(a)
(b)
(c)
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Figure 4: SEM micrographs of the various formulated scaffolds obtained by batch or continuous process (, , and ). (a) CS formulation in the batch process, (b) CS/WPI/HAp formulation in the batch process, (c) CS/WPI/SiO2 formulation in the continuous process, and (d) CS/WPI/SiO2/HAp in the continuous process. CS: chitosan; WPI: whey protein isolate; HAp: hydroxyapatite; : liquid flow rate; : gas flow rate; : rotating speed.