Baby rabbit complement has long been the World Health Organization’s recommended standard complement option for functional antibody assays to evaluate vaccine efficacy. Pel-Freez Biologicals has been a leading source of 3-4 week rabbit complement for decades. It continues to provide products of consistent quality for some of the largest vaccine manufacturers in the world, as […]

Does your company or lab work with human sera samples? Are you a vaccine developer and have finally obtained those rare patient samples for your assay? Our antibody-depleted human serum can help you extend the volume of your precious sera sample today. In this piece, we’re going to discuss what our antibody depleted human serum […]

For decades Pel-Freez has been the largest US producer of rabbit blood fractions and rabbit complement. Our baby rabbit complement is used globally in serum bactericidal assays (SBA) and opsonophagocytic assays (OPA) with great success. However, our customers began expressing frustration that there was no reliable supplier when human complement when required for these assays. […]

The process of antibody production, whether hybridoma or recombinant protein production in mammalian cells or bacteria, necessitates antibody isolation from other proteins present in the sample (cell lysate, medium, ascites fluid, sera, etc.). Isolating the antibody of interest requires applying the proper strategy, depending on the class, species, and status (tagged or untagged) of the […]

Many people tend to have perennial respiratory infections, eczema, or allergies that cannot be diagnosed with routine tests, such as lymphocyte subsets, immunoglobulin series, and white blood cells. Testing the levels of the five types of immunoglobulins is also necessary. However, while many people undergo these tests under their doctor’s recommendations, most don’t understand what […]

Immunoassays are used in the detection and quantification of molecules that are of biological interest, based on the selectivity and specificity of certain antibody reagents. Access to sustainable and quality sources of reagents is crucial when it comes to developing the same type of immunoassays over long periods. We’ve prepared this piece as a guide to […]