Sugarcane leaf-derived organosolv lignin as antibacterial and antioxidant agents of natural rubber composites

Cleaner Materials Pub Date : 2024-11-25 DOI:10.1016/j.clema.2024.100280

Kamonwat Nakason , Parinvadee Chukaew , Yuwanda Thongpanich , Fuangfa Utrarachkij , Sanchai Kuboon , Wasawat Kraithong , Skulrat Pichaiyut , Wanwitoo Wanmolee , Bunyarit Panyapinyopol

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Abstract

To enhance the sustainability and carbon neutrality of natural rubber (NR) derived product, lignin extracted from sugarcane leaf (SCL) was incorporated into NR to prepare environmentally friendly antibacterial (AB) and antioxidant (AO) lignin/NR composites. In this study, SCL lignin was isolated via an organosolv process at different temperatures (140 – 180 °C) and using various organic solvents (ethanol, acetone, and isopropyl alcohol (IPA)). Disk diffusion susceptibility tests, minimum inhibitory concentration (MIC), and minimum bactericidal concentration (MBC) demonstrated the AB efficacy of SCL organosolv lignin against Gram-positive bacteria (S. aureus) compared to Gram-negative bacteria (E. coli and S. Typhimurium). The choice of solvent gradually influenced the AB and AO performances of the lignin. Py-GC/MS analysis revealed that SCL organosolv lignin predominantly comprised p-hydroxyphenyl (H’) and guaiacyl (G’) with a minor presence of syringyl (S’) lignin. The incorporation of SCL organosolv lignin into NR showed that NR vulcanizates exhibited enhanced mechanical, AO, and AB properties, depending on the solvent type used in the organosolv process. The NR vulcanizates incorporated with L-Acetone showed dominant aging properties and AB efficacy. On the other hand, the tensile strength and elongation at break of the NR composites were significantly improved by L-IPA and L-Ethanol. These results suggest that SCL organosolv lignin, particularly L-IPA, could be an excellent alternative bio-filler for enhancing the mechanical, AO, and AB properties of NR composites.

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甘蔗叶衍生有机溶胶木质素作为天然橡胶复合材料的抗菌剂和抗氧化剂

为了提高天然橡胶（NR）衍生产品的可持续性和碳中和，将从甘蔗叶（SCL）中提取的木质素与 NR 结合，制备出环境友好型抗菌（AB）和抗氧化（AO）木质素/NR 复合材料。在这项研究中，SCL 木质素是在不同温度（140 - 180 °C）和使用不同有机溶剂（乙醇、丙酮和异丙醇 (IPA)）下通过有机溶胶工艺分离出来的。碟片扩散药敏试验、最低抑菌浓度（MIC）和最低杀菌浓度（MBC）表明，与革兰氏阴性菌（大肠杆菌和鼠伤寒杆菌）相比，SCL 有机溶胶木质素对革兰氏阳性菌（金黄色葡萄球菌）具有 AB 效应。溶剂的选择会逐渐影响木质素的 AB 和 AO 性能。Py-GC/MS 分析表明，SCL 有机溶胶木质素主要由对羟基苯基（H'）和愈创木酰（G'）组成，少量存在丁香基（S'）木质素。将 SCL 有机溶胶木质素掺入 NR 后发现，NR 硫化物的机械性能、AO 性能和 AB 性能均有所提高，具体取决于有机溶胶工艺中使用的溶剂类型。加入 L-Acetone 的 NR 硫化物具有显著的老化性能和 AB 效能。另一方面，L-IPA 和 L-乙醇显著提高了 NR 复合材料的拉伸强度和断裂伸长率。这些结果表明，SCL 有机溶胶木质素，尤其是 L-IPA，可以作为一种极佳的替代生物填料，用于增强 NR 复合材料的机械、AO 和 AB 性能。

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来源期刊

Cleaner Materials

CiteScore

9.20

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0.00%

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