Flamma® 581 NHS ester
Size of product (mg)
- 1 mg
- 5 mg
- 25 mg
Flamma® 581 NHS ester
Cat. No. List below
Flamma® Fluors 581 NHS ester is a reactive form of orange fluorescent dye induced from benzindocyanine structure and used to generate a stable fluorescence signal in bioimaging. The maxima of Ex/Em values are at 581/596 nm, similar to that of Alexa 594 and Dylight 594. Flamma 581 might be excited using the 561, 568 or 578 nm laser lines and displays excellent optical property. Flamma 581 dyes can be conjugated to low-abundance biomolecules with great sensitivity and high molar ratios, allowing sensitive detection. NHS esters readily react with amine-modified oligonucleotides or amino groups of proteins, i.e. the ε-amino groups of lysine or the amine terminus of nucleotides to form a chemically stable amide bond between dye and the biomolecule. We offer Flamma Fluors 581 dye for labeling of antibodies, peptides, proteins, ligands, and amplification substrates optimized for cellular labeling and detection.
- Fluorophore: Flamma® Fluors 581
- Reactive group: NHS ester
- Excitation/Emission Max.(nm): 581/596
- Spectrally similar dyes: Alexa594, DyLight594
- Extinction coefficient: ≥ 83,000 cm-1M-1
- CF280: missing
- Appearance: Orange Solid
- Molecular Weight: 1016.14 g/mol
- Solubility: water, DMF, DMSO
- Storage conditions: -20 ℃, protect from light
|Quick link (Cat.#)||FSD series||EXmax (nm)||EMmax (nm)||Spectrally similar dyes|
|CWS1001||Flamma® 496 NHS ester||496||520||Alexa488, FITC, Cy2|
|PWS1122||Flamma® 552 NHS ester||550||564||Alexa555, DyLight549, Cy3, ATTO550|
|PWS1415||Flamma® 581 NHS ester||581||596||Alexa594, DyLight594|
|PWS1215||Flamma® 648 NHS ester||648||663||Alexa647, DyLight650, Cy5|
|PWS1515||Flamma® 675 NHS ester||675||691||Alexa680, DyLight680, Cy5.5, IRDye680LT, CF680|
|PWS1301||Flamma® 749 NHS ester||749||774||Alexa750, DyLight755, Cy7.5, IRDye750|
|PWS1603||Flamma® 774 NHS ester||774||800||Cy7.5, DyLight800, IRDye800|
BioActs offers a broad range of Flamma® Fluors dyes equipped with variety of reactive and functional groups, which can cover the full spectral range from UV to NIR with their excellent fluorescence performance. Characteristic features of these superior dyes are strong absorption, high fluorescence quantum yield and high photostability. Flamma® dyes maintain good fluorescence activity and stability after conjugation to biomolecules and allow the detection of low-abundance biological structures with great sensitivity. The dyes are compatible with optical conditions of most of fluorescent equipment and are ideal for any applications in biological studies.
- Covering the full spectral range from UV to NIR
- Equipped with a variety of reactive groups: NHS and Sulfo-NHS ester, Vinylsulfone, Maleimide, Click chemistry, isothiocyanate, hydrazide and hydrophobic substances.
- High quantum yields and photostability
- High purity and compatible with most of biomolecules
Flamma® Fluors NHS ester / Sulfo-NHS ester
Succinimidyl (NHS) esters are reliable activating moiety for amine labeling due to the formation of the strong amide bond. NHS esters are generally stable when storing in anhydrous and the dark condition at -20. NHS ester dyes display good reactivity toward aliphatic amines yet low reactivity with aromatic amines, alcohols, phenols and histidine. The basicity of an amine is an important factor for its reactivity: virtually all proteins have lysine residues, and most of them have a free N-terminus amine. The reactivity of ε-amino group at lysine is pH dependent that the optimal pH for labeling lysine residue is 8.5~9.5. However, the primary amine at N-terminus usually has a pKa value of ~7, thus it can be selectively conjugated by running the reaction in neutral pH. Due to the solubility issue, Flamma® Fluors NHS esters are required to be dissolved in an organic solvent such as DMSO or DMF and added to aqueous solution. To overcome this limitation, BioActs offers water soluble Flamma® Fluors Sulfo-NHS ester dyes, which can eliminate the usage of organic solvents in the conjugation reaction. NHS and Sulfo-NHS ester dyes are unstable under humid condition, thus they should be in a lyophilized form or a solution in the anhydrous organic solvent such as DMF or DMSO and stored at -20 ℃.
Figure 1. Absorption (upper) and emission (bottom) spectra overlap of Flamma® Fluors
Figure 2. Immunofluorescence imaging and in situ hybridization imaging
Figure 3. Fluorescence images of Flamma® 749 (upper) and Flamma® 774 (bottom) carboxylic acid injected mouse
Citation & Reference
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