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- W2004017411 abstract "Post-treatment with 2% H2O2–0.2% tetraacetylethylenediamine (TAED) at pH 11.8 for 12 h at 48 °C solubilized 27.1–28.1% of the original hemicelluloses and 43.3–46.2% of the original lignin from the ultrasound irradiated and alkali pre-treated wheat straw. It was found that the bleaching activator TAED forms peracetic acid with hydroperoxide anion in aqueous alkali and improves the brightness of the solubilized hemicelluloses. Xylose was a predominant sugar in all the hemicellulosic preparations, comprising 72.0–73.1% of the total sugars. Arabinose (13.4–13.9%) and glucose (6.7–7.9%) were detected as the second and third major neutral sugar constituents. In addition, the hemicelluloses also contained a noticeable amount of 4-O-methyl-d-glucuronic acid (6.0–7.0%) together with a small amount of galactose (4.3–4.9%) and minor quantities of rhamnose (1.5–1.8%) and mannose (0.5–0.8%). Furthermore, the hemicellulosic preparations obtained by TAED activated peroxide extraction showed a relatively lower content of associated lignin (3.8–4.4%), but a higher molecular weight (34,210–40,310 g mol−1). No significant differences in the structural features such as oxidation of the hemicelluloses by TAED were observed as compared to those obtained by alkaline peroxide without bleaching activator." @default.
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- W2004017411 date "2003-04-01" @default.
- W2004017411 modified "2023-10-18" @default.
- W2004017411 title "Characterization of hemicelluloses isolated with tetraacetylethylenediamine activated peroxide from ultrasound irradiated and alkali pre-treated wheat straw" @default.
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- W2004017411 doi "https://doi.org/10.1016/s0014-3057(02)00274-4" @default.
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