Chemosensors
·
2022
·Vol. 10
·期 7
·250
·
IF 4.229
Zhonghui Chen,Guoli Chen,Wei Lin,Jinqiu Li,Lishan Fang,Xinyang Wang,Ying Zhang,Yu Chen,Zhenyu Lin
Hydrogen sulfide (H2S) in joint fluid acts as a signal molecule to regulate joint inflammation. Direct detection of H2S in joint fluid is of great significance for the diagnosis and treatment of arthritis. However, due to the low volume of joint fluid and low H2S concentration, existing methods face the problem of the insufficient limit of detection. In this study, a highly sensitive biosensor was proposed by designing a primer probe and combining it with hybrid chain reaction (HCR) under the strong interaction between metal ions and H2S to achieve H2S detection. The primer probe containing multiple cytosine (C) sequences was fixed on a gold electrode, and the C–Ag–C hairpin structure was formed under the action of Ag+. In the presence of H2S, it can combine with Ag+in the hairpin structure to form Ag2S, which leads to the opening of the hairpin structure and triggers the hybridization chain reaction (HCR) with another two hairpin structures (H1 and H2). A large number of double-stranded nucleic acid structures can be obtained on the electrode surface. Finally, Ru(phen)32+can be embedded into the double chain structure to generate the electrochemiluminescence (ECL) signal. The linear response of the H2S biosensor ranged from 0.1000 to 1500 nM, and the limit of detection concentration of H2S was 0.0398 nM. The developed biosensor was successfully used to determine H2S in joint fluid.Keywords:hydrogen sulfide;electrochemiluminescence;hybridization chain reaction;joint fluid
研究领域:
分析化学
·
生物传感器
·
炎症研究
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xue Zhang,Yamin Yu,Kaixin Du,Wenwei Han,Jie Xue,Shanshan Li,Shangyou Lv,Jianye Fu,Xin Wang,Meng Qiu
The global pandemic of coronavirus disease 2019 (COVID-19) highlights the shortcomings of the current testing paradigm for viral disease diagnostics. Though the Polymerase Chain Reaction (PCR) technique is currently used for nucleic acid detection in liquid samples, its application in airborne virus has not yet been developed, due to low viral load in the air, lack of efficient capture probe and supporting equipment. Herein, we developed an ultrasensitive biosensing nanoplatform for airborne virus detection. The extraction and concentration of nucleic acid from test samples has been accomplished by novel spike silica nanoparticles (SSNPs)-based nucleic acid capture probe with high spike length to nanoparticle diameter ratio and appropriate surface potential. When integrated with air sampler and Quantitative Real-Time PCR (qPCR) equipment, nucleic acid enrichment can be achieved significantly. Our results demonstrated a successful detection of the virus in the air with the limit of detection (LoD) of 500 copies/L, which greatly surpasses the LoD of 1 × 10 6 copies/L. This detection method effectively addresses the obstacle posed by the low abundance of pathogens in the environment and could be applied for the detection of pathogens in air or water, aiming to achieve the goal of disease prevention and control prior to its onset.
研究领域:
纳米技术
·
病毒学
·
生物医学工程
·
分析化学
·
公共卫生
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Li Zou,Xinghui Li,Tingting Li,Liansheng Ling
We have constructed a novel colorimetric sensing platform for quantitative detection of acetylcholinesterase (AChE) activity and its inhibitor (donepezil) in rat blood, which integrates the signal amplification of DNAzyme and hybridization chain reaction (HCR) with the assembly of gold nanoparticles (AuNPs). Herein, in the presence of AChE and its substrate acetylthiocholine (ATCh), the sensing system exhibits a dramatic decrease in absorbance at 522 nm, where AChE hydrolyzes ATCh into thiocholine, the resulting thiols capture Cu 2+ from DNAzyme, and then the substrate strand of DNAzyme acts as an initiator to trigger HCR process. The HCR products can induce the assembly of AuNPs via DNA hybridization, accompanying by a sharp color-change from red to blue. When donepezil is added, the enzymatic activity of AChE is suppressed, resulting in an increase in the absorbance at 522 nm. Under optimal conditions, the colorimetric sensing platform shows sensitive responses to AChE and donepezil in the range of 0.02–1.5 mU mL −1 and 0.5–100 nM, respectively. The detection limits of AChE and donepezil are as low as 5 μU mL −1 and 0.5 nM, respectively. Owing to high sensitivity of the proposed method, various nonspecific interactions can be eliminated with a sufficient dilution, indicating that our strategy has great potential for practical application in neurobiology and pharmacology fields.
研究领域:
生物化学
·
分子诊断
·
药物筛选
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Ruidi Shen,Li Zou,Shixin Wu,Tingting Li,Jing Wang,Jianmin Liu,Liansheng Ling
A novel label-free fluorescent sensor for histidine was developed based upon Cu 2+ -specific DNAzyme, hybridization chain reaction(HCR) and triplex DNA . Cu 2+ can bind to the histidine, in the presence of histidine, leading to the inhibition of the cleavage of substrate strand of Cu 2+ -dependent DNAzyme, then the intact substrate strand trigger the HCR between H1 and H2. The HCR product can be recognized by triplex-forming oligonucleotide (TFO) through triplex formation and reported by the fluorescence of berberine , the fluorescence intensity of the sensing system was proportional to the concentration of histidine during the range of 5.7–455 nmol L −1 , with a detection limit of 2.0 nmol L −1 .
研究领域:
生物化学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL LETTERS
·
2023
·
IF 2
Yi Wu,Guobao Zhou,Zeyu Ma,Dan Zhang,Jianrong Chen,Lei Li
Deep understanding of the effect of DNA sequence and structure on the fluorescent properties of DNA-templated silver nanoclusters (DNA–Ag NCs) affords alternative strategies for developing and exploiting DNA biosensors. DNA secondary structures (e.g., DNA loop) are essential for generating highly emissive DNA–Ag NCs. In this study, a cytosine-rich DNA loop was used as a facile template for the formation of silver nanoclusters. The fluorescence of silver nanocluster encapsulated within a cytosine-rich DNA loop was turned on by switching the size of the loop from large to small. Target nucleic acid served as the trigger for the hybridization chain reaction of hairpin probe 1 (H1) containing an inactivated cytosine-rich DNA loop with a large size at the ends and hairpin probe 2 (H2). Long-nicked double helices were obtained coupled with the opening of the large-size cytosine-rich DNA loop in H1 and switching to an activated cytosine-rich DNA loop with a small size. As a result, an increase in the fluorescent signal was observed. A sensitive detection limit of 10 pM and a linear detection range from 10 pM to 400 nM were obtained for nucleic acid determination. This facile assay provides a new approach capable of switching the fluorescence emission of DNA–Ag NCs for nucleic acid biosensing.
研究领域:
生物化学
·
分子生物学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Yudie Sun,Kehong Quan,Ruilai Zhang,Aobo Feng,Mingfu Ye,Kui Zhang
Methicillin-resistant Staphylococcus aureus (MRSA) is a ubiquitous foodborne pathogen capable of causing food poisoning and producing enterotoxins in foodstuffs, which ultimately results in various illnesses, such as vomiting, diarrhea, and pneumonia. In this study, we present a MoS 2 NF@AuNPs enhanced electrochemiluminescence (ECL) biosensor for MRSA detection based on a DNA branching tree structure formed via enzyme-free hybridization chain reaction (HCR) amplification. This approach integrates bacterial aptamers with multistage HCR amplification to achieve highly sensitive and specific target recognition. Furthermore, MoS 2 NF@AuNPs act as a synergistic catalyst for Ru(bpy) 3 2+ molecules, which in turn substantially enhances the signal readout of the biosensor. The biosensor exhibits a robust linear correlation for MRSA detection over a concentration range of 10 0 to 10 7 cfu/mL, with a detection limit of 1 cfu/mL. In addition, the biosensor demonstrates excellent selectivity and high sensitivity when applied to real samples such as water, juice, and milk.
研究领域:
微生物学
·
生物传感技术
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Haoran Zheng,Jiayu Guo,Han Wang,Yurou Wang,Wenxiang Zhou,Ke Liu,Qiang Ma,Yanfei Qi
Bacteria are prevalent environmental pollutants. Live bacteria can proliferate and spread under appropriate conditions, presenting higher risks compared to non-viable counterparts. However, detecting live bacteria remains a challenge. Adenosine triphosphate (ATP), an energy currency in organisms, offers a reliable biomarker for the live bacteria sensing. Herein, we developed a zeolitic imidazolate framework-90 (ZIF-90) enhanced ATP sensing platform to detect live bacteria. The nanosystem which based on ZIF-90, encapsulating the DNA decorated magnetic beads (MB@S1) through self-assembly. When the S. aureus aptamers on ZIF-90 bonded to bacteria, the skeleton structure of ZIF-90 was disrupted by ATP leakage from live bacteria, leading to the release of MB@S1. Then, the MB@S1 initiated the hybridization chain reaction (HCR) and they were transduced by CRISPR-Cas12a to amplify the signal twice. The proposed ZIF-90 blocking sensing strategy (ZIF-90 strategy) exhibited remarkable sensitivity with the limit of detection (LOD) down to 0.223 pM for ATP detection, about 500 folds lower than the traditional ATP aptamer blocking sensing strategy (aptamer strategy). Furthermore, we used a smartphone for on-site analysis, realizing the quantification of live S. aureus with the LOD of 2.0 CFU/mL. Therefore, the approach possessed great application potential for public health, environment monitoring, bioanalysis and food safety.
研究领域:
生物化学
·
分子生物学
·
纳米医学
·
环境科学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Liyan Zhang,Xiaoting Liu,Nan Zhang,Xianqiang Liu,Wei Jiang
Sensitive and accurate detection of flap endonuclease 1 (FEN1) is essential to understand its roles in DNA replication and repair and explore its functions in tumor diagnosis and prognosis. Here, we designed a magnetic separation-assisted cascade hybridization chain reaction (HCR) amplification strategy for enzyme-free and sensitive detection of FEN1. Firstly, the forked dsDNAs contained the recognition site (5′ overhanging DNA flap) of FEN1 were modified on magbeads surface to form magnetic recognition probes. By the recognition and catalytic cleavage of FEN1, the 5′ flaps were removed into solution and then purified by magnetic separation. Then, the obtained flaps served as triggers to activate the linear-assembly of hairpin probes H1 and H2 (primary HCR), forming nicked double helices with split fragments. Finally, the fragments acted as new triggers to activate the branched-assembly of hairpin probes H3 and H4 (secondary HCR), causing fluorophore/quencher labeled on H3 far away and fluorescence recovery. Benefiting from the purification of triggers by magnetic separation and the signal amplification effect of cascade HCR, this strategy achieved a low detection limit of 3.6 × 10 −5 U μL −1 for FEN1, and enabled the assay of it in actual samples. The results demonstrate that our strategy will provide a potent approach for sensitive detection of FEN1 in early tumor diagnosis and prognosis.
研究领域:
分子生物学
·
肿瘤诊断
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2023
·Vol. 148
·期 24
·6297-6305
·
IF 4.2
You Wu,Zheng Wang,Jing Li,Jingjing Yang,Yinzhuo Shen,Hongbo Li,Xiao-Ya Hu,Qin Xu
Herein, a dual-mode detection system was constructed for efficient and accurate detection of bisphenol A (BPA) with the assistance of the BPA-induced hybridization chain reaction (HCR). The captured DNA (cDNA) was first modified on the surface of magnetic spheres modified with gold nanoparticles and polydopamine and then hybridized with the BPA aptamer to form double-stranded DNA (dsDNA). In the presence of the BPA target, the BPA aptamer was released from the surface of the magnetic sphere. The free cDNA triggered a HCR to construct a DNA duplex. Methylene blue (MB), as a bifunctional probe, was intercalated into the double-stranded DNA to amplify the photocurrent (IPEC) of the CdS-modified electrode and generate an electrochemical current (IEC) at the same time. Under the optimized conditions, the PEC and EC signal responses of the system were linear to the logarithm of BPA concentration in the range of 1.0 × 10−10 M to 1.0 × 10−5 M. The detection limits were found to be 1.27 × 10−11 M and 3.0 × 10−11 M using the PEC and EC methods, respectively. The constructed dual-mode biosensor exhibited good performance for real sample analysis, demonstrating its promising potential for practical applications. In addition, this dual-mode detection strategy provides more accurate and reliable detection results.
研究领域:
生物传感技术
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 3
·1-9
·
IF 5.705
Zhang Kai,Gan Ning,Hu Futao,Chen Xixue,Li Tianhua,Cao Jinxuan
The authors describe an enzyme-free aptamer-based assay for the determination of the model antibiotic kanamycin (Kana). The method is making use of (a) microfluidic chip electrophoresis; (b) a stirring bar carrying a gold-labeled aptamer probe, and (c) the hybridization chain reaction (HCR) for signal amplification. Firstly, a stirring bar (length: 1 cm; diameter: 0.2 mm) was modified with a large amount of duplex DNA and then hybridized with aptamer and its partially complementary chains (cDNA). In the presence of Kana, the binding between the Kana and aptamer unwinds the duplex structures and releases a corresponding amount of cDNA into the supernatant. The released cDNA triggers the HCR in the presence of H1 and H2 DNA hairpin to produce a large amount of duplex DNA chains with different lengths. At the same time, the amounts of H1 and H2 are reduced. The decreased signal of H1/H2 after several HCR cycles can be used to quantify kana in the 1 pg·mL −1 to 10 ng·mL −1 , with a detection limit of 0.29 pg·mL −1 . The signal is generated by reading the fluorescence, best at excitation/emission maxima of 470/525 nm. The whole detection process takes 3 min only. The assay was employed to the detection of Kana in spiked milk and fish samples. Results are consistent with those of an enzyme linked immunosorbent assay. The assay has high throughput, high selectivity, and high amplification capability.
Schematic of a stirring bar functionalized with gold-labeled aptamer acting as the capture probe. It can capture the target and release primer simultaneously. The primer triggers the hybridization chain reaction inducing the consumption of H1 and H2. After a certain reaction time, the mixture is injected into the MCE platform for microfluidic electrophoretic separation and fluorometric detection.
研究领域:
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
·
2023
·
IF 12.8
Yang Guo,Gang Yu,Urs von Gunten,Yujue Wang
Superoxide radicals (O 2 •− ) have been suggested as an important chain carrier in the radical chain reaction that promotes ozone (O 3 ) decomposition to hydroxyl radicals ( • OH) during ozonation. However, due to the difficulty in measuring transient O 2 •− concentrations, this hypothesis has not been verified under realistic ozonation conditions during water treatment. In this study, a probe compound was used in combination with kinetic modeling to evaluate the role of O 2 •− for O 3 decomposition during ozonation of synthetic solutions with model promotors and inhibitors (methanol and acetate or tert -butanol) and natural waters (one groundwater and two surface waters). By measurement of the abatement of spiked tetrachloromethane (as a O 2 •− probe), the O 2 •− exposure during ozonation was determined. Based on the measured O 2 •− exposures, the relative contribution of O 2 •− to O 3 decomposition, in comparison to OH − , • OH, and dissolved organic matter (DOM), was quantitatively evaluated using kinetic modeling. The results show that water compositions (e.g., the concentration of promotors and inhibitors, and the O 3 reactivity of DOM) have a considerable effect on the extent of the O 2 •− -promoted radical chain reaction during ozonation. In general, the reaction with O 2 •− accounted for ∼59‒70% and ∼45‒52% of the overall O 3 decomposition during ozonation of the selected synthetic solutions and natural waters, respectively. This confirms that O 2 •− plays a critical role in promoting O 3 decomposition to • OH. Overall, this study provides new insights on the controlling factors for ozone stability during ozonation processes.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Applied Food Research
·
2024
·
IF 4.5
Nali Zhou,Hanyue Zhang,Shuna Xiang,Yingting Lin,Ying Shang
Multiplex ligation-dependent probe amplification (MLPA) is a high-throughput detection technology with superior specificity and sensitivity, which combines ligation-dependent probe hybridization and PCR amplification. However, the whole process requires repeated temperature change, and the detection results need high resolution agarose electrophoresis or capillary electrophoresis, which limits its application. In viewing of its advantages, an isothermal reaction process based on that combined Hybridization chain reaction (HCR) and hydrogel technology is developed, in order to achieve visual output of detection results without relying on any large instruments and equipment. The edible mushroom is taken as the detection target, and the LP probes were designed according to its reported endogenous reference gene. Through optimizing the reaction conditions, only the samples contained target component, the result showed irregular hydrogel. This visual detection system had good specificity, which detection limit was as low as 0.32 ng/μL. The development of this method provides a new strategy for species identification and adulteration detection of edible mushroom, even for more DNA target detection.
研究领域:
分子生物学
·
生物技术
·
食品科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）