ArticleAnalytical chemistry2026
An LSPR-Based Kinetic Framework for Polyelectrolyte Molecular Weight Determination: A Proof-of-Concept Study.
Article in Analytical chemistry, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Determining the molecular weight of polyelectrolytes remains a persistent challenge because conventional techniques such as size-exclusion chromatography (SEC) often require added salt, calibration against neutral polymers, and complex optimization to overcome chain-column interactions. Here we introduce a kinetics-based method that employs Localized Surface Plasmon Resonance (LSPR) to measure the real-time electrostatic complexation of poly(ethylenimine) (PEI) and poly[1-[4-(3-carboxy-4-hydroxyphenylazo)benzenesulfonamido]-1,2-ethanediyl, sodium salt] (PAZO). By extracting association and dissociation rate constants from concentration-dependent binding transients, we establish a calibration-free approach to determining the number-average molecular weight (
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