To analyze the anti-allergic activity of your sample by IgE method, the most appropriate method to use would be the Enzyme-Linked Immunosorbent Assay (ELISA) method.
ELISA is a widely used technique for detecting and quantifying proteins, including IgE antibodies. In an IgE ELISA assay, the sample is coated onto a microplate, and then specific antibodies against IgE are added to the plate. The antibodies will bind to any IgE in the sample, which can then be detected using a secondary antibody that is linked to an enzyme. The enzyme will produce a detectable signal, such as a color change, which can be measured using a spectrophotometer.
To perform the anti-allergic activity analysis, you would first measure the level of IgE in a sample without your test compound, and then measure the level of IgE in a sample treated with your test compound. If the level of IgE is lower in the treated sample, it suggests that the test compound has anti-allergic activity.
Overall, ELISA is a reliable and sensitive method for measuring IgE levels and is commonly used in research and clinical settings to evaluate allergic responses.