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onal group (-COOH) in common amino acids is replaced with a sulfonic acid (-SO3H) group in taurine. The method offers baseline separation of citrulline which is an alpha amino acid generally present in infant formula and adult/pediatric nutritional products. The separation of citrulline eliminates the risk of interference of this compound with other amino acids. The method can also separate and quantitate hydroxyproline, an important component of collagen that is often used to quantitate collagen. The method is simple and does not includ