isosbestic point

(redirected from isosbestic points)
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isosbestic point

[‚ī·səs‚bes·tik ′point]
(physical chemistry)
During a chemical reaction, a point in the absorption spectrum (that is, a wavelength) where at least two chemical species (for example, reactant and product) have identical molar absorption coefficients, which remain constant as the reaction proceeds. A stable isosbestic point is evidence that a reaction is proceeding without forming an intermediate or multiple products.
References in periodicals archive ?
Fortunately, techniques such as those disclosed above can overcome this limitation because oxy- and deoxyhemoglobin have numerous isosbestic points in the visible spectral range, allowing blood vessels to be imaged with visible light.