JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Zhifeng Cai,Guiyu Meng,Yanan Li,Yingjie Zhou
Sulfur-doped carbon dots (S-CQDs) in the light of cabbage leaves were suggested through using a one-pot hydrothermal strategy. The cysteine was used as a sulfur dopant. Transmission electron microscope (TEM) suggested that the morphology of S-CQDs was highly dispersed and the particle size distribution range was located at 3.2–3.8 nm. Four elements (C, N, O and S) could be observed through X-ray photoelectron spectroscopy (XPS). Some oxygen-containing and amino-containing groups could also be indicated by using Fourier transform infrared spectroscopy (FT-IR). The S-CQDs suggested bright blue fluorescence under UV light. At the same time, the S-CQDs displayed exceptional anti bleaching property and salt resistance under UV light and NaCl solution, respectively. Moreover, the S-CQDs could be applied as excellent fluorescent nanoprobes to detect alizarin based on the fluorescence quenching strategy. The linear detection range was 0.5–100 μM with the detection limit of 0.14 μM. The fluorescence quenching principle was thoroughly studied based on the related characterizations. The behavior of the detection platform was studied in actual samples by using tap water, Yili milk and iced black tea samples. Finally, the S-CQDs could be applied for the sensing of temperature.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Quanliang Li,Xiaomeng Wang,Jing Ren,Ping Chen,Dayong Ren
Rapid and reliable quantification of meat freshness is crucial for consumer health and food safety. In this study, two simple and portable photosensitive colorimetric cards were fabricated for rapid on-site detection of meat freshness. The colorimetric cards were prepared by dispersing Rose Bengal (RB) into sodium acetate-acetic acid and sodium citrate-citric acid buffer systems containing 3,3′,5,5′-tetramethylbenzidine (TMB) and fixed on filter paper, respectively. The hue of the colorimetric cards was intimately correlated with the amount of volatile base nitrogen absorbed from meat, by which the quality of the meat can be visualized qualitatively. Correlation analysis of total volatile basic nitrogen (TVB-N), red: blue ratio (R/B), total color difference (ΔE), and response sensitivity (S%) demonstrated the accuracy of the proposed colorimetric cards. Principal component analysis (PCA) revealed that the first two principal components of the photosensitive colorimetric cards explained 95.4 %, 93.2 %, 92.9 %, and 87.8 % of the variance of sodium acetate-acetate colorimetric card, and 73 %, 87.9 %, 87.1 %, and 92 % of sodium citrate-citric card, respectively, which allowed for a clear differentiation of meat freshness including freshness, sub-freshness, and spoilage. The prepared photosensitive colorimetric cards can accurately reflect meat quality within 4 min. The proposed colorimetric cards are expected to be a prospective universal platform for on-site accurate quantification of meat freshness.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Wanyu Tian,Lele Qiu,Shuhui Zhou,Jian Xiao,Jing Liang,Fangjing Liu,Yunpeng Zhao
Passivation treatment for perovskite films has constituted an indispensable process in fabricating high-performance perovskite solar cells (PSCs), yet the degradation or dynamic evolution of passivation layers under external stimuli persists as a critical bottleneck impeding commercialization. Here, we develop a silicon phthalocyanine-engineered ammonium cation (SiPc(4HTy)2) that enables perovskite films to resist degradation under thermal stress and meanwhile reinforces the related heterointerfaces in PSCs. The surface passivation strategy based on SiPc(4HTy)2 efficiently reduces surface defects of perovskite films, optimizes energy level alignment, and suppresses ion diffusion, without relying on the formation of two-dimensional perovskite passivation layers. The superior passivation efficacy originates from the solution-processable bulky cation engineering achieved by axially coordinating three-dimensional silicon phthalocyanine. Under the passivation treatment of SiPc(4HTy)2, the power conversion efficiency of PSCs reaches a maximum of 23.55%, mainly due to the improvement of the open-circuit voltage and fill factor. Furthermore, benefiting from the maintenance of the morphology and optoelectronic properties of perovskite films, the related devices still maintain more than 80% of their initial performance after over 1000 h at 85 °C in an inert atmosphere.
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高影响因子
EUROPEAN POLYMER JOURNAL
·
2025
·
IF 6.3
Wenlin Zhang,Guopeng Li,Cheng Yi,Haihua Zhou,Bingxin Huang,Jiahua Meng,Yongjin Zou,Chuanguo Ma,Yuqi Liu
It is a major challenge to develop biobased thermosetting resins with excellent comprehensive performance. Rational molecular structure design is the key to solve the problem. Two biobased benzoxazine monomers, ST-ac and ST-an, were synthesized from salicylaldehyde, tyramine, paraformaldehyde, 3-ethynylaniline or 2-aminobenzonitrile, respectively. Both monomers exhibited excellent processability. The cured resins, poly(ST-ac) and poly(ST-an), were prepared by ST-ac and ST-an respectively. Both two cured resins exhibit superior heat-resistance, thermal stability, flame retardancy, and dielectric properties. These characteristics are attributed to the synergistic interaction between the flexible ethylidene chain segment and the incorporated rigid structural group. Specifically, the glass transition temperatures of poly(ST-ac) and poly(ST-an) are 375 and 236 ℃, the initial thermal decomposition temperatures are 370 and 369 ℃, the heat release rates are 118.4 and 147.3J/g·K, the total heat release amounts are 11.0 and 14.5 kJ/g, the vertical burning test are both UL-94 V-0 rating, and the dielectric constants at 10 GHz are 2.54 and 2.95, respectively. Among them, the overall performance of poly(ST-ac) surpasses that of poly(ST-an), primarily due to differences in the alkynyl and nitrile group curing reactions. The resin developed in this study demonstrates potential for application in high-frequency and high-speed electronic information materials.
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FOOD CHEMISTRY
·
2025
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IF 9.8
Chunfeng Zhang,Yuandong Lin,Kevin M. Keener,Jun-Hu Cheng
The exploration of cost-effective methods for monitoring aquatic products freshness is significant. Metal nanoclusters (MNCs) show considerable potential in detecting food spoilage. A ligand modification strategy has been proposed as an effective approach for preparing high-performance MNCs. In this study, polyvinylpyrrolidone (PVP) and methylthioxanthine (MTU)-capped copper nanoclusters (PVP-MTU-CuNCs) with high quantum yield (43.76 %) were synthesized using an eco-friendly one-pot method. PVP improved the electron transfer and restricted the motion of MTU, enhancing photoluminescence, while its long-chain formed a physical barrier, effectively improving dispersibility and stability. PVP-MTU-CuNCs exhibited a satisfactory responsiveness to volatile basic nitrogens (VBNs), with detection limits of 0.34, 0.36, 0.33, 3.23, and 3.45 ppm for spermine, spermidine, histamine, cadaverine, and ammonia, respectively. An intelligent fluorescent label was developed for ammonia sensing and achieved visual semi-quantification and real-time tracking of the freshness of sea bass and shrimp, demonstrating its practical potential in assessing aquatic products freshness
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Lingcan Kong,Haixin Chen,Qiaoyan Liu
Excessive intake bioamines is harmful to human health, and thus the development of simple, rapid and efficient detection method of bioamines in food is urgent. Herein, an unprecedented method based on a commercial molecular sieve has been developed for the determination of four bioamines (cadaverine, tyramine, histamine and tryptamine) in fruit wines by dispersive solid phase microextraction (D-μSPE) coupled to liquid chromatography-triple quadrupole tandem mass spectrometry (LC-MS/MS). The extraction process of ultra-stable Y-type molecular sieve (USY) on bioamines belongs to physisorption, and the adsorption pattern is found in good accord with the Langmuir isotherm model. Theoretical and experimental analyses are further used to explore their binding energies, binding constants, and the maximum adsorption capacity. It is found that the adsorption is driven mainly by hydrogen bonds between USY and bioamines and water molecules. Moreover, the extraction efficiency is dependent on the binding constants and the maximum adsorption capacity of USY. The optimization of adsorption-desorption process involves the USY amount, extraction time, desorption solvent, desorption time, desorption number and cyclic usage number of USY. Under the optimum conditions, the limits of detection and quantification were found in the range of 0.2–2.5 μg L −1 and 0.6–8 μg L −1 with intra-day and inter-day precision and recoveries in a fruit wine in the range of 1.3 %–7.9 % and 91 %–104 %, respectively. Owing to the efficient enrichment and edulcoration functions of USY, the method shows negligible matrix effect and is simple, rapid, and has the potential to apply in routine work.
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AMB Express
·
2021
·Vol. 11
·期 1
·1-11
·
IF 3.298
Zhao Yirui,Sang Xue,Hao Hongshun,Bi Jingran,Zhang Gongliang,Hou Hongman
Controlling the content of biogenic amines (BAs) is critical to guarantee the safety of fermented aquatic products. The degradation characteristics and application potential of amine-negative starter cultures ( Virgibacillus halodenitrificans CGMCC 1.18601: G25 , Virgibacillus pantothenticus CGMCC 1.18602: G38) screened from grasshopper sub shrimp paste (Gssp) were studied. The enzymes of the two strains G25 and G38 that degrade BAs were amine oxidases (AOs) located on their respective cell membranes. The conditions that promoted the AO activity of Virgibacillus spp. were NaCl concentrations 5–10%, temperature 37 °C, pH 7.0 and ethanol concentrations 0–2%. Safety assessments (antibiotic susceptibility, biofilm activity and hemolytic activity) indicated that Virgibacillus spp. do not present a risk to human health, and this isolate can be confidently recommended as safe starter cultures for the food industry. Then, the two strains were cultured separately as starters and applied to the Gssp to analyze their influence on the flavor and quality of the product. As far as the bad flavors in Gssp such as sulfur-organic and sulf-chlor were concerned, the response values in the starter groups by G25 and G38 were significantly reduced by 39% and 65%, respectively. For the ability of strains to degrade BAs in Gssp, G25 degraded 11.1% of histamine, 11.3% of tyramine, 15.5% of putrescine and 4.1% of cadaverine; G38 significantly degraded 10.1% of histamine, 21.8% of tyramine, 18.1% of putrescine and 5.0% of cadaverine. These results indicated that the selected species could be used as starter cultures for the control of BA accumulation and degradation in Gssp.
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TALANTA
·
2019
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IF 4.916
Huihui Wang,Yunyun Lu,Lun Wang,Hongqi Chen
A selective, simple and environment-friendly type fluorescence sensing platform between upconversion nanoparticles (UCNPs) and melanin-like polymer utilizing the photoinduced electron-transfer (PET) mechanism was developed. The effective fluorescence quenching of UCNPs by melanin-like polymers could detect tyramine and tyrosinase (TYR) activity through the bio-catalysed oxidation of tyramine to the melanin-like polymer products. At optimal conditions, the range of linearity in detection was 0.167–33.3 μΜ for tyramine, and the limit of detection of tyramine was 0.026 μΜ. The linear range of TYR was 0.0033–1 U·mL −1 , and the limit of detection of TYR was 0.003 U·mL −1 . Furthermore, the strategy could be applied to real sample analysis with satisfactory results.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yan Zhou,Jinlong Wang,Wangni Meng,Lian Xia,Yue Tang,Jianli Zhou,Yuangen Wu,Pengcheng Yan
Acetamiprid (ACE), a neonicotinoid pesticide broadly used in agricultural production, can accumulate in the food chain due to excessive or incorrect use, thereby posing a threat to human health. In this manuscript , a colorimetric aptasensor assisted by a smartphone was established, relying on the S-18 aptamer-mediated amplification of the laccase-mimic activity of spherical Ag 2 O nanoparticles (NPs). The S-18 aptamer strengthens the interaction and facilitates electron transfer between the Ag 2 O NPs and oxidative substrates, which significantly improves the laccase-mimic activity of the Ag 2 O NPs. When acetamiprid is present, the S-18 aptamer preferentially binds to the target molecule, forming a steady aptamer-acetamiprid complex. This binding interaction prevents the aptamer from promoting the catalytic behavior of the Ag 2 O NPs, producing a distinct and quantifiable color variation in the reaction system. Monitoring the concentration-dependent colorimetric response enables the quick and accurate identification of acetamiprid. The colorimetric aptasensor achieved a limit of detection (LOD) of 8.69 μg∙L −1 markedly lower than the maximum residue limits defined by the national standard (GB 2763–2019) for acetamiprid in fruits and vegetables. Furthermore, the aptasensor demonstrates satisfactory recovery rates in actual samples analyses of cabbage, apple, and tomato, confirming its practical potential for on-site food safety oversight.
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TALANTA
·
2024
·
IF 5.6
Lichen Gou,Ling Li,Siqi Wei,Yunfei Tian,Xiandeng Hou,Li Wu
Herein, the surface-enhanced Raman scattering (SERS) platform was combined with an azo coupling reaction and an aluminum alloy covered with a hydrophobic layer of praseodymium oxide and stearic acid complexes for the detection of histamine. The praseodymium oxide on aluminum alloy was successfully synthesized by the rare-earth-salt-solution boiling bath method and modified by stearic acid. Its surface exhibits a water contact angle (WCA) of 125.0°. Through the azo derivatization reaction with 3-amino-5-mercapto-1,2,4-triazole (AMTA) diazonium salts, histamine can be converted into the derivatization product with higher Raman activity. The mixture of the derivatization product and β-cyclodextrin-modified Ag nanoparticles (β-CD-AgNPs) were dropped onto the surface of an aluminum alloy covered with a hydrophobic layer of praseodymium oxide and stearic acid complexes, and dried for SERS measurement. The intensity ratio between the SERS peaks at 1246 cm −1 and 1104 cm −1 (I 1246 /I 1104 ) of the derivatization product was used for the quantification of histamine. Under the selected conditions, the limit of detection (LOD) and the limit of quantification (LOQ) for this method were 7.2 nM (S/N = 3) and 24 nM (S/N = 10), respectively. The relative standard deviation (RSD) of this method for the determination of 1 μM histamine was 6.1 % (n = 20). The method was also successfully used for the determination of histamine in fish samples with recoveries ranging from 92 % to 111 %. The present method is simple, sensitive, reliable, and may provide a new approach for preparing the composite hydrophobic layer that can enhance SERS signals through hydrophobic condensation effect. Meanwhile, it may have a promising future in the determination of small molecular compounds containing an imidazole ring.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Gan Wu,Zhaoyang Ding,Xilin Dou,Ze Chen,Jing Xie
Histamine has been known as a momentous cause of biogenic amine poisoning. Therefore, the content of histamine in foods is strictly required to be controlled within a certain range. Here, an aptamer fluorescent sensor was developed for detection of histamine. Poly [(9, 9-di-n-octylfluorenyl-2, 7-diyl)-alt-(benzo [2,1,3] thiadia-zol-4, 8-diyl)] (PF8BT) and the styrene maleic anhydride copolymer (PSMA) were used for the preparation of PF8BT-Polymer dots (PF8BT-Pdots). PF8BT-Pdots and the cyanine3-phosphoramidite (Cy3) were linked through aptamer to achieve the ratiometric detection for histamine. PF8BT-Pdots were partly quenched by Cy3 due to the fluorescence resonance energy transfer (FRET), when the histamine molecule was recognized by aptamer on the surface of PF8BT-Pdots. A linear range (3–21 μmol/L) was obtained for histamine detection with a low limit of detection (LOD = 0.38 μmol/L). PF8BT aptamer Pdots (PF8BT-A) were used to detect histamine in simply treated aquaculture water and tuna. The cell imaging of HeLa cells presented a good biosecurity and outstanding fluorescent imaging capability of PF8BT-A. The aptamer fluorescent sensors provided a new platform for rapid and accurate detection of histamine in aquatic products and had great potential for the application in food safety and quality control.
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Food Bioscience
·
2025
·
IF 5.9
Hongwei Zhan,Xiang Zou,Jiao Li,Lixiu Zhang,Guanyuan Qu,Yanqing Li,Yongjun Sun,Wenming Ju,Mengqi Ye,Yang Deng,Ting Ding
Pseudomonas fluorescens is a prevalent spoilage bacterium in various chilled aquatic products, producing toxic biogenic amines (BAs) through the decarboxylation of amino acids via amino acid decarboxylases. Our previous studies revealed that P. fluorescens PF12 regulates BA production through its quorum sensing (QS) system, suggesting that disrupting QS could be a potential approach to control BA generation. In this study, we targeted the three-dimensional structure of the LuxI-type protein in P. fluorescens PF12 to screen for QS inhibitors (QSIs) through high-throughput screening from Seaweed Metabolite Database and Comprehensive Marine Natural Products Database. Nine compounds with high binding scores to the LuxI-type protein were identified. Considering cost-effectiveness and safety, phytol was selected for further investigation. Experimental results demonstrated that sub-inhibitory concentrations of phytol significantly suppressed BA production, siderophore production, motility, extracellular protease secretion, and biofilm formation in P. fluorescens PF12. Specifically, when the salmon fillets were stored for 288 h, the histamine content in the fillets treated with 25 mg/mL phytol decreased by 43.81 %. RT-qPCR revealed that the expression levels of key genes hisD and hisC related to histamine synthesis in the phytol treatment group were reduced by 7.68 ( p < 0.05) and 8.23 % ( p < 0.05), respectively, compared to the control group. Molecular docking analysis revealed that phytol interacts with key residues in the LuxI-type protein, thereby blocking the synthesis of acyl-homoserine lactones (AHLs) and downstream QS signaling. These findings indicate that phytol has great potential for controlling BA production in aquatic products and ensuring food safety.
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危险品化学品经营许可证（带存储）