5-carboxyfluorescein

5(6)-Carboxyfluorescein (5-(and-6)-Carboxyfluorescein mixed isomers) contains a carboxylic acid that can be used to react with primary amines via carbodiimide activation of the carboxylic acid.

CFSE (CFDA-SE) is a fluorescent dye with cell membrane permeability. CFSE irreversibly binds to intracellular proteins in living cells and is used for the detection of cell proliferation. The labeled cells fluoresce in green color with excitation wavelength of 488 nm and emission wavelength of 518 nm.

BCECF is a fluorescent probe commonly used to measure pH. It is a dual-excitation ratiometric pH indicator with a pKa of ~6.98. Measurements of pH are made by determining the ratio of emission intensity, detected at 535 nm when excited at 490 nm versus th

5(6)-CFDA (5-(6)-Carboxyfluorescein diacetate) is a cell-permeant esterase substrate that can serve as a viability probe that measures both enzymatic activities, which is required to activate its fluorescence, and cell-membrane integrity, which is required for intracellular retention of their fluorescent product.

5(6)-FAM SE (5(6)-Carboxyfluorescein N-hydroxysuccinimide ester) is an amine-reactive green fluorescent dye. 5(6)-FAM SE is widely used for labeling proteins or other molecules that contain a primary or secondary aliphatic amine.

5-CFDA (5-Carboxyfluorescein diacetate)(5-Carboxyfluorescein diacetate) is membrane-permeant. It can be loaded into cells via incubation and hydrolyzed by intracellular esterases to 5-carboxyfluorescein that is used for labeling human intervertebral disk cells in vitro for fluorescence microscopy.

5-FAM (5-Carboxyfluorescein) (5-Carboxyfluorescein) contains a carboxylic acid, which can be used to react with primary amines via carbodiimide activation of the carboxylic acid. Fluorescein is the most common fluorescent derivatization reagent for labeling biomolecules. In addition to its excellent fluorescence quantum yield, relatively high absorptivity, and good water solubility, it also has an excitation maximum that closely matches the 488 nm spectral line of the argon-ion laser.

5-FAM-LL-37 is a fluorescently labeled antimicrobial peptide conjugated to 5-carboxyfluorescein (5-FAM) through a 6-aminohexanoic acid (Ahx) linker, featuring excitation/emission maxima at 492/518 nm, respectively. This compound integrates the functional attributes of LL-37 with the fluorescent properties of 5-FAM for enhanced visualization.

5-FAM-LPETGG is a fluorescent peptide that combines the sortase recognition sequence LPETGG with the fluorescent label 5-carboxyfluorescein (5-FAM), characterized by excitation/emission maxima at 492/518 nm. It serves for site-specific labeling of target proteins through sortase-catalyzed transpeptidation.

5-CFDA-AM is a cell-permeable esterase substrate employed as an active probe to assess enzyme activity and cell membrane integrity. Electroneutral and capable of entering cells at concentrations lower than CFDA, it undergoes intracellular hydrolysis by esterases, generating carboxyfluorescein, which possesses an extra negative charge, allowing for improved cellular retention [1].