Enzyme preparation having affinity for water-immiscible liquids
First Claim
1. In an enzyme preparation having an enzyme portion and a polymeric support in which the enzyme portion is covalently bound directly to the polymeric support or is covalently bound to an inert bridging group which bridging group is in turn covalently bound to said polymeric support, the improvement which comprises the presence of a plurality of hydrophobic groups covalently bound to either or both of said enzyme portion and said polymeric support, said hydrophobic groups being hydrophobic at least by reason of a free terminal non-polar hydrocarbon portion of six or more carbon atoms, and being present in said enzyme preparation in such proportion as to impart, without deactivation of the enzyme portion, sufficient overall hydrophobic properties to said enzyme preparation to permit separation of the preparation from aqueous media through preferential association with an inert water-immiscible organic liquid.
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Abstract
An enzyme preparation is prepared having terminal non-polar groups incorporated therein so that the enzyme preparation has affinity for a water-immiscible liquid. The enzyme preparation can be separated from an aqueous reaction mixture by contacting the mixture with the water-immiscible liquid, permitting the enzyme preparation to become associated with the water-immiscible liquid and separating the water-immiscible liquid containing the associated enzyme from the reaction mixture.
15 Citations
27 Claims
- 1. In an enzyme preparation having an enzyme portion and a polymeric support in which the enzyme portion is covalently bound directly to the polymeric support or is covalently bound to an inert bridging group which bridging group is in turn covalently bound to said polymeric support, the improvement which comprises the presence of a plurality of hydrophobic groups covalently bound to either or both of said enzyme portion and said polymeric support, said hydrophobic groups being hydrophobic at least by reason of a free terminal non-polar hydrocarbon portion of six or more carbon atoms, and being present in said enzyme preparation in such proportion as to impart, without deactivation of the enzyme portion, sufficient overall hydrophobic properties to said enzyme preparation to permit separation of the preparation from aqueous media through preferential association with an inert water-immiscible organic liquid.
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15. An enzyme preparation consisting essentially of an enzyme covalently bound directly to a plurality of hydrophobic groups, said hydrophobic groups being hydrophobic at least by reason of a free terminal non-polar hydrocarbon portion of six or more carbon atoms, and being present in said enzyme preparation in such proportion as to impart, without deactivation of the enzyme, sufficient overall hydrophobic properties to said enzyme preparation to permit separation of the preparation from aqueous media through preferential association with an inert water-immiscible organic liquid.
- 16. The process for the preparation of an enzyme preparation having an enzyme portion and a polymeric support in which the enzyme portion is covalently bound directly to the polymeric support or is covalently bound to an inert bridging group which bridging group is in turn covalently bound to said polymeric support said preparation further having a plurality of hydrophobic groups covalently bound to said polymeric support, said hydrophobic groups being hydrophobic at least by reason of a free terminal non-polar hydrocarbon portion of six or more carbon atoms, and being present in said enzyme preparation in such proportion as to impart, without deactivation of the enzyme portion, sufficient overall hydrophobic properties to said enzyme preparation to permit separation of the preparation from aqueous media through preferential association with an inert water-immiscible organic liquid, which process comprises chemically joining an enzyme or an activated derivative thereof (a) with a polymeric support having pendant functional groups capable of covalently reacting with said enzyme or activated derivative thereof and to which support has also been covalently bound said terminal hydrophobic groups or (b) with a polymeric support to which both said terminal hydrophobic groups and said bridging groups have been covalently bound, said bridging groups having terminal functional groups capable of covalently reacting with said enzyme or activated derivative thereof.
- 21. In an enzymic reaction wherein an enzyme preparation is contacted, in aqueous medium, with a substrate for said enzyme, the enzyme preparation is separated from the reaction mixture and the reaction product is recovered, the improvement permitting re-use of the separated enzyme preparation which comprises utilizing an enzyme preparation having an enzyme portion, a polymeric support said enzyme portion being covalently bound directly to the polymeric support or covalently bound to an inert bridging group which bridging group is in turn covalently bound to said polymeric support, and a plurality of hydrophobic groups covalently bound to either or both of said enzyme portion and said polymeric support, said hydrophobic groups being hydrophobic at least by reason of a free terminal non-polar hydrocarbon portion of six or more carbon atoms, and being present in said enzyme preparation in such proportion as to impart, without deactivation of the enzyme portion, sufficient overall hydrophobic properties to said enzyme preparation to permit separation of the preparation from aqueous media through preferential association with an inert water-immiscible organic liquid.
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27. A process for the preparation of 6-amino-penicillanic acid from benzylpenicillin, which process comprises contacting benzylpenicillin in aqueous medium with an inert water-immiscible organic liquid and an enzyme preparation comprising penicillin acylase covalently attached to a plurality of free terminal non-polar groups in such proportion as to impart to the preparation sufficient overall hydrophobic properties to cause preferential association with said inert water-immiscible organic liquid, thereafter allowing the aqueous and water-immiscible layers to separate, separating said water-immiscible layer and the associated enzyme preparation from the aqueous reaction mixture, and recovering the 6-aminopenicillanic acid from the aqueous layer.
Specification