Molecularly imprinted photoelectrochemical sensor for fumonisin B1 based on GO-CdS heterojunction

Mao, Lebao; Ji, Kailun; Yao, Lishuang; Xue, Xiaojie; Wen, Wei; Zhang, Xun

doi:10.1016/j.bios.2018.11.040

“…To boost the photo‐to‐current conversion efficiencies and, thus, the sensitivities of MS‐based PEC sensors, a variety of approaches has been proposed toward the incorporation of MS with binary metal oxide semiconductor, ternary metal oxide semiconductors, or carbon nitride . As an excellent charge transport matrix, graphene (G) has been extensively investigated for the construction of heterojunction composites with MS, especially CdS‐G, not only preventing charge carrier trapping but also retarding the electron–hole recombination in these MS. Therefore, the synergism between MS and graphene could endow their hybrids additional advantages for developing high‐performance PEC (bio‐)sensing platforms.…”

Section: Introductionmentioning

confidence: 99%

Direct‐Laser‐Writing of Metal Sulfide‐Graphene Nanocomposite Photoelectrode toward Sensitive Photoelectrochemical Sensing

Ge

¹

,

Qing

²

,

Li

³

et al. 2019

Adv Funct Materials

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Here, a facile approach for the in situ fabrication of metal sulfide (MS)‐graphene (G) nanocomposite, CdS‐G and PbS‐G, on indium−tin oxide (ITO) glass is demonstrated using a simple and scalable direct‐laser‐writing method in ambient air. Through the CO2 laser irradiation of a metal‐complex‐containing polyethersulfone layer on ITO glass, both the crystallization of laser‐induced MS (LIMS) and the formation of laser‐induced graphene (LIG) are synchronously achieved in one step, giving rise to a laser‐induced MS‐G nanocomposite photoelectrode, denoted as LI‐MS‐G@ITO. In such a laser‐scribing process, polyethersulfone not only acts as the carbon source to grow LIG but also provides an in situ source of S2− to produce LIMS with the aids of carbothermic reduction of sulfur element in polyethersulfone. The obtained LI‐MS‐G@ITO inherits the porous network architecture of polyethersulfone‐derived LIG, in which the LIMS nanocrystals uniformly decorate the multilayered graphene sheets with good dispersion, presenting a fast and stable photocurrent response with high reproducibility, which, as a proof‐of‐concept, further facilitates the use of a LI‐CdS‐G@ITO photoanode as an efficient transducer for photoelectrochemical detection of Cu2+ with high sensitivity and selectivity. This work can offer a universal and versatile protocol for the in situ and synchronous fabrication of novel MS‐G nanocomposites for sensitive photoelectrochemical analysis.

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“…A GCE modified with AuNPs and Ru@SiO2 in chitosan (undefined characteristics), was proved as favorable support to produce MIPs generating electrochemiluminescent estimations with a LOD of 0.35 ng/L [142]. In a similar approach, an iridium tin oxide (ITO) electrode modified with CdS quantum dots, chitosan (undefined characteristics) and graphene oxide worked as the UV polymerization area, in which the resulting MIPs were used for photoelectrochemical evaluation of FB1 levels as low as 4.7 ng/L [144]. The application of nanoMIPs in electrochemical measurements (EIS, DPV) allowed the achievement of LODs as low as 21.6 fg/L, which so far is the lowest value reported for FB1 [191].…”

Section: Other Methodsmentioning

confidence: 99%

Aptamer-Based Detection of Fumonisin B1: A Systematic Comparison with Conventional and Other Novel Methods

Mirón-Mérida

¹

,

Gong²,

Goycoolea³

2020

Preprint

1

0

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Mycotoxin contamination is a current issue affecting several crops and processed products worldwide. Among the diverse mycotoxin group, fumonisin B1 (FB1) has become a relevant compound because of its adverse effects in the food chain. Conventional analytical methods previously proposed to quantify FB1 comprise LC-MS, HPLC-FLD and ELISA, while novel approaches integrate different sensing platforms and fluorescently labelled agents in combination with antibodies. Nevertheless, such methods could be expensive, time-consuming and require experience. Aptamers (ssDNA) are promising alternatives to overcome some of the drawbacks of conventional analytical methods, their high affinity through specific aptamer-target binding has been exploited in various designs attaining favorable limits of detection (LOD). So far, two aptamers specific to FB1 have been reported, and their modified and shortened sequences have been explored for a successful target quantification. In this critical review spanning the last eight years, we have conducted a systematic comparison based on principal component analysis of the aptamer-based techniques for FB1, compared with chromatographic, immunological and other analytical methods. We have also conducted an <i>in-silico</i> prediction of the folded structure of both aptamers under their reported conditions. The potential of aptasensors for the future development of highly sensitive FB1 testing methods is emphasized.

show abstract

“…A GCE modified with AuNPs and Ru@SiO2 in chitosan (undefined characteristics), was proved as favorable support to produce MIPs generating electrochemiluminescent estimations with a LOD of 0.35 ng/L [142]. In a similar approach, an iridium tin oxide (ITO) electrode modified with CdS quantum dots, chitosan (undefined characteristics) and graphene oxide worked as the UV polymerization area, in which the resulting MIPs were used for photoelectrochemical evaluation of FB1 levels as low as 4.7 ng/L [144]. The application of nanoMIPs in electrochemical measurements (EIS, DPV) allowed the achievement of LODs as low as 21.6 fg/L, which so far is the lowest value reported for FB1 [191].…”

Section: Other Methodsmentioning

confidence: 99%

Aptamer-Based Detection of Fumonisin B1: A Systematic Comparison with Conventional and Other Novel Methods

Mirón-Mérida¹,

Gong²,

Goycoolea³

2020

Preprint

1

0

View full text Add to dashboard Cite

Mycotoxin contamination is a current issue affecting several crops and processed products worldwide. Among the diverse mycotoxin group, fumonisin B1 (FB1) has become a relevant compound because of its adverse effects in the food chain. Conventional analytical methods previously proposed to quantify FB1 comprise LC-MS, HPLC-FLD and ELISA, while novel approaches integrate different sensing platforms and fluorescently labelled agents in combination with antibodies. Nevertheless, such methods could be expensive, time-consuming and require experience. Aptamers (ssDNA) are promising alternatives to overcome some of the drawbacks of conventional analytical methods, their high affinity through specific aptamer-target binding has been exploited in various designs attaining favorable limits of detection (LOD). So far, two aptamers specific to FB1 have been reported, and their modified and shortened sequences have been explored for a successful target quantification. In this critical review spanning the last eight years, we have conducted a systematic comparison based on principal component analysis of the aptamer-based techniques for FB1, compared with chromatographic, immunological and other analytical methods. We have also conducted an <i>in-silico</i> prediction of the folded structure of both aptamers under their reported conditions. The potential of aptasensors for the future development of highly sensitive FB1 testing methods is emphasized.

show abstract

Molecularly imprinted photoelectrochemical sensor for fumonisin B1 based on GO-CdS heterojunction

Cited by 91 publications

References 41 publications

Direct‐Laser‐Writing of Metal Sulfide‐Graphene Nanocomposite Photoelectrode toward Sensitive Photoelectrochemical Sensing

Direct‐Laser‐Writing of Metal Sulfide‐Graphene Nanocomposite Photoelectrode toward Sensitive Photoelectrochemical Sensing

Aptamer-Based Detection of Fumonisin B1: A Systematic Comparison with Conventional and Other Novel Methods

Aptamer-Based Detection of Fumonisin B1: A Systematic Comparison with Conventional and Other Novel Methods

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