Zhao Yuanjiang, Bai Tianwen, Liu Yuhang, Lv Yichao, Zhou Zhuxian, Shen Youqing, Jiang Liming
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China.
Key Laboratory of Biomass Chemical Engineering of Ministry of Education and Zhejiang Key Laboratory of Smart Biomaterials, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China.
Nanomaterials (Basel). 2022 Dec 25;13(1):104. doi: 10.3390/nano13010104.
In this work, we synthesized mesoporous silica nanoparticles (MSNs) and periodic mesoporous organosilica nanoparticles containing bridging groups of ethylene (E-PMO) and phenylene (P-PMO) and compared their adsorption properties using D-limonene (Lim), myrcene (Myr), and cymene (Cym) as model guest molecules. For the selected nanoparticles of 100 nm in diameter, the loading capacity to the volatile fragrances was in the order of P-PMO < E-PMO < MSN, consistent with the trend of increasing total pore volume. For example, P-PMO, E-PMO, and MSN had a Lim uptake of 42.2 wt%, 47.3 wt%, and 62.7 wt%, respectively, which was close to their theoretical adsorption capacity. Under isothermal thermogravimetric analysis conditions (30 °C, a N2 flow of 1 mL min−1), the lowest fragrance release of ~56% over 24 h was observed for P-PMO, followed by E-PMO (74−80%), and MSN (89%). The release kinetics of the fragrant molecules from MSN and PMO materials can be well described by first-order and Weibull models, respectively. Moreover, the incorporation of Lim-loaded P-PMO NPs in an aqueous solution of regenerated silk fibroin provided a composite coating material suitable for perishable fruit preservation. The active layer deposited on fruit peels using dip coating showed good preservation efficacy, enabling the shelf-life of mangoes in a highly humid and hot atmosphere (30−35 °C, 75−85% RH) to be extended to 6 days.
在这项工作中，我们合成了介孔二氧化硅纳米颗粒（MSNs）以及含有乙烯桥基（E-PMO）和亚苯基桥基（P-PMO）的周期性介孔有机硅纳米颗粒，并以D-柠檬烯（Lim）、月桂烯（Myr）和对异丙基苯（Cym）作为模型客体分子比较了它们的吸附性能。对于选定的直径约为100 nm的纳米颗粒，其对挥发性香料的负载能力顺序为P-PMO < E-PMO < MSN，这与总孔体积增加的趋势一致。例如，P-PMO、E-PMO和MSN对Lim的吸附量分别为42.2 wt%、47.3 wt%和62.7 wt%，接近它们的理论吸附容量。在等温热重分析条件下（30 °C，氮气流量1 mL min−1），P-PMO在24小时内观察到的最低香料释放率约为56%，其次是E-PMO（74−80%），MSN约为89%。MSN和PMO材料中香料分子的释放动力学分别可以用一级模型和威布尔模型很好地描述。此外，将负载Lim的P-PMO纳米颗粒掺入再生丝素蛋白水溶液中，得到了一种适用于易腐水果保鲜的复合涂层材料。采用浸涂法沉积在果皮上的活性层显示出良好的保鲜效果，能够将芒果在高湿度和高温环境（30−35 °C，75−85% RH）下的货架期延长至6天。
