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 (Δf) 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.

中文翻译：

---

磷酸盐缓冲盐水对由纳米原纤化纤维素和明胶组成的模型膜的吸附

在这项研究中，磷酸盐缓冲盐水 (PBS) 在由不同醛和羧基含量的明胶和纳米原纤维化纤维素 (NFCs) 组成的模型膜上的吸附作用通过石英晶体微天平与耗散 (QCM-D) 技术进行了研究。结果表明，在含 NFC 的薄膜中，由于 PBS 吸附引起的频移 (Δf) 随着明胶含量增加到 50% 而增加。PBS 的耗散位移和吸附速率遵循相同的趋势。NFC-1 具有 1.22 mmol/g 醛和 0.6 mmol/g 羧基的模型薄膜比 NFC-2 具有 0.25 mmol/g 醛和 1.15 mmol/g 羧基的薄膜吸附更多的 PBS，除了由 50% 明胶组成的薄膜. 然而，