Cyclohexanone

Selectophore grade sodium ionophore X, bis(2-ethylehexyl) sebacate (DOS), sodium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (Na-TFPB), high–molecular weight polyvinyl chloride (PVC), tetrahydrofuran, valinomycin (potassium ionophore), sodium tetraphenylborate (NaTPB), cyclohexanone, polyvinyl butyral resin BUTVAR B-98 (PVB), 3,4-ethoxylenedioxythiophene (EDOT), NaPSS, glucose oxidase (from Aspergillus niger), l-lactate oxidase (>80 activity units/mg), AA, UA, lactate, and glucose were purchased from J&K Scientific. Chitosan, acetic acid, disodium hydrogen phosphate (Na₂HPO₄), potassium dihydrogen phosphate (KH₂PO₄), sodium chloride (NaCl), potassium chloride (KCl), potassium ferricyanide (III), and potassium ferricyanide (II) were obtained from Sigma-Aldrich. All other chemicals (analytical reagent grade) were commercially available and used without further purification. All solutions were prepared using deionized water (18.3 megohm·cm) produced from a Millipore water purification system.

1-Propylimidazole (98%) was purchased from Energy Chemical. 1-Bromopropane (99%), 1-bromohexane (≥98%), 1-bromododecane (99%) and 1-bromohexadecane (99%) were purchased from Sinopharm Chemical Reagent Beijing Co. Ltd. Absolute ether, hydrochloric acid, hydrogen nitrate, Na₂CO₃ NaOH, and AgNO₃ were analytically pure and purchased from Beijing Chemical Works. Anion exchange resin, 2-aminobenzonitrile and cyclohexanone were purchased from J&K Scientific Ltd. Water used was distilled water.