玉米磷酸酯淀粉/秸秆纤维素可食膜的制备及物理性能

Preparation and Physical Properties of Corn Distarch Phosphate/Corn Straw Cellulose Edible Film

以玉米磷酸酯淀粉(corn distarch phosphate,CDP)和玉米秸秆纤维素(corn straw cellulose,CSC)为主要基材制备可食膜。研究CDP与CSC质量比、羧甲基纤维素(carboxymethyl cellulose,CMC)质量浓度、丙三醇(glycerol,Gly)质量浓度对可食膜物理性能抗拉强度(tensile strength,TS)、断裂伸长率(elongation at break,EAB)、水蒸气透过系数(water vapour permeability,WVP)和透光率的影响。在此基础上以可食膜的物理性能综合分为响应值,采用响应面法优化制备工艺参数。结果表明:最佳工艺条件为CDP-CSC质量比8.5∶1.5、CMC质量浓度0.8 g/100 mL、Gly质量浓度1.0 g/100 mL,此条件下可食膜物理性能综合分最高为0.683,对应可食膜的TS为19.75 MPa、EAB为46.89%、WVP为1.167×10^(-12)g/(cm·s·Pa)、透光率为41.86%,比未添加CSC的CDP膜物理性能综合分提高27.14%。通过扫描电子显微镜、X射线衍射和傅里叶变换红外光谱分析对可食膜进行结构观察和表征,表明CDP/CSC可食膜表面较平整,结构致密,各基质相容性好。

Edible composite films were prepared using corn starch phosphate（CDP） and corn straw cellulose（CSC） as the main ingredients.The effects of CDP to CSC ratio,carboxymethyl cellulose（CMC） concentration,and glycerol（Gly） concentration on the physical properties such as tensile strength（TS）,elongation at break（EAB）,water vapor permeability（WVP） and transmittance（T） of the edible films were studied.Further,using the comprehensive score for the physical properties as response value,the optimum process conditions were obtained by response surface analysis as follows： CDP and CSC ratio,8.5：1.5; CMC concentration,0.8 g/100 mL; and Gly concentration,1.0 g/100 mL.Under these conditions,the physical properties of edible films were the best overall with a score as high as 0.683,which was increased by 27.14%compared with that of the edible films with no added CSC,and the TS,EAB,WVP and T were 19.75 MPa,46.89%,1.167×10^-12 g/（cm·s·Pa） and 41.86%,respectively.As observed and characterized by scanning electron microscopy（SEM）,X-ray diffraction（XRD） and Fourier transform infrared spectroscopy（FT-IR）,the surface of the CDP/CSC edible films was smooth,showing a dense structure and good compatibility of the ingredients.