corn gluten powder;  ultrasound;  extraction;  Zeaxanthin

Using corn gluten powder, a by-product of corn starch production, as raw material, ultrasonic technology is used to extract zeacin from corn gluten powder with different organic solvents. The extraction experiment was optimized by orthogonal test, and the absorbance of the extract solution at 446 nm was measured by ultraviolet spectrophotometry as the assessment index. The results showed that the optimal process conditions were 95% ethanol as the extraction solvent, the extraction temperature was 50°C, the ultrasonic time was 1.5 h, the solid-liquid ratio of zeazanthin to 95% ethanol was 1 g:15 mL, the pH value was 7, and the extraction yield could reach 8.7%.