Production of alcohol leached peanut protein concentrate

The production conditions of peanut protein concentrate from defatted peanut protein powder by alcohol extraction were optimized by single factor experiment and orthogonal experiment and verified by scale-up experiment. The results showed that the optimal production conditions were obtained as follows: volume fraction of alcohol 65%,ratio of material to liquid 1∶ 8,extraction temperature 60 ℃,extraction time 40 min,extraction times three. Under the optimal conditions,the protein content and nitrogen solubility index(NSI) of the peanut protein concentrate were 72% and 42% respectively. Furthermore,an enlarged alcohol leached process was performed at a dose of 100 g under the optimal conditions,and the protein content and NSI of the peanut protein concentrate were 70% and 40% respectively.