Studies have indicated that piperine is absorbed very quickly across the intestinal barrier. It exhibited passive diffusion with nonsaturable absorption kinetics, short absorption clearance and a high permeability coefficient (Khajuria et al. 1998). It is, therefore, reasonable to presume that since piperine is an apolar mo lecule, it may modulate membrane dynamics due to its easy partitioning in the hydrophobic core and assist easy permeation of solutes. The available research data point out that piperine increases bioavailability of drugs either by promoting rapid absorption from the astrointestinal tract, or by retarding the drug from being metabolized in the liver or by a combination of these two mechanisms.
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