Patent ID: 8017379

Claim:
A nucleic acid purification instrument for purifying nucleic acids of interest from a liquid sample containing nucleic acids, comprising a nucleic acid capturing column having a nucleic-acid-adsorptive solid phase and a pressurizing unit for pressurizing a liquid supplied to the nucleic acid capturing column such that the liquid is allowed to pass through the nucleic-acid-adsorptive solid phase so as to be discharged from the nucleic acid capturing column, such instrument further comprising: a liquid accommodating tank that is connected to a liquid discharge opening of the nucleic acid capturing column and accommodates the liquid discharged from the nucleic acid capturing column; a capturing unit for capturing floating liquid components mixed with the air in the liquid accommodating tank, the capturing unit including a protection filter located on a sidewall of the liquid accumulating tank; a ventilation unit for supplying air in a manner such that the floating liquid components mixed with air in the liquid accommodating tank flow toward the capturing unit; and a partition board located at a position facing the protection filter, wherein the partition board extends to a vertical direction to lead liquid discharged from the nucleic acid capturing column to the lower part of the liquid accommodating tank.