5-Cyano-2,3-di-(p-tolyl)tetrazolium chloride (CTC), a redox-sensitive red fluorescent dye, effectively measures metabolic activity in microorganisms. It emits at a maximum wavelength of 602 nm [1].

Trx-red (NBL-SS perchlorate) is a red-emitting fluorescent probe derived from the Nile blue fluorophore, specifically designed for imaging thioredoxin (Trx) in live cells and in vivo, with excitation and emission wavelengths of 615 nm and 661 nm, respectively.

Texas Red-X succinimidyl ester,suitable for high bright Red succinimidyl fluorescence excitation/emission maximum ~ 595/615 nm.This reactive dye contains additional amino hexanoic acid and succinimide groups.This interval helps to distinguish between the

Janelia Fluor 646, Tetrazine (JF646, Tetrazine) is a red fluorescent dye with a tetrazine moiety, suitable for cellular imaging [1].

Janelia Fluor 646, Azide (JF646, Azide) is a red-emitting fluorogenic dye with an Azide click chemistry group, ideal for live-cell imaging experiments [1][2].

DDAO-C6, a cridone ester derivative, serves as a highly specific fluorescent probe for detecting human serum albumin (HSA). Additionally, it functions as an enzymatically activatable near-infrared fluorescent probe, facilitating the visual detection of endogenous lipase produced by gut microbes (Ex/Em=600/658 nm) [1] [2].

Janelia Fluor®646b, Maleimide, is a blinking red fluorescent dye equipped with a maleimide group that allows for conjugation through thiol reactivity.

BODIPY 630/650 Maleimide is a far-red fluorescent probe and the maleimide derivative of BODIPY 630/650. The maleimide group enables covalent conjugation with thiol (-SH) groups on proteins, peptides, and other biomolecules, forming stable thioether bonds for site-specific labeling. This dye features high quantum yield, narrow emission peak, and excellent photostability. Its far-red emission reduces interference from biological autofluorescence, making it widely used for protein labeling, cellular imaging, and multichannel fluorescence analysis.

Chromoionophore I (ETH 5294), a hydrophobic pH indicator, functions as a transmissive or fluorescent probe molecule in various hydrophobic sensor membranes. It is oil-soluble [1].

Janelia Fluor® 646 TFA (JF646 TFA) is a red fluorogenic dye used in the synthesis of HaloTag and SNAP-Tag ligands for Janelia Fluor 646, and in live cell imaging applications [1] [2].

BDP 630/650 amine is a far-red luminescent boron dipyridyl fluorophore (λex=630 nm, λem=650 nm) used for labeling various electrophilic compounds.

BDP 630/650 tetrazine is a boron-dipyrromethene (BODIPY) dye that includes a terminal tetrazine group.

610CP is a fluorescent probe for near-IR live-cell super-resolution imaging.

Janelia Fluor® 646, Maleimide (JF646, Maleimide), is a red fluorescent dye containing a maleimide group, suitable for cellular imaging [1] [2].

Rhodamine 101 chloride is a fluorescent dye with excitation/emission wavelengths of 565/595 nm, serving as a reference standard for fluorescence quantum yield measurements.

BDP 630/650 lipid stain is a vibrant and photostable far-red fluorophore, characterized by its high molar extinction coefficient and high quantum yield.