摘要
利用DS30-III型双螺杆挤压膨化机对绿茶茶渣进行挤压膨化加工,在单因素试验的基础上,选取了物料含水量、喂料速度、螺杆转速、套筒温度为影响因子,以绿茶茶渣中没食子酸为响应面值,应用响应面设计方法建立数学模型,进行响应面分析。结论表明,获得高没食子酸含量的最佳工艺参数为:物料含水量70%,喂料速度58 r/min,螺杆转速60 r/min,套筒温度60℃。挤压膨化参数对没食子酸含量影响的大小依次为:物料含水量>螺杆转速>套筒温度>喂料速度。经过最佳挤压膨化参数处理的绿茶茶渣中没食子酸含量为3.57 mg/g,与原料相比,没食子酸含量增加2.69 mg/g。
Researcher extruded green tea-leaves with DS30-Ⅲ twin-screw extruder. According to single factor investigation, the mathematical models with the content of Gallic acid as the responses to moisture content of material, feeding speed, rotational speed of screw and temperature of barrel were established by using response surface design. It was followed by response surface analysis. The results showed that the optimal extrusion parameters of high content of Gallic acid in green tea -leaves were that moisture content of material was 70 %, feeding speed rotational was 58 r/min, speed of screw was 60 r/min and temperature of barrel was 60 ℃. The significance of parameters on the content of Gallic acid in green tea-leaves was decreased according to the ranking of moisture content of material 〉 rotational speed of screw 〉temperature of barrel 〉feeding speed. The content of Gallic acid in the tea-leaves that is dealt with optimal extrusion parameters was 3.57 mg/g, compared with the raw materials before extrusion; the content of Gallic acid had a increase of 2.69 mg/g.
出处
《食品研究与开发》
CAS
北大核心
2014年第4期8-14,共7页
Food Research and Development
基金
浙江省重大科技专项重点农业项目(2009C12029)
