Intended use: The wash Buffer is designed as washing solution for immunohistochemical and immunocytological staining procedures on slides. Wash Buffer is primarily used with formalin-fixed paraffin-embedded tissue sections, but also with frozen, HOPE-fixed, and cytological samples as well as in immunoblot procedures. The Wash Buffer is suitable for manually operated and automated immunohistochemical staining.
Summary and explanation: Immunohistochemical staining procedures consist of sequential incubation steps with blocking solutions, antibodies and secondary reagents, enzymes and chromogenic substrates carried out on tissue sections. Washing away the applied reagents after each incubation step is critical to receive optimally stained samples. The Wash Buffer is especially designed for effective washing and therefore ensures brilliant staining results.
Reagents provided: 2500 ml Wash Buffer (20fold concentrated, adequate for 50 litres ready-to-use wash buffer)
Storage and handling: The solution should be stored at room temperature. It is stable up to the expiry date indicated on the label if undiluted. Do not use product after the expiry date. The diluted working strength solution is stable for about 1 week depending on the ambient temperature. A positive and a negative control have to be carried out in parallel to the test material. If you observe unusual staining or other deviations from the expected results which could possibly be caused by this reagent, please contact our technical support.
Principle of method: The Wash Buffer is a 20fold concentrated phosphate buffer with additives of sodium chloride, detergent, and stabilising substances. For preparation of the working strength solution the buffer concentrate is diluted 1:20 with deionised or distilled water. The resulting solution has a pH of 7.2 (7.0 to 7.4).The Wash Buffer • is wetting the tissue sections with detergent and thus reduces surface tension and improves spreading the reagents on the tissue section,• reduces unspecific binding of reagents on the tissue sample, • and because of the exact tuned salt concentration effects an excellent preservation of cell morphology.
Reagent preparation: Preparation of the Wash Buffer working strength solution: • Dilute Wash Buffer concentrate 1:20 with deionised or distilled water and mix thoroughly. • The pH-value should be at 7.2 (7.0 to 7.4). If necessary adjust pH-value with diluted NaOH or HCl solution.
Expected results: During the reaction of the substrate with horse radish peroxidase or alkaline phosphatase in the presence of a chromogen, a coloured precipitate is formed at the location of the bound primary antibody. This reaction only takes place if the target antigen is existent in the tissue. The chromogen used determines the colour of the precipitate. The analysis is carried out using a light microscope.
References: Elias JM Immunohistopathology – A practical Approach to Diagnosis ASCP Press 2003/Nadji M and Morales AR Ann N.Y. Acad Sci 420:134-139, 1983
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