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- W2034992308 abstract "A trace enrichment technique is described that permits the use of large injection volumes of up to several millilitres. Some of the parameters were studid with ergot alkaloids. An application of this method to urine samples containing ergot alkaloids and peptides demonstrated the feasibility of the application of this technique to complex matrices. Considerable enhancement of sensitivity and selectivity can be achieved by coupling trace enrichment with step-gradient elution and with post-column derivatization techniques. The latter effect was studied with a nonapeptide. The reproducibility of these techniques when applied to quantitations is usually below 4% (relative standard deviation) and is further enhanced (2–3%) by using a timer-controlled valve and a continuous-displacement pumping device for injection of very large volumes (“>” 2 ml)." @default.
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- W2034992308 date "1977-06-01" @default.
- W2034992308 modified "2023-10-14" @default.
- W2034992308 title "Trace enrichment techniques in reversed-phase high-performance liquid chromatography" @default.
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- W2034992308 doi "https://doi.org/10.1016/s0021-9673(00)82995-7" @default.
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