Controlled Release of Tea Polyphenols from Calcium-crosslinked Pectin/Chitosan Complex Films
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Abstract:
Pectin/chitosan films and calcium-crosslinked pectin/chitosan complex films were prepared. The effect of different proportions on swelling ratio of films and the release rate of tea polyphenols from crosslinked films were investigated. The results indicated that the lowest swelling ratio of pectin/chitosan films was 9.5 after 2 h when the pectin-chitosan ratio was 1:0.5. The swelling ratio of calcium-crosslinked pectin/chitosan films varied with calcium content and the lowest one was only 2.1 after 6 h. The excess calcium caused increase of the swelling ratio. The controlled release rule of tea polyphenols from crosslinked films agreed with swelling ratio of the films and the release rate can be controlled by calcium content. The release rate decreased with increasing calcium crosslink level, but increased with excess calcium content. The release rate increased with increasing tea polyphenols contents. Tea polyphenols released faster in solution at pH 3 than that at pH 9.
