Recovery of vitamins B from supercritical carbon dioxide-defatted rice bran powder using ultrasound water extraction

This study investigates the ultrasonic water extraction of vitamins B from supercritical carbon dioxide-defatted rice bran powder. Experimental data show that when the vitamins B content in the defatted extract reached 0.63% (wt), the extract was healthy. The effects of the solvent to solid ratio and the extraction time on the total yield, extraction efficiency, purification factor and purity of vitamins B in the extract were also determined. A two-factor center composite response surface method was adopted to optimize the condition for ultrasonic water extraction. Both parameters are important. The solvent to solid ratio has a greater influence on total yield than the extraction time. However, the extraction time is the most important in increasing the efficiency of extraction of vitamins B. Given an appropriate solvent to solid ratio, the vitamins B content in the defatted rice bran extract increased substantially with extraction time, exceeding that of the raw rice bran extract. Ultrasonic water extraction at a solvent to solid ratio of 10.0 at 323 K for 1.5 h yields a vitamin B content of 0.63%, a purification factor of 4.55 and a recovery rate of vitamins B of 92.8% in the dried defatted rice bran extract.