Granulocyte adsorbent

1. A granulocyte adsorbent comprising a polymer compound having an unsubstituted hydroxyl group and a hydroxyl group in which H has been substituted with acetyl, wherein the polymer compound is at least one selected from

cellulose acetate in which the percentage of hydroxyl groups substituted with acetyl groups is 44% to 51% among all hydroxyl groups, and

polyvinyl acetate in which the percentage of hydroxyl groups substituted with acetyl groups is 35% to 49% among all hydroxyl groups.

2. The granulocyte adsorbent according to claim 1 , which is insoluble in water.

3. A device comprising a container that contains the granulocyte adsorbent according to claim 1 .

4. The device according to claim 3 , wherein the container comprises an inlet and an outlet for liquid.

5. The granulocyte adsorbent according to claim 1 used for extracorporeal circulation.

6. A system for removing granulocytes used for extracorporeal circulation comprising a device comprising a container containing the granulocyte adsorbent according to claim 5 , a pump for transporting body fluid, and a pump for injecting an anticoagulant.

7. A method for producing a granulocyte adsorbent comprising steps of:

(a) obtaining polyvinyl acetate; and

(b) cleaving part of acetyl groups of said polyvinyl acetate by treating said polyvinyl acetate under alkaline conditions,

wherein said polyvinyl acetate has an unsubstituted hydroxyl group and a hydroxyl group in which H has been substituted with acetyl, wherein the percentage of hydroxyl groups substituted with acetyl groups in said polyvinyl acetate is 35% to 49% among all hydroxyl groups.

8. A method for preparing body fluid or a cell suspension from which granulocytes have been removed comprising steps of:

(a) bringing body fluid obtained from a mammalian animal or a cell suspension derived therefrom into contact with the granulocyte adsorbent according to claim 1 ; and

(b) obtaining body fluid or a cell suspension from which granulocytes have been removed.