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| A novel adsorbent was prepared based on cattle hide collagen fibres. It was found that the collagen fibre adsorbent can selectively adsorb galloylated catechins (EGCG, GCG and ECG) from tea polyphenols (TP) with the extent of adsorption higher than 90%. The extent of adsorption for C, EGC and EC was relatively lower. In case of caffeine, the extent of adsorption was only 11.2%, imply that most of caffeine was left in residual solution. Eluted by acetone-water solution, the purified TP was obtained in which the total content of EGCG, GCG and ECG was 93.8% whilst the content of caffeine was decreased from 9.7% in original TP to 0.04%. The recovery rates of EGCG, GCG and ECG were higher than 80%. Further studies showed that the adsorption selectivity of hide collagen fibre adsorbent to the components of TP is related with their molecular structures. |
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| Keywords:collagen fibre adsorbent; adsorption; tea polyphenols (TP); caffeine; adsorption selectivity |
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