title: Minerals consumption by Acetobacter xylinum on cultivation medium on coconut water.
abstract: The objective of this work is to verifying the consume of the minerals K, Na, Fe, Mg, P, S-SO4 (-2), B, N Total Kjedahl (NTK), NO3 (-)-N, and NH4 (+)-N in the production of bacterial cellulose by Acetobacter xylinum, according to the medium and the manner of cultivation. The fermentative process was in ripe and green coconut water. K and Na were determined by flame emission photometry, Mg and Fe by atomic absorption spectrophotometry, P by molecular absorption spectrophotometry, S-SO4 (-2) by barium sulphate turbidimetry, B by Azomethin-H method, NTK by Kjeldahl method, N-NO3 (-) and N-NH4 (+) by vapor distillation with magnesium oxide and Devarda's alloy, respectively. In Fermentation of ripe coconut water there were higher consumption of K (69%), Fe (84,3%), P (97,4%), S-SO2 (-2) (64,9%), B (56,1%), N-NO3 (-) (94,7%) and N-NH4 (+) (95,2%), whereas coconut water of green fruit the most consumed ions were Na (94,5%), Mg (67,7%) and NTK (56,6%). The cultivation under agitation showed higher mineral consumption. The higher bacterial cellulose production, 6 g.L(-1), was verified in the coconut water fermentative in ripe fruit, added KH2PO4, FeSO4 and NaH2PO4 kept under agitation.
authors.affiliation: Programa de Pós-Graduação em Processos Biotecnológicos, Universidade Federal do Paraná, Curitiba, PR, Brazil. ; Departamentos de Alimentos, Universidade Tecnológica Federal do Paraná, Campus Ponta Grossa, Ponta Grossa, PR, Brazil.
authors.forename: Denise Milleo
authors.initials: DM
authors.lastname: Almeida
authors.forename: Rosilene Aparecida
authors.initials: RA
authors.lastname: Prestes
authors.forename: Adriel Ferreira
authors.initials: AF
authors.lastname: da Fonseca
authors.forename: Adenise L
authors.initials: AL
authors.lastname: Woiciechowski
authors.forename: Gilvan
authors.initials: G
authors.lastname: Wosiacki
keywords: Acetobacter xylinum; bacterial cellulose; minerals