Detection instrument, and detection system

1. A detection method using a detection instrument, the detection instrument comprising:

a detection portion, wherein

a detection reagent which develops a color by specifically reacting with a detection object in a sample is placed in the detection portion,

positional information of the detection reagent in the detection portion is information on the detection object,

color development of the detection reagent can be optically read, and

a bar code is formed in the detection portion, and

wherein at least one of the following conditions is met:

Condition (I): the detection reagent is placed on one to four positions of the barcode as a part of the bar code; and

Condition (II): besides the bar code, the detection reagent is placed either on a part of or on the entire bar code, and the part of or the entire bar code is indistinguishable by color development of the detection reagent.

2. The method according to claim 1 , wherein

the detection reagent comprises a nucleic acid element,

the nucleic acid element comprises a first nucleic acid portion and a second nucleic acid portion,

the first nucleic acid portion is a binding portion which can bind to the detection object,

the second nucleic acid portion is a labeling portion which can distinguish between binding and non-binding of the first nucleic acid portion and the detection object, and

the labeling portion can cause the detection reagent to or not to develop a color according to the distinguishing between the binding and non-binding.

3. The method according to claim 2 , wherein

the detection reagent comprises a labeling substance,

when the detection object does not bind to the first nucleic acid portion, the second nucleic acid portion can bind to the labeling substance, and

when the detection object binds to the first nucleic acid portion, the second nucleic acid portion cannot bind to the labeling substance.

4. The method according to claim 3 , wherein

a secondary structure of the second nucleic acid portion changes by binding of the detection object to the first nucleic acid portion, and

the labeling substance binding to the second nucleic acid portion is released from the second nucleic acid portion by the change of the secondary structure.

5. The method according to claim 4 , wherein

the labeling substance is an enzyme,

the detection reagent contains a chromogenic substrate which develops a color by an enzyme reaction with the enzyme,

when the enzyme binds to the second nucleic acid portion, the enzyme reaction with the enzyme is inhibited, and

when the enzyme is released from the second nucleic acid portion, the enzyme reaction is released from being inhibited.

6. The method according to claim 2 , wherein

the second nucleic acid portion can cause an enzyme reaction,

the detection reagent comprises a chromogenic substrate which develops a color by an enzyme reaction with the second nucleic acid portion,

when the detection object does not bind to the first nucleic acid portion, the enzyme reaction with the second nucleic acid portion is inhibited, and

when the detection object binds to the first nucleic acid portion, the enzyme reaction is released from being inhibited.

7. The method according to claim 2 , wherein

the first nucleic acid portion and the second nucleic acid portion are a single-stranded nucleic acid obtained by linking to each other.

8. The method according to claims 2 , wherein

the nucleic acid is RNA.

9. The method according to claims 2 , wherein

the first nucleic acid portion and the second nucleic acid portion are aptamers.

10. The method according to claim 1 , wherein

a positive control which can be read optically is placed in the detection portion.