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Molecular Probes

Molecular Probes®

Molecular Probes® Invitrogen is committed to being the leading provider of novel fluorescent reagents and detection solutions that advance scientific and biomedical research worldwide. Supplying superior Molecular Probes® products and services, together with striving for customer and employee satisfaction, will be the driving forces of our organization.

Molecular Probes® Products

Alexa Fluor® dyes

The Alexa Fluor® dyes

A series of superior fluorescent dyes that span the visible spectrum  and which represent a major breakthrough in the development of fluorescent labeling reagents.


Qdot® nanocrystals

Combine the revolutionary fluorescence performance with a highly customizable surface for directing the bioactivity of Qdot® nanocrystals to a wide range of molecules of interest.

New on the Web

  • Cell Health
    Looking for products to monitor the health of your cells?  Invitrogen offers a wide range of technologies and products that can help you get the most out of your cells, including  assays for cell proliferation, cell viability and our just released Countess™ Automated Cell Counter.


    Amplex® Red Enzyme Assays
    We offer validated solutions for enzyme activity assays using Molecular Probes® extremely versatile Amplex® Red reagent (and the second generation Amplex® UltraRed reagent).These include ultrasensitive assays for enzymes that produce hydrogen peroxide and are key in the study of metabolism, signaling and lipids, inflammation and immune response and neurobiology. 

Application Areas

New Technologies

New Technologies

Highlighting the latest and greatest technologies for labeling and detection in fixed and live cells.

Flow Cytometry & Imaging

Flow Cytometry

Fluorescence Imaging

We're bringing together the best names in flow cytometry and cellular imaging. Molecular Probes®, Caltag™, Dynal®, Qdot®, Zymed®, and BioSource™ are part of Invitrogen. So now you can find the most reliable and effective innovations in flow cytometry  and fluorescence imaging in one place.


The Handbook—A Guide to Fluorescent Probes and Labeling Technologies

The Handbook

The Handbook—A Guide to Fluorescent Probes and Labeling Technologies is a comprehensive resource for fluorescence technology and its applications. Newly revised, The Handbook contains detailed information describing the use of more than 3000 Molecular Probes® products for life science research, including extensive data, numerous technical notes, and full-color images of the products in action.