Thitinun KarpkirdSupason WanichweacharungruangMahidol University2018-09-242018-09-242010-04-30Journal of Photochemistry and Photobiology A: Chemistry. Vol.212, No.1 (2010), 56-61101060302-s2.0-77951666067https://repository.li.mahidol.ac.th/handle/20.500.14594/28898Various cyclodextrins, alpha, beta and gamma, were esterified with 4-methoxy-, 2,4,5- and 2,4,6-trimethoxycinnamic acids. Upon esterification with β-cyclodextrin, the photostability of 2,4,5-trimethoxycinnamate increased while no improvement was observed for 4-methoxycinnamate and 2,4,6-trimethoxycinnamate. However, increase in the photostability of 4-methoxycinnamoyl moiety could be observed when esterified with α-CD and that of 2,4,6-trimethoxycinnamoyl moiety could be observed after being esterified with γ-CD. These photostability data together with the 2D NMR analyses indicated that the 4-methoxycinnamoyl, 2,4,5-trimethoxycinnamoyl and 2,4,6-trimethoxy cinnamoyl moieties could enter the α-CD, the β-CD, and the γ-CD cavities, respectively. © 2010 Elsevier B.V. All rights reserved.Mahidol UniversityChemical EngineeringChemistryPhysics and AstronomyArticleSCOPUS10.1016/j.jphotochem.2010.03.016