Determination of organic acids in Vaccinium berry standard reference materials |
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Authors: | Melissa M Phillips Ryan J Case Catherine A Rimmer Lane C Sander Katherine E Sharpless Stephen A Wise James H Yen |
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Institution: | (1) Analytical Chemistry Division, Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA;(2) Statistical Engineering Division, Information Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA |
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Abstract: | Nine organic acids (citric acid, galacturonic acid, glycolic acid, isocitric acid, malic acid, oxalic acid, quinic acid, shikimic
acid, and tartaric acid) and two anions (phosphate and sulfate) were determined in a suite of Vaccinium berry-containing dietary supplement standard reference materials (SRMs). Following solvent extraction, three independent
methods were utilized in the quantification of these compounds. The first method involved reversed-phase liquid chromatography
with ultraviolet absorbance detection at 210 nm and isotope dilution mass spectrometry. The second method utilized ion chromatography
with conductivity detection. Finally, gas chromatography with isotope dilution mass spectrometry detection was used following
derivatization with N-methyl-N-trifluoroacetamide (MSTFA). The combined data from these methods was used for the assignment of organic acid levels in the
seven candidate SRMs. |
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