Isotype control antibodies are essential negative controls in immunology experiments. They match the host species, isotype, and format of the primary antibody but lack target specificity, allowing researchers to distinguish true antigen-specific signal from non-specific binding caused by Fc receptor interactions, electrostatic attraction, or secondary antibody cross-reactivity.
abinScience offers one of the most comprehensive isotype control panels in the market — over 400 recombinant isotype control antibodies spanning human IgG1, IgG2, IgG3, IgG4, IgA, IgA2, mouse IgG1, IgG2a, IgG2b, and rabbit IgG. Our collection includes Fc-engineered variants (LALA, LALAPG, N297A, S239D/I332E, afucosylated) critical for in vivo studies and functional assay controls.
Why abinScience?
✓ 400+ SKUs — The broadest recombinant isotype control panel from a single supplier
✓ Full subclass coverage — Human IgG1–IgG4, IgA, IgA2, IgE, IgM; Mouse IgG1, IgG2a, IgG2b; Rabbit IgG
✓ Fc-engineered variants — LALA, LALAPG, N297A, afucosylated, S239D/I332E, and more for precise functional controls
✓ Conjugates available — FITC, PE, APC, PerCP, Biotin, and HRP-labeled isotype controls for direct detection
Available Products
Human IgG Isotype Controls (Selected)
Representative products from our extensive human isotype control panel. View all isotype controls →
About the Target
What makes a good isotype control?
An effective isotype control must match your test antibody in four dimensions: host species (human, mouse, rabbit), isotype/subclass (IgG1, IgG2a, IgG4, etc.), format (whole IgG, F(ab')₂, Fc), and conjugate (if using direct detection). In functional assays and in vivo studies, the Fc region variant is an additional critical matching parameter — an LALA-mutant test antibody requires an LALA-mutant isotype control, not a wild-type IgG1.
All abinScience isotype controls are produced using recombinant expression, ensuring defined sequence, high purity, low endotoxin, and lot-to-lot consistency. Unlike hybridoma-derived controls, recombinant isotype controls eliminate the risk of co-purified immunoglobulins that can introduce artifacts.
Frequently Asked Questions
When should I use an isotype control?
Isotype controls are most valuable in flow cytometry (to set gating thresholds), IHC/IF (to assess non-specific tissue binding), and in vivo studies (to control for Fc-mediated effects). In western blot, a no-primary-antibody control is generally more informative than an isotype control.
Why do I need Fc-variant isotype controls?
In functional studies, the Fc region drives effector functions (ADCC, CDC, FcR engagement). If your test antibody carries an Fc mutation (e.g., LALA to silence effector function, or S239D/I332E to enhance ADCC), the isotype control must carry the same mutation. A wild-type Fc control in this context would introduce a confound by exhibiting different effector activity than your test antibody.
How do I find the right isotype control for my experiment?
Match these four parameters to your test antibody: species origin, IgG subclass, Fc variant (if any), and conjugate label. Use the filters on our isotype control catalog page to narrow down, or contact us for assistance.
Need Help Selecting the Right Product?
Our scientists can help match the right antibody or protein to your application.
Contact Technical Support
All products are for research use only (RUO). Not intended for diagnostic or therapeutic use. Product availability and specifications are subject to change. Visit individual product pages for the most current information.
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