Ondaral Sedat, Çelik Elif, Kurtuluş Orçun Çağlar
1 Department of Cellulose Chemistry and Technology, Forest Product Engineering, Faculty of Forestry, Karadeniz Technical University, Trabzon, Turkey.
2 Forest Product Engineering, Faculty of Forestry, Kastamonu University, Kastamonu, Turkey.
J Appl Biomater Funct Mater. 2019 Jan-Mar;17(1):2280800019826513. doi: 10.1177/2280800019826513.
Phosphate-buffered saline (PBS) adsorption on model films composed of gelatin and nanofibrillated celluloses (NFCs) with different aldehyde and carboxyl contents was studied by means of the quartz crystal microbalance with dissipation (QCM-D) technique in this study. The results showed that frequency shift (Δ f) due to PBS adsorption increased with increasing gelatin content to 50% in NFC-containing films. The dissipation shift and adsorption rate of PBS followed the same trend. Model films with NFC-1 having 1.22 mmol/g aldehyde and 0.6 mmol/g carboxyl groups adsorbed more PBS than those consisting of NFC-2 with 0.25 mmol/g aldehyde and 1.15 mmol/g carboxyl groups except for film composed of 50% gelatin. However, adsorption rate of PBS was found to be slower for NFC-1 containing film because the acetal and amidol bonds formed by functional groups in the network of cellulose and gelatin needed more time to let PBS migrate into the films.
本研究采用具有耗散功能的石英晶体微天平（QCM-D）技术，研究了磷酸盐缓冲盐水（PBS）在由明胶和具有不同醛基和羧基含量的纳米纤化纤维素（NFC）组成的模型膜上的吸附情况。结果表明，含NFC的膜中，由于PBS吸附导致的频率偏移（Δf）随着明胶含量增加至50%而增大。PBS的耗散偏移和吸附速率呈现相同趋势。除了由50%明胶组成的膜之外，具有1.22 mmol/g醛基和0.6 mmol/g羧基的NFC-1组成的模型膜比由0.25 mmol/g醛基和1.15 mmol/g羧基的NFC-2组成的模型膜吸附更多的PBS。然而，发现含NFC-1的膜对PBS的吸附速率较慢，因为纤维素和明胶网络中的官能团形成的缩醛键和酰胺醇键需要更多时间让PBS迁移到膜中。
