Pacific Agri-Food Research Center, Agriculture and Agri-Food Canada, Summerland, BC, Canada.
Bioresour Technol. 2010 Oct;101(19):7446-55. doi: 10.1016/j.biortech.2010.04.086. Epub 2010 May 26.
High-molecular weight lignins (HML) and low-molecular weight lignins (LML) were extracted from flax shives using pressurized 30% aqueous ethanol, and isolated by precipitation and ultrafiltration. The isolated lignin samples and two commercial lignins were assayed for monolignol content and functional groups, solubility assays, thermal analysis using differential scanning calorimetry (DSC), size exclusion chromatography (SEC), and Fourier transform infrared spectroscopy (FT-IR). The highest yield of HML was 13.5 g/100 g of flax shives, and this was about six times higher than the LML yield. SEC of lignin samples revealed that the molecular weights of HML and LML are about 30,000 and 8749 Da, respectively. The DSC results of HML show that this lignin has a glass transition temperature near 160 degrees C. HML contains fewer carboxyl groups and more phenolic hydroxyl groups than LML. The higher molecular weight and higher thermal stability of HML makes it an excellent candidate for industrial applications.
采用加压 30%乙醇水溶液从亚麻屑中提取高分子量木质素（HML）和低分子量木质素（LML），并通过沉淀和超滤进行分离。对分离得到的木质素样品和两种商业木质素进行了愈创木基酚、紫丁香基酚和对羟苯基酚含量以及官能团、溶解度测定、差示扫描量热法（DSC）、尺寸排阻色谱（SEC）和傅里叶变换红外光谱（FT-IR）分析。HML 的最高得率为 13.5 g/100 g 亚麻屑，约为 LML 得率的 6 倍。木质素样品的 SEC 分析表明，HML 和 LML 的分子量分别约为 30000 和 8749 Da。HML 的 DSC 结果表明，该木质素的玻璃化转变温度接近 160°C。HML 中羧基含量较少，酚羟基含量较多。HML 具有较高的分子量和热稳定性，是工业应用的理想选择。
