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首页> 外文期刊>RSC Advances >Ferricyanide-based analysis of aqueous lignin suspension revealed sequestration of water-soluble lignin moieties
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Ferricyanide-based analysis of aqueous lignin suspension revealed sequestration of water-soluble lignin moieties

机译：基于铁氰化物的木质素水悬浮液分析显示，水溶性木质素部分被隔离

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This study describes the application of a ferricyanide-based assay as a simple and inexpensive assay for rapid analysis of aqueous lignin samples. The assay measures the formation of Prussian blue from the redox reaction between a mixture of potassium ferricyanide and ferric chloride, and phenolic hydroxyl groups of lignin or lignin-derived phenolic moieties. This study revealed that soluble lignin moieties exhibited stronger ferricyanide reactivity than insoluble aggregates. The soluble lignin moieties exhibited higher ferricyanide reactivity because of increased access of the phenolic hydroxyl groups to the ferricyanide reagents. Ferricyanide reactivity of soluble lignin moieties correlated inversely with the molecular weight distributions of the molecules, probably due to the involvement of phenolic hydroxyl groups in bond formation. The insoluble lignin aggregates exhibited low ferricyanide reactivity due to sequestration of the phenolic hydroxyl groups within the solid matrix. The study also highlighted the sequestration of polydispersed water-soluble lignin moieties by insoluble aggregates. The sequestered moieties were released by treatment with 0.01 M NaOH at 37 degrees C for 180 min. The redox assay was effective on different types of lignin extracts such as Klason lignin from switchgrass, ionic-liquid derived lignin from Eucalyptus and alkali lignin extracts. The assay generated a distinct profile for each lignin sample that was highly reproducible. The assay was also used to monitor consumption of syringic acid by Sphingobium sp. SYK-6. The simplicity and reproducibility of this assay makes it an excellent and versatile tool for qualitative and semi-quantitative characterization and comparative profiling of aqueous lignin samples.
机译：这项研究描述了基于铁氰化物的分析方法作为一种简单且廉价的分析方法，可用于快速分析含水木质素样品。该测定法测量了由铁氰化钾和氯化铁的混合物与木质素或木质素衍生的酚基部分的酚羟基之间的氧化还原反应形成的普鲁士蓝。这项研究表明，可溶性木质素部分比不溶性聚集体具有更强的铁氰化物反应性。可溶性木质素部分表现出较高的铁氰化物反应性，因为酚羟基对铁氰化物试剂的进入增加。可溶性木质素部分的铁氰化物反应性与分子的分子量分布成反比，这可能是由于酚羟基参与了键的形成。由于不溶性木质素聚集体固着固体基质中的酚羟基，因此显示出低的铁氰化物反应性。该研究还强调了不溶性聚集体对多分散水溶性木质素部分的隔离。通过在37℃下用0.01M NaOH处理180分钟来释放隔离的部分。氧化还原法对不同类型的木质素提取物（例如柳枝from的Klason木质素，来自桉树的离子液体衍生的木质素和碱性木质素提取物）有效。该测定法为每个木质素样品生成了高度可重复的独特曲线。该测定法还用于监测鞘氨醇单孢菌属（Sphingobium sp）对丁香酸的消耗。 SYK-6。该测定法的简单性和可重复性使其成为水性木素样品定性和半定量表征和比较分析的出色且通用的工具。

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