Key Laboratory of Bio-based Materials Science and Technology of Ministry of Education , Northeast Forestry University , 26th Hexing Road , Xiangfang District, Harbin 150040 , P. R. China.
Research Center of Wood Bionic Intelligent Science , Northeast Forestry University , 51th Hexing Road , Xiangfang District, Harbin 150040 , P. R. China.
J Agric Food Chem. 2019 Feb 20;67(7):2066-2074. doi: 10.1021/acs.jafc.8b06493. Epub 2019 Feb 12.
To prepare intelligent cellulose fiber (ICF), cellulose fibers were modified by grafting hydroxypropyltriethylamine groups to which bromothymol blue (BTB) was anchored. The ICFs were incorporated into cassia gum (CG) to prepare a pH-sensitive intelligent film. The Fourier transform infrared results indicated that BTB has been introduced in the CG-ICF5 film. Scanning electronic microscopy indicated that the addition of ICF can loosen the structure of the film. The incorporation of ICF decreased light transmittance and water vapor permeability but did not significantly affect thermal stability. The mechanical properties were weakened with 3% ICF addition and were improved with 5% ICF addition. The release experiment indicated that 46.784% and 8.297% of BTB was released from the CG-ICF5 film under oscillating to 50% and 95% alcohol/water solution, respectively. The response of the intelligent films to triethylamine in environments with different relative humidities was investigated. A visible color change occurred in the triethylamine environment within 20 min. Pork and chicken spoilage experiments were performed to study the application of the intelligent film in monitoring meat freshness during spoilage. Obvious color changes appeared, demonstrating that the intelligent film has potential for use in real-time indication of meat spoilage.
为了制备智能纤维素纤维（ICF），对纤维素纤维进行了接枝羟丙基三乙胺基团的改性，其中接枝了溴百里酚蓝（BTB）。将 ICF 掺入刺槐豆胶（CG）中以制备 pH 敏感的智能薄膜。傅里叶变换红外结果表明，BTB 已被引入 CG-ICF5 薄膜中。扫描电子显微镜表明，加入 ICF 可以疏松薄膜的结构。加入 ICF 会降低透光率和水蒸气透过率，但对热稳定性没有显著影响。加入 3%的 ICF 会使力学性能减弱，而加入 5%的 ICF 会使力学性能提高。释放实验表明，CG-ICF5 薄膜在分别置于 50%和 95%的乙醇/水溶液中振荡时，BTB 的释放量分别为 46.784%和 8.297%。研究了智能薄膜对不同相对湿度环境中三乙胺的响应。在三乙胺环境中，20 分钟内发生了明显的颜色变化。进行了猪肉和鸡肉腐败实验，以研究智能薄膜在监测腐败过程中肉类新鲜度方面的应用。明显的颜色变化表明，智能薄膜在实时指示肉类腐败方面具有潜在的应用价值。
