What is a Fluorophore used for ?

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A fluorophore, is a part of a molecule which makes a molecule to be fluorescent. It is similar to a chromophore, the element of a molecule accountable for its color. Generally, fluorescence is used in the life sciences as a non-destructive way of analyzing biological molecules by means of fluorescence. Flurophore is a functional group (specific groups of atoms within molecules that are responsible for the distinctive chemical reactions of those molecules ) in a molecule which absorbs energy of a particular wavelength and emits energy at a different but specific wavelength. The quantity and wavelength of the emitted energy depend on  the fluorophore and the chemical atmosphere of the fluorophore. This technology is  important in the field of biochemistry and protein studies. Latest fluorophores execute better than traditional dyes as they are more photostable, brighter, and less pH-sensitive. Fluorescent particles with single or multiple fluorophores come in various sizes, emission spectra and combinations.

What are the different types of Fluorophores?

Technical advancements in fluorescence chemistry has led to the introduction of floruophores in many testing environments and different kinds of fluorphoers have been introduced. They can grouped into,

• Organic Dye : Fluorescein, a synthetic organic dye,was one of the first fluorescent compounds used in biological research. Derivatives of the first original compounds such as fluorescein isothiocyanate (FITC), rhodamine (tetramethyl rhodamine isothiocyanate, TRITC) have been used in bioconjugation. The small size of the derivatives gives them an advantage over the biological fluorophores as they can be linked to macromolecules like antibodies, biotin, without interfering with their biological function
• Biological fluorophores : These were first used in the 1990s when a a green flourescent protein also known as GFP was synthesized from the jelly fish Aequorea victoria and applied as gene expresssion reporter. After that many derivatives of the original GFP such as the phycobiliproteins examples of which are - allophycocyanin, phycocyanin, phycoerythrin and phycoerythrocyanin have been used in biological research. The advantage of biological fluorophores is that they can be used in cells, part or whole organisms to study them alone or as in combination with a protein of interest to study biological processes. But these don't provide the same photostability as synthetic fluorophores and can also change the function of the biological process in which they are being studied.
• Quantum dots : Quantum dots are 2-50nm sized semiconductors which emit fluorescence when excited at a wavelength that is dependent on the size of the particle. The smaller quantum dots emit higher energy than the larger quantum dots. The color of the emission changes from blue to red as the size increases.These are more photostable than fluorophores. They can also be coated with colors in biological studies.

What is a Quantum dot?

 Quantum dot: A quantum dot (2-10 nm (diameter)) is a part of matter (e.g. semiconductor) whose excitons are restricted in all three spatial dimensions. As a result, such materials have electronic properties in-between between bulk semiconductors and the isolated molecules. Excitons are a bound state (a composite of two or more particles or bodies that behaves as a single object) of an electron and hole which are brought together by the electrostatic force. Quantum dots in transistors, solar cells, LEDs, and diode lasers have been studied. A Quantum dot performing as agents for medical imaging is also explored. For easy understanding, quantum dots are semiconductors whose electronic features are intimately associated to the size and shape of the individual crystal. Normally, the smaller the size of the crystal, the larger the band gap, and so extra energy is needed to excite the dot, and alongside, more energy is discharges when the crystal comes back to its resting state. For example, in fluorescent dye applications, this links to higher frequencies of light emitted as the crystal size grows smaller following excitation of the dot, which results in a change of color from red to blue in the emitted light.

What are some of the common dyes?

Quite a few fluorescent proteins present are attached to a particular protein through a plasmid constructor to produce a fusion protein. Fluorophores can be binded to protein to precise functional groups, such as

•  amino groups (Active ester, Carboxylate, Isothiocyanate, hydrazine)
• carboxyl groups (carbodiimide)
•  thiol (maleimide, acetyl bromide)

These fluorophores may be quantum dots or small molecules. Every fluorophore is an aromatic compound. For instance, Benzene, a simple  aromatic hydrocarbon is excited at 254 nm and emits at 300 nm. Moreover, a variety of functional groups can be present to modify its proprieties, such as solubility, or award unique proprieties, such as boronic acid which attaches to sugars or numerous carboxyl groups to bind to some cations. If the dye has an electron-donating and an electron-accepting group at opposite ends of the aromatic system, this dye will most likely be responsive to the environment's polarity and so it is called “environment-sensitive”. Habitually, dyes are used inside You do not have access to view this node, which are resistant to charged molecules.

Some of  the dye families are:

• Xanthene derivatives : fluorescein, rhodamine, Oregon green, eosin, Texas red, and Cal Fluor dyes (biotechnology company based in Novato, California)
•  Cyanine derivatives : Cyanine, indocarbocyanine, oxacarbocyanine, thiacarbocyanine, merocyanine, and Quasar dyes
•  Naphthalene  is an organic compound and its  derivatives are dansyl and prodan derivatives
•  Coumarin  derivatives are found in plants.

What are the applications of Fluorescent dyes?

Fluorescent dyes are used in industries and are called "Neon colors", such as

•  multi-ton scale usages in textile dyeing and optical brighteners in laundry detergents
•  sophisticated cosmetic formulations; safety tools and clothing
•  organic light-emitting diodes (OLED)
•  fine arts and design (posters and paintings)
•  synergists for insecticides and experimental drugs
•  For providing a glow-like effect, used as a dye in highlighters. 

What is Immunofluorescence ?

Is a method used for light microscopy with a fluorescence microscope and is mainly used on biological samples.

What is Immunohistochemistry ?

 It refers to the technique of tracking antigens (e.g., proteins) in You do not have access to view this node. 

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