短直链淀粉纳米颗粒涂层制备超亲水淀粉膜

Preparation of Superhydrophilic Starch Films by Short-Chain Amylose Nanoparticles Coating

采用蜡质玉米淀粉为原料,经普鲁兰酶脱支处理,制备短直链淀粉。将短直链淀粉糊化后的溶液,通过膜材浸泡的方式,使淀粉膜表面形成短直链淀粉涂层,再通过4℃的老化处理,制备超亲水淀粉膜。对超亲水淀粉膜的表面形貌、结晶结构、红外光谱及亲水性进行了研究。结果表明,短直链淀粉在淀粉膜表面自组装成了纳米颗粒结构,增加了膜材表面的粗糙度,改善了淀粉膜的亲水性能。当短直链淀粉溶液质量浓度为0.010 g/mL时,可获得水接触角接近于0°的超亲水淀粉膜。

Short-chain amylose was prepared by debranching waxy starch with pullulanase.The starch film was dipped in the short-chain amylose solution gelatinized by microwave,and then aged at 4℃to get superhydrophilic starch films.The surface morphology,crystal structure,infrared spectrum and hydrophilicity of superhydrophilic starch film were studied.The experimental results showed that nanoparticle structure of short-chain amylose was self-assembled on the surface of starch film,which increased the surface roughness and improved the hydrophilicity of starch film.When the mass concentration of short-chain amylose solution was 0.010 g/mL,the superhydrophilic starch film with a water contact angle close to 0°could be obtained.