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Fritless SPE on‐line coupled to CE with UV and MS detection (SPE‐CE‐UV and SPE‐CE‐MS) was evaluated for the analysis of opioid peptides. A microcartridge of 150 μm id was packed with a C18 sorbent (particle size > 50 μm), which was retained between a short inlet capillary and a separation capillary (50 μm id). Several experimental parameters were optimized by SPE‐CE‐UV using solutions of dynorphin...
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