color

Naphthoresorcinol (1,3-Dihydroxynaphthalene) is a fluorescent dye with an excitation wavelength (λex) of 330 nm and an emission wavelength (λem) of 380 nm.

Acid Yellow 36 (Metanil Yellow) is an azo dye and pH indicator, changing color from red at pH 1.2 to yellow at pH 2.3.

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.

Methylene Blue trihydrate (Basic blue 9) is a compound consisting of dark green crystals or crystalline powder, having a bronze-like luster. Solutions in water or alcohol have a deep blue color. Methylene Blue trihydrate is used as a bacteriologic stain and as an indicator. It inhibits soluble guanylyl cyclase and has been used to treat cyanide poisoning and to lower levels of methemoglobin. It also inhibits tau filament formation (IC50: 1.9μM).

Thiazolyl Blue (MTT) is a colorimetric compound extensively utilized to measure cell proliferation, transitioning from a yellow color to purple formazan in living cells.

Alizarin Cyanine Green F (NSC-41838) is an agent of green dye. It can be used to dye paper, chromed leather, wool, silk, and nylon (acid bath), to stain wood, and to color anodized aluminum, urea-melamine resin, and soap. It is used to color nylon 66 and or nylon 6 nonabsorbable surgical sutures for use in general surgery and used for coloring drugs generally, including drugs intended for use in the area of the eye. Alizarin Cyanine Green F is also proposed for use in semi-permanent hair dye formulations as a direct dye at a maximum concentration of 0.3% in the finished cosmetic product.

IR-820 (New Indocyanine Green) is a near-infrared dye with improved stability, good color rendering, and excellent fluorescence penetration. It serves as an infrared blood pool contrast agent for detecting and quantifying diseased tissue in live animals, with maximal excitation (Ex) and emission (Em) of 710 and 820 nm, respectively.

Sudan III (Solvent Red 23) is a solvent dye used to color nonpolar substances.

Fast Green FCF (FD&C Green No. 3), a safe biocompatible color additive, has been suggested to mitigate chronic pain.

NBD-PE is a lipid dye used primarily as a probe to study lipid organisation and dynamics within cell membranes and also to study membrane fusion by fluorescence resonance energy transfer (FRET), Ex=463 nm, Em=536 nm.

C.I. 18760 is a dye in the form of a bluish red powder. Its aqueous solution is yellowish to brownish red, turning reddish orange with dilute sulphuric acid; with concentrated caustic soda it turns brilliant red. In concentrated sulfuric acid is rose red, diluted to orange; in concentrated nitric acid the color disappears. It is used for dyeing and printing of wool, silk and its fabrics, also can dye nylon and its blended fabrics.

Acid blue is a dark bluish synthetic triphenylmethane dye. It used as a food coloring. The color of the dye is pH-dependent. The structure is also redox-sensitive, changing from a reduced yellow form to an oxidized red form in solution. It is usable as a

Bromo-PADAP is a dye agent utilized in research for the spectrophotometric determination of uranium(VI). This compound exhibits high sensitivity to uranium, with a molar absorptivity of its uranyl complex at 74,000 at 578 nm and pH 7.6. In the presence of mixed masking solutions, only a few ions cause significant interference. By initially extracting uranium into trioctylphosphine oxide and subsequently developing the Bromo-PADAP color in the organic phase, the method becomes specifically targeted to uranium. Detailed procedures for the determination of uranium in water, ores, phosphoric acid and phosphate rocks, thorium oxide, and zirconium oxide are provided in the text.

8-Carboxy-1,3,5,7-tetramethyl BODIPY exhibits a high fluorescence quantum yield, with absorption and emission wavelengths situated in a specific spectral region, emitting a particular color of fluorescence. It can serve as a fluorescent probe in the field of bioimaging, allowing for the labeling and tracking of biomolecules and cellular structures.

Desmeninol is an active endogenous metabolite, detected mainly in urine, and in cells located mainly in the cytoplasm and fat bodies. It is used as a catalyst, chlorinating agent, curing agent and stabilizer in organic synthesis. In the dye industry it can be used as a raw material for the production of Disperse Red 343. In medicine, it can be used for the production of oxalazine and so on. It can be used as color regulator for color photographs. It can also be used as fungicide.

Phloxine B is a red dye, the USP grade of which is used as a color additive for food, drugs, and cosmetics. It has also been used as an alternative to Gram staining, to differentiate between Gram-negative and Gram-positive bacteria. At 100 μg ml, it can inhibit methicillin-resistant S. aureus growth in vitro. Phloxine B has also been shown to modulate channel activity of wild-type cystic fibrosis transmembrane conductance regulator chloride channels (CFTR; Ki = 38 μM) and mutant delta F508 CFTR (Ki = 33 μM).

Thymolphthalein monophosphate disodium hydrate serves as a chromogenic substrate for the detection of acid phosphatase and alkaline phosphatase. During the enzymatic reaction, thymolphthalein is liberated which elevates the medium's pH, facilitating easy detection through color production and halts hydrolysis. Additionally, this compound is utilized for the specific identification of prostatic phosphatase in serum [1] [2].

Coelenteramine 400a (Coelenterazine 400a), a Coelenterazine derivative, serves as a substrate for Renilla luciferase (RLuc), facilitating the emission of blue light at 395 nm [1] [2]. This compound alters the bioluminescence color of RLuc by substituting the sulfur and oxygen heteroatoms in the methylene bridge. Coelenteramine 400a enhances signal resolution, proving useful in bioluminescence resonance energy transfer (BRET) research [3].

α-Naphtholbenzein, also known as p-Naphtolbenzein, is a dye that serves as a pH indicator, exhibiting a color change from yellow at a pH of 0-8.2 to turquoise at a pH of 10. It is commonly employed in the sequential injection analysis technique for acid-base titrations [1].

Rose-β-D-Gal, a fluorescent dye, serves as a β-galactosidase substrate, producing a pink magenta color upon reaction that facilitates the detection of β-gal activity [1] [2].

N-Acetyl-DL-phenylalanine β-naphthyl ester is a chromogenic substrate for chymotrypsin and microbial serine proteases like subtilisin [1]. This aromatic amino acid ester exhibits color changes upon enzymatic cleavage, facilitating the monitoring of enzyme activity.

Hydroxy naphthol blue disodium, an azo dye and metal indicator for calcium as well as a colorimetric reagent for alkaline earth metal ions (λmax = 650 nm), exhibits a reddish-pink color in calcium ion solutions at pH 12 to 13 and transitions to deep blue when disodium EDTA is introduced [1].

BETA-1, a twisted intramolecular charge transfer (TICT)-aggregation-induced emission (AIE) integration molecule, exhibits cyan fluorescence in lipid droplets (LDs) and red fluorescence in mitochondria, facilitating the dual-color imaging of these organelles both in vivo and in vitro [1].

4-(4-Nitrophenylazo)resorcinol, also known as Azo Violet, is an azo purple dye used experimentally as a pH indicator, turning yellow below pH 11 and purple above pH 13. It becomes dark blue in slightly alkaline or alkaline environments with magnesium salts and can also test for ammonium ions, with the color changing based on the concentration of Azo Violet in ammonium chloride or ammonium hydroxide solutions.