title: The effect of some environmental factors on the production of L-DOPA by alginate-entrapped cells of Mucuna pruriens.
abstract: In-vitro-grown cells of Mucuna pruriens, immobilized in calcium-alginate gels, were able to transform the precursor L-tyrosine into L-dihydroxyphenylalanine (L-DOPA). After the immobilization in alginate the plant cells released 90% of the produced L-DOPA into the medium; supplementation of the medium with calcium inhibited both the transformation of L-tyrosine into L-DOPA and the release of L-DOPA into the medium. Continuous illumination of the beads had a slight beneficial effect on the synthesis of L-DOPA. A simple production medium for the transformation of L-tyrosine into L-DOPA was designed. This medium contained only sucrose and sodium chloride as osmotic stabilizers, a low concentration of calcium chloride for stabilization of the alginate beads, and L-tyrosine as the precursor.
authors.affiliation: Laboratory of Pharmacognosy and Galenic Pharmacy, Antonius Deusinglaan 2, NL-9713 AW, Groningen, The Netherlands.
authors.forename: H J
authors.initials: HJ
authors.lastname: Wichers
authors.forename: T M
authors.initials: TM
authors.lastname: Malingré
authors.forename: H J
authors.initials: HJ
authors.lastname: Huizing