Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 55, Issue 10, Pages 3869-3876Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf070261t
Keywords
Sudan I; molecular imprinting; sol-gel; on-line solid-phase extraction; high-performance liquid chromatography
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A highly selective imprinted polymer was synthesized by a surface molecular imprinting technique in combination with a sol-gel process. The imprinted polymer was evaluated by FT-IR and static and kinetic adsorption experiments. The results showed that the imprinted sorbent exhibited good recognition and selective ability, offered a faster kinetics for the adsorption and desorption of Sudan I than the non-imprinted sorbent, a saturated binding capacity (Q(max)) that reached 33.47 mg g(-1). The prepared sorbent was applied for the determination of trace Sudan I through on-line solid-phase coupled with high-performance liquid chromatography (SPE-HPLC). With a loading flow rate of 1.5 mL min(-1) for sampling 50 mL, an enrichment factor of 1266 was achieved. The detection limit (S/N = 3) was 1.2 ng L-1, and the peak area precision (RSD) for five replicate detections of 0.01 mu g L-1 Sudan I was 3.66%. The Sudan I in the chilli powder from the local market was determined at three levels (0.25, 0.5, and 1.0 ng g(-1)) with recoveries ranging from 80.31 to 94.02%.
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