Department of Textile and Paper Engineering, Universitat Politècnica de Catalunya, Colom 11, E-08222 Terrassa, Spain.
Bioresour Technol. 2011 Jun;102(11):6554-61. doi: 10.1016/j.biortech.2011.03.068. Epub 2011 Mar 27.
The effects of 1-hydroxybenzotriazole (HBT) and the natural laccase mediators gallic acid, caffeic acid and p-hydroxybenzoic acid, on the enzymatic bleaching of flax pulp were compared. The treatment was performed under atmospheric air and oxygen pressure, and, for the first time, monitored by thermogravimetric analysis (TGA) for comparison with chemical analysis, FTIR and X-ray diffraction (XRD) spectroscopies. Thermogravimetric data were simulated by applying a nucleation kinetic equation to a combustion model based on four pseudo-components (hemicellulose, amorphous and crystalline cellulose, and lignin). The results thus obtained show that the effects of the natural mediators are similar to those of HBT and lead to increased order in cellulose microfibril surfaces. An increase in pulp crystallinity was additionally exposed by the XRD and FTIR techniques, and a reduction in microfibril equatorial size by the XRD patterns. Simulated DTG curves were used to determine the kinetic parameters for thermal degradation.
比较了 1-羟基苯并三唑（HBT）和天然漆酶介体没食子酸、咖啡酸和对羟基苯甲酸对亚麻浆酶漂白的影响。在大气压力和氧气压力下进行处理，并首次通过热重分析（TGA）进行监测，以便与化学分析、傅里叶变换红外光谱（FTIR）和 X 射线衍射（XRD）光谱进行比较。通过将成核动力学方程应用于基于四个拟组分（半纤维素、无定形和结晶纤维素以及木质素）的燃烧模型，对热重数据进行了模拟。所得结果表明，天然介体的作用与 HBT 相似，导致纤维素微原纤维表面有序性增加。XRD 和 FTIR 技术进一步揭示了纸浆结晶度的增加，XRD 图谱显示微原纤维赤道尺寸减小。模拟的 DTG 曲线用于确定热降解的动力学参数。
