Imprinted propyl gallate electrochemical sensor based on graphene/single walled carbon nanotubes/sol–gel film

•A imprinted sol–gel electrochemical sensor for the determination of PG was developed.•The sensor was fabricated by stepwise modifying GR-SWCNTs and MIPs.•The sensor exhibited specificity and selectivity towards PG.•The sensor could determine PG in real samples with satisfactory recovery. A novel im...

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Bibliographic Details
Published in:Food chemistry 2015-06, Vol.177, p.37-42
Main Authors: Xu, Guilin, Chi, Yu, Li, Lu, Liu, Shouhua, Kan, Xianwen
Format: Article
Language:English
Subjects:
Biosensing Techniques - methods
Electrochemical Techniques - methods
Food Safety
Gallates
Graphene
Graphite - chemistry
Imprinted sol–gel electrochemical sensor
Morphology
Nanotubes, Carbon - chemistry
Phosphates
Polymers - chemistry
Propyl gallate
Propyl Gallate - chemistry
Scanning electron microscopy
Sensors
Single wall carbon nanotubes
Single walled carbon nanotubes
Sol gel process
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Summary:•A imprinted sol–gel electrochemical sensor for the determination of PG was developed.•The sensor was fabricated by stepwise modifying GR-SWCNTs and MIPs.•The sensor exhibited specificity and selectivity towards PG.•The sensor could determine PG in real samples with satisfactory recovery. A novel imprinted sol–gel electrochemical sensor for the determination of propyl gallate (PG) was developed based on a composite of graphene and single walled carbon nanotubes (GR-SWCNTs). It was fabricated by stepwise modifying GR-SWCNTs and molecularly imprinted polymers and stored in 0.10molL−1 phosphate buffer solution pH 6.0, which endowed the sensor good sensitivity and selective recognition towards template molecules. The morphology and specific adsorption capacity of the sensor was characterized by scanning electron microscope and electrochemical methods, respectively. Under the optimized conditions, a linear range of the sensor to PG was 8.0×10−8–2.6×10−3molL−1 with a limit of detection of 5.0×10−8molL−1 (S/N=3). The sensor exhibited specificity and selectivity towards template molecules as well as excellent reproducibility, regeneration and stability. Furthermore, the sensor could be applied to determine PG in edible oils, instant noodles and cookies with satisfactory results.
ISSN:0308-8146
1873-7072
DOI:10.1016/j.foodchem.2014.12.097