Comparative evaluation of rice bran oil obtained with two-step microwave assisted extraction and conventional solvent extraction

摘要: Abstract In the present study, an innovative approach for microwave assisted solvent extraction of rice bran oil (RBO) in two steps termed two-step (TSMAE) has been adopted. Microwave treatment and washing were done alternately steps. The effect power (200, 320, 450, 560 W), exposure time (30, 60, 90, 120 s) to ratio (1.6, 2.3, 3 mL/g) per step on percentage recovery TSMAE evaluated. Bran milled at 3–6% degree polish was evaluated recovery. Oil more than 95% obtained total 8–10 min with only 1.6–2.3 mL/g (per step). overall quality found be superior that conventional extracted especially respect phospholipid content (0.64 ± 0.11 vs 1.02 ± 0.15%), α-tocopherol (7.85 ± 0.19 6.83 ± 0.12 mg/g RBO), antioxidant activity (1.50 ± 0.05 1.27 ± 0.08 trolox equivalent activity) free fatty acid (4.88 ± 0.26 5.77 ± 0.25%). Microstructure analysis revealed cell rupture due suggests reason faster TSMAE.