What are HRP-conjugated antibodies?
HRP-conjugated antibodies amplify signal in bioassays, making target antigens easier to detect. They are linked to horseradish peroxidase (HRP), an enzyme that converts chromogenic substrates into colored products. This reaction is measurable by spectrophotometry, making HRP conjugates ideal for western blot, ELISA, and immunohistochemistry.
Key features of HRP-conjugated antibodies
High sensitivity and signal amplification
HRP conjugates boost detection, allowing you to identify low-abundance proteins with confidence.
Stability for consistent results
These conjugates maintain enzymatic activity during incubation and substrate development, ensuring reproducibility in ELISA, western blot, and IHC.
Fast detection
HRP reacts quickly with its substrate, so you get results faster without compromising accuracy.
Applications of HRP-conjugated antibodies
HRP conjugates are widely used in:
- Immunohistochemistry (IHC): Detect antigens in tissue sections for clear imaging in research and clinical settings.
- ELISA: Achieve sensitive quantification of proteins in complex samples.
- Western blotting: Visualize protein bands with a strong, reliable signal.
Advantages of using HRP
- Cost-effective: HRP substrates are affordable and widely available.
- Versatile: Works with multiple chromogenic substrates for different assay needs.
- High signal-to-noise ratio: Produces sharp, clear results even in complex samples.
Comparison with other conjugates
HRP vs Alkaline Phosphatase (AP):
- HRP offers faster reaction times and strong signal intensity.
- AP is better for assays requiring prolonged development or where HRP inhibitors are present.
HRP vs Fluorophore conjugates:
- HRP is ideal for colorimetric detection, while fluorophores are suited for fluorescence-based imaging.
FAQ
What are HRP-conjugated antibodies used for?
HRP-conjugated antibodies are widely used in IHC to detect antigens in tissue sections, providing clear imaging of cellular components in clinical and research settings. They are also routinely used in ELISA and western blotting.
Can HRP-conjugated antibodies be used in multiplex assays?
Yes, HRP-conjugated antibodies can be combined with other enzyme-conjugated antibodies (like AP) for multiplex assays as long as the substrate for each enzyme results in distinctly different colored products.
Are HRP-conjugated antibodies suitable for fluorescence detection methods?
No, HRP-conjugates are not suitable for fluorescence detection as they require a chromogenic substrate to generate a visible signal. For fluorescence applications, consider using fluorophore-conjugated antibodies.