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Bromocresol green (BCG) is a dye of the triphenylmethane family (triarylmethane dyes). It belongs to a class of dyes called sulfonephthaleins. [4] It is used as a pH indicator in applications such as growth mediums for microorganisms and titrations. In clinical practise, it is commonly used as a diagnostic technique.
Absorption spectra of bromocresol green at different stages of protonation. An indicator may be used to obtain quite precise measurements of pH by measuring absorbance quantitatively at two or more wavelengths. The principle can be illustrated by taking the indicator to be a simple acid, HA, which dissociates into H + and A −. HA ⇌ H + + A −
The general carbon skeleton of bromothymol blue is common to many indicators including chlorophenol red, thymol blue, and bromocresol green. [ 2 ] The presence of one moderate electron-withdrawing group ( bromine atom) and two moderate donating groups (alkyl substituents) are responsible for bromothymol blue's active indication range from a pH ...
Triphenylmethane or triphenyl methane (sometimes also known as Tritan), is the hydrocarbon with the formula (C 6 H 5) 3 CH. This colorless solid is soluble in nonpolar organic solvents and not in water. Triphenylmethane is the basic skeleton of many synthetic dyes called triarylmethane dyes, many of them are pH indicators, and some display ...
Brilliant green: Malachite green G Zeylonka Basic green 1 42040 triarylmethane 633-03-4: Bromsulfthalein: BSP triarylmethane 71-67-0: Bromocresol green: BCG triarylmethane 76-60-8: Bromocresol purple: BCP triarylmethane 115-40-2: Bromodeoxyuridine: BDU 59-14-3: Bromophenol blue: BPB Albutest triarylmethane 115-39-9: Bromopyrogallol red ...
Isosbestic point in the bromocresol green spectrum. The spectra of basic, acid and intermediate pH solutions are shown. The analytical concentration of the dye is the same in all solutions.
These indicators are essential tools in chemistry and biology, ... Bromocresol Green Yellow 3.8 - 5.6 ... Thus pH can be calculated using the following formula: [1]
Phthalein dyes are a class of dyes mainly used as pH indicators, due to their ability to change colors depending on pH. [1] They are formed by the reaction of phthalic anhydride with various phenols. They are a subclass of triarylmethane dyes. Common phthalein dyes include: Bromothymol blue; Bromocresol green; Bromocresol purple; Cresol Red; o ...