Meaning of isosbestic point in English:

isosbestic point

Pronunciation /ˌʌɪsə(ʊ)sˈbɛstɪk/


  • A wavelength at which the absorption of light by a mixed solution remains constant as the equilibrium between the components in the solution changes.

    ‘Once the absorptivities of the component species become dependent on the external variables, isosbestic points do not occur.’
    • ‘On the contrary, for FP the absence of isosbestic points is indicative of parallel or consecutive reaction channels leading to more than one photoproduct.’
    • ‘The difference spectrum has an isosbestic point at 538 nm, maximum at 500 run and minimum at 586 nm.’
    • ‘The isosbestic point of the transition is at 404 nm.’
    • ‘This is supported by the finding that the two bands exhibit an isosbestic point, if the spectra are corrected for their temperature dependence.’


Early 20th century isosbestic from iso-‘equal’ + Greek sbestos ‘extinguished’ (from sbennunai ‘quench’) + -ic.