CHEN Dan,WANG Chun-qiong,ZHANG Ke,RONG Xian-fang,LONG Jie,LI Hai-yan,CAI Jie-yun,CHEN Zhi-chao,CUI Yi-fan,YANG De-zhi,YANG Ya-ling.Detection of Nicotine in Cigarette-like Products Based on the Regulation of Peroxidase-like Activity of F68-Ce-Cu[J].Journal of Instrumental Analysis,2025,44(03):445-453.
CHEN Dan,WANG Chun-qiong,ZHANG Ke,RONG Xian-fang,LONG Jie,LI Hai-yan,CAI Jie-yun,CHEN Zhi-chao,CUI Yi-fan,YANG De-zhi,YANG Ya-ling.Detection of Nicotine in Cigarette-like Products Based on the Regulation of Peroxidase-like Activity of F68-Ce-Cu[J].Journal of Instrumental Analysis,2025,44(03):445-453. DOI: 10.12452/j.fxcsxb.240602104.
Detection of Nicotine in Cigarette-like Products Based on the Regulation of Peroxidase-like Activity of F68-Ce-Cu
Cerium and copper doped nanozyme(F68-Ce-Cu) with peroxidase-like activity was prepared for the colorimetric analysis of nicotine in “tea tobacco” and “flower tobacco”. In the presence of H
2
O
2
,F68-Ce-Cu could catalyze the conversion of colorless 3,3',5,5'-tetramethylbenzidine(TMB) into blue oxidized TMB(oxTMB). It had been found that nicotine has a significant sensitizing effect on the peroxidase-like activity of F68-Ce-Cu without interference from other possible components in cigarette-like products. The results of the Michaelis-Menten kinetics study showed that compared to the Ce(
K
m
=2.04 mmol/L) or Cu(
K
m
=9.46 mmol/L) based-nanozyme alone,the
K
m
of F68-Ce-Cu was significantly reduced(
K
m
=1.51 mmol/L),and the
K
m
of “F68-Ce-Cu+nicotine” system was 0.25 mmol/L,which was 6 times more strongly bound to the substrate after the addition of natural nicotine. The results of Zeta potential determination showed that there was a strong adsorption between F68-Ce-Cu and nicotine,and it could promote the production of more ·OH and O
2
·-
,which significantly increased the peroxidase-like activity. In the range of 0.017-0.52 mg/mL,nicotine concentration showed a good linear relationship with absorbance at 654 nm,and the detection limit reached 0.008 mg/mL. In the actual cigarette-like products,the recovery of the method was in the range of 90.9%-103%,and the relative standard deviation was in the range of 2.1%-4.6%,which was almost consistent with the detection results of high performance liquid chromatography,indicating that the method was stable a
nd accurate.
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Keywords
references
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