| 摘要 |
A method of preparing an aqueous sample for use in an analytical process, the sample comprising at least one water-soluble analyte derived from a foodstuff, the method comprising the steps of: (a) providing a solid-phase extraction cartridge comprising first and second sorbent materials arranged to absorb thereon different respective chemical components, the cartridge comprising a chamber containing the first and second sorbent materials and having an inlet and an outlet; (b) flowing through the inlet an aqueous sample comprising at least one water-soluble analyte derived from a foodstuff and impurities, thereby to dispose the sample within at least one of the first and second sorbent materials; (c) flowing through the inlet a washing liquid so as at least partially to separate the at least one water-soluble analyte and the impurities within the first and second sorbent materials; and (d) eluting the at least one water-soluble analyte from the outlet of the cartridge by flowing an elution liquid into the inlet.
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