BD, 550524, BD Pharmingen™ Retrievagen A (pH 6.0)

Regulatory Status: RUO
RRID: AB_2868889
Description: Description BD Retrievagen A (pH 6.0) is an antigen retrieval system that is recommended for Zinc-fixed and Formalin-fixed paraffin embedded tissue sections that show sub-optimal or no reactivity with antibodies for immunohistochemical staining. 10% neutral buffered formalin fixes the tissue by cross-linking proteins that may cause a conformational change or "masking" of the antigenic epitope leading to reduced or absent antibody reactivity. The BD Retrievagen A (pH 6.0) is designed to unmask the epitope and cause the enhancement of antibody staining. The proposed mechanism by which most of the antigen retrieval systems work is through breaking the cross-linking bonds formed between the protein molecules. It is important to realize that in spite of antigen retrieval, some antibodies do not stain on formalin-fixed paraffin embedded sections. In these situations fixing the tissue in a less harsh fixative like the IHC zinc fixative developed by BD Pharmingen (Cat. No. 550523) may be helpful. In many cases our zinc-fixative preserves the epitope leading to good antibody staining at the same time depicting good tissue morphology. However, there are a few antigens that are not preserved by any gentle fixation, and in these situations use of fresh frozen tissue for immunohistochemical staining is the only alternative.
Preparation And Storage: Preparation And Storage Store undiluted at 4°C.
Recommended Assay Procedures: Recommended Assay Procedures BD Pharmingen Retrievagen A (pH 6.0) is provided as two separate solutions that need to be mixed. Take 18 ml of BD Retrievagen A solution 1 and 82 ml of BD Retrievagen solution 2 and bring up the volume to 1 litre with distilled water. The pH of the final working solution should be around 6.0. This working solution can be stored at 4° C for up to a month. Antigen retrieval protocol is performed after deparaffinizing the slides as outlined below. 1.  Deparaffinize slides (after drying thoroughly overnight at RT) in 2 changes of xylene for 10 min each. 2.  Wash slides in 100% alcohol twice for 2 min each. 3.  Block endogenous peroxidase activity by incubating for 10 min in 3% H2O2. Rinse 2-3 times in water. 4.  Place slides in a plastic coplin jar or staining dish with the BD Retrievagen A working solution and heat to 193°F in a microwave. 5.  Mix the solution and incubate the slides at the desired temperature of 193°F for 10 min. 6.  Remove the staining dish, cover and allow the slides to slowly cool to room temperature for 20 min. 7.  Wash slides with 2-3 changes of water and continue with the blocking with normal serum and application of the primary antibody.