Abstract: A packaged lactase solution that prevents clogging of a filter. A lactase solution is present in a container, in which a head space volume in the container is controlled to 20% or less relative to the total volume of the container. The packaged lactase solution is a lactase activity within the range of 10-100,000 NLU/g. The packaged lactase solution is substantially transparent. the temperature of the lactase solution and the temperature of the container are above 0° C. and 20° C. or lower. The material of the container is polyethylene, polypropylene, polystyrene, polyvinyl acetate, polyurethane, polyurethane, polytetrafluoroethylene, or acrylonitrile butadiene styrene resin.

Abstract: Provided are a novel isoamylase improved in optimum temperature, and more specifically, improved in heat resistance, and a process for producing the isoamylase. An isoamylase having at least one amino acid mutation selected from the group consisting of D268A, M277I, A549P, A554P and A580T in an isoamylase consisting of an amino acid sequence represented by SEQ ID No: 1 or an isoamylase consisting of the amino acid sequence represented by SEQ ID No: 1 and having deletion, substitution or insertion of one to several amino acid residues.

Abstract: Provided are a novel isoamylase improved in optimum temperature, and more specifically, improved in heat resistance, and a process for producing the isoamylase. An isoamylase having at least one amino acid mutation selected from the group consisting of D268A, M277I, A549P, A554P and A580T in an isoamylase consisting of an amino acid sequence represented by SEQ ID No: 1 or an isoamylase consisting of the amino acid sequence represented by SEQ ID No: 1 and having deletion, substitution or insertion of one to several amino acid residues.