SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Yuanhui Ma,Xi Liu,Minjie Yang,Ling Zha,Ying Huang,Dong Sun,Ruizhuo Ouyang,Yuqin Jiang,Yuqing Miao,Baolin Liu
MicroRNA-21 (miRNA-21) is a key oncogenic biomarker for early cancer diagnosis, yet its ultrasensitive detection in serum remains challenging due to limitations of conventional methods such as low sensitivity, high background, and poor biocompatibility. This study develops an electrochemical biosensor for femtomolar miRNA-21 detection by integrating Y-shaped DNA scaffold-enhanced catalytic hairpin assembly (Y-CHA) and Bi@PtAg nanoclusters (NCs). This design achieved an ultra-low detection limit, approximately 2.8-fold lower than that of the conventional sensor. The Y-CHA strategy spatially confines hairpin probes (H1 and H2) within a Y-DNA scaffold, significantly enhancing signal amplification and hybridization efficiency. Meanwhile, the core-shell structured Bi@PtAg NCs exhibit 2.1-fold higher H₂O₂ reduction catalytic activity than monometallic nanoparticles and demonstrate low cytotoxicity (approximately 80% cell viability at 200 μg·mL⁻¹). The biosensor achieves an ultra-low detection limit of 0.05 fM with a wide linear range from 1 fM to 100 pM (R² = 0.9982). It also displays excellent specificity in distinguishing miRNA-21 from mismatched and non-complementary RNAs, good stability (87.1% signal retention after 8 days), and reliable performance in serum samples (93.0–99.7% recovery, RSD < 5%). This study develops a versatile electrochemical biosensing platform for miRNA analysis and disease biomarker detection.
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ANALYTICA CHIMICA ACTA
·
2026
·
IF 6.1
Xiaodong Cao,Mingli Liu,Yifei Pan,Qiuran Wang,Jinying Gong,Yongkang Ye,Yuhan Sun,Zhaojun Wei
Sensitive and simultaneous detection of multiple foodborne pathogens has become an urgent need in the food industry. This work presents a signal-on fluorescence biosensor using DNA-templated metal nanoclusters as signal nanotags and an Exonuclease III (Exo III)-assisted target-recycling (EATR) strategy for the detection of Cronobacter sakazakii ( C. sakazakii ) and Salmonella typhimurium ( S. typhimurium ). The detection system consists of carboxylated polypyrrole nanoparticles functionalized with hairpin DNA sequences HP1 and HP2 (HP1-cPPy-HP2 NPs), the target ompA gene (tDNA1) of C. sakazakii and invA gene (tDNA2) of S. typhimurium , DNA-templated gold and silver nanocluster nanotags (sDNA1-AuNCs and sDNA2-AgNCs), and Exo III. In the presence of the targets, HP1 and HP2 on cPPy surface are opened through hybridization, forming tDNA1-HP1-cPPy-HP2-tDNA2 complex. These opened HP1 and HP2 then hybridize with their respective sDNA1 (sDNA1-AuNCs) and sDNA2 (sDNA2-AgNCs), leading to the increased fluorescence intensity of both AuNCs and AgNCs in the detection system. Furthermore, with EATR amplification strategy, the targets can be released from the complex through cleavage by Exo III and proceed to the next cycle of HP1/HP2 opening. As a result, the fluorescence signals of AuNCs and AgNCs can be significantly increased. Under optimal conditions, the fluorescence biosensor shows wide linear ranges for C. sakazakii (1.64 ∼ 1.64×10 5 CFU mL −1 ) and S. typhimurium (2.56 ∼ 2.56×10 5 CFU mL −1 ), with LODs of 1.4 CFU mL −1 and 2.2 CFU mL −1 , respectively. The biosensor was used for the detection of C. sakazakii and S. typhimurium in real samples, with recovery ranges of 88.8% to 110.6% and 90.4% to 114.4%, respectively.
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POSTHARVEST BIOLOGY AND TECHNOLOGY
·
2025
·
IF 6.8
Siyu Chen,Yiwen Zhang,Shuang Liu,Juan Ma,Huiling Wang,Wei Chang,Hengfeng Li,Xiaochun Ding,Xuejun Pan,Xuewu Duan
DNA methylation is a key epigenetic regulator of gene expression, yet its role in pigment and ascorbic acid (AsA) metabolism in Rosa roxburghii remains unclear. This study examined the effects of 5-azacytidine (5-azaC), a DNA methyltransferase inhibitor, on postharvest fruit quality after cold storage. 5-azaC treatment reduced decay, delayed the onset of color change, preserved overall fruit brightness, maintained firmness, and suppressed respiration during cold storage. It inhibited chlorophyll a degradation and enhanced zeaxanthin, lutein, α-carotene, phytoene, and violaxanthin levels. 5-azaC enhanced AsA content, accompanied by increased activities of monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), glutathione reductase (GR), ascorbate oxidase (AO), and ascorbate peroxidase (APX). Integrated RNA-seq and WGBS analysis showed that 5-azaC induced carotenoid biosynthesis genes ( RrBCH, RrVDE, RrNSY, RrDXS and RrZE P), with RrVDE hypomethylated. RrMDHAR, RrDHAR, RrAO1, RrGR, RrGALUR, RrGalDH and RrIMPL2 were upregulated by 5-azaC, with reduced DNA methylation levels observed in RrAO1, RrGalDH and RrIMPL2 . Transcription factors RrAP2, RrMYB21, RrMYB44 and RrPosF21-like were induced by 5-azaC, with RrMYB21 hypomethylated. DNA demethylases ( RrROS1 and RrROS1-like ) were upregulated, while methyltransferases ( RrCMT-like, RrMET, RrMDR2 and RrDMR2-like ) were downregulated. Silencing RrAP2, RrMYB21, RrMYB44, RrPosF21-like and RrROS1-like reduced AsA content and downregulated AsA metabolism-related genes in R. roxburghii fruit . These findings provide preliminary evidence that 5-azaC may regulate pigment and AsA metabolism via epigenetic mechanisms during cold storage.
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CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2023
·
IF 1.2
Peng WANG,Wen-Heng LI,Xiao-Hong WANG,Dong-Shan XIANG,Kun ZHAI
We developed a new quantitative detection method for trace sulfur ions (S 2− ) in water using a Cu-containing metal–organic framework material (CuBDC) and 6-carboxyfluorescein group (FAM)-labeled DNA of arbitrary sequence. Without S 2− in the system, the FAM-labeled DNA can be adsorbed on the CuBDC surface through π–π stacking, hydrogen bonding, and van der Waals forces, and then the fluorescent dye FAM is near the Cu 2+ on the CuBDC surface, and the fluorescence of FAM is quenched by a photoinduced electron transfer mechanism between Cu 2+ and FAM. With S 2− in the system, S 2− reacts with Cu 2+ in CuBDC to form the more structurally stable compound CuS, leading to CuBDC decomposition, and the FAM-labeled DNA detaches from the CuBDC surface and the fluorescence of FAM recovers. The quantitative detection of S 2− is realized according to the change in FAM fluorescence intensity. Under optimized conditions, a good linear relationship holds between the fluorescence intensity (F i ) of FAM and the concentration ( C i ) of S 2− in the range of 2–120 nmol/L, and the detection limit is 1.5 nmol/L (3 σ, n = 9). The method has good selectivity and accuracy, and it can be applied to rapidly and accurately analyze S 2− in real water samples.
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ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Lu Huang,Hanbing Huang,Zhuomin Zhang,Gongke Li
DNA-mediated self-assembly technology with good sensitivity and affinity ability has been rapidly developed in the field of probe sensing. The efficient and accurate quantification of lactoferrin (Lac) and iron ions (Fe3+) in human serum and milk samples by the probe sensing method can provide useful clues for human health and early diagnosis of anemia. In this paper, contractile hairpin DNA-mediated dual-mode probes of Fe3O4/Ag-ZIF8/graphitic quantum dot (Fe3O4/Ag-ZIF8/GQD) NPs were prepared to realize the simultaneous quantification of Lac by surface-enhanced Raman scattering (SERS) and Fe3+ by fluorescence (FL). In the presence of targets, these dual-mode probes would be triggered by the recognition of aptamer and release GQDs to produce FL response. Meanwhile, the complementary DNA began to shrink and form a new hairpin structure on the surface of Fe3O4/Ag, which produced hot spots and generated a good SERS response. Thus, the proposed dual-mode analytical strategy possessed excellent selectivity, sensitivity, and accuracy due to the dual-mode switchable signals from “off” to “on” in SERS mode and from “on” to “off” in FL mode. Under the optimized conditions, a good linear range was obtained in the range of 0.5–100.0 μg/L for Lac and 0.01–5.0 μmol/L for Fe3+ and with detection limits of 0.14 μg/L and 3.8 nmol/L, respectively. Finally, the contractile hairpin DNA-mediated SERS-FL dual-mode probes were successfully applied in the simultaneous quantification of iron ion and Lac in human serum and milk samples.
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高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Shichao Xu,Hao Duo,Chunming Zheng,Shihuai Zhao,Shidong Song,Gabriel Simon
Diseases caused by typhoidal salmonella have led to a wide range of panic. It is thereby critically urgent to develop high-efficiency, ultrasensitive techniques for typhoidal salmonella detection. Carboxylated graphene oxide (CGO), features as one of the most crucial substrates to immobilize probe DNA for the fabrication of DNA biosensor, has been studied extensively so far. However, the reagents involved in the protocols proposed previously due to their strong alkalinity and extremely high reducing properties would impose significant impact to their performance and application. Herein, we develop a novel strategy for effective carboxylation graphene oxide with sodium citrate and chloroacetic acid. X-ray photoelectron spectroscopy (XPS) results demonstrate the density of carboxyl is improved more than twice, in consistent with the results of nuclear magnetic resonance (NMR). Furthermore, decorated with cost-effective Fe 3 O 4 NPs, the conductivity of CGO could be enhanced remarkably, furthermore, far more 5’-end amino labeled probe DNA would be stably grafted. The performance of stepwise modification of the bioelectrodes is carried out by cyclic voltammetry (CV) and electrochemical impedance spectroscopes (EIS). Differential pulse voltammetry (DPV) studies exhibit a linear response ranging from 10 -17 to 10 -9 M for target DNA analysis with the detection limit up to 3.16×10 -18 M, using methylene blue (MB) as a redox indicator under optimal conditions. In addition, the as-prepared biosensor provides predominant capability for discriminating the similar target DNA sequences. Eventually, the proposed biosensor is surveyed by real samples and it shows outstanding performance. Consequently, the developed ssDNA/Fe 3 O 4 NPs/CGO/GCE can be a promising candidate for real patient samples analysis.
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Yan Guan,Peng-Bin Si,Tong Yang,Yuan Wu,Yun-Hui Yang,Rong Hu
Ochratoxin A (OTA) is a naturally occurring mycotoxin that poses serious threats, such as kidney damage, to human health. Therefore, we developed a DNA walker-based dual-signal electrochemical ratiometric platform for OTA detection, which could overlook the variations in environmental and instrumental factors and DNA load densities. Cobalt metal–organic frameworks (Co-MOFs) and toluidine blue were used as the electrochemical signal tag and internal reference probe, respectively. In the presence of OTA, this developed machine resulted in the DNA labelled-Co-MOFs far away from the electrode. Thus, Co-MOFs signal at −1.18 V decreased, while toluidine blue at −0.28 V increased. This proposed strategy has displayed superior sensitivity (limit of detection = 0.31 fg/mL, linear range = 1–50 ng/mL) and high reproducibility. The sensor was also applied for determining OTA content in red wine samples and the results were comparable to those of commercial enzyme-linked immunoassay kits with satisfactory results.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2022
·
IF 5.895
Yu-gang Shi,Shan Lin,Wen-xuan Chen,Lai Jiang,Qing Gu,Dong-hui Li,Yue-wen Chen
This study aimed to investigate the synergistic bactericidal activity and mechanism of dual-stage light-guided membrane and DNA-targeted photodynamic inactivation (PDI) by the combination of blue light (BL, 420 nm) and the food additive octyl gallate (OG) against Vibrio parahaemolyticus in planktonic and biofilm growth modes. While OG serves as an outstanding exogenous photosensitizer, the planktonic cells were not visibly detectable after the OG-mediated PDI treatment with 0.2 mM OG within 15 min (191.7 J/cm2), and its biofilm was nearly eradicated within 60 min (383.4 J/cm2). Gram-positive Staphylococcus aureus was more susceptible to the PDI than Gram-negative V. parahaemolyticus. The cellular wall and proteins, as well as DNA, were the vulnerable targets for PDI. The membrane integrity could be initially disrupted by OG bearing a hydrophilic head and a hydrophobic tail via transmembrane insertion. The enhancement of OG uptake due to the first-stage light-assisted photochemical internalization (PCI) promoted the accumulation of OG in cells. It further boosted the second-stage light irradiation of the photosensitizer-inducing massive cell death. Upon the second-stage BL irradiation, reactive oxygen species (ROS) generated through the OG-mediated PDI in situ could extensively deconstruct membranes, proteins, and DNA, as well as biofilms, while OG could be activated by BL to carry out photochemical reactions involving the formation of OG–bacterial membrane protein (BMP) covalent conjugates and the interactions with DNA. This dual-stage light-guided subcellular dual-targeted PDI strategy exhibits encouraging effects on the eradication of planktonic bacteria and sessile biofilms, which provides a new insight into the development of an ultraeffective antimicrobial and biofilm removing/reducing technique to improve microbiological safety in the food industry.
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JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Danfeng Wang,Min Liu,Yushu Wu,Tianxin Weng,Lu Wang,Yongfang Zhang,Yanna Zhao,Jun Han
The co-loading of chemotherapy-phototherapy (CTPT) combination drugs by aptamer-targeted DNA nanostructures has significant advantages in improving anticancer effects and overcoming the multidrug resistance of cancer cells. The different binding modes of drugs to DNA nanostructures may impact CTPT therapy. Here, the anti-drug resistance effects of idarubicin (IDA) or acridine orange (AO) as single drug, as well as IDA/mithramycin (MTR) dimers ((MTR) 2 Zn 2+ ) + AO combination drugs loaded by AS1411-tethered DNA nanotrains (AS1411NTrs), were studied. The intercalative binding mode between IDA/AO and AS1411NTrs was verified through measurements of viscosity, changes in melting temperature, and potassium iodide quenching. A series of thermodynamic parameters such as the binding constant and the number of binding sites were obtained through fluorescence spectroscopy, isothermal titration calorimetry, and differential scanning calorimetry. The high binding constants and the number of binding sites indicated that AS1411NTrs had a high loading capacity for IDA and AO. An in vitro release study showed that the release rate and release model of IDA/(MTR) 2 Zn 2+ /AO in the binary and ternary systems with or without deoxyribonuclease I were related to their binding mode and order of addition. An in vitro cytotoxicity study proved that the cytotoxicity and synergistic effects of the three drugs to human breast cancer MCF-7 cells and multidrug-resistant MCF-7/ADR cells were enhanced due to loading of AS1411NTrs. The IDA/(MTR) 2 Zn 2+ + AO combination drugs could more obviously enhance apoptosis of MCF-7/ADR cells as confirmed by cell apoptosis assays. The cell uptake study demonstrated that IDA/(MTR) 2 Zn 2+ /AO loaded by AS1411NTrs was mainly concentrated in the nucleus of MCF-7/ADR cells. This work will provide theoretical information for combination therapy of IDA/(MTR) 2 Zn 2+ and AO based on DNA nanostructures.
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ANALYST
·
2023
·Vol. 148
·期 18
·4346-4355
·
IF 4.2
Jiahai Wang,Cenlin Gui,Jianji Zhu,Baian Zhu,Zhuobin Zhu,Xiwen Jiang,Daqi Chen
Glass nanopore is an ideal candidate for biosensors due to its unique advantages such as label-free analysis, single-molecule sensitivity, and easy operation. Previous studies have shown that glass nanopores can distinguish different lengths of double-stranded DNA (dsDNA) at the same time with the length-resolution ability. Based on this, we proposed a novel design of a dsDNA block containing a programmable sensing site inside, which can be programmed to respond to different target molecules and cleaved into two smaller DNA blocks. When programming the sensing site with different sequences, for example, programming it as the substrate of GR-5 DNAzyme and CRISPR-Cas12a system, the DNA block could realize Pb2+ and cfDNA detection with the length-resolution ability of the glass nanopore. This strategy achieved a Pb2+ detection range from 0.5 nM to 100 nM, with a detection limit of 0.4 nM, and a BRCA-1 detection range from 1 pM to 10 pM, with a detection limit of 1 pM. The programable sensing site is easy to design and has strong expandability, which gives full play to the advantages of glass nanopore in length-resolution ability for dsDNA, and is expected to become an optional design for biosensing strategy for the glass nanopore as a biosensing platform.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Pengqi Gong,Xuegang Li,Qiming Zhao,Xue Zhou,Yanan Zhang,Yong Zhao
In order to realize the one-to-one correspondence between outputs and inputs in the multiparameter detection field, a multiparameter DNA hybridization sensor with temperature and pH detection channels based on a fiber-based triple surface plasmon resonance (Triple-SPR) effect is demonstrated in this paper. Compared with previous works, the significant innovation of this paper is the independent temperature testing and pH testing channels implemented based on a single fiber optic structure, and the high-sensitivity DNA hybridization detection channel. Polydimethylsiloxane and the self-assembled materials formed by polyacrylic acid (PAA) and chitosan (CS) are used for the real-time detection of temperature and pH. With the help of these two materials, the instantaneous response of the Triple-SPR sensor to temperature and pH has been realized, and the response times (RT) are less than 1 s and 20 s, respectively. After the modification of probe DNA (pDNA), the selective detection of complementary DNA (cDNA) is achieved. The sensitivity and detection limit (DL) reaches 0.09 nm/(nmol/L) and 3.69 nmol/L, respectively. The experimental results demonstrate that an approximately one-to-one correspondence exists between inputs and outputs. The output signals can be used to provide feedback signals for achieving stable temperature and pH environments. The advantages of multi-parameter independent detection, high-sensitivity as well as fast response of the fiber-based Triple-SPR sensing technology are of great significance in the field of future multi-parameter sensing, compensated detection as well as real-time bio-monitoring.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 4
·1-8
·
IF 5.833
Hai Hong,Chen Ciping,Chen Dongli,Li Peijun,Shan Yang,Li Jianping
An electrochemiluminescence (ECL) DNA biosensor based on ExoIII exonuclease assistance and hybridization chain reaction (HCR) amplification technology has been constructed. ExoIII exonuclease and triple-helix DNA molecular switch are used in detecting a target in circulation. By combining HCR with AuNPs@DNA, a novel signal probe is built, which enables multiple signal amplification and the high-sensitive detection of transgenic rice BT63 DNA. The Fe 3 O 4 @Au solution is added to a magneto-controlled glassy carbon electrode, and sulfhydryl-modified capture DNA (CP) is immobilized on Fe 3 O 4 @Au through the Au–S bond. Mercaptoethanol is added to close sites and prevent the nonspecific adsorption of CP on the magnetron glassy carbon electrode. A target DNA is added to a constructed triple-helix DNA molecular centrifuge tube for reaction. Owing to base complementation and the reversible switching of the triple-helix DNA molecular state, the target DNA turns on the triple-helix DNA molecular switch and hybridizes with a long-strand recognition probe (RP) to form a double-stranded DNA (dsDNA). Exonuclease ExoIII is added to specifically recognize and cut the dsDNA and to release the target DNA. The target DNA strand then circulates back completely to open the multiple triple-helix DNA molecular switch, releasing a large number of signal transduction probes (STP). To hybridize with CP, a large amount of STP is added to the electrode. Finally, a AuNPs@DNA signal probe is added to hybridize with STP. H1 and H2 probes are added for the hybridization chain reaction and the indefinite extension of the primer strand on the probe. Then, tris-(bipyridyl)ruthenium(II) is added for ECL signal detection with PBS-tri-n-propylamine as the base solution. In the concentration range 1.0 × 10 −16 to 1.0 × 10 −8 mol/L of the target DNA, good linear relationship was achieved with the corresponding ECL signal. The detection limit is 3.6 × 10 −17 mol/L. The spiked recovery of the rice samples range from 97.2 to 101.5%. The sensor is highly sensitive and has good selectivity, stability, and reproducibility. Graphical abstract
A novel electrochemiluminescence biosensor with extremely higher sensitivity was prepared for the determination of ultra-trace amount transgenic rice BT63 DNA. The sensitivity was significantly improved by multiple signal enhancements. Firstly, a large number of signal transduction probes are released when the triple-helix DNA molecular switch unlock after recycles assisted by ExoIII exonuclease under target BT63 DNA; and then the signal transduction probes hybridize with the signal probes of AuNPs@(DNA-HCR) produced through hybridization chain reaction. Finally, the signal probes which were embedded with a large amount of electrochemiluminescence reagent produce high luminescence intensity. The detection limit was 3.6 × 10 −17 mol/L, which is almost the most sensitive methods reported.
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高影响因子
危险品化学品经营许可证（带存储）