高湿挤压对组织化大豆蛋白产品特性的影响

以大豆分离蛋白、谷朊粉、低温脱脂豆粕为主要原料,通过带冷却模具的SYSLG30-IV型双螺杆挤压实验机,生产高湿组织化大豆蛋白产品。探讨了挤压过程物料水分、机筒温度、螺杆转速3个因素对产品氮溶解指数的影响规律,同时研究了经过高湿挤压前后试验原料脲酶活性和体外消化率及微观结构的变化。结果表明,经高湿挤压后产品氮溶解指数一般在6.5%～8.5%之间;大豆蛋白脲酶活性大大降低;蛋白质的体外消化率提高12.1%;充分组织化的大豆蛋白结构致密,有弹性,具有明显的组织化结构。

Influence of high moisture extrusion on property of textured soybean protein

Soybean protein isolate (SPI), wheat gluten (WG) and low-temperature defatted soybean (LTDS) as the main raw materials were used to produce high-moisture textured soybean protein (TSP) by SYSLG30-IV twin-screw extruder with cooling die. The effect of the three factors of extrusion processing (material moisture, barrel temperature, screw speed) on the nitrogen solubility index (NSI), the change of urease activity, protein digestibility in vitro, microstructure of extrudate were studied. The results showed that NSI of extrusion ranged from 6.5% -8.5 %; the urease activity of TSP reduced significantly; protein digestibility in vitro increased 12.1% and fully high moisture TSP was with dense structure and springiness, and had obvious texturized structure.