Abstract:

Low-calorie structured lipids were synthesized by lipase-catalyzed reaction and purified by secondary molecular
distillation. The effect of molecular distillation parameters on acid value and purity of low-calorie structured lipids were
investigated. The process parameters of secondary molecular distillation were optimized by the combined use of single factor
method and response surface methodology. The results showed the degree of fitting of the regression model was good. The
optimum secondary molecular distillation process was achieved at 122 ℃ with a scraper speed of 240 r/min and a feeding
rate of 2.0 mL/min. The acid value of the resulting low-calorie structured lipids was reduced to 0.93 mg KOH/g with a purity
of 60.25%.

Key words: molecular distillation, low-calorie structured lipids, acid value, purity, purification