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环糊精二聚体的分子动力学模拟与自由能计算 被引量:3

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摘要 采用分子动力学方法模拟了天然α,β,γ-环糊精(cyclodextrin,CD)二聚体以及6-O-(4-hydroxybenzoyl)-β-CD(HB-β-CD)二聚体在真空和水溶液环境下的结构和相互作用.利用自由能微扰方法计算了三种取向二聚体的结合自由能,以判断其稳定性差异.结果表明,在真空中由于分子间氢键作用,3种天然CD均以大口端-大口端为优势稳定取向,在溶液中三种天然CD二聚体平衡后的结构受到水的影响发生了很大的变化,且稳定性降低,而两个HB-β-CD形成的相互包结的二聚体的结构变化不大.自由能计算的结果表明,无论在真空还是溶液中,由于包结作用HB-β-CD二聚体的小口端-小口端为明显的优势取向,且稳定性要远远大于天然β-CD二聚体.
机构地区 南开大学化学系
出处 《中国科学(B辑)》 CAS CSCD 北大核心 2008年第4期301-307,共7页 Science in China(Series B)
基金 国家自然科学基金(批准号:20573102) 教育部博士点基金(批准号:20050055001)资助项目
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