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.
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.
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.
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).
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.
Size: 5 mg
The cell-permeant SYTO 60 red fluorescent nucleic acid stain exhibits bright, red fluorescence upon binding to nucleic acids. Because the staining pattern of the SYTO dyes in live cells may vary between cell types, we offer the SYTO Red Fluorescent Nucleic Acid Stain Sampler Kit (S-11340) to enable researchers to find the most appropriate red-fluorescent SYTO stain for their system.
Size: 250 µl
SYTOX® Green nucleic acid stain is an excellent green-fluorescent nuclear and chromosome counterstain that is impermeant to live cells, making it a useful indicator of dead cells within a population. • Impermeant to live cells • Excitation/Emission: 504/523 nm • Use with 488 Argon-ion laser • Works with mammalian cells and both Gram-positive and Gram-negative bacteria Simple Viability Determination SYTOX® Green allows quick determination of cell viability when using flow cytometers, fluorescence microscopes, fluorometers, or fluorescence microplate readers. It will not cross intact membranes, ...
Size: 250 µl
The cell-permeant SYTO 82 orange fluorescent nucleic acid stain exhibits bright, orange fluorescence upon binding to nucleic acids. Because the staining pattern of the SYTO dyes in live cells may vary between cell types, we offer the SYTO Orange Fluorescent Nucleic Acid Stain Sampler Kit (S-11360) to enable researchers to find the most appropriate orange-fluorescent SYTO stain for their system.
Size: 250 µl
Intracellular calibration of the fluorescence response of cytosolic pH indicators is typically performed using the K + /H + ionophore nigericin , which causes equilibration of intracellular and extracellular pH in the presence of a depolarizing concentration of extracellular K + .
Size: 10 mg
To permit simultaneous long-term tracing of mixed-cell populations using different fluorescent colors, we have developed a probe whose applications should be similar to those of CFDA SE (commonly called CFSE). Cells labeled with our SNARF-1 carboxylic acid, acetate, succinimidyl ester have orange-red fluorescence that can be easily distinguished from that of cells loaded with green-fluorescent tracers such as CFDA SE.
Size: 10 × 50 µg
DNDS is a stilbene sulfonate that can be used to inhipit anionic transport.
Size: 1 g
DAPI is a commonly used nuclear counterstain for fixed cells that emits blue fluorescence when bound to DNA. With NucBlue® Fixed Cell ReadyProbes™ Reagent, we have formulated a high-purity form of this classic stain in a room temperature-stable solution that is provided in a convenient-to-use dropper bottle. Just tip and drip two drops per ml to stain your cells. Features of NucBlue® Fixed Cell ReadyProbes™ Reagent: Ready-to-use liquid DAPI formulation No need to dilute, weigh, or pipette Convenient dropper bottle—just use two drops per ml Stable at room temperature—keep handy at your scope or...
Size: 1 kit
The superoxide indicator dihydroethdium , also called hydroethidine, exhibits blue-fluorescence in the cytosol until oxidized, where it intercalates within the cell's DNA, staining its nucleus a bright fluorescent red.
Size: 1 ml
FxCycle™ PI/RNase Staining Solution is used for flow cyotmetric analysis of DNA content in fixed cells. Propidium iodide (PI), a popular red-fluorescent stain, binds to DNA by intercalating between the bases with little or no sequence preference and with a stoichiometry of one dye per 4–5 base pairs of DNA. PI also binds to RNA, necessitating treatment with RNase to distinguish between RNA and DNA staining. This propidium iodide solution includes DNase-free RNase A and a permeablization reagent. It comes ready to use: simply add the staining solution to fixed cells, incubate, and acquire on a ...
Size: 100 mL
NucGreen™ Dead 488 ReadyProbes™ Reagent is a cell-impermeant stain that emits exceptionally bright, green fluorescence when bound to DNA. Cells that have lost plasma membrane integrity are stained within minutes, making this an extremely useful stain to estimate live/dead cell ratios and to measure cytotoxicity in kinetic live-cell assays. It is also suitable for staining nuclei in fixed cell preparations and tissue sections. Like other ReadyProbes™ reagents, NucGreen™ Dead 488 reagent is formulated as a room temperature-stable solution and comes in a convenient dropper bottle. Just tip and dr...
Size: 1 kit
NucRed™ Live 647 ReadyProbes™ Reagent is a cell-permeant nuclear stain that emits bright, far-red fluorescence when bound to DNA. Like other ReadyProbes™ reagents, NucRed™ Live 647 reagent is formulated as a room temperature-stable solution and comes in a convenient dropper bottle. Just tip and drip two drops per ml to stain your cells. NucRed™ Live 647 ReadyProbes™ Reagent provides: • Exceptionally bright far-red fluorescence well separated from blue, green, and red fluorophores • Rapid staining of live or fixed cells without wash steps • Ready-to-use liquid formulation in convenient dropper ...
Size: 1 kit
The cell-impermeant viability indicator ethdium homodimer-1 (EthD-1) is a high-affinity nucleic acid stain that is weakly fluorescent until bound to DNA and emits red fluorescence (excitation/emission maxima ~528/617).
Size: 1 mg
The high-affinity nucleic acid stain BOBO™-1 has excitation/emission maxima ~462/481 nm when bound to double-stranded DNA in aqueous solution. This cyanine dimer is cell-impermeant.
Size: 200 µl
Because it is manufactured at our ISO 9001—certified facilities in Eugene, Oregon, we can guarantee that FluoroPure Grade Hoechst 33342 is greater than or equal to 98% pure by HPLC.
Size: 100 mg
Acridine Orange is a cell-permeant nucleic acid binding dye that emits green fluorescence when bound to dsDNA and red fluorescence when bound to ssDNA or RNA. This unique characteristic makes acridine orange useful for cell-cycle studies. Acridine orange has also been used as a lysosomal dye. This dye is available in solution (A-3568).
Size: 1 g