Chem. J. Chinese Universities ›› 2011, Vol. 32 ›› Issue (11): 2544.

• Articles • Previous Articles     Next Articles

Inclusion Interactions of Cucurbit[8]uril with Methotrexate

MA Yan-Hui1, HUANG Ying2, ZHU Qian-Jiang1*, ZHANG Jian-Xin3, XUE Sai-Feng1, TAO Zhu1   

  1. 1. Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province,
    2.  Engineering and Research Center for Southwest Bio\|Pharmaceutical Resources of  Ministry of Education, 
    3.   Key Laboratory of Chemistry for Nature Products of Guizhou Province and Chinese  Academy of Sciences,   Guizhou University,  Guiyang 550025,  China
  • Received:2011-01-11 Revised:2011-05-24 Online:2011-11-10 Published:2011-10-14
  • Contact: ZHU Qian-Jiang E-mail:gzuzhuqj@163.net
  • Supported by:

    国家自然科学基金(批准号: 20972034), 贵州省科技厅自然科学基金(批准号:  黔科合J字[2009]2288号), 贵州省教育厅自然科学研究项目(批准号: 黔教科2010013号)和贵州大学人才引进项目[批准号: 贵大人基合字(2009)023号]资助.

Abstract: Cucurbit[n]urils(Q[n]) which have the unique structure with hydrophobic central cavity and hydrophilic carbonyl group portals, are a class of molecular containers that bind to a variety of cationic and neutral species with high affinity and therefore show great promise as a drug delivery system.  In this paper, interactions of cucurbit[8]uril(Q[8]) with anti-cancer drug MTX in different proton forms were studied in details by UV absorption spectroscopy.  The result shows that the inclusion ratio of Q[8] and MTX+ is 1:1,  and the formation constant is (7.64±1.52)×104 L/mol.  Moreover, the thermodynamic parameters of the complex formation were also determined, and it shows that the formation of the inclusion complexes between MTX and Q[8] is entropy controlled, suggesting that hydrophobic forces are the main driving forces.  The inclusion complex was further proved by 1H NMR.

Key words: Cucurbit[8]uril, Methotrexate, Ultraviolet absorption spectroscopy, Thermodynamic stability

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