HPLC Determination of α-keto Acids in Human Serum and Urine after Derivatization with4-Nitro-1,2-phenylenediamine. Pakistan Journal of Analytical & Environmental Chemistry, Pakistan, v. 14, n. 1, p. 16–25, 2025. DOI: 10.21743/. Disponível em: https://pjaec.pk/index.php/pjaec/article/view/359. Acesso em: 5 nov. 2025.