Table 4: Rheological properties, density, , and of foams obtained using a continuous procedure (, , and ).

Initial formulationRheological propertiesDensity (kg m-3) (μm)
(Pa·sn)

CS/WPI0.62 ± 0.0210.0 ± 0.83820.97
CS/WPI/SiO20.53 ± 0.0111.93 ± 0.312981.00
CS/WPI/HAp0.55 ± 0.0216.12 ± 1.24020.9364.25 ± 0.04
CS/WPI/SiO2/HAp0.61 ± 0.048.18 ± 1.423291.0070.24 ± 0.01

CS: chitosan; WPI: whey protein isolate; HAp: hydroxyapatite; n: flow behaviour index; k: consistency index; Eff: foaming efficacy; d32: bubble size; L: liquid flow rate; G: gas flow rate and N: rotating speed. Each assay was done in triplicate, and data are expressed as means (± standard deviation) or as average value.