Peptides MEX / Glossary
UV-Visible spectroscopy: absorbance, wavelength and concentration
An optical measurement describes interaction with light; its meaning depends on how the assay was performed.
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What absorbance represents
UV-Visible spectroscopy examines absorption of ultraviolet and visible light. Under suitable conditions, the Beer-Lambert relationship connects absorbance, concentration and optical path length. The relationship depends on substance and wavelength; an isolated reading cannot identify every mixture.
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Spectrum versus chromatographic signal
A UV-Visible spectrum relates response to wavelength. In HPLC with UV detection, a chromatogram records signal during separation at one or more wavelengths. These are different representations; preserve that variable when comparing plots.
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Questions about this reference
Does greater absorbance always mean greater purity?
No. It may reflect concentration or other absorbing components; purity requires an analysis with a defined purpose.
Sources and original reading
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