2.1 Materials
The raw materials required to conduct the experiments are mentioned as
follows. The chicken eggs were purchased from a local farm less than 7
days after laying. The surface of the egg was washed in deionized water
and sterilized in ethanol (75%). Then, egg white (EW) was separated
from the yolk, also called as albumin, and used in the preparation of
hydrogels without any further treatment. Sodium alginate (SA), calcium
chloride (CaCl2) and gelatin (Gel) (type A from porcine
skin, 300 blooms) were purchased from Sigma-Aldrich (USA) and used in
same condition as received. The HUVECs were obtained from
Zhongqiaoxinzhou Biotech (China).