Bioscaffold arrays decorated with Ag nanoparticles as a SERS substrate for direct detection of melamine in infant formula

Zhao, Nan; Li, Hefu; Tian, Cunwei; Xie, Yanru; Feng, Zhenbao; Wang, Zongliang; Yan, Xiaobing; Wang, Wenjun; Yu, Huishan

doi:10.1039/c9ra01862j

Cited by 28 publications

(18 citation statements)

References 43 publications

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“…The wings of cicadas are made of spiky, cone-shaped nanopillars [94] and show antibacterial activity [19] that when fabricated by nano-imprint lithography [95] and reactive ion etching [96] present an interesting antibacterial mechanism. When bacteria fall on a cicada wing, they contact the tips of nanopillars and move downwards.…”

Section: Insect-inspired Patternsmentioning

confidence: 99%

Carbon Nanomaterials Modified Biomimetic Dental Implants for Diabetic Patients

et al. 2021

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Dental implants are used broadly in dental clinics as the most natural-looking restoration option for replacing missing or highly diseased teeth. However, dental implant failure is a crucial issue for diabetic patients in need of dentition restoration, particularly when a lack of osseointegration and immunoregulatory incompetency occur during the healing phase, resulting in infection and fibrous encapsulation. Bio-inspired or biomimetic materials, which can mimic the characteristics of natural elements, are being investigated for use in the implant industry. This review discusses different biomimetic dental implants in terms of structural changes that enable antibacterial properties, drug delivery, immunomodulation, and osseointegration. We subsequently summarize the modification of dental implants for diabetes patients utilizing carbon nanomaterials, which have been recently found to improve the characteristics of biomimetic dental implants, including through antibacterial and anti-inflammatory capabilities, and by offering drug delivery properties that are essential for the success of dental implants.

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Section: Insect-inspired Patternsmentioning

confidence: 99%

Carbon Nanomaterials Modified Biomimetic Dental Implants for Diabetic Patients

et al. 2021

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“…Prevailing conventional methods, including gas chromatography/mass spectrometry (GC/MS) [18], liquid chromatography−mass spectrometry (LC-MS) [20], enzyme-linked immunosorbent assay (ELISA) [21], and surface-enhanced Raman scattering (SERS) [22], are sensitive and selective but make use of cumbersome laboratory equipment with a high operating cost and need skilled operators and time-consuming pre-concentration procedures, reflecting their inaptness, thus creating a developmental bottleneck toward on-site applicability. Alternatively, colorimetric sensing offers low cost, easy fabrication, portability, and concentration-dependent real-time naked eye recognition, which makes it attractive for on-site analysis, Table S1.…”

Section: Introductionmentioning

confidence: 99%

Picomolar-Level Melamine Detection via ATP Regulated CeO2 Nanorods Tunable Peroxidase-Like Nanozyme-Activity-Based Colorimetric Sensor: Logic Gate Implementation and Real Sample Analysis

et al. 2021

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The capability of functional logic operations is highly intriguing, but far from being realized owing to limited recognition element (RE) and complex readout signals, which limit their applications. In this contribution, for a visual colorimetric sensor for melamine (MEL) we described the construction of two- and three-input AND logic gate by exploiting the intrinsic peroxidase (POD)-like activity of CeO2 nanorods (NRs) (~23.04% Ce3+ fraction and aspect ratio (RTEM) of 3.85 ± 0.18) as RE at acidic pH (4.5). Further ATP piloted catalytic tuning of POD-like activity in CeO2 NRs employed for a functional logic gate-controlled MEL sensing at neutral pH (7.4). AND logic circuit operated MEL sensing record colorimetric response time of 15 minutes to produce blue color proportionate to MEL concentration. The fabricated nanozyme (CeO2)-based logic gate sensor probe for MEL at pH 4.5 showed a linear response from 0.004 nM to 1.56 nM with a limit of detection (LOD) of 4 pM; while translation from acidic to neutral pH (at 7.4) sensor exhibited linear response ranging from 0.2 nM to 3.12 nM with a LOD value of 17 pM. Through CeO2 POD-like nanozyme behavior under acidic and neutral pH, the fabricated logic gate sensor showed high affinity for MEL, generating prominent visual output with picomolar sensitivity, good reproducibility, and stability with relative standard deviation (RSD) <1% and 2%, respectively. A feasibility study in real samples (raw milk and milk powder) showed good recoveries with negligible matrix effect, an anti-interference experiment revealed sensor selectivity, highlighting robust sensor practical utility. With the merits of high sensitivity, specificity, low cost, and simplified sample processing, the developed logic-controlled colorimetric MEL sensing platform with appropriate modifications can be recognized as a potent methodology for on-site analysis of various food adulterants and related applications.

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“…Some mainstream optical detection methods, for example SERS, are used for chemical and biological sensing based on the localized surface plasmon resonance (LSPR) effect of metallic nanoparticles, such as Au NPs, Ag NPs, − and Au@Ag NPs . In addition, the colorimetric detection method has been applied widely in environment detection via the change of visible color based on LSPR by using precious metal nanomaterials, including Au NPs, Ag NPs, and so on.…”

Section: Introductionmentioning

confidence: 99%

Dual-Mode Optical Nanosensor Based on Gold Nanoparticles and Carbon Dots for Visible Detection of As(III) in Water

Yang

Ruan

et al. 2020

ACS Appl. Nano Mater.

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To eliminate the occurrence of false positives and improve the accuracy of measurement results in the process of environmental detection, a single-switch dual-mode nanosensing method should be developed for real-time and in situ detection. Herein, we constructed a colorimetric and fluorescent dual-mode optical nanosensor for accurate detection of As(III) in water. The nanosensor consisted of trithiocyanuric acid modified gold nanoparticles (TMT-Au NPs) and amino-functionalized carbon dots (NCDs). When TMT-Au NPs were injected into the NCDs solutions, the fluorescence of NCDs was weakened due to the overlap of the UV−vis absorption peak of TMT-Au NPs and emission peak of NCDs based on an internal filtering effect. With the addition of As(III), the coordination of As(III) with sulfhydryl groups of TMT-Au NPs occurred, causing the aggregation of TMT-Au NPs for colorimetric detection based on local surface plasmon resonance with a limit of detection (LOD) of 0.87 ppb. Meanwhile, the fluorescence of the NCDs was recovered during the aggregation process of TMT-Au NPs for fluorescence detection with an LOD as low as 0.66 ppb. The reported dual-mode optical nanosensor will be widely used in the field of environmental water detection.

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Bioscaffold arrays decorated with Ag nanoparticles as a SERS substrate for direct detection of melamine in infant formula

Cited by 28 publications

References 43 publications

Carbon Nanomaterials Modified Biomimetic Dental Implants for Diabetic Patients

Carbon Nanomaterials Modified Biomimetic Dental Implants for Diabetic Patients

Picomolar-Level Melamine Detection via ATP Regulated CeO2 Nanorods Tunable Peroxidase-Like Nanozyme-Activity-Based Colorimetric Sensor: Logic Gate Implementation and Real Sample Analysis

Dual-Mode Optical Nanosensor Based on Gold Nanoparticles and Carbon Dots for Visible Detection of As(III) in Water

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