title: Polyvinyl alcohol--trypsin as a catalyst for amino acid ester synthesis in organic media.
abstract: The bovine trypsin-catalyzed synthesis of N-alpha-benzoyl-DL-arginine esters from N-benzoyl-DL-arginine were studied in various organic solvents. Trypsin was immobilized to polyvinyl alcohol (PVA) by adsorption from its aqueous solutions. Immobilized enzyme showed higher catalytic activities than free enzyme for amino acid esterification in ethanol. The yield of ester is strongly dependent upon the PVA/trypsin ratio and water content in the reaction medium. The rate and equilibrium constant of the ester formation reaction are also dependent on water content.
authors.affiliation: Department of Chemistry, Trakya University, Edirne, Turkey. yesimyesiloglu@trakya.edu.tr
authors.forename: Yesim
authors.initials: Y
authors.lastname: Yesiloglu
authors.forename: Ismail
authors.initials: I
authors.lastname: Kilic
mesh_terms: D000327:Adsorption; D000596:Amino Acids / Q000138:chemical synthesis; D000818:Animals; D001120:Arginine / Q000138:chemical synthesis*; D002384:Catalysis; D002417:Cattle; D004800:Enzymes, Immobilized / Q000737:chemistry; D004952:Esters; D009930:Organic Chemicals / Q000737:chemistry*; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry*; D014357:Trypsin / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D000596:Amino Acids; D004800:Enzymes, Immobilized; D004952:Esters; D009930:Organic Chemicals; D012997:Solvents; D014867:Water; D011142:Polyvinyl Alcohol; D001120:Arginine; D014357:Trypsin