Layer-by-Layer films containing immobilized phytase to detect phytic acid - Moraes, Marli L.; Souza, Nara C. de; Oliveira Junior, Osvaldo Novais de; Rodrigues Filho, Ubirajara Pereira; Ferreira, Marystela (International Symposium on Advanced Materials and Nanostructures - ISAMN, 2009)