Table 2.

Coding and composition of factorial batches.

	F1	F2	F3	F4	F5	F6	F7	F8	F9
Coding of variables
X 1 level	−1	0	+1	−1	0	+1	−1	0	+1
X 2 level	−1	−1	−1	0	0	0	+1	+1	+1
Ingredients
AA* (50% v/v) (μL)	500	500	500	500	500	500	500	500	500
Chitosan (1% w/v) (μL)	100	200	300	100	200	300	100	200	300
HPMC† K4M (2% w/v) (μL)	100	100	100	200	200	200	300	300	300
BIS‡ (2.5% w/v) (μL)	100	100	100	100	100	100	100	100	100
TEMED§ (20% v/v) (μL)	25	25	25	25	25	25	25	25	25
APS|| (20% w/v) (μL)	25	25	25	25	25	25	25	25	25
Span 80 (10% v/v) (μL)	30	30	30	30	30	30	30	30	30
DDW¶ (μL)	300	300	300	300	300	300	300	300	300
Sodium bicarbonate (mg)	200	200	200	200	200	200	200	200	200

*AA: acrylic acid; ^†HPMC: hydroxypropylmethyl cellulose; ^‡BIS: N,N′-methylene-bis-acrylamide; ^§TEMED: N,N,N′,N′-tetramethylethylenediamine; ^||APS: ammonium persulfate; ^¶DDW: double distilled water.