Lu Qilin, Wu Jiayin, Wang Hanchen, Huang Biao
Fujian Key Laboratory of Novel Functional Textile Fibers and Materials, Minjiang University, Fuzhou 350108, China.
College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
Polymers (Basel). 2022 Mar 24;14(7):1313. doi: 10.3390/polym14071313.
Fluorescent cellulose nanofibers (FCNFs), with a high yield, were prepared via one-pot hydrolysis and the grafting reaction of cellulose with thiazolipyridine carboxylic acid (TPCA). The hydrolysis and Fischer esterification of cellulose were conducted under microwave-hydrothermal conditions; meanwhile, TPCA formation was induced by the dehydration reaction between L-cysteine and citric acid. The effects of the reaction temperature and reaction time on the yield and performance of FCNF were investigated. The morphology and size, surface chemical property, crystal structure, thermostability, and fluorescent performance of FCNF were characterized. The results revealed that the yield of FCNF reached 73.2% under a microwave power of 500 W, reaction temperature of 110 °C, and reaction time of 5 h. The FCNF obtained presents a short rod-like morphology. The crystallinity of the FCNFs is 80%, and their thermal stability did not decline significantly. Additionally, the fluorescent performance of the FCNFs is excellent, which results in them having good sensitivity to chloride ions. The good fluorescent performance and significant responsiveness to chloride ions of FCNFs lead to them having broad prospects in bio-labeling, biosensing, information storage, chloride ion detection, among others.
通过一锅法水解以及纤维素与噻唑吡啶羧酸（TPCA）的接枝反应制备了高产率的荧光纤维素纳米纤维（FCNFs）。纤维素的水解和费歇尔酯化反应在微波水热条件下进行；同时，L-半胱氨酸与柠檬酸之间的脱水反应诱导了TPCA的形成。研究了反应温度和反应时间对FCNF产率和性能的影响。对FCNF的形态和尺寸、表面化学性质、晶体结构、热稳定性和荧光性能进行了表征。结果表明，在微波功率500W、反应温度110℃、反应时间5h的条件下，FCNF的产率达到73.2%。所得FCNF呈现短棒状形态。FCNFs的结晶度为80%，其热稳定性没有明显下降。此外，FCNFs具有优异的荧光性能，使其对氯离子具有良好的敏感性。FCNFs良好的荧光性能和对氯离子的显著响应性使其在生物标记、生物传感、信息存储、氯离子检测等方面具有广阔的前景。
