Table 2: Density, rheological properties, and surface tension of raw materials.

SampleDensity (kg m-3)Rheological propertiesSurface tension (N m-1)
(Pa·sn) (Pa·s)

CS 2% ()9470.145
WPI 2% ()9980.047
CS/WPI9580.724
CS/WPI/SiO28620.464
CS/WPI/HAp9540.720n.d.
CS/WPI/SiO2/HAp8750.553n.d.

CS: chitosan; WPI: whey protein isolate; HAp: hydroxyapatite; n.d.: none determined; : flow behaviour index; : consistency index; : fluid viscosity. Each assay was done in triplicate, and data are expressed as means (± standard deviation).