表面活性剂对玉米醇溶蛋白成膜性的研究

Study on the film-forming properties of surfactants on zein

玉米醇溶蛋白具有独特的成膜性,但其较低的机械性能和较差的柔韧性,其应用受到了一定的限制。本研究以玉米醇溶蛋白为原料,采用表面活性剂大豆卵磷脂和大豆改性磷脂进行改性处理,经过单因素实验和响应面实验,结果发现大豆改性磷脂进行改性处理后能够得到性能更佳的膜层,最佳工艺为乙醇浓度81%,改性时间15 min,玉米醇溶蛋白与大豆改性磷脂的物料比为9.6∶1,此条件下玉米醇溶蛋白膜水蒸气透过率低至(2.29±0.18)g·m/(m~2·d·kPa),透光率为(29.47±1.85)%,吸水率为(46.03±1.83)%,透油系数为(5.49±0.97)g·mm/m~2·d,硬度低至(2496.37±84.65)gf,此条件下,膜的硬度适中,为玉米醇溶蛋白的改性提供了参考。

Zein is an excellent film, but, the brittleness characteristic and poor mechanical properties limit its industrial application. Zein was used as raw material, and soybean lecithin and modified soy lecithin were used for modification treatment. It was found that modified treatment with modified soy lecithin could obtain a film with better performance by single factor experiment and response surface methodology. The best formula obtained from the experiment was that the concentration of ethanol was 81%,the modification time was 15 min, and the material ratio of zein to modified soy lecithin was 9.6∶1. Under these conditions, the water vapor transmission rate was as low as 2.29±0.18 g·mm/m~2·d·kPa, light transmittance was 29.47±1.85%,the water absorption rate was 46.03±1.83%,the oil permeability was 5.49±0.97 g·mm/m~2·d, the hardness was 2496.37±84.65 gf. Under the condition, the hardness of the film was moderate, which can provide a reference for the development of a new type of zein film.