How do you present western blot quantification?

Step 1: Determine the background-subtracted densities of your protein of interest (PI) and the normalizing control (NC). Step 2: Identify the NC that has the highest density value. Step 3: Divide all the NC values by the highest NC density value to get a relative NC value.

Can Western blots be quantitative?

Western blot is a reliable quantitative method only if sample properties and integrity, antibody specificity to the target protein, and loading protocols are considered.

How do you Destain a Ponceau S?

Ponceau S Staining Technique Dissolve 0.4g Ponceau S in 198 mL of dH20, and stir for 30 minutes. Add 2 mL of acetic acid to the mixture. The staining procedure for Ponceau S is the same as that described for Coomassie Blue##), with the substitution of dH2O as the destaining solution.

How do you quantify western blot with Image J?

You can quantify by the following steps:

1. Open western image in Image J, select Rectangular Selections tool from the ImageJ toolbar and select first western band.
2. Press Ctrl +1 and drag the same rectangle selection to the next band and press Ctrl + 2.

How do you statistically analyze western blot data?

To know how to analyze western blot data, Look for the sizes of the bands. These will be represented by a number, either followed by “kDa” or preceded by “p.” This is the size of the protein which has been detected and is the scale on which the proteins are separated in a Western blot.

Why is western blot semi quantitative?

It is very important to be aware that the data produced with a western blot is typically considered to be semi-quantitative. This is because it provides a relative comparison of protein levels, but not an absolute measure of quantity.

How do you analyze Western blot results?

How much protein do I need in WB?

To obtain linear signals with the majority of western blots, we recommend loading smaller amounts of protein sample between 1 and 10 μg per well. To avoid under- or overloading samples, determine the protein concentration of each sample prior to electrophoresis with a compatible protein assay.

Can you do Ponceau after blocking?

You should ponceau before blocking, as the presence of block on the membrane will increase background. To determine changes in protein expression you need to do western blot – it is specific for your protein, which ponceau is not. You can use ponceau to judge overall protein expression, but not for specific proteins.

How do you remove Ponceau stain from a blot?

Completely submerge with Ponceau stain and put on rocker ▪ Nitrocellulose membranes saturate in ~5 min. PVDF membranes saturate in ~15 minutes. 3. Remove Ponceau from non-protein parts of the membrane via gentle rinsing with distilled H2O.

How do you quantify in ImageJ?

Using ImageJ to Quantify Bands

1. Save gel image and adjust to be vertically oriented.
2. Using a rectangular box (box tool)select entire lane.
3. Select lane either by selecting Analyze->Gels->Select First Lane or press CTRL-1.