2.2 Formulation of A-SA-Gel hydrogel
According to previous research [12], first, the 5% (w/v) SA and 10% (w/v) Gel solution was made in deionized water followed by mixing both of them at the volume ratio of 1:1. Secondly, the albumin was added and gently mixed with the SA/Gel solution at the volume ratio of 1:5 in order to get the A-SA-Gel hydrogel. Finally, the hydrogel was stirred constantly until free from air bubbles and stored in refrigerator (4-10℃) for further use.