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. 2013 Aug 4;2013:563651. doi: 10.1155/2013/563651

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.