SENSORS AND ACTUATORS B-CHEMICAL
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2019
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IF 6.393
Fangjing Mo,Jingling Wu,Min Chen,Hui Meng,Qian Han,Yingzi Fu
MicroRNAs (miRNAs) assay is of great significance for early diagnosis of diseases, so an enzyme-free “on-off-on” PEC biosensor has been developed for sensitive miRNA 141 determination. Manganese-doped cadmium sulfide coupled with zinc sulfide quantum dots (Mn: [email protected] QDs) and manganese porphyrin (MnPP) have been used as photoelectric material and photosensitizer, respectively. And a high photocurrent of approximately 70.0 μA has been obtained. Cascaded quadratic amplification strategy has been applied in the system. Mn: [email protected] QDs was characterized by transmission electron microscopy (TEM), scanning electron microscope (SEM), X-ray photoelectron spectrum (XPS) and energy dispersive X-ray spectroscopy (EDX). Photoelectrochemical and electrochemical technologies were used to monitor the fabrication process of the biosensor. The sensing platform exhibits recommendable stability and good selectivity, miRNA 141 can be accurately quantified with a linear range of 1.00 × 10 −14 to 1.00 × 10 -8 mol·L -1 and the detection limit of 3.30 fmol·L -1 . This method provides promising potential to explore sensitive detection models for various biological molecules.
研究领域:
生物技术
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医学诊断
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
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2018
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IF 8.173
Jing Lu,Lin Wu,Yufang Hu,Sui Wang,Zhiyong Guo
In this study, a novel electrochemiluminescence (ECL) biosensor for sensitive detection of femtomolar miRNA-141 was constructed on the basis of Faraday cage-type strategy via graphene oxide (GO) and hybridization chain reaction (HCR)-assisted cascade amplification. A capture probe (CP) was immobilized on Fe 3 O 4 @SiO 2 @Au nanoparticles as capture unit, which could catch the miRNA-141, and the immobilization of the signal unit (Ru(phen) 3 2+ -HCR/GO) was allowed via nucleic acid hybridization. The prepared biosensor exhibited two advantages for signal amplification : firstly, GO could lap on the electrode surface directly, extending Outer Helmholtz Plane (OHP) of the sensor due to the large surface area and good electronic transport property; secondly, HCR-assisted cascade amplification was designed by anchoring all HCR products on the GO surface, then embedding Ru(phen) 3 2+ as a signal readout pathway. All these signal molecules could take part in electrochemical reactions , thus further enhancing the ECL signal drastically. Therefore, the proposed sensor constructed by integrating HCR with Faraday cage-type strategy displayed an ultrasensitive detection platform for the miRNA-141 with a low detection limit of 0.03 fM. In addition, this proposed biosensor provides a universal platform for analysis of other microRNAs.
研究领域:
生物传感器技术
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分子诊断学
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纳米生物学
✓ 已验证
DOI
PubMed
高影响因子
Nanoscale
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2025
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IF 5.1
Beibei Zhang,Xinyi Wang,Min Pan,Xinhao Li,Hong Wang,Yingwei Zhang
In this study, a novel dual-switch fluorescent biosensor based on a bipedal DNAzyme walker was developed for the highly sensitive detection of the tumour biomarker miRNA-141. By exploiting the typically elevated expression levels of miRNA-141 and apurinic/apyrimidinic endonuclease 1 (APE1) in tumour cells, an endogenous dual-gating system was constructed. The presence of both targets was required to initiate an enzyme-free strand displacement reaction, enabling target recycling and the subsequent release of bipedal DNAzyme walker components (D1/D2), which were efficiently isolated using streptavidin-modified magnetic beads. In the presence of Mg2+, the activated DNAzyme walker specifically cleaved fluorophore-labelled substrate strands on gold nanoparticles (AuNPs). Through repeated“walking–cleavage”cycles, fluorescence signals were progressively restored and amplified. By integrating AuNPs as carriers and magnetic separation technology, a cascade dual-amplification system based on non-enzymatic strand displacement and bipedal DNAzyme walking was established, markedly enhancing the detection sensitivity. The biosensor exhibited dual-switch-specific activation, effectively suppressing interference from non-target RNAs and other nucleases, and maintained a low background signal. It demonstrated excellent discrimination between tumour cells and normal cells, and showed good anti-interference performance in spiked serum samples. This study provides a new strategy for the development of high-precision tumour biomarker detection, offering potential for trace analysis in complex biological samples.
研究领域:
生物传感器
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分子诊断
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核酸化学
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肿瘤标志物
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Lei Liu,Yue Yao,Kejian Ma,Changjian Shangguan,Songlong Jiao,Songyang Zhu,Xiaoxuan Xu
Elucidation of the photoelectrochemical (PEC) detection mechanism and exploring highly efficient photoactive materials hold both a challenge and an opportunity to construct high-performance biosensors. In this work, we present a strategy to enhance the charge separation efficiency by fabricating hierarchical Ti 3 C 2 @ReS 2 via the vertical anchoring flaky ReS 2 on the Ti 3 C 2 backbone. According to the experimental results, the Ti 3 C 2 @ReS 2 sample containing 45 wt % of ReS 2 exhibits a 2.48-time promotion in the photocurrent as compared to ReS 2 owing to the synergistic effects of its photoactive and conductive counterparts, indicating its significant advantages in separating photo-induced carriers and suppressing carrier recombination. In essence, the Ti 3 C 2 @ReS 2 Schottky junction formed at the interface can capture the photogenerated electrons generated by ReS 2 , thereby suppressing carrier recombination. As a result, an ultrasensitive PEC detection platform based on the optimized Ti 3 C 2 @ReS 2 can offer a log-linear detection window from 0.1 fM to 1 nM with an estimated detection limit of 2.4 aM (S/N = 3) for cancer-related miRNA-141 without any other amplification.
研究领域:
材料科学
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生物传感器
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癌症研究
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光电化学
✓ 已验证
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2024
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IF 3.8
Luo Xianzhun,Dai Qingshan,Qiu Xia,Wang Dongmei,Li Yongxin
As biomarkers of cancer, the accurate and sensitive detection of microRNAs is of great significance. Therefore, we proposed a surface-enhanced Raman scattering (SERS)/electrochemical (EC) dual-mode nanosensor for sensitively detecting miRNA-141. The nanosensor uses Au@Ag nanowires as a novel SERS/EC sensing platform, which has the advantages of good biocompatibility, fast response, and high sensitivity. The dual-mode nanosensor can not only effectively overcome the problem of insufficient reliability of single signal, but also realize the amplification and stable output of the detection signal, to ensure the reliability and repeatability of miRNA detection. With this sensing strategy, the target miRNA-141 can be detected over a wide linear range (100 fM to 50 nM) (LOD of 18.4 fM for SERS and 16.0 fM for electrochemical methods). In addition, the process shows good selectivity and can distinguish miRNA-141 from other interfering miRNAs. The actual analysis of human serum samples also proves that our strategy has good reliability, repeatability, and has broad application prospects in the field of analysis and detection. Graphical Abstract
研究领域:
生物技术
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纳米技术
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分析化学
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癌症研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
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IF 9.221
Jiawei Shen,Tingting Li,Min Wang,Bo Yao
MicroRNAs (miRNAs) are a category of short non-coding RNA molecules which play essential roles in regulating gene expression. Correspondingly, the aberrant expression of miRNAs is commonly related to the development of various diseases including cancers and cardiovascular diseases. Hence, miRNA is considered as an ideal biomarker for disease diagnosis and its quantification is highly demanded. Herein, an isothermal and enzyme-free miRNA assay based on catalytic hairpin assembly (CHA) amplification coupled with inductively coupled plasma mass spectrometry (ICP-MS) detection is proposed. Two hairpin probes are employed in CHA reaction with rare earth element tag on H1 for ICP-MS detection and biotin on H2 for immobilization on magnetic beads. In the presence of target miRNA, the two independent probes open up their stem-loop structure and hybridize. The target miRNA will be released after the hybridization to trigger another CHA reaction. Ultimately, one target miRNA molecule promotes a number of CHA cycles and produces several copies of hybridized complex leading to the enhanced ICP-MS signal. Based on this approach, miRNA-141 was successfully analyzed with high sensitivity and specificity. The limit of detection (LOD) was 88 fmol with a linear range 0.1–2 pmol. Compared with fluorescence mediated CHA method and ICP-MS mediated basic sandwich method, the current strategy displayed the lowest LOD. The developed method was also applied to analyze miRNA-141 and miRNA-21 simultaneously to demonstrate its multiple detecting capability and practical applicability. Furthermore, this miRNA assay has the potential to become a high-throughput method by employing more distinct rare earth elements.
研究领域:
分子生物学
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分析化学
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生物医学工程
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癌症研究
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心血管疾病
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）