Department of Food Technology, School of Food Science and Technology, Hunan Agricultural University, Changsha, China.
Department of Light Industry and Food Engineering, Guangxi University, Nanning, China.
J Sci Food Agric. 2019 Jun;99(8):4150-4157. doi: 10.1002/jsfa.9645. Epub 2019 Mar 21.
Pullulan is a polysaccharide polymer commonly used to produce edible films. However, pure pullulan film is usually brittle and very hydrophilic, which limit its use in both food and pharmaceutical fields. The objective of this research is to improve the structural and mechanical properties of pullulan film by incorporating globular protein lactoferrin (LF).
The incorporation of LF increased the surface hydrophobicity and decreased the water vapor permeability (WVP) of pullulan film. The presence of low concentrations of LF (< 0.03%) has no significant influence on tensile strength (TS) and elongation at break (EAB) of pullulan film. However, further increase of LF concentration to levels > 0.03% resulted in a film-weakening effect. LF molecules aggregated with each other during the film-producing process, which presented as spherical particles from the observation of microscopy. LF aggregates dispersed homogeneously throughout the pullulan matrix and their size increased with increasing concentration. Analysis from Fourier transform infrared spectroscopy indicated that the secondary structure of LF molecules was modified during the drying process.
It is possible to increase the hydrophobicity of pullulan film while maintaining its mechanical properties. The produced composite film can be potentially used for food and medical packaging. © 2019 Society of Chemical Industry.
出芽短梗霉多糖是一种常用的多糖聚合物，可用于生产可食用薄膜。然而，纯出芽短梗霉多糖膜通常很脆且非常亲水，这限制了它在食品和制药领域的应用。本研究旨在通过添加球状蛋白乳铁蛋白（LF）来改善出芽短梗霉多糖膜的结构和机械性能。
LF 的加入增加了出芽短梗霉多糖膜的表面疏水性并降低了水蒸气透过率（WVP）。低浓度 LF（<0.03%）的存在对出芽短梗霉多糖膜的拉伸强度（TS）和断裂伸长率（EAB）没有显著影响。然而，进一步增加 LF 浓度至>0.03%会导致薄膜变弱。在制膜过程中，LF 分子彼此聚集，从显微镜观察呈现为球形颗粒。LF 聚集体均匀分散在出芽短梗霉多糖基质中，其尺寸随浓度的增加而增大。傅里叶变换红外光谱分析表明，LF 分子的二级结构在干燥过程中发生了变化。
可以在保持出芽短梗霉多糖膜机械性能的同时增加其疏水性。所制备的复合膜可潜在用于食品和医疗包装。 © 2019 化学工业协会。
