Optimization of Stepwise Bleaching of Soybean Oil by Response Surface Methodology

doi:10.7506/spkx1002-6630-201614006

Abstract

Abstract:

A stepwise procedure for bleaching soybean oil was developed on the basis of the principle that multiple
adsorption equilibriums allow effective bleaching of soybean oil. The optimization of processing conditions was done using
one-factor-at-a-time method and response surface methodology. To crude soybean oil, activated clay was added in three
different portions until reaching the same final concentration. The best bleaching efficiency of soybean oil was obtained
when activated clay was added to a final concentration of 1.27% with stirring at 150 r/min for 60 min at 100 ℃. Under these
conditions, the acid value and peroxide value of soybean oil were up to 0.12 mg KOH/g and 3.26 mmol/kg, respectively.
The yellowness and redness of the oil were respectively 18 and 1.45 as measured using a Lovibond tintometer. Compared
with the conventional bleaching process, the new process used 9.29% less activated clay and simultaneously improved the
refining efficiency.

Key words: soybean oil, activated clay, stepwise bleaching, adsorption equilibrium, bleaching efficiency

CLC Number:

TS224.6

WEI Zhenwei, LIANG Baosheng, ZHANG Qing, REN Yue, LIU Xin, YU Dianyu, WANG Junguo. Optimization of Stepwise Bleaching of Soybean Oil by Response Surface Methodology[J]. FOOD SCIENCE, doi: 10.7506/spkx1002-6630-201614006.

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