Synthesis and characterization of a molecularly imprinted silica gel sorbent for the on-line determination of trace sudan I in chilli powder through high-performance liquid chromatography

摘要: A highly selective imprinted polymer was synthesized by a surface molecular imprinting technique in combination with sol−gel process. The evaluated FT-IR and static kinetic adsorption experiments. results showed that the sorbent exhibited good recognition ability, offered faster kinetics for desorption of Sudan I than non-imprinted sorbent, saturated binding capacity (Qmax) reached 33.47 mg g-1. prepared applied determination trace through on-line solid-phase coupled high-performance liquid chromatography (SPE-HPLC). With loading flow rate 1.5 mL min-1 sampling 50 mL, an enrichment factor 1266 achieved. detection limit (S/N = 3) 1.2 ng L-1, peak area precision (RSD) five replicate detections 0.01 μg L-1 3.66%. chilli powder from local market determined at three levels (0.25, 0.5, 1.0 g-1) with...