摘要:
O-acylated cephalosporins are produced by reacting 3-hydroxymethylcephalosporins with an acyl donor containing at least three carbon atoms and an enzyme which is a Rodosporidium toruloides esterase, a wheat germ lipase, an Aspergillus niger lipase, an orange peel acetylesterase or a Bacillus subtilis esterase. A preferred enzyme is the esterase from Rodosporidium toruloides ATCC 10657. The enzyme can be used while in whole cells or in soluble or inmobilized form.
摘要:
The present invention relates to a novel D-hydantoinase from Ochrobactrum anthropi that enantio-selectively hydrolyzes D-hydantoins to their corresponding D-N-carbamoyl-amino acids; nucleic acids that encode for the enzyme; expression vectors including the nucleic acids; and host cells capable of expressing the enzyme.
摘要:
Disclosed is a process for the synthesis of .beta.-lactam antibacterials using soluble side chain esters in the presence of enzyme acylase. Also disclosed are novel esters useful as reactants in said process.
摘要:
Disclosed is a process for the synthesis of .beta.-lactam antibacterials using soluble side chain esters in the presence of enzyme acylase. Also disclosed are novel esters useful as reactants in said process.
摘要:
The present invention is concerned with a chemical acetylation process for the preparation of 3'-acetylated cephalosporin from desacetyl-cephalosporin. The novel process is carried out with an acetyl donor and an activator or catalyst.
摘要:
Production of undesired desacetylcephalosporin C during fermentation of cephalosporin C-producing microorganisms is substantially reduced by addition of certain phosphorous compounds to the culture medium.