Goat Antiserum to Human Secretory IgA

Analysis Note The total protein is measured using the Biuret procedure, with bovine albumin as a standard. Antibody titer is standardized by equivalence-point precipitation. Each antiserum is tested for specificity at a minimum of 80 mg/mL using immunoelectrophoresis. Preparation Method The antiserum is prepared by hyperimmunizing goats with highly purified human secretory IgA; antiserum is delipidated and made specific by solid-phase absorption. The resulting antiserum is dialyzed into 0.02M sodium phosphate, 0.14M sodium chloride, pH 7.3, with 0.05% sodium azide, adjusted to standard titer, filtered through a 0.22 µm filter, vialed and lyophilized. Background Information IgA antibody is a secretory antibody and is present abundantly in mucous linings of gastrointestinal, respiratory and genitourinary tracts, tears and saliva. Thus, secretory IgA contributes to the humoral defense mechanism against the pathogens on mucosal surfaces. Anti-Human IgA (α-chain specific) antibody specifically recognizes human IgA. Immunoglobulin A (IgA) is the primary antibody involved in mucosal immunity. It is identified by the presence of α-type heavy chains. IgA, which is composed of two subclasses IgA1 and IgA2, can exist in a dimeric secretory form found in mucous secretions. Applications This product is suitable for use as a precipitating antibody. It gives sharp precipitin lines in immunoelectrophoresis and immunodiffusion techniques. It is suitable for Ouchterlony double diffusion. The antibody was used for IgA quantification by ELISA in various studies. Antibody dilution of 1:4000 was used for passive hemagglutination inhibition assay. Product Description Product is the lyophilized powder of goat antiserum to human secretory IgA and buffer salts. Typical Working Concentration Suggested working dilution: 1:50 - 1:200 for Tissue Staining; 1:100 - 1:500 for Immunoblotting; 1:400 - 1:2,000 for ELISA