biotin labeling psorlen kit
Searching for superior alternatives to fluorescein? Our Alexa Fluor Dye Series offers everything you're looking for and more.
Catalog: F-150
Size: 25 mg
Size: 25 mg
Searching for superior alternatives to fluorescein? Our Alexa Fluor Dye Series offers everything you're looking for and more.
Catalog: C-6164
Size: 10 mg
Size: 10 mg
Conjugates prepared with the thiol-reactive Alexa Fluor 647® C 2 maleimide are spectrally similar to the Cy5 dye, resulting in an optimal match to optical filters for the Cy5 dye. Total fluorescence of secondary antibody conjugates of Alexa Fluor® 647 dye, however, is significantly higher than that of Cy5 conjugates. Unlike the Cy5 dye, Alexa Fluor® 647 dye has very little change in absorption of fluorescence spectra when conjugated to most porteins, oligonucleotides, or nucleic acids, yielding greater total fluorescence at the same degree of substitution.
Catalog: A-20347
Size: 1 mg
Size: 1 mg
The amine-reactive PyMPO succinimidyl ester can be used to create bioconjugates with this environment-sensitive fluorophore.
Catalog: S-6110
Size: 5 mg
Size: 5 mg
The thiol-reactive Alexa Fluor 546 C 5 maleimide and its conjugates are perfect for applications that require orange-fluorescent probes. Spectrally similar to the Cy3 dye, the Alexa Fluor 546 dye is readily excited by the 546 nm line of the mercury-arc lamp and the 543 nm line of the He-Ne laser.
Catalog: A-10258
Size: 1 mg
Size: 1 mg
The amine-reactive Lissamine™ rhodamine B sulfonyl chloride can be used to create red-fluorescent bioconjugates with excitation/emission maxima ~568/583 nm.
Catalog: L-20
Size: 1 g
Size: 1 g
Our 4-acetamido-4'-maleimidylstilbene-2,2'- disulfonic acid is a thiol-reactive reagent that is water soluble, with high polarity and membrane impermeability. This polysulfonated dye is useful for determining whether thiol-containing proteins and polypeptide chains are exposed at the extracellular or cytoplasmic membrane surface.
Catalog: A-485
Size: 25 mg
Size: 25 mg
DTNB or Elman's reagent can be used to quantitate thiols in proteins, cells and plasma by absorption measurements. It readily forms a mixed disulfide with thiols, liberating the chromophore 5-merapto-2-nitrobenzoic acid (absorption maximum 410 nm). Only protein thiols that are accessible to this water-soluble reagent are modified.
Catalog: D-8451
Size: 10 g
Size: 10 g
Tetrafluorophenyl (TFP) esters are an improvement over the succinimidyl ester (SE or NHS-ester) chemistry typically used to attach fluorophores or haptens to the primary amines of biomolecules. Both reactive chemistries produce the same strong amide bond between the dye or hapten and the compound of interest, but TFP esters are less susceptible to spontaneous hydrolysis during conjugation reactions. Alexa Fluor TFP esters are stable for several hours at the basic pH typically used for reactions – far outlasting succinimidyl esters.
Catalog: A-30005
Size: 1 mg
Size: 1 mg
Conjugates prepared with the thiol-reactive Alexa Fluor 488 C 5 maleimide are significantly brighter and more photostable than fluorescein. The bright, green fluorescence of the Alexa Fluor 488 dye, which is spectrally similar to that of fluorescein, is pH independent from pH 4 to 10.
Catalog: A-10254
Size: 1 mg
Size: 1 mg
The amine-reactive Alexa Fluor 430 carboxylic acid, succinimidyl ester and its conjugates exhibit the rare combination of absorption between 400 nm and 450 nm and fluorescence emission beyond 500 nm (excitation/emission maxima ~434/539 nm).
Catalog: A-10169
Size: 5 mg
Size: 5 mg
This single 5-isomer preparation of our proprietary, amine-reactive dye, Oregon Green 488 carboxylic acid, succinimidyl ester and its conjugates have green fluorescence similar to that of fluorescein but are more photostable. Additionally, Oregon Green 488 dye has a lower pK a than fluorescein (pK a = 4.7 versus 6.4 for fluorescein), making this bright dye less pH sensitive in the physiological range.
Catalog: O-6147
Size: 5 mg
Size: 5 mg
Pacific Green™ Succinimidyl Ester is a violet-excitable (411 nm) dye with an emission maximum at ~500 nm, allowing it to be used with other violet-excitable fluorophores (such as Pacific Blue™ or Pacific Orange™ dye) for multiparameter analysis using a single excitation source. As a class of compounds, succinimidyl esters offer an efficient and easy-to-use means for selectively linking a dye to accessible primary amine groups on proteins, modified nucleic acids, or other biomolecules. The covalent bonds formed are as stable as the peptide bonds used to link the amino acids within proteins. Pac...
Catalog: P11202
Size: 250 µg
Size: 250 µg
biotin labeling psorlen kit
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