Determination of the titer
To determine the titer, an ELISA was performed using a serial dilution of the antibody directed against H3K18ac (Cat. No. 25236). The antigen used was a peptide containing the histone modification of interest. By plotting the absorbance against the antibody dilution (Figure 1), the titer of the antibody was estimated to be 1:8,800.

Cross reactivity test using the antibody directed against H3K18ac
A Dot Blot analysis was performed to test the cross reactivity of the antibody against H3K18ac (Cat. No. 25236) with with peptides containing other modifications and unmodified sequences of histone H3. One hundred to 0.2 pmol of the peptide containing the respective histone modification were spotted on a membrane. The antibody was used at a dilution of 1:1,000. Figure 2 shows a high specificity of the antibody for the modification of interest.

Western blot analysis using the antibody directed against H3K18ac
HeLa cells were treated with butyrate and histone extracts (15 μg) were analysed by Western blot using the antibody against H3K18ac (Cat. No. 25236) diluted 1:250 in TBS-Tween containing 5% skimmed milk (lane 1). Lane 2 shows a coomassie blue staining of the gel. The position of the protein of interest is indicated on the left; the marker (in kDa) is shown on the right.

Store at –80°C for up to 2 years. Centrifuge after first thaw to maximize product recovery. Aliquot to avoid repeated freeze/thaw cycles. Aliquots may be stored at –20°C for at least one month.