72 h resulted in 0.37 mg/mL of DAG with concomitant reduction in TAG (0.68 mg/mL). Two solvent fractionation methods, independent and sequential fractionation, were performed with acetone and hexane at 0, -8, -14, or -35 degrees C. The fraction with most unsaturated fatty acids (Sigma UFA) was liquid fraction from independent fractionation at -35 degrees C (-35 In) from hexane, showing 88.3%Sigma UFA content. Nevertheless, when yield (wt%) was considered, the highest amount of UFA was obtained from 0 In (liquid fraction from independent fractionation at 0 degrees C) with hexane, resulting in 82.3%Sigma UFA with 97.9 wt% recovery. Normal-phase HPLC was conducted for the compositional study of RBO-G. Overall, solid fractions from sequential fractionation at 0 degrees C (0 SeSo) and independent fractionation at -35 degrees C (-35 InSo) with hexane contained the high concentration of total MAG and DAG, ranging from 0.94 to 1.35 (mg/mL).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Chemical Fractionation
  • Chemistry Techniques, Analytical
  • Diglycerides / analysis
  • Diglycerides / metabolism*
  • Lipase / metabolism*
  • Monoglycerides / analysis
  • Monoglycerides / metabolism*
  • Plant Oils / chemistry*
  • Plant Oils / metabolism*
  • Rice Bran Oil
  • Solvents
  • Triglycerides / analysis
  • Triglycerides / metabolism*

Substances

  • Diglycerides
  • Monoglycerides
  • Plant Oils
  • Solvents
  • Triglycerides
  • Lipase
  • Rice Bran Oil