LIQUID CHROMATOGRAPH

1 . A liquid chromatograph comprising:

a liquid feeding portion which feeds a mobile phase to a flow channel;

a sample injection portion which is provided downstream of the liquid feeding portion in the flow channel and injects a sample into the mobile phase;

a separation column which is provided downstream of the sample injection portion in the flow channel and separates sample components in the sample;

a first temperature adjustment device which raises temperature of the separation column to a first temperature during separation of the sample components by the separation column; and

a detector which is provided downstream of the separation column in the flow channel and detects sample components separated by the separation column,

wherein the liquid chromatograph further comprises

a second temperature adjustment device which is provided upstream of the separation column in the flow channel and adjusts temperature of the mobile phase to a second temperature lower than the first temperature; and

a control device which controls at least one of the liquid feeding portion and the second temperature adjustment device,

wherein the control device controls at least one of the liquid feeding portion and the second temperature adjustment device such that the mobile phase adjusted to the second temperature is fed to the separation column before a next sample is injected after separation of the sample components by the separation column ends.

2 . The liquid chromatograph according to claim 1 ,

wherein the liquid feeding portion includes a container storing the mobile phase, and

wherein the second temperature adjustment device is installed on the container.

3 . The liquid chromatograph according to claim 1 ,

wherein the liquid feeding portion includes a container storing the mobile phase and a pump feeding the mobile phase in the container to the flow channel, and

wherein the second temperature adjustment device is installed on the flow channel between the container and the pump.

4 . The liquid chromatograph according to any one of claim 1 ,

wherein the second temperature adjustment device is installed on the flow channel between the liquid feeding portion and the sample injection portion.

5 . The liquid chromatograph according to any one of claim 1 further comprising:

an ammonia filter column which is disposed on the flow channel between the liquid feeding portion and the sample injection portion,

wherein the second temperature adjustment device is installed on the ammonia filter column.

6 . The liquid chromatograph according to any one of claim 1 ,

wherein the second temperature adjustment device is installed on the flow channel between the sample injection portion and the separation column.

7 . The liquid chromatograph according to any one of claim 1 ,

wherein the mobile phase includes two or more kinds of eluents including a first eluent and a second eluent which starts to be fed for separation of a sample later than the first eluent, and

wherein the second temperature adjustment device adjusts temperature of the first eluent.

8 . The liquid chromatograph according to any one of claim 1 ,

wherein the mobile phase includes an adjustment liquid which is not used for separation of the sample, and

wherein the second temperature adjustment device adjusts temperature of the adjustment liquid.

9 . The liquid chromatograph according to any one of claim 1 ,

wherein the liquid chromatograph is an ion exchange chromatograph.

10 . The liquid chromatograph according to any one of claim 1 ,

wherein the liquid chromatograph is an amino acid analyzer for analyzing amino acids.