Ищу статью Journal of Chromatography A

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Analyte: choline chloride; matrix: blood (plasma); procedure: high-performance liquid chromatography with ultraviolet detection at 254 nm; limit of quantitation: 1 nmole/mL

[Buchanan DN et al; J Chromatogr 181: 329-335 (1980). As cited in: Lunn G; HPLC and CE Methods for Pharmaceutical Analysis. CD-ROM. New York, NY: John Wiley & Sons (2000)]

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http://www.sciencedirect.com/science/article/pii/S0378434700811354