Abstract
The models of rat everted gut sac and hydrolysis by rat plasma were used to clarify the hydrolysis and transport characteristics of tyrosol-SCFA esters (TYr-SEs). HPLC-UV results indicated that TYr-SEs could be hydrolyzed by intestinal lipase, which showed sustained release of SCFAs and TYr. Meanwhile, TYr-SEs and the liberated SCFAs and TYr could cross the membrane and were transported into blood circulation. TYr-SEs were further hydrolyzed by carboxylesterase in plasma. Obviously, the hydrolysis of TYr-SEs in blood also showed sustained release of SCFAs and TYr. Especially, the rates of hydrolysis and transport correlated positively with the acyl chain lengths. Besides, the above rates of the TYr-SE with a straight chain were greater than those of its isomer with a branched chain. Therefore, the above-mentioned two-step release of SCFAs and TYr clearly demonstrated that TYr-SEs would be an effective approach to enhance the beneficial health effects of SCFAs and TYr.
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