Maybe you want to consider the original SBF solution; also called c-SBF; it is a TRIS-HCl pH-buffered solution (pH = 7.40 at 37 ºC), that can be commercially acquired, or prepared as indicated at Table 5.1 (p. 206) of next reference: https://www.researchgate.net/publication/231157960_Cristalizacao_de_Biomateriais_Vitroceramicos_e_Mineralizacao_em_Meio_Fisiologico_Simulado?ev=post

Thesis Cristalização de Biomateriais Vitrocerâmicos e Mineralização...