unsaturation index

initialism: UI
https://doi.org/10.1351/goldbook.09864
Measure of the number of double bonds in fatty acids moieties of phospholipids, calculated as the fraction of each unsaturated fatty acid multiplied by the number of double bonds within that fatty acid.
Note: UI is indicative of membrane physical properties (e.g. fluidity, curvature, or flexibility).
Source:
PAC, 2018, 90, 1121. (Terminology of bioanalytical methods (IUPAC Recommendations 2018)) on page 1182 [Terms] [Paper]
Citation: 'unsaturation index' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.09864 RIS BibTex EndNote
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