INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2026
·
IF 8.5
Jingwen Zhang,Biru Han,Xiru Zhang,Xinna Xie,Feng Zhao,Wei Zhang,Yujun Jiang,Xianlong Zhang
The efficient and sensitive detection of mycotoxins is critical to ensure food safety and maintain public health worldwide. In this study, a CRISPR/Cas12a-mediated marker-free fluorescent biosensor based on an automated 3D DNA walker-enabled ‘one-to-many’ signal amplification was developed for sensitive detection of aflatoxin B1. Due to the efficient amplification effect of DNA walkers and the strong fluorescence properties of silver nanoclusters, a sensitive output of the amplified signal was produced by precisely regulating the activated trans-cleavage activity of the specific target DNA of Cas12a. In the established fluorescence biosensor, a small amount of aflatoxin B1 promoted the production of a large amount of activator by the established 3D DNA walker, which stimulated the trans-cleavage activity of Cas12a to degrade the DNA single strands for synthesis of silver nanoclusters, leading to a decreased fluorescent signal. The established biosensor was able to achieve the sensitive detection of aflatoxin B1 under optimal conditions, obtaining a detection limit of 45.38 pg/mL in a linear range of 0.05 to 10 ng/mL. In addition, the developed biosensor showed good recoveries in spiked food samples (peanut milk and drinking water) at different concentrations. This work provided new insights for the applications of DNA walker and the development of a marker-free fluorescent biosensing platform based on CRISPR/Cas for the detection of mycotoxins.
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高影响因子
ANALYTICAL CHEMISTRY
·
2026
·Vol. 98
·期 31
·23179-23189
·
IF 7.3
Lv Xianfeng,Chen Minyan,Lin Bangfeng,Jiang Yaru,Zhou Jicheng,Zheng Xinyi,Wu Wenxin,Li Ning,Zhuang Junyang
Although photoelectrochemical (PEC) sensing offers low
background
and high sensitivity, most PEC platforms rely on semiconductor materials
and immobilized recognition probes, which complicate electrode fabrication
and reduce operational simplicity. Herein, we report a fossilization-inspired
photoelectrochemical sensing platform (FIPSP) for ultrasensitive detection
of aflatoxin B1 (AFB1) based on DNA-induced in situ CaCO 3 crystal growth on a gold electrode (AuE). We found that nucleic
acids could induce interfacial biomineralization of calcite-like CaCO 3 crystals on AuE, and the resulting mineralized layer effectively
modulated the intrinsic anodic PEC response of AuE. In this design,
a bead-immobilized initiator DNA was first hybridized with an AFB1
aptamer. Upon target recognition, the aptamer dissociated from the
bead-immobilized initiator DNA, allowing the initiator to trigger
a hybridization chain reaction (HCR) between two hairpin DNA probes.
After alkaline treatment, the HCR products were disassembled into
DNA strands, which were then released and adsorbed onto AuE to induce
in situ CaCO 3 crystal growth. The mineralized layer hindered
interfacial charge transfer and ascorbic acid diffusion, thereby suppressing
the photocurrent and enabling detection of AFB1. Under optimized conditions,
the developed FIPSP exhibited a linear range from 1 ag mL –1 to 10 pg mL –1 and a detection limit of 0.61 ag
mL –1 , together with excellent selectivity and reproducibility.
It also showed satisfactory performance in soybean oil and maize samples.
This work establishes a simplified PEC electrode construction strategy
that requires neither semiconductor photoactive material synthesis
nor probe immobilization on the electrode surface, providing a promising
platform for ultrasensitive AFB1 analysis.
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ACS Applied Nano Materials
·
2026
·
IF 5.8
Fatemeh Sasanipoor,Zhiqing Zhang,Ruyan Zhang,Gan Ning,Ting Zhou,Xiufeng Wang,Fang Wang
Achieving precise integration of molecular targeting, controlled drug release, and efficient photothermal conversion remains a critical challenge in the development of synergistic cancer nanotherapies. Here, we presented a programmable dual-aptamer DNA–MoS2 quantum dot (QDs) nanoplatform, constructed via multivariate hydrothermal synthesis and rolling circle amplification (RCA). Systematic optimization identified glutathione as the optimal sulfur source, resulting in the preparation of ultrasmall MoS2-QDs with strong 808 nm absorption, high colloidal stability, and excitation-dependent fluorescence. Covalent conjugation of these QDs to an RCA-derived DNA scaffold enabled high-density assembly of MUC1 and AS1411 aptamers and facilitated efficient doxorubicin (DOX) intercalation within GC-rich duplex regions. The resulting nanoplatforms demonstrated selective uptake by MCF-7 breast cancer cells, negligible internalization in normal fibroblasts, and DNase-responsive drug release. Upon near-infrared irradiation, the dual-aptamer assemblies elicited rapid photothermal heating, elevated intracellular reactive oxygen species (ROS), and mitochondrial dysfunction, generating a potent synergistic chemo-photothermal cytotoxicity. DOX-loaded RA@QDs further inhibited cancer cell migration, highlighting the enhanced therapeutic efficacy. This modular nanoplatform integrates the programmable DNA architecture, precise molecular targeting, enzyme-responsive drug delivery, and efficient photothermal activation, providing a scalable and mechanistically unified strategy for precision cancer nanomedicine.
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JOURNAL OF HAZARDOUS MATERIALS
·
2026
·
IF 10.6
Junhua Chen,Yile Deng,Jiafeng Pan
A lateral flow strip biosensor with LOD of 10 pM was developed for visual detection of Cr 3+ . • Trigger DNA regeneration strategy results in enhanced signal amplification. • Cr 3+ and Cd 2+ were used to build INHIBIT and XOR logic gates. • The logic strip holds great promise for intelligent sensing of different heavy metal ions. The on-site and visual detection of trace levels of heavy metal ions in resource-limited settings is still a big challenge. Herein, using chromium ions (Cr 3 + ) as a model target, we developed a lateral flow strip biosensor for visual detection of Cr 3+ on the basis of a feedback circuit with trigger DNA regeneration strategy. Cr 3+ -specific DNAzyme was used to recognize Cr 3+ . The free trigger DNA (T) after the cleavage reaction can initiate the assembly of hairpin probes H1, H2, and H3. The resulting H1-H2-H3 products contain a freshly regenerated T fragment, which can continuously drive the operation of feedback DNA circuit, thereby yielding abundant H1-H2-H3 assemblies. Compared with the no T regeneration strategy, the feedback circuit with T regeneration method exhibits superior signal amplification capability. The strip biosensor achieves a visual detection limit of 10 pM. Moreover, the sensing platform exhibits favorable robustness and performs reliably when applied to practical water samples. Using Cr 3+ and cadmium ion (Cd 2+ ) as two inputs, we further constructed INHIBIT and XOR strip logic gates that open new avenues for intelligent detection of different heavy metal ions in resource-poor environments. Download: Download high-res image (215KB) Download: Download full-size image
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Junyi Wu,Yao Liu,Dongwei Zhu,Jianxing Xu,Jian Yun
A DSN-triggered Y-shaped dual-circular-probe DNA walker is developed for RCI-associated miR-29a detection. • The Y-shaped steric hindrance structure effectively suppresses non-specific DSN cleavage, ensuring ultralow background. • The cascade amplification strategy achieves a detection limit as low as 0.26 fM for miR-29a. • The ICP-MS-based Rh readout provides label-free, photobleaching-free, and robust quantification. • The method exhibits excellent single-base mismatch discrimination and reliable performance in serum and cell samples. Rotator cuff injury (RCI) is a prevalent musculoskeletal disorder with limited early diagnostic options, partly due to the lack of sensitive and non-invasive biomarkers. Magnetic resonance imaging (MRI), the current mainstream imaging tool for RCI, suffers from high cost, limited accessibility, and an inability to reflect molecular-level pathological changes before structural damage becomes evident. MicroRNAs (miRNAs) have shown promise as diagnostic indicators, yet their reliable detection in clinical contexts requires methods with ultrahigh sensitivity and single-base resolution. Here, we report a duplex-specific nuclease (DSN)-triggered DNA walker with dual circular probes for highly specific and ultrasensitive analysis of RCI-associated miR-29a by inductively coupled plasma mass spectrometry (ICP-MS). The DNA walker is assembled on magnetic beads, where the walking track comprises two circular probes (c1 and c2) forming a Y-shaped steric hindrance structure that effectively suppresses non-specific DSN cleavage, ensuring an ultralow background. Upon target miR-29a hybridization, DSN specifically cleaves the DNA–RNA hybrid, initiating a cascade amplification involving self-priming, nicking/polymerase cycling, rolling circle amplification, and DNAzyme-mediated cleavage of a rhodium-labeled substrate. The released rhodium is quantified by ICP-MS, providing a photobleaching-free readout. The proposed method achieves a detection limit as low as 0.26 fM with outstanding single-base mismatch discrimination, a wide dynamic range from 1 fM to 100 pM, excellent recoveries in serum (93.2–103.2%), and high correlation with RT-PCR (R 2 = 0.9912) in real cell line samples. This DSN-triggered DNA walker offers a robust, sensitive, and specific platform for RCI-related miRNA detection, holding great promise for early diagnosis and prognosis monitoring of rotator cuff injuries. Download: Download high-res image (78KB) Download: Download full-size image
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NEUROCHEMICAL RESEARCH
·
2026
·Vol. 51
·期 1
·73
·
IF 4.5
Zhou Juan,Li Haipeng,Wen Ying,He Lingli,He Yangli,Meng Heng
Neuromyelitis optica spectrum disorder (NMOSD) is a rare but serious inflammatory demyelinating disease. A key characteristic of NMOSD is the presence of a pathogenic autoantibody in serum called aquaporin-4 immunoglobulin G (AQP4-IgG). This study investigates the mechanism of astrocyte-derived small extracellular vesicles (EVs) carrying mitochondrial DNA (mtDNA) to promote AQP4-IgG-induced microglial activation in neuromyelitis optica (NMO) via the toll-like receptor 9 (TLR9)/myeloid differentiation primary response 88 (MyD88)/nuclear factor-kappa B (NF-κB) pathway. Serum IgG was isolated from NMOSD patients (AQP4-IgG) and healthy controls (Con-IgG). Astrocytes were treated with AQP4-IgG or Con-IgG. EVs were isolated via ultracentrifugation, characterized, and examined for internalization. Microglia were exposed to EVs, and mtDNA levels were assessed. An NMO mouse model was established, with neurological damage, mouse behaviors, tissue damage, and microglial characterization evaluated using modified neurological severity score, open-field test, rotarod test, luxol fast blue staining, and flow cytometry. Inflammatory cytokines, TLR9, MyD88, p65, IκBα, p-p65, and p-IκBα in BV2 cells and spinal cord tissues were analyzed via ELISA, RT-qPCR, and western blot. AQP4-IgG-induced astrocyte-derived EVs increased Iba1-high-expressing and CD86/tumor necrosis factor-α-high-expressing cells, reduced CD206/transforming growth factor-β-high-expressing cells, and boosted inflammatory responses. AQP4-IgG-induced EVs carried mtDNA to activate microglia via the TLR9/MyD88/NF-κB pathway. TLR9/MyD88/NF-κB pathway inhibition reversed AQP4-IgG-induced EVs’ promotion on microglial activation. In vivo, AQP4-IgG-induced EVs-mtDNA exacerbated microglial activation and NMO through the TLR9/MyD88/NF-κB pathway. AQP4-IgG-induced EVs carried mtDNA to upregulate TLR9, further activating the MyD88/NF-κB pathway, thereby promoting microglial activation and transition toward pro-inflammatory gene-high-expressing cells to drive NMO progression.
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BIOSENSORS & BIOELECTRONICS
·
2026
·
IF 11.8
Binbin Lu,Yu Li,Wangkang Shen,Xia Zhou,Jinlin Xiong,Wenwen Li,Yixiang Duan,Shijian Feng,Liuying Li,Zewei Luo
Gold nanoparticles (AuNPs) are widely used in fiber-optic (FO) local surface plasmon resonance (LSPR) biosensors due to their ease of modification, high dielectric constant, and biocompatibility. However, salt ions and cross-linking agents often cause AuNPs aggregation during modification, which significantly degrades the sensing sensitivity of FO-based LSPR. Herein, tetrahedron DNA-encapsulated AuNPs (TDN-AuNPs) were served as a new nanolayer on FO surface for a sensitive biosensor. TDN improved the salt-resistance and cross-linking agent-resistance, also served as a gap to hinder the nanolayer close to each other, which could avoid the AuNPs aggregation on the FO surface. Further, a significant merit of molar ratio-dependent refractive index sensitivity was found in the FO-based LSPR through the three kinds of modification methods, namely self-assembled monolayer (SAM)-based, ployA-based, and complementary strand (CS)-based methods. Further, CS-based method maintained strong chemical stability under weak acid or neutral environment and exhibited stronger binding stability and long-term stability compared to the other two methods. Finally, the CS-based method also showed a new merit of molar ratio-dependent sensing sensitivity. The mole ratio of TDN: AuNPs played a vital role in sensing sensitivity. Under the optimal conditions, the lowest limit of detection of 12 cells/mL was obtained within 50 min. Since high stability, sensitivity, and selectivity for cancer cell sensing, FO-based LSPR biosensor via CS-based method had great potential for cancer diagnosis in the early stage.
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JOURNAL OF COORDINATION CHEMISTRY
·
2023
·
IF 1.9
Xiao-Tong Song,Ying Zhou,Gui-Bao Liu,Hui-Chao Guan,Shu-Mei Yue
By single-crystal X-ray diffraction (XRD) analysis, five complexes, catena-[(µ-2,2-bis(4-carboxyphenyl)hexafluoropropane)-(2-(pyidin-2-yl)-1,3-benzothiazole)-aqua-zinc(II)] (1), catena-[(µ-2,2-bis(4-carboxyphenyl)hexafluoropropane)-(2-(pyidin-2-yl)1,3-benzothiazole)-aqua-cadmium(II)] (2), catena-[hepta(µ-2,2-bis(4carboxyphenyl)hexafluoropropane)-diaqua-bis(2-(pyidin-2-yl)-1,3-benzothiazole)-tri-manganes(II)] (3), catena-[(µ-benzene-1,2,4,5-tetracarboxylato)-(2-(pyidin-2-yl)-1,3benzothiazole)copper(II)] (4) and catena-[(µ-3-nitrobenzene-1,2-dicarboxylato)-(2-(pyidin-2-yl)1,3-benzothiazole)-aqua-zinc(II)] (5), were characterized in this research. In these five complexes, H2hfipbb = 2,2-bis(4-carboxyphenyl)hexafluoropropane, H4btec = 1,2,4,5-benzenetetracarboxylic acid, H2NPTA = 3-nitrophthalic acid and bpt = 2-(pyridin-2-yl)benzo[d]thiazole). Complexes 1 and 2 occur in the monoclinic system with space group C2/c, 4 and 5 occur in the monoclinic system with space group P21/c, and 3 occurs in the triclinic system with space group P-1. The interaction between CT-DNA (calf thymus DNA) and those complexes was examined using UV spectroscopic analysis, fluorescent spectroscopic analysis, circular dichroism spectroscopy (CD) and viscosity analysis. This research reveals that those complexes have strong ability to interact with DNA, and they all bind to DNA in an intercalation mode, thus affecting the structure of DNA. This binding mode can arise from the interaction between the benzothiazole metal complexes and DNA. Hence, we hope to provide some scientific research bases for studying benzothiazole complexes and designing new thiazole anticancer drugs.
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ENVIRONMENTAL POLLUTION
·
2022
·
IF 9.988
Wenjing Pu,Xuesheng Chu,Huiling Guo,Gang Huang,Ting Cui,Bingyan Huang,Xueyan Dai,Caiying Zhang
Cadmium (Cd) and excess molybdenum (Mo) have multiple organ toxicity, and testis is one of their important target organs, but the reproductive toxicity of Mo and Cd combined treatment is still unclear. To explore the effects of Mo and Cd co-exposure on DNA damage and autophagy from the insight of ATM/AMPK/mTOR axis in duck testes, we randomly assigned 40 healthy 8-day-old ducks to control, Mo (100 mg/kg Mo), Cd (4 mg/kg Cd), and Mo + Cd groups for 16 weeks. Results found that Mo and/or Cd exposure caused trace elements imbalance, oxidative stress with a decrease in the activities of GSH-Px, CAT , T-SOD and GSH content, an increase in the concentrations of H 2 O 2 and MDA and pathological damage. Additionally, Mo and/or Cd markedly raised DNA damage-related factors expression levels and 8-OHdG content, caused G1/S arrest followed by decreasing CDK2 and Cyclin E protein levels and increasing CDK1 and Cyclin B protein levels, and activated ATM/AMPK/mTOR axis by enhancing p-ATM/ATM, p-AMPK/AMPK and reducing p-mTOR/mTOR protein levels, eventually triggered autophagy by elevating LC3A, LC3B, Atg5, Beclin-1 mRNA levels and LC3II/LC3I, Beclin-1 protein levels and reducing P62, Dynein, mTOR mRNA levels and P62 protein level. Moreover, these changes were most apparent in the combined group. Altogether, the results reveal that autophagy caused by Mo and/or Cd may be associated with activating the DNA damage-mediated ATM/AMPK/mTOR axis in duck testes, and Mo and Cd co-exposure exacerbates these changes.
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Materials Today Chemistry
·
2022
·
IF 7.613
Yulin Zheng,Yunlei Zhou,Xiaoting Cui,Huanshun Yin,Shiyun Ai
The photoactivity of CdS nanorods was greatly improved by amino functionalized accordion-like MXene and spherical ZnSnO 3 . MXene possesses good electron transfer capability and ZnSnO 3 presents matched energy band with CdS, which deeply accelerate the electron transfer and prevent the recombination of photogenerated electron-hole pair, leading to a strong photoelectrochemical (PEC) response. Taking the merit of the improved photoactivity of CdS nanorods, a novel PEC biosensor was constructed for DNA hydromethylation detection based on immune recognition of target molecule, where 5-hydroxymethyl-2′-deoxycytidine triphosphate (5hmdCTP) was employed as detect target, CdS/MXene was used as photoactive material, and ZnSnO 3 was adopted as signal amplification unit. Under enzymatic covalent reaction of –CH 2 OH of 5hmdCTP with –NH 2 of MXene, 5hmdCTP was specifically recognized and captured. Then, taking advantages of the covalent reaction between phosphate group of 5hmdCTP and ZnSnO 3 , the signal amplification unit was captured. Under the optimum conditions, this PEC biosensor presents wide linear range of 0.008–100 nM and low detection limit of 4.21 pM (3σ). The applicability of the developed method was evaluated by investigating the effect of Cd 2+ and perfluorohexane compound pollutant on 5-hydroxymethylcytosine content in the genomic DNA of the roots and leaves of wheat seedlings.
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TALANTA
·
2021
·
IF 6.057
Kai Zhang,Zhenqiang Fan,Yue Huang,Yuedi Ding,Minhao Xie
Early diagnosis and timely management of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) are the keys to preventing the spread of the epidemic and controlling new infection clues. Therefore, strengthening the surveillance of the epidemic and timely screening and confirming SARS-CoV-2 infection is the primary task. In this work, we first proposed the idea of activating CRISPR-Cas12a activity using double-stranded DNA amplified by a three-dimensional (3D) DNA walker. We applied it to the design of an electrochemiluminescent (ECL) biosensor to detect the SARS-CoV-2 RNA-dependent RNA polymerase (RdRp) gene. We first activated the cleavage activity of CRISPR-Cas12a by amplifying the target DNA into a segment of double-stranded DNA through the amplification effect of a 3D DNA walker. At the same time, we designed an MXene based ECL material: [email protected] 3 C 2 @AuNPs, and constructed an ECL biosensor to detect the RdRp gene based on this ECL material as a framework. Activated CRISPR-Cas12a cleaves the single-stranded DNA on the surface of this sensor and causes the ferrocene modified at one end of the DNA to move away from the electrode surface, increasing the ECL signal. The extent of the change in electrochemiluminescence reflects the concentration of the gene to be measured. Using this system, we detected the SARS-CoV-2 RdRp gene with a detection limit of 12.8 aM. This strategy contributes to the rapid and convenient detection of SARS-CoV-2-associated nucleic acids and promotes the clinical application of ECL biosensors based on CRISPR-Cas12a and novel composite materials.
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ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Lushan Liang,Meng Chen,Yanli Tong,Weiguo Tan,Zuanguang Chen
Herein, a universal fluorescent biosensor was developed for detecting Mycobacterium Tuberculosis (MTB) specific insertion sequence IS6110 gene fragment based on Förster resonance energy transfer (FRET) strategy. CdTe quantum dots (QDs), with excellent luminous performance, were used to label single-stranded DNA (ssDNA) as fluorescence donor (QDs-DNA), in which the ssDNA was complementary to the IS6110 gene fragment. A new type of two-dimensional metal-organic framework (Cu-TCPP) was served as an acceptor. The Cu-TCPP exhibited a higher affinity towards ssDNA than double-stranded DNA (dsDNA). In the absence of targets, the fluorescence of QDs-DNA was quenched – due to the π-π stacking interactions between Cu-TCPP and ssDNA. Otherwise, QDs-DNA hybridized with the target to form a double helix and the fluorescence maintained in a target-concentration dependent manner. Excess QDs-DNA would be quenched and produced negligible background signal. The fluorescent sensor possessed a linear range from 0.05 nM to 1.0 nM with a low detection limit of 35 pM. Furthermore, we successfully applied this biosensing system to detect clinical sputum samples. This method displayed high sensitivity, specificity and great potentials in the early diagnosis of Tuberculosis.
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危险品化学品经营许可证（带存储）