ArticleMolecules (Basel, Switzerland)2025
Solvent-Driven Enrichment and Multiplex Analysis of Local Anesthetics by Thin-Layer Chromatography Coupled with Surface-Enhanced Raman Spectroscopy.
Article in Molecules (Basel, Switzerland), 2025. 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
Local anesthetics have been widely used in clinical analgesia due to their ability to provide effective regional pain management. Accurate measurement of local anesthetics in body fluids is crucial for ensuring patient medication safety and optimizing therapeutic efficacy. Herein, we present a convenient, economical, sensitive, and efficient TLC-SERS method for multiplex determination of six kinds of anesthetics (pro) in human plasma, including procaine hydrochloride (Pro), tetracaine hydrochloride (Tet), dibucaine (Dib), mepivacaine hydrochloride (Mep), lidocaine hydrochloride (Lid), and ropivacaine hydrochloride (Rop). The TLC method was adopted to separate six local anesthetics effectively. In order to improve the sensitivity, TLC spots were concentrated into smaller ones using methanol through solvent-driven enrichment, then Ag NPs staining was applied to enriched spots for a strong and unique SERS response of each anesthetic. As a result, linear calibration curves of SERS intensity ratio versus negative logarithm of spotting amounts sampled on TLC plates were obtained, along with the lowest detectable amounts in this study were 1 ng (Pro), 10 pg (Tet), 10 ng (Dib), 50 ng (Mep), 50 ng (Lid), and 0.1 μg (Rop), which were up to 2 × 10
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