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[Study on the encapsulation technique of high purity gamma-linolenic acid, part 1--Single factor, and two-factor
Feng-Xia Liu1, Gang Xue, Qiu-Hua Gao
1Central China University of Science & Technology, Wuhan 430074, China.
Objective:
To study the effects of all factors during the process of urea encapsulation of gamma-linolenic acid on the purity and yield.
Method:
To observe the material proportions, time, temperature and purity using single-factor and two-factor tests.
Result:
Single-factor test showed that the optimal ratio of all materials (oil, urea and 95% ethanol) was 1:3:8. A 30% purity after single encapsulation process was obtained, at the best temperature range was - 15 degrees C-20 degrees C, for 24 hours. Two-factor test showed that the optimal ratio of oil, urea and ethanol was 1:3:8, where the concentration of ethanol was 90%-95%. The purity reached 90% or higher, with three-time encapsulation process.
Conclusion:
An optimized process was identified where material ratios, encapsulation time, temperature, and ethanol concentrations were determined using single-factor and two-factor tests.
