Abstract:

Gardenia yellow is a physiologically active and edible nature pigment. Its usage, however, is limited due to its instable property. An inclusion complex of Gardenia yellow pigment with β-cyclodextrin was synthesized. UV, IR, fluorescence and NMR spectroscopy was used to confirm the formation of the inclusion complex and to determine the composition and the formation constant of the inclusion complex. The results show that β-cyclodextrin and Gardenia yellow pigment form a 1∶1 inclusion complex. This experiment will provide reference frame for the application of Gardenia yellow pigment.

Key words: NMR, Gardenia yellow, inclusion complex, spectroscopy