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Cy3B NHS Ester (FP-1831)

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Description

Cy3B NHS Ester is an improved version of Cy3 dyes with significantly increased fluorescence quantum yield and photostability.Cy3B Dye is a bright, water-soluble, and pH insensitive from pH 4 to pH 10 orange-fluorescent dye. Cy3B conjugates of antibodies, peptides, and proteins can be excited using the 532 nm or 555 nm laser line and visualized with TRITC (tetramethylrhodamine) filter sets. Cy3 conjugates give less background than TAMRA and most other commonly used fluorescent dyes.

The NHS ester (or succinimidyl ester) is the most popular amine reactive group for labeling with the primary amines of proteins (Lys), amine-modified oligonucleotides, and other amine-containing molecules. Cy3 NHS ester is not recommended for labeling proteins at high molar ration due significant self-quenching, and only recommended for detection of moderate-to-high abundance targets. For detection of low-abundance biological targets we recommend using AZDye 555 NHS Ester (Alexa Fluor ® 555 analog), which can be attached to proteins at high molar ratios without significant self-quenching, enabling brighter conjugates and more sensitive detection.

Specifications

Unit Size1 mg, 5 mg, 25 mg, 100 mg
ReactivityPrimary amine
Abs/Em Maxima560/571 nm
Extinction coefficient120,000 cm-1M-1
SolubilityWater, DMSO, DMF
Spectrally similar dyesCy3, DyLight® 555, Alexa Fluor® 555
Molecular weight657.21
Storage Conditions-20°C.
Shipping ConditionsAmbient temperature

Abs/Em Spectra

Cy3

Protein Labeling Calculator

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