Toray Industries, Inc.

Hiroko Ishizuka

Katsushige Yamada

Hiroyuki Kurihara

Atsushi Minamino

A sugar liquid or solid sugar is derived from cellulose-containing biomass or blackstrap molasses, wherein content of one or more free amino acids selected from the group consisting of serine, threonine, asparagine, aspartic acid, glutamine, glutamic acid, proline, phenyl alanine, lysine, and histidine, which are impurities, is below the limit of detection.

Method of producing sugar liquid

A method of producing a sugar liquid from cellulose-containing biomass includes (1) to (3): (1): subjecting a cellulose-containing biomass to hydrothermal treatment and thereafter separating the treated cellulose-containing biomass into a hydrothermally-treated liquid and a cellulose-containing solid content; (2): adding a filamentous fungus-derived cellulase to the cellulose-containing solid content obtained in (1) to hydrolyze the cellulose and thereafter separating the hydrolysate into a saccharification residue and a sugar liquid; and (3): washing the saccharification residue obtained in (2) with the hydrothermally-treated liquid obtained in (1) to elute the filamentous fungus-derived cellulase adsorbed to the saccharification residue into the hydrothermally-treated liquid and thereafter obtaining a solution component comprising the filamentous fungus-derived cellulase by solid-liquid separation.

A method of producing a sugar liquid from biomass includes decomposing a fermentation inhibitor contained in a sugar aqueous solution obtained from biomass with a microorganism incapable of utilizing glucose and/or xylose or a crude enzyme derived from the microorganism, wherein the fermentation inhibitor includes one or more compounds selected from the group consisting of courmaric acid, coumaramide, ferulic acid, ferulamide, vanillin, vanillic acid, acetovanillone, furfural, and 3-hydroxymethylfurfural.

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Kamakura, Japan

Hiroko Ishizuka