Table 1 Single factor test design

Single factor experiment	Fixed factor	Influence factor
1	The concentration of chitosan: 1.5%;The concentration of sodium alginate: 1.5%	The concentration of lysozyme:0.02, 0.04, 0.06, 0.08, 0.10%
2	The concentration of chitosan: 1.5%;The concentration of lysozyme: 0.08%	The concentration of sodium alginate:0.5, 1.0, 1.5, 2.0, 2.5%
3	The concentration of sodium alginate: 1.5%;The concentration of lysozyme: 0.08%	The concentration of chitosan:0.5, 1.0, 1.5, 2.0, 2.5%