| 多溴联苯醚好氧生物降解研究 |
| 摘要点击 2236 全文点击 1556 投稿时间：2007-11-13 修订日期：2008-01-21 |
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| 中文关键词 多溴联苯醚 白腐菌 Tween 80 β-环糊精 生物降解 |
| 英文关键词 polybrominated diphenyl ethers (PBDEs) white rot fungi Tween 80 β-cyclodextrin biodegradation |
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| 中文摘要 |
| 研究了好氧真菌白腐菌对4, 4′-二溴联苯醚（BDE15）和十溴联苯醚(BDE209)的降解，并考察了不同浓度Tween 80和β-环糊精的加入对BDE15和BDE209表观溶解度和生物降解的影响.结果表明，白腐菌对BDE209和BDE15均有显著降解作用，培养10 d后，BDE209的降解率达到43.0％，降解了约69.7 μg，BDE15则由150 μg降至4.8 μg，扣除其挥发损失，降解率达62.5％.低浓度Tween 80(≤700 mg/L)和β-环糊精对白腐菌降解BDE209均有明显的促进作用，而高浓度的Tween 80（900 mg/L）则会抑制白腐菌生长，从而抑制其降解作用.Tween 80和β-环糊精（500 mg/L）对BDE15的降解均有一定抑制作用.Tween 80和β-环糊精对BDE209降解的促进作用主要是由于其对BDE209的增溶作用，对BDE15的抑制作用可能是由于Tween 80胶束和β-环糊精空腔对BDE15的包裹降低了水中可直接利用的自由态BDE15，影响了降解速度. |
| 英文摘要 |
| The biodegradation of 4, 4′-dibromodipheny ether (BDE15) and decabromodiphenyl ether (BDE209) by white rot fungi under aerobic conditions was studied. Effects of non-ionic surfactant Tween 80 and β-cyclodextrin as solubilizers on the apparent solubilities and biodegradation rates of BDE15 and BDE209 were also evaluated. The results showed that both BDE15 and BDE209 were efficiently degraded by white rot fungi. The degradation rates were 43.0% and 62.5% for BDE209 and BDE15, respectively, after 10 d incubation. The degradation of BDE209 was greatly enhanced by addition of Tween 80 (≤700 mg/L) and β-cyclodextrin, which may own to their solubilization effects on BDE209. However, Tween 80 at a high concentration (900 mg/L) would restrain the fungal growth, thereby decrease the degradation of BDE209. Addition of Tween 80 and β-cyclodextrin exhibited some negative effects on the degradation of BDE15, which may due to decreased concentration of free BDE15 in water solution resulted from inclusion function of Tween 80 micelles and β-cyclodextrin cavity, although the apparent solubility of BDE15 was drastically increased by both of them. |
