The invention relates to immobilized enzyme compositions for the preparation of a hexose. Hexoses include, for example, tagatose, psicose, fructose, allose, mannose, galactose, altrose, talose, sorbose, gulose, idose, and inositol. The invention also relates to an enzymatic process for preparing a hexose from a saccharide by contacting a starch derivative with an immobilized enzyme composition of the invention.

Provided are a composition for producing tagatose, comprising fructose-4-epimerase, and a method of producing tagatose using the same.

The present disclosure relates to a composition for producing tagatose comprising a protein having fructose-4-epimerase activity and a method for producing tagatose using the same.

Provided are a tagatose-bisphosphate aldolase variant having tagatose conversion activity, and a method of preparing tagatose using the same.

The present disclosure relates to a composition for producing tagatose, comprising fructose-6-phosphate-4-epimerase, and a method of producing tagatose using the same.

The present disclosure relates to a composition for producing tagatose comprising a protein having fructose-4-epimerase activity and a method for producing tagatose using the same.

The present invention relates to a method for preparing phosphorylated keto polyols by biocatalysis and uses thereof.

The present invention relates to a recombinant strain having a modified sugar metabolic pathway resulting from the introduction of an enzyme derived from a different strain to a strain, and a high-speed screening method for various mutants and variants by which useful materials can be obtained or which can produce useful materials. The use of a recombinant vector and a strain according to the present invention not only can construct a new metabolic pathway in a strain to effectively obtain D-tagatose from D-galactose, but also can introduce randomly modified sugar isomerases and then allow D-galactose isomerase variants to be rapidly screened by conducting a cell growth-associated screening system.

Provided are a composition for producing tagatose, comprising fructose-4-epimerase, and a method of producing tagatose using the same.

The present invention provides a genetically modified lactic acid bacterium capable of producing diacetyl under aerobic conditions. Additionally the invention provides a method for producing diacetyl using the genetically modified lactic acid bacterium under aerobic conditions in the presence of a source of iron-containing porphyrin and a metal ion selected from Fe.sup.3+, Fe.sup.2+ and Cu.sup.2+. The lactic acid bacterium is genetically modified by deletion of those genes in its genome that encode polypeptides having lactate dehydrogenase (E.C 1.1.1.27/E.C.1.1.1.28); -acetolactate decarboxylase (E.C 4.1.1.5); water-forming NADH oxidase (E.C. 1.6.3.4); phosphotransacetylase (E.C.2.3.1.8) activity; and optionally devoid of or deleted for genes encoding polypeptides having diacetyl reductase ((R)-acetoin forming; EC:1.1.1.303); D-acetoin reductase; butanediol dehydrogenase ((R,R)-butane-2,3-diol forming; E.C. 1.1.1.4/1.1.1.-) and alcohol dehydrogenase (E.C. 1.2.1.10) activity. The invention provides for use of the genetically modified lactic acid bacterium for the production of diacetyl and a food product.