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Direct measurement of homovanillic, vanillylmandelic and 5 hydroxyindoleacetic acids in urine by capillary electrophoresis / C Barbas [et al ]

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Fig. 1. Standards mobility vs. pH. Electrolyte buffer: 0.170 M phosphoric acid made up to the corresponding pH with NaOH from pH 8.0 to pH 6.0 and 0.170 M phosphoric acid–0.050 M acetic acid made up to pH with NaOH for pH 5.0 and 4.0
Fig. 2. (A) 0.170 M phosphoric acid and 0.050 M acetic acid made up to the corresponding pH with NaOH
Fig. 4. Effect of methanol addition on VMA peak resolution in urine samples at pH 4.4
Fig. 5. Electropherograms of a pool of urine from 10 healthy people, standards and the same urine pool with the standards added.
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