J Agric Food Chem. 2018 Apr 4;66(13):3457-3464. doi: 10.1021/acs.jafc.8b00393. Epub 2018 Mar 20.
Alkali lignin (AL), an anionic polymer, is a byproduct of the paper industry. AL was first modified by quaternization to synthesize quaternized alkali lignin (QAL). The aim of the present study is to reveal the effects of sodium dodecyl benzenesulfonate (SDBS) on the microstructure of QAL. The interaction between SDBS and QAL is studied by means of zeta potential, fluorescence spectrophotometer, and static contact angle measurement. The results indicated that there is an electrostatic interaction and a hydrophobic interaction between QAL and SDBS. The SDBS/QAL complex can self-assemble into lignin-based colloidal spheres (LCSs) in an ethanol/water mixture, which have remarkable avermectin (AVM) encapsulation efficiency and antiphotolysis performance. The cumulative release amount of AVM encapsulated by LCS (LCS@AVM) after 72 h was 77%, and the release was still going on. The release behaviors of LCS@AVM can be controlled by adjusting the ratio (w/w) of LCS to AVM. More than 85% of AVM could be preserved even after 96 h of UV irradiation. LCS showed controlled release and UV-blocking performance for AVM.
碱木素（AL）是一种阴离子聚合物，是造纸工业的副产品。AL 首先通过季铵化反应进行改性，合成季铵化碱木素（QAL）。本研究旨在揭示十二烷基苯磺酸钠（SDBS）对 QAL 微观结构的影响。通过动电位、荧光分光光度计和静态接触角测量研究了 SDBS 与 QAL 之间的相互作用。结果表明，QAL 与 SDBS 之间存在静电相互作用和疏水相互作用。SDBS/QAL 复合物可以在乙醇/水混合物中自组装成基于木质素的胶体球（LCS），具有显著的阿维菌素（AVM）包封效率和抗光解性能。LCS 包封的 AVM 在 72 h 后的累积释放量为 77%，并且仍在继续释放。通过调整 LCS 与 AVM 的比例（w/w）可以控制 LCS@AVM 的释放行为。即使在 96 h 的紫外线照射后，仍能保留超过 85%的 AVM。LCS 对 AVM 表现出控释和紫外屏蔽性能。
