Chromophore vs. Fluorophore

By Jaxson

Main Difference

The main difference between Chromophore and Fluorophore is that the Chromophore is a the part of a molecule responsible for its color and Fluorophore is a Agents that emit light after excitation by light. The wave length of the emitted light is usually longer than that of the incident light. Fluorochromes are substances that cause fluorescence in other substances, i.e., dyes used to mark or label othe

  • Chromophore

    A chromophore is the part of a molecule responsible for its color.

    The color that is seen by our eyes is the one not absorbed within a certain wavelength spectrum of visible light. The chromophore is a region in the molecule where the energy difference between two separate molecular orbitals falls within the range of the visible spectrum. Visible light that hits the chromophore can thus be absorbed by exciting an electron from its ground state into an excited state. In biological molecules that serve to capture or detect light energy, the chromophore is the moiety that causes a conformational change of the molecule when hit by light.

  • Fluorophore

    A fluorophore (or fluorochrome, similarly to a chromophore) is a fluorescent chemical compound that can re-emit light upon light excitation. Fluorophores typically contain several combined aromatic groups, or planar or cyclic molecules with several π bonds.Fluorophores are sometimes used alone, as a tracer in fluids, as a dye for staining of certain structures, as a substrate of enzymes, or as a probe or indicator (when its fluorescence is affected by environmental aspects such as polarity or ions). More generally they are covalently bonded to a macromolecule, serving as a marker (or dye, or tag, or reporter) for affine or bioactive reagents (antibodies, peptides, nucleic acids). Fluorophores are notably used to stain tissues, cells, or materials in a variety of analytical methods, i.e., fluorescent imaging and spectroscopy.

    Fluorescein, by its amine reactive isothiocyanate derivative FITC, has been one of the most popular fluorophores. From antibody labeling, the applications have spread to nucleic acids thanks to (FAM (Carboxyfluorescein), TET,…). Other historically common fluorophores are derivatives of rhodamine (TRITC), coumarin, and cyanine. Newer generations of fluorophores, many of which are proprietary, often perform better, being more photostable, brighter, and/or less pH-sensitive than traditional dyes with comparable excitation and emission.

  • Chromophore (noun)

    that part of the molecule of a dye responsible for its colour

  • Chromophore (noun)

    (more generally) the group of atoms in a molecule in which the electronic transition responsible for a given spectral band is located

  • Fluorophore (noun)

    A molecule or functional group which is capable of fluorescence.

  • Fluorophore (noun)

    Any group of atoms whose presence in a molecule causes the molecule to be fluorescent.

  • Fluorophore (noun)

    Any fluorescent compound.

Oxford Dictionary

Leave a Comment