紫玉米芯花青素的超声波辅助提取及喷雾干燥的工艺优化

以紫玉米芯为原料,利用响应面实验优化花青素的超声波辅助提取工艺,并将获得的花青素冻干粉添加麦芽糊精,后经喷雾干燥制成花青素粉。响应面实验结果表明,最佳提取条件为:料液比为1∶13(g/m L)、提取温度为41℃、水浴提取时间为31 min、超声提取时间为20 min,在此条件下,得到花青素提取量为(4.623±0.021)mg/g,提取率为94.8%。花青素提取液添加麦芽糊精,经喷雾干燥工艺制成花青素粉,在进风温度为150℃、花青素冻干粉与麦芽糊精质量比为1∶1、固形物浓度为15%时,得到的花青素粉包埋率为86.7%,水分含量为4.8%。本实验得到了紫玉米芯花青素超声辅助提取和花青素粉制备的最佳工艺条件,为紫玉米芯的开发利用提供了参考依据。 

Optimization of ultrasonic-assisted extraction and spray drying of anthocyanins from purple corn cob

Response surface methodology was used to optimize the ultrasonic assisted extraction conditions of anthocyanin from purple corn cob and improve the extraction rate.Anthocyanin freeze-dried powder mixed with maltodextrin was processed into powder by spray drying method. The results showed that the optimum conditions were as follows: the solid-liquid ratio, extraction temperature, extraction time and ultrasonic time were 1 ∶ 13 ( g/m L) , 41 ℃, 31 min and 20 min, respectively. The anthocyanin content and the extraction yield were ( 4.623 ± 0.021) mg/g and 94.8% at this condition. The anthocuanin powder had low moisture 4.8% and embedding rate 86.7% when the inlet air temperature, the mass ratio ( anthocyanin∶ maltodextrin) and the solid concentration during spray-drying were 150 ℃, 1 ∶ 1 and 15%, respectively. The conditions of anthocyanin extraction from purple corn cob and anthocyanin powder preparation were optimized by the single factor experiment and the response surface methodology, and the results provided a reference for the development of purple corn cob.