A method for producing a dry reagent composition includes preparing a reagent solution including a Good's buffer in a concentration of more than 2.5 mM, an ammonium salt, a drying protection agent, and a nucleic acid amplification enzyme, and drying the reagent solution. A method for suppressing a decrease in enzyme activity during drying includes adding a Good's buffer in a biochemical reagent comprising an ammonium salt and an enzyme prior to drying the enzyme.

A method for producing a dry reagent composition includes preparing a reagent solution including a Good's buffer in a concentration of more than 2.5 mM, an ammonium salt, a drying protection agent, and a nucleic acid amplification enzyme, and drying the reagent solution. A method for suppressing a decrease in enzyme activity during drying includes adding a Good's buffer in a biochemical reagent comprising an ammonium salt and an enzyme prior to drying the enzyme.

A method for producing a dry reagent composition includes preparing a reagent solution including a Good's buffer in a concentration of more than 2.5 mM, an ammonium salt, a drying protection agent, and a nucleic acid amplification enzyme, and drying the reagent solution. A method for suppressing a decrease in enzyme activity during drying includes adding a Good's buffer in a biochemical reagent comprising an ammonium salt and an enzyme prior to drying the enzyme.

A method for producing a dry reagent composition includes preparing a reagent solution including a Good's buffer in a concentration of more than 2.5 mM, an ammonium salt, a drying protection agent, and a nucleic acid amplification enzyme, and drying the reagent solution. A method for suppressing a decrease in enzyme activity during drying includes adding a Good's buffer in a biochemical reagent comprising an ammonium salt and an enzyme prior to drying the enzyme.