Preparation and characterization of hydroxypropyl-β-cyclodextrin inclusion complex of Eugenol: differential pulse voltammetry and 1H-NMR

DOI Web Site Web Site 参考文献33件
  • Garg Anuj
    Department of Pharmaceutics, Institute of Technology, Banaras Hindu University
  • Gupta Bhavna
    School of Materials Science and Technology, Institute of Technology, Banaras Hindu University
  • Prakash Rajiv
    School of Materials Science and Technology, Institute of Technology, Banaras Hindu University
  • Singh Sanjay
    Department of Pharmaceutics, Institute of Technology, Banaras Hindu University

書誌事項

タイトル別名
  • Preparation and Characterization of Hydroxypropyl-.BETA.-Cyclodextrin Inclusion Complex of Eugenol: Differential Pulse Voltammetry and 1H-NMR
  • Preparation and characterization of hydroxypropyl v cyclodextrin inclusion complex of Eugenol differential pulse voltammetry and 1H NMR

この論文をさがす

抄録

The objective of present investigation was to improve the solubility of Eugenol by preparing the inclusion complex of Eugenol with hydroxypropyl-β-cyclodextrin (Hp-β-CD) and characterize the prepared complex by using NMR and differential pulse voltammetry (DPV). Phase solubility curve was plotted using Hp-β-CD in ranging from 0—40 mM of Hp-β-CD and found to be linear. Therefore, inclusion complex was prepared in equimolar ratio of Eugenol and Hp-β-CD by lyophilization method. Fourier transform infrared spectroscopy (FT-IR), 1H-NMR and DPV were performed for Eugenol, Hp-β-CD and prepared inclusion complex of Eugenol. 2D (two dimensional) NMR was also performed for prepared inclusion complex. The proton of phenol moiety of Eugenol experienced a pronounced chemical shift variation in 1H-NMR. The positive sign of the variation for proton in 1H-NMR indicated that the proton was located near to an oxygen atom in the Hp-β-CD cavity and its magnitude showed a strong interaction between –OH proton of Eugenol and Hp-β-CD. 2D NMR confirms the interaction between phenolic group and hydrogen atoms of Hp-β-CD. A well defined anodic peak current corresponding to oxidation of Eugenol in non-encapsulated and Hp-β-CD-Eugenol inclusion complex in phosphate buffer (pH 6.8) was obtained at about 0.35 V and 0.40 V, respectively. The positive shift in oxidation potential indicated the formation of complex via hydrophobic interactions. The oxidant power of Eugenol was retained in complex form as indicated by DPV results. Thus, its oxidation dependent pharmacological property such as antimicrobial activity is not affected after complexation with Hp-β-CD. Thus, 1H-NMR, 2D-NMR and DPV techniques can be used as valuable tools to determine the mechanism of complexation and state of electrochemical active drug in inclusion complex.

収録刊行物

参考文献 (33)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ