JOURNAL OF LUMINESCENCE
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2026
·
IF 3.8
Liqian Niu,Xian Wang,Xinxin Liu,Xin Liu,Shiyue Niu,Bin Yang,Jia Liu,Shuyun Bi
A highly sensitive surface-enhanced Raman spectroscopy (SERS) method for the detection of acephate was established by using the substrate of silver nanoparticles (AgNPs) modified with N-acetyl-L-cysteine (NAC) and zinc oxide (ZnO). The Raman signal enhancement factor (EF) of acephate by the substrate of ZnO/NAC/AgNPs can be reached 4.95 × 10 6 . The ultraviolet-visible spectroscopy (UV-vis), high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), zeta potential, Fourier transform infrared spectra (FT-IR) and thermogravimetric analysis (TGA) were used to characterize the substrate of ZnO/NAC/AgNPs. The mechanism of electromagnetic enhancement (EM) assisted by chemical enhancement (CM) was elucidated in detail. The optimal experimental conditions were selected. The interference experiments showed that this method had high selectivity in complex substrates. There was a good linear relationship between acephate concentration and SERS signal intensity in the range of 6.00 × 10 −9 mol L −1 – 8.00 × 10 −7 mol L –1 , and the linear equation was I SERS = 85.02 c + 24712.49 ( r = 0.9982, c : nmol L −1 ) with the limit of detection (LOD) was 3.40 nmol L –1 (3 σ / S ). The SERS method was successfully applied for the detection of acephate residues in vegetable samples, and the recovery was in the range of 95.3% – 104% ( n = 5).
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EUROPEAN POLYMER JOURNAL
·
2026
·
IF 6.8
Zhongwei Sun,Lingrui Xu,Jun Gao,Junyao Li,Guojun Zheng,Laidi Xu,Yong Kong
Multifunctional hydrogel wound dressings are prepared for wound repair. Chitosan (CS)-AgNPs gel beads are first synthesized through electrostatic attractions, which are then co-encapsulated with gallic acid (GA) in the sodium alginate (SA)/gelatin hydrogels prepared by using Ca 2+ as the crosslinker. Due to the antibacterial effects of CS, AgNPs and GA, the resulting SA/gelatin/GA/CS-AgNPs (SGGCA) hydrogels can significantly inhibit the growth of E. coli and S. aureus. On the other hand, the integration of GA can also endow the hydrogels with high antioxidant activity, which show strong scavenging capability for free radicals. In addition, the SGGCA hydrogels also exhibit excellent blood compatibility and cytocompatibility. Finally, the hydrogels are used as wound dressings for in vivo wound repair of mice, and the results demonstrate that the hydrogel wound dressings can effectively promote the healing of wounds.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Ruilin Su,Liangzhong Li,Jiatong Kang,Xinyu Ma,Da Chen,Xiaoyun Fan,Yang Yu
To develop a novel membrane with controllable wettability in response to external stimuli for intelligent oil/water separation is always in urgent demand. In this study, a pH-responsive nanofibrous membrane was prepared through the step-by-step modification of polyvinylidene fluoride (PVDF) electrospun nanofiber membrane , including mussel-inspired self-polymerization of polydopamine (PDA), immobilization of silver nanoparticles (AgNPs) and self-assembly of thiols. A rough membrane surface could be formed by the loading of AgNPs, and the subsequent introduction of HS(CH 2 ) 11 CH 3 /HS(CH 2 ) 10 COOH via metal-thiol coordination could endow the membrane with pH-responsive wettability. The surface of the membrane was able to quickly and reversely switch between superhydrophobicity and superhydrophilicity through simply applying pH stimulus at pH 7 and 13, respectively. The membrane can be applied for separating multiphase oil/water mixtures, achieving separation efficiency of over 99.2% for light oil/water mixture and 96.5% for heavy oil/water mixture with a stable flux of around 2500 L/m 2 ·h for water and 11,000 L/m 2 ·h for oil over the 10-cycle separation process. Meanwhile, the membrane exhibited separation efficiency of higher than 99% for all the tested oil-in-water emulsions, and the water flux of the membrane could be effectively recovered by water rinsing. Moreover, the membrane demonstrated a good structural stability against rigorous mechanical abrasion. The pH-responsive membrane could be potentially applied for smart and energy-saving separation and recycle of oil or water from oily wastewater.
研究领域:
材料科学
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环境工程
·
纳米技术
·
化学工程
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
·
IF 7.1
Shanshan Wang,Minmin Wang,Chuanping Li,Haijuan Li,Chunhua Ge,Xiangdong Zhang,Yongdong Jin
Due to their high catalytic effect on the electrochemiluminescence (ECL) of luminol, noble metal nanoparticles (NPs) have been widely used in luminol-based ECL immunosensors. However the aggregation of NPs often resulted in the decrease of ECL signal and affected the stability and durability of the sensor. In this study, a microflower-like structure made of ultrathin Co/Ni-based metal-organic frameworks (MOF) nanosheets were used as a platform for luminol-functionalized AgNPs to construct an immunosensor for tumor marker alpha-fetoprotein. The nanosheet and microflower-like assembly structure of the Co/Ni-MOF greatly improved the ECL performance of the luminol-AgNPs system, attributed to their large surface area, resistance to particle agglomeration and the high catalytic activity of the Co/Ni-MOF. The ultrathin Co/Ni-MOF was full of atomically dispersed cobalt ions and nickel ions, which can catalyze the ECL reaction of luminol and H 2 O 2 . The as-fabricated immunosensor has a good sensitivity with detection limit of 0.417 pg mL −1 (S/N=3), and shows satisfactory performance in practical applications.
研究领域:
生物医学工程
·
分析化学
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BIOSENSORS & BIOELECTRONICS
·
2018
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IF 8.173
Chen Zhou,Haimin Zou,Ming Li,Chengjun Sun,Dongxia Ren,Yongxin Li
A fiber optic surface plasmon resonance (FOSPR) sensor was developed for detection of Escherichia coli O157:H7 ( E. coli O157:H7) in water and juice, based on antimicrobial peptides (AMP), Magainin I, as recognition elements and silver nanoparticles-reduced graphene oxide (AgNPs-rGO) nanocomposites assisted signal amplification . The uniform AgNPs-rGO was fixed on the surface of optical fiber and covered with gold film. Not only was the SPR response greatly enhanced, but also the AgNPs was prevented from being oxidized. The FOSPR showed a sensitivity of about 1.5 times higher than that fabricated only with gold film. In the assay, Magainin I, immobilized on the surface of gold film, could specifically capture E. coli O157:H7, resulting in the wavelength shift of the SPR absorption peak. Under the optimized conditions, the SPR resonance wavelength exhibited a good linear relationship with natural logarithm of the target bacteria concentration in the range of 1.0 × 10 3 to 5.0 × 10 7 cfu/mL with the detection limit of 5.0 × 10 2 cfu/mL (S/N = 3). The FOSPR sensor showed good specificity for E. coli O157:H7 detection compared to other bacteria similar to the target bacterial species . Furthermore, the FOSPR sensor was successfully applied to the detection of E. coli O157:H7 in water, fruit and vegetable juice with the satisfactory recoveries of 88–110%. This assay for E. coli O157:H7 detection possesses high sensitivity, good selectivity , reproducibility and stability. In addition, the AMP based SPR biosensing methodology could be extended to detect a wide variety of foodborne pathogens. Therefore, the versatile method might become a potential alternative tool in food analysis and early clinical diagnosis.
研究领域:
生物传感技术
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食品安全检测
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微生物学
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Journal of Physical Chemistry C
·
2023
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IF 3.7
Yunrui Han,Yingkuan Han,Qihang He,Hong Liu,Yu Zhang,Lin Han
Low-concentration molecular detection is of great value in chemical analysis, environmental monitoring, biological analysis, and other trace detection fields. Surface-enhanced Raman scattering (SERS) is widely used in the analysis of low-concentration molecules with great potential for biological detection due to nondestructive measurement. However, detection uniformity and repeatability are challenges in the application of SERS, especially as regards ultrasensitive detection. Here, a AgNPs@LIG SERS chip with excellent sensitivity and uniformity was fabricated by electroplating Ag nanoparticles (AgNPs) on a laser-induced graphene (LIG) surface prepared on a polyimide (PI) film, which realized large-scale production with controllable shape and area. Such an SERS chip features a limit of detection (LOD) of 10–14 M, an enhancement factor (EF) of 3 × 1010, and fine uniformity (∼9.6% relative standard deviation) for rhodamine 6G, benefiting from excellent local electromagnetic field enhancement generated by the gap of AgNPs and excellent performance of porous LIG. Finally, the chip was applied to the detection of melamine with the LOD of 10–9 M, which confirmed the potential application value of the SERS chip for pollutant analysis. In addition, the preparation of the composite SERS chip is simple for mass production, which provides great potential for the development of ultrasensitive SERS biosensors for various biological and chemical analyses.
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JOURNAL OF NANOPARTICLE RESEARCH
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2023
·Vol. 25
·期 2
·1-14
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IF 2.5
Ding Jianjun,Ye Li,Su Tong,Guo Naiyu,Yu Linbo,Miao Longxin,Cao Mian,Sun Chao
Surface-enhanced Raman scattering (SERS) features a unique fingerprint spectrum for fast and highly sensitive non-destructive detection without sample pretreatment. Aiming at the problem of few “hot spot” and uneven distribution of traditional SERS substrate, in this work, a surface-enhanced Raman substrate of silica/carbon nanotubes/silver nanoparticles (SiO 2 /CNTs/AgNPs) with high on all sides and low in the middle was synthesized by hydrothermal synthesis. The AgNPs were characterized by transmission electron microscopy (TEM), and the average diameter was 38 nm to 63 nm. The substrate exhibited high sensitivity, stability, and uniformity with a detection limit of 10 −12 M for rhodamine 6G (R6G). Furthermore, we conducted an in-depth research on the enhancement contribution of the substrate by finite-difference time-domain (FDTD); the simulation results were in good agreement with the experimental results. Finally, the substrate was used for the detection of phenol red in water; the results showed that the Raman intensity was exponentially related to the concentration of phenol red solution with the coefficient of determination R 2 = 0.99991, which provided a new method for detecting water pollutants. Graphical Abstract
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FOOD CHEMISTRY
·
2021
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IF 7.514
Zhiwen Qi,Xingying Xue,Hao Zhou,Hua Yuan,Wenjun Li,Guliang Yang,Pujun Xie,Chengzhang Wang
To valorise olive mill wastewater phenols (OPs) potentially applied in food preservation, a novel stable and regularly spherical OPs-AgNPs ( D avg = 78 nm) were successfully assembled in aqueous solution under the optimized conditions (pH 8.0, 5 mM AgNO 3 , 35C and 30 min). The results of antimicrobial zone diameters indicated that 50 μg/mL of promising OPs-AgNPs presented excellent antimicrobial effects. Especially, the cell wall damages of E. coli ATCC 23,815 were caused when OPs-AgNPs concentration was exceeded its MIC (8.58 μg/mL). Also, a significant down-regulating of the Ca 2+ -ATPase activity in E. coli was revealed, and the intracellular Ca 2+ concentrations were thus decreased from 12.5 to 1.35 µg/mL after a treatment for 3 h. The apoptosis level of E. coli was significantly increased more than the control (55.13% of OPs-AgNPs vs 9.90% of control). In sum, OPs exerts enhanced antimicrobial function via penetrating cell membrane and targeting Ca 2+ -ATPase after chelated with AgNPs.
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INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Zijun Zhang,Qimeng Jiang,Guihua Yang,Xv Zhang,Xingmao Jiang,Bo He,Jiachuan Chen
Film preservative packaging is one of common techniques to solve rot problem of fruits and vegetables in transit, storage and sale process. But traditional petroleum-based films have no long-lasting antibacterial properties and they are difficult to biodegrade. Herein, TEMPO-oxidized nanocellulose (TCNF) was used as green reducer and stabilizer to synthesize and immobilize silver nanoparticles (AgNPs) in one-pot method. Next the TCNF immobilized AgNPs was combined with chitosan to form antibacterial preservative composite film (CS/TCNF@AgNPs). The results show that CS/TCNF@AgNPs exhibited satisfied preservative effects for cherry tomatoes and strawberries . Notably, the composite film showed excellent antibacterial properties against E. coli and S. aureus and the accumulated release amount of AgNPs was only about 2.05% after 264 h. Furthermore, the composite film degraded almost completely in soil within 25 days. The cytotoxicity assay also exhibited favorable biocompatibility. Therefore, the composite film has potential application as a packaging material for fruit and vegetable antibacterial preservation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Xu Huang,Yisimayili Tuersun,Pingjun Luo,Haoran Yang,Sheng Chu
Thermally conductive materials are crucial for stable operation of integrated circuits, and there is high interest in improving the thermal conductivity of MXene. This study develops a facile method to enhance the chelating and reducing abilities of MXene towards metal ions by coating a thin layer of polydopamine onto the MXene surface, followed by decoration of silver nanoparticles on the nanosheet surface through in-situ reduction. Naturally abundant nanocellulose fibers were used as the matrix, and continuous thermal pathways were constructed between the fibers by vacuum filtration of the prepared nanofillers. The essential role of AgNPs in providing efficient thermal conductive networks was analyzed using the finite element analysis software. The prepared composite films exhibited an in-plane thermal conductivity up to 7.31 W/m K and demonstrated superior temperature control in heat dissipation tests. At a filler mass fraction of 30 wt%, the average electromagnetic shielding effectiveness of the film with a thickness of 0.17 mm was measured to be 25.8 dB in the X-band, which exceeds the target value for commercial applications. The outstanding performance of the composite paper has demonstrated the great potential of silver-decorated MXene for widespread application in fields such as electronic devices, aerospace, and aviation.
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BIOSENSORS & BIOELECTRONICS
·
2019
·
IF 9.518
Shuang Zhao,Cong Shi,Hongyang Hu,Zhengping Li,Gang Xiao,Qiaochun Yang,Peng Sun,Linyang Cheng,Wencheng Niu,Jinshun Bi,Zhao Yue
In this paper, a portable real-time sensing device was built for Concanavalin A (Con A) and glucose detection using a smartphone. The ion-sensitive field-effect transistor (ISFET) functioning at a low working point was selected as a small-size, low-power transducer, and dextran-capped silver nanoparticles (Dex-AgNPs) served as sensitive nanoprobes on the ISFET gate. Using the affinity between Con A and carbohydrates, Con A can be captured, and thus directly detected by the ISFET/Dex-AgNPs unit; then glucose can be determined indirectly by removing Con A from the ISFET/Dex-AgNPs/Con A unit via competition with dextran . The mechanism of this competition does less harm to the sensor, allows the reusability of the sensing device, and overcomes the Debye screening of the FET device in saline solutions . Powered by a button cell, the handheld device attains excellent Con A (0.16 ng mL −1 ) and glucose (10 nM) detection limit, and can practically be used for at least 20 days.
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CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Yujie Lei,Shilei Wang,Qian Liu,Duan Zeng,Kexing Wang,Cong Chang,Baohui Zhang,Lin Zhang,Zhaohua Shi,Yan Meng
Oriented hydrogels have been recognized for their ability to promote cell proliferation and enhance wound repair. Chitosan, valued for its biocompatibility and biodegradability, is widely used in hydrogel preparation. However, chitosan derived from Periostracum Cicadae (“Chantui”) has not been explored for creating antibacterial-oriented hydrogels. In this study, we successfully developed a Periostracum Cicadae chitosan-based oriented hydrogel (O-CH) using an electro-assembly method. The O-CH hydrogel exhibited superior hemostatic performance and mechanical strength, with stress levels 7.6 times higher than those of traditional alkali-neutralized hydrogels. Subsequently, silver nanoparticles (AgNPs) were formed in situ on the O-CH hydrogel without the need for additional reducing agents or stabilizers, yielding O-CH@Ag20, which exhibited excellent biocompatibility and enhanced antibacterial properties. In an S. aureus -infected full-thickness rat skin defect model, O-CH@Ag20 reduced bacterial counts at the wound site by 6-fold compared to the gauze group on day 3 and achieved a 97 % wound healing rate by day 10, versus 75 % in the gauze group. Histological analysis revealed that O-CH@Ag20 regulated angiogenesis, collagen deposition, and fibroblast differentiation into myofibroblasts, thereby accelerating wound contraction during remodeling. This study presents a novel approach to addressing clinical challenges in infected wound healing using Periostracum Cicadae chitosan-based antibacterial hydrogels.
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