Inclusion complex formation of cyclodextrin with its guest and their applications

Cyclodextrin (CD) are cyclic oligosaccharides consisting of glucopyranosyl units linked by α-(1,4) bonds. The widely used natural cyclodextrins are α-, βand γ-cyclodextrin consisting of 6, 7 and 8 glucopyranose units, respectively. The cyclodextrin molecules have a unique structure with a hydrophobic cavity and a hydrophilic surface which can form inclusion complex with a wide variety of guests. The use of cyclodextrins and their derivatives for the encapsulation of bioactive compounds can protect the compounds from environmental conditions and improve the aqueous solubility for increasing their capacity to functionalize the products. In some cases, there is a need to enhance water solubility of β-cyclodextrin by adding the hydroxyalkyl groups on the β-cyclodextrin surface. This review aimed to summarize the method for inclusion complex formation of cyclodextrin with its guests and its applications. Correspondence to: Prof. Benjamas Cheirsilp, Department of Industrial Biotechnology, Prince of Songkla University, Thailand; E-mail: [email protected]