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Chlorogenic acid (CGA) is a polyphenol commonly existed in fruits and
vegetables with a variety of bioactivities. To increase its stability and
potential broader industrial application, CGA/cyclodextrin (CD) complexes
were prepared using @b-cyclodextrin (@b-CD) and its derivative
(2-hydroxypropyl)-@b-cyclodextrin (2-HP-@b-CD). Their inclusion
complexation behavior and characterization were investigated by FT-IR, XRD,
SEM, and ^1H NMR spectroscopy. The morphologic and spectral studies
indicated the formation of inclusion complexes. Moreover, spatial
arrangements of inclusion complexes were proposed based on ^1H NMR results.
The antioxidant activities of the complexes were improved compared with the
CGA without inclusion, and the CGA/HP-@b-CD complexes showed the highest
antioxidant activity. In addition, the CGA/CD complexes were added in grape
juice to explore the potential on the preservation of anthocyanin and color
quality. Results showed that the degradation of anthocyanins was reduced
when CGA and CGA/CDs inclusions were added in grape juice due to
copigmentation effect, and their copigmentation strength showed in an order
of CGA/HP-@b-CD complex > CGA/@b-CD complex > free CGA.
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