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“Also, tannic acid can be complexed and inactivated from its solution in in vitro conditions by polymers such as polyvinyl pyrrolidone (PVP) (Boudet, 1965), and polyoxyethylene sorbitan monoleate (Tween 80) (Zanobini et al., 1967).”
“Moreover, the use of polyvinylpyrrolidone as a blocking agent of tannins , did not change significantly the EC50 for branches extract, but significantly changed for leaves extract.”
“ Tannin inhibition was prevented and reversed by the detergent Triton X-100 (protein-binding agent), by soluble polyvinylpyrrolidone (tannin-binding agent), or by phosphatidylcholine (membrane component).”