



Product name :Cell Counting Kit (CCK)
Product Code:K009
CCK is a one-bottle solution;no premixing of components is required.CCK ,being nonradioactive, allows sensitive
colorimetric assays for the determination of the number of viable cells in cell proliferation and cytotoxicity assays.
WST-8 is reduced by dehydrogenases in cells to give an orange colored product(formazan),which is soluble in
the tissue culture medium(figure2).The amount of the formazan dye generated by dehyhrogenases in cells is
directly proportional to the number of living cells.
Figure3. Different of CCK,XTT,MTS and MTT
Figure3 shows that the cell proliferation assay using CCK correlates well with the [3H]-thymidine incorporation assay.
Thus,the CCK assay can also be substituted for the [3H]-thymidine incorporationassay.As is higher than that using
othertetrazolium salts such as MTT,XTT,MTS or WST-1.
50tests : 0.5ml×1tube
100tests : 1 ml ×1tube
500tests : 5 ml ×1bottle
1000tests : 10 ml×1bottle
3000tests : 30 ml×1bottle
CCK is stable over one year at 4℃ with protection from light .Store it at -20℃ for longer storage . Repeated thawing
and freezing causes an in crease in the background, which interferes with the assay.Please store the kit at 4 ℃ for
frequent use.
- plate reader(450nm filter)
- 96-well plate
- CO2 incubator
- 10ul and 100-200ul multi-channel pipettes
Number of Cells Determination
1.Inoculate cell suspension (100ul/well)in a 96-well plate.Pre-incubate the plate in a humidified incubator(e.g.,at 37℃,
5% CO2).
2.Add 10ul of the CCK solution to each well of the plate.
Be careful not to introduce bubbles to the wells ,since they interfere with the O.D. Reading.
4. Incubate the plate for 1 - 4 hours in the incubator.
5. Measure the absorbance at 450 nm using a microplate reader.
To measure the absorbance later, add 10μl of 1% w/v SDS or 0.1 M HCl to each well, cover the plate and store it with
protection from light at room temperature. No absorbance change should be observed for 24 hours .
Cell Proliferation and Cytotoxicity Assay
1.Dispense 100 μl of cell suspension (5000 cells/well) in a 96-well plate. Pre-incubate the plate for 24 hours in a humid
-ified incubator (e.g., at 37°C,5% CO2).
2.Add 10 μl of various concentrations of substances to be tested to the plate.
3.Incubate the plate for an appropriate length of time (e.g., 6, 12, 24 or 48 hours) in the incubator.
4.Add 10 μl of CCK solution to each well of the plate.
Be careful not to introduce bubbles to the wells, since they interfere with the O.D. reading.
5.Incubate the plate for 1 - 4 hours in the incubator.
6. Measure the absorbance at 450 nm using a microplate reader.
To measure the absorbance later, add 10 μl of 1% w/v SDS or 0.1 M HCl to each well, cover the plate and store it with
protection from light at room temperature. No absorbance change should be observed for 24 hours.
Cell Counting Kit(CCK) allows very convenient assays by utilizing ZETA LIFE‘s highly water-soluble tetrazolium salt.