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2. [Methods and their evaluation in estimating the vitamin B6-status in humans. 3. Determination- of 4-pyridoxic acid in urine]. Simon I, Leinert J, Hötzel D. Int J Vitam Nutr Res; 1982; 52(3):280-6. PubMed ID: 7174226 [Abstract] [Full Text] [Related]
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5. Determination of urinary 4-pyridoxic acid using high performance liquid chromatography. Gregory JF, Kirk JR. Am J Clin Nutr; 1979 Apr; 32(4):879-83. PubMed ID: 433815 [Abstract] [Full Text] [Related]
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11. Comparison of analytical methods for urinary 4-pyridoxic acid. Arend RA, Brown RR. Am J Clin Nutr; 1981 Sep 05; 34(9):1984-5. PubMed ID: 7282625 [No Abstract] [Full Text] [Related]
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