2 hydroxyethyl cellulose hec

Sugarcane leaves (SL) were obtained from a local sugarcane farm, Buriram, Thailand. Sodium hydroxide (NaOH, 97%) was purchased from KEMAUS (New South Wales, Australia). FeCl₂·4H₂O and FeCl₃·6H₂O were purchased from SIGMA-ALDRICH (St. Louis, MO, USA). 2-Hydroxyethyl cellulose (HEC) was obtained from SIGMA-ALDRICH (St. Louis, MO, USA). Hydrogen peroxide (H₂O₂, 35%) was purchased from ANaPURE (Brightchem Sdn. Bhd., Selangor, Malaysia). Hydrochloric acid solution (HCl, 37%) was obtained from RCI Labscan (Bangkok, Thailand).

Purified zein, KCl, salt (reagent grade), acetic acid (100%, Glacial, Anhydrous), toluene (HPLC grade, Fischer Chemical), hexane (HPLC grade, Fischer Chemical), Tween 20 (Ultrapure, Thermo Scientific), oleic acid (99.0 +%, TCI America) were purchased from Fisher Scientific. Chitosan (75% deacetylated, ACROS Organics), 2-hydroxyethyl cellulose (HEC) and hydroxyethylcellulose ethoxylate, quaternized (HEC +) were purchased from Sigma Aldrich. Tetrahydrofuran (THF, UN2056) was purchased from Caledon Laboratories Ltd. TCE (ACS, 99.5% min) was purchased from Alfa Aesar. Ethanol (anhydrous, commercial alchols) was purchased from Greefield Global Inc. Nile Red (technical grade, 95% pure) and humic acid sodium salt (abbreviated as humic acids, HA) were purchased from Sigma Aldrich. Ottawa sand was purchased from BEI/PECAL (Stake Technology Ltd.). Deionised (DI) water was used in all experiments. The pH of DI water was approximately pH = 6.