Immobilized tyrosinase reactor for on-line HPLC application. Development and characterization

Anna Maria Girelli, Enrico Mattei, Antonella Messina

Research output: Contribution to journalArticlepeer-review


Mushroom tyrosinase was covalently bonded with glutaraldehyde, as activating agent, to aminopropyl-controlled pore glass support by "in situ" immobilization technique. The Schiff's base double bond reduction with sodium cyanoborohydride was made as innovation. Catalytic activity and stability of the chromatographic reactor were evaluated using d,l-3,4-dihydroxyphenylalanine as substrate. The tyrosinase-IMER was characterized by investigation of various parameters influencing the enzymatic activity (pH, temperature, ionic strength and organic solvents). In addition kinetic measurements showed that, by removal of the external diffusional limitation, the enzyme selectivity towards substrate was improved whereas the activity was comparable with respect to that of free enzyme.

Original languageEnglish
Pages (from-to)515-521
Number of pages7
JournalSensors and Actuators, B: Chemical
Issue number2
Publication statusPublished - Feb 20 2007


  • HPLC
  • Immobilized enzyme
  • Kinetic parameters
  • Tyrosinase

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering


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