Texas Red

Texas Red

Chembox new
Name = Texas Red
ImageFile = Texas Red.png ImageName =
IUPACName =
Section1 = Chembox Identifiers
CASNo = 82354-19-6
SMILES =

Section2 = Chembox Properties
Formula = C31H29S2N2O6Cl1
Density =
MeltingPt =
BoilingPt =

Texas Red or sulforhodamine 101 acid chloride is a red fluorescent dye, with a molecular weight of 625 daltons, used in histology for staining cell specimens, for sorting cells with fluorescent-activated cell sorting machines, in fluorescence microscopy applications, and in immunohistochemistry. [cite journal |author=Titus JA, Haugland R, Sharrow SO, Segal DM |title=Texas Red, a hydrophilic, red-emitting fluorophore for use with fluorescein in dual parameter flow microfluorometric and fluorescence microscopic studies |journal=J. Immunol. Methods |volume=50 |issue=2 |pages=193–204 |year=1982 |pmid=6806389 |doi=10.1016/0022-1759(82)90225-3] [ [http://www.sigmaaldrich.com/sigma/product%20information%20sheet/s3388pis.pdf Sulforhodamine 101 acid chloride] Sigma-Aldrich product information] Texas Red fluoresces at about 615 nm, and the peak of its absorption spectrum is at 589 nm, making it more purple than red, actually. The powder is dark purple. Solutions can be excited by a dye laser tuned to 595-605 nm, or less efficiently a krypton laser at 567 nm. The absorption extinction coefficient at 596 nm is about 85,000 M-1cm-1.

The compound is usually a mixture of two monosulfonyl chlorides, i.e. as pictured, or with the SO3 and SO2Cl groups exchanged. It can be used as a marker of proteins, with which it easily forms conjugates via the sulfonyl chloride (SO2Cl) group. In water, the sulfonyl chloride group of unreacted Texas Red molecules hydrolyses to sulfonate and the molecule becomes the very water soluble sulforhodamine 101 which is easy to wash out selectively. This is one of the advantages of conjugating with Texas Red vs. using a rhodamine-isothiocyanate for conjugation.

A protein with the Texas Red chromophore attached can then itself act as a fluorescent labelling agent; an antibody with a fluorescent marker attached will bind to a specific antigen and then show the location of the antigens as shining spots when irradiated. It is relatively bright, and therefore can be used to detect even weakly expressed antigens. Other molecules can be labeled by Texas Red as well, eg. various toxins. The dye dissolves very well in water as well as other polar solvents, e.g. Dimethylformamide, acetonitrile.

Texas Red, attached to a strand of DNA or RNA, can be used as a molecular beacon for highlighting specific sequences of DNA. Texas Red can be linked with another fluorophore. A tandem conjugate of Texas Red with R-phycoerythrin (PE-Texas Red) is often used.

Fluorophores, like Texas Red, are commonly used in molecular biology techniques like quantitative RT-PCR and cellular assays. [cite journal |author=Ahmad AI, Ghasemi JB |title=New FRET primers for quantitative real-time PCR |journal=Anal Bioanal Chem |volume=387 |issue=8 |pages=2737–43 |year=2007 |pmid=17308892 |doi=10.1007/s00216-007-1123-4]

Newer rhodamine derivatives, such as Alexa 594 and DyLight 594, have been tailored to match the excitation and emission spectra of Texas Red and are used in various chemical and biological applications where greater photostability or higher fluorescence intensity are needed.

References


Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • Texas Red — Général No CAS …   Wikipédia en Français

  • Texas Red — Strukturformel Allgemeines Name Texas Red Andere Namen Sulforho …   Deutsch Wikipedia

  • Texas Red Oak — Taxobox name = Texas Red Oak regnum = Plantae divisio = Magnoliophyta classis = Magnoliopsida ordo = Fagales familia = Fagaceae genus = Quercus species = Q. buckleyi binomial = Quercus buckleyi binomial authority = Nixon DorrTexas Red Oak (… …   Wikipedia

  • Texas red oak — teksasinis ąžuolas statusas T sritis vardynas apibrėžtis Bukinių šeimos medieninis augalas (Quercus texana), paplitęs Šiaurės Amerikoje. atitikmenys: lot. Quercus texana angl. Nuttall s oak; Texas red oak šaltinis Valstybinės lietuvių kalbos… …   Lithuanian dictionary (lietuvių žodynas)

  • texas red oak — noun also texas oak Usage: usually capitalized T : a usually small to medium sized oak (Quercus texana) of dry Texas uplands having a reddish brown bark, deeply lobed leaves, and usually solitary short stalked biennial acorns …   Useful english dictionary

  • Red Oak (Texas) — Red Oak …   Deutsch Wikipedia

  • Red River — may refer to the following: Rivers and their namesakes * Red River (Mississippi watershed), a Mississippi River tributary flowing between Texas and Oklahoma ** Red River (film), USA ** Red River Campaign, a series of battles fought in the… …   Wikipedia

  • Red River — (englisch für „Roter Fluss“) heißen mehrere Flüsse: der Red River of the North, verläuft durch Minnesota, North Dakota und Manitoba ins Red River Valley der Red River (Mississippi), Nebenfluss des Mississippi in Texas, Oklahoma, Arkansas und… …   Deutsch Wikipedia

  • Red light camera — Red light cameras help to enforce traffic laws by automatically photographing vehicles disobeying stop lights. The system continuously monitors the traffic signal and the camera is triggered by any vehicle entering the intersection above a preset …   Wikipedia

  • Red Oak — is the name of several places in the United States, all named for the Red Oak tree:*Red Oak, Georgia *Red Oak, Iowa *Red Oak, North Carolina *Red Oak, Oklahoma *Red Oak, Texas *Red Oaks Mill, New York …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”