College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China; Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning 530004, China.
College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China; Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning 530004, China.
Int J Biol Macromol. 2020 Apr 15;149:271-280. doi: 10.1016/j.ijbiomac.2020.01.231. Epub 2020 Jan 24.
A pH indicator and antimicrobial cellulose nanofibre packaging film was developed based on cellulose nanofibres as film matrix, anthocyanins from purple sweet potato as a natural dye and oregano essential oil as an antimicrobial agent. The colour of the anthocyanin solution was noticeably different from pH 2 to pH 12. The developed film sensitively responded to a change of pH and showed an obvious colour change from red to yellow, with pH ranging from 2 to 12, which indicated that the film had a superior colorimetric performance to pH change. Moreover, the film showed excellent antimicrobial activity and the inhibition rate against Escherichia coli and Listeria monocytogenes reached 99.99%. Bio-compatibility between anthocyanins and cellulose nanofibre matrix was confirmed by the analysis of cross-section morphology of the film. The XRD pattern revealed that the crystallinity index of the film decreased with the addition of anthocyanins and oregano essential oil. The film had a good barrier performance to ultraviolet and visible light; its tensile strength, elongation at break, and elastic modulus was 9.28 MPa, 9.87%, and 0.15 GPa, respectively. The developed pH indicator and antimicrobial film could intuitively indicate the change of food quality during storage and effectively prolong food shelf life.
基于纤维素纳米纤维作为膜基质，紫甘薯中的花色苷作为天然染料，牛至精油作为抗菌剂，开发了一种 pH 指示剂和抗菌纤维素纳米纤维包装膜。花色苷溶液的颜色在 pH 2 到 pH 12 之间有明显的差异。所开发的薄膜对 pH 的变化敏感，并显示出从红色到黄色的明显颜色变化，pH 值范围从 2 到 12，这表明该薄膜具有优越的比色性能来检测 pH 值的变化。此外，该薄膜表现出优异的抗菌活性，对大肠杆菌和单核细胞增生李斯特菌的抑制率达到 99.99%。通过对薄膜横截面形态的分析，证实了花色苷与纤维素纳米纤维基质之间的生物相容性。XRD 图谱表明，随着花色苷和牛至精油的加入，薄膜的结晶度指数降低。该薄膜对紫外线和可见光具有良好的阻隔性能；其拉伸强度、断裂伸长率和弹性模量分别为 9.28 MPa、9.87%和 0.15 GPa。所开发的 pH 指示剂和抗菌膜可以直观地指示储存过程中食品质量的变化，并有效延长食品的保质期。
