Nucleic acid sensor for melamine analysis, device for melamine analysis, and method for melamine analysis

A nucleic acid sensor for melamine analysis comprising:

• the following polynucleotide (x1), (x2), (x3), or (x4) that includes a catalytic nucleic acid molecule (D) that activates a catalytic function and a binding nucleic acid molecule (A) that binds to melamine:
• (x1) a polynucleotide consisting of any one of base sequences of SEQ ID NOs:
• 1 to 14, wherein n and m are positive integers;
• (x2) a polynucleotide consisting of a base sequence obtained by substitution, deletion, addition, and/or insertion of one or more bases in the base sequence of the polynucleotide (x1), wherein a catalytic function of the catalytic nucleic acid molecule (D) is inhibited in the absence of melamine and the catalytic function of the catalytic nucleic acid molecule (D) is activated in the presence of melamine;
• (x3) a polynucleotide consisting of a base sequence having at least 80% identity to any base sequence of the polynucleotide (x1), wherein the catalytic function of the catalytic nucleic acid molecule (D) is inhibited in the absence of melamine and the catalytic function of the catalytic nucleic acid molecule (D) is activated in the presence of melamine;
• and
• (x4) a polynucleotide consisting of a base sequence complementary to a polynucleotide that hybridizes to a polynucleotide consisting of any base sequence of the polynucleotide (x1) under a stringent condition, wherein the catalytic function of the catalytic nucleic acid molecule (D) is inhibited in the absence of melamine and the catalytic function of the catalytic nucleic acid molecule (D) is activated in the presence of melamine.