2. Material and methods
2.1. Materials
Fresh okras were sourced from the Selangor region in Malaysia.
Nylon cloth (500 mm) was used for filtration. Kaolin slurry without
chemical treatments and purification was purchased from Kaolin
Malaysia Sdn. Bhd and stored at room temperature in plastic containers.
The cationic (FO 4400 SH) and anionic (AN 934 SH)polyacrylamides with 30% charge density and 1.5 107 g/mol were
purchased from SNF Floerger dealer (KemPro Sdn. Bhd.) in
Malaysia.