Abstract Oak wood sawdust (OWSD) was extracted under supercritical CO2 sequentially with petroleum, carbon disulfide (CDS), methanol, acetone, and isometric CDS/acetone mixture to afford extracts 1–5 (E1–E5), respectively. Then the extraction residue (RE) was subjected to sequential oxidation with aqueous hydrogen peroxide (AHPO)/acetic anhydride (AAH) at 65 °C to afford soluble portions 1–4 (SP1–SP4). In total, ca. 95.8% of organic matter in OWSD became soluble by the sequential extraction and oxidation. No significant difference in the distribution of functional groups was observed in Fourier transform infrared spectra of OWSD and RE, while the distribution of functional groups in the oxidation residue is significantly different from that in either OWSD or RE. In total, 117 and 168 compounds were detected in E1–E5 and SP1–SP4, respectively, with a gas chromatograph/mass spectrometer. E1–E5 are rich in esters, while carboxylic acids are abundant in SP1–SP4 in addition to esters. HO· released from AHPO/AAH played a crucial role in oxidatively degrading RE.

中文翻译：

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橡木锯末的顺序提取和提取残渣的氧化降解

摘要 橡木锯末 (OWSD) 在超临界 CO2 下依次用石油、二硫化碳 (CDS)、甲醇、丙酮和等量 CDS/丙酮混合物提取，分别得到提取物 1-5 (E1-E5)。然后在 65°C 下用过氧化氢 (AHPO)/乙酸酐 (AAH) 对提取残留物 (RE) 进行顺序氧化，得到可溶部分 1-4 (SP1-SP4)。总共，大约。OWSD 中 95.8% 的有机物通过连续提取和氧化变得可溶。在OWSD和RE的傅里叶变换红外光谱中没有观察到官能团分布的显着差异，而氧化残渣中的官能团分布与OWSD或RE中的官能团分布存在显着差异。总共在 E1-E5 和 SP1-SP4 中分别检测到 117 和 168 种化合物，用气相色谱仪/质谱仪。E1-E5 富含酯类，而除酯类外，SP1-SP4 中还含有丰富的羧酸。AHPO/AAH 释放的 HO· 在氧化降解 RE 中起关键作用。