NGHIÊN CỨU CHẾ TẠO ĐIỆN CỰC GLASSY CARBON BIẾN TÍNH BẰNG GRAPHENE OXIDE DẠNG KHỬ VÀ ỨNG DỤNG PHÂN TÍCH AMARANTH TRONG MẪU KẸO BẰNG PHƯƠNG PHÁP VON-AMPE

Tóm tắt

The glassy carbon electrode modified with reduced graphene oxide (ErGO/GCE) was fabricated by
electrochemical reduction using cyclic voltammetry with conditions: graphene oxide 1 mg/mL, pH = 7:
potential range from -1.5 V to 0 V. The ErGO/GCE was applied to determine amaranth in food with optimal
conditions such as Britton-Robinson buffer pH 3.0, adsorption potential 0 V, adsorption time 30 s, scan
rate 20 mV/s, linearity range from 1×10-7 mol. L-1
to 1×10-6 mol. L-1
, limit of detection 3×10-8 mol. L-1 and
limit of quantification 10×10-8 mol. L-1
. The proposed method was applied to determine amaranth in candy
samples