魔芋葡甘聚糖基栀子黄色素膜的制备及性能研究

Preparation and Characterization of Konjac Glucomannan Based Gardenia Yellow Pigment Film

为探究天然色素分子与多糖大分子的成膜性能和相互作用,增进多糖膜的多元化发展,以魔芋葡甘聚糖(KGM)和琼脂为成膜溶液的基材,引入天然色素栀子黄制备KGM基栀子黄膜,通过溶液流延法分析其成膜性,应用扫描电镜和红外光谱研究其微观结构和分子互作,采用质构仪检测膜的拉伸强度和断裂伸长率,并以水接触角分析仪和差示扫描量热仪分析膜的亲水性和热稳定性。结果表明,所制备的栀子黄膜成膜性良好,颜色均匀柔和,微观结构均一、致密,无相分离,栀子黄在成膜溶液中溶解性和分散性良好;红外图谱表明栀子黄与KGM和琼脂分子间的化学结构和性质并未改变,可能有新的氢键产生;栀子黄的加入没有弱化KGM-Agar膜的力学性能,适量栀子黄可明显增强膜亲水性,栀子黄对其热稳定性影响不大,贮藏后颜色稳定,表明栀子黄适合用于多糖基膜。

In order to explore the film forming performance and interaction between natural pigment molecules and polysaccharide macromolecules,and to promote the diversified development of polysaccharide film,this study used konjac glucomannan(KGM)and agar as the substrate of film forming solution,and introduced natural pigment gardenia yellow to prepare KGM-based gardenia yellow film.The film formation was analyzed by solution casting method.The microstructure and molecular interaction were studied by scanning electron microscopy and infrared spectroscopy.The tensile strength and elongation at break were measured by texture analyzer.The hydrophilicity and thermal stability of the film were analyzed by water contact angle analyzer and differential scanning calorimeter.The results showed that the prepared gardenia yellow films had good film forming properties,uniform and soft color,uniform and compact microstructure,and no phase separation.Gardenia yellow had good solubility and dispersion in film forming solution.FT-IR showed that the chemical structure and properties between gardenia yellow,KGM and agar molecules did not change,and there might be new hydrogen bonds.The addition of gardenia yellow did not weaken the mechanical properties of KGM-Agar film,and proper amount of gardenia yellow can obviously enhance the hydrophilicity of the film.Gardenia yellow had little effect on its thermal stability,and the color was stable after storage.These indicated that gardenia yellow was suitable for polysaccharide-based film.