Determination of amino acids, urea and ammonium ion in tiquira by a spectrophotometric method - Andrade Sobrinho, Luiz Gualberto de; Boscolo, Maurício; Polastro, Lisanias Ribeiro; Marques, Edmar Pereira; Lima Neto, Benedito dos Santos; Franco, Douglas Wagner (Brazilian Meeting on Chemistry of Food and Beverages, 1999)