Food Chemistry-X
·
2024
·
IF 6.5
Hua Zheng,Linlin Feng,Zheng Huang,Ziwei Zou,Xiaolong Ma,Ziping Pan,Jinfeng Li,Jinxia Wu,Mei Li,Zhiheng Su
Aflatoxin B1 (AFB1) is a potent toxin in food, necessitating rapid, instant, and sensitive detection. We have engineered an electrochemical sensor to monitor AFB1 using a system composed of Fe 3 O 4 -NH 4 /AuNPs/apt-S1. The aptamer specifically recognizes AFB1, while ‘S1’ is functionalized with methylene blue to enhance the current. The RecJf exonuclease promotes the formation of the electrochemical strategy. The Fe 3 O 4 component, with its magnet properties, enables a rapid separation of solids and liquids without the need for instrumentation. The sensor exhibits a linear range for AFB1 ranging from 1 ng to 10 μg. The regression equation is I(nA) = 446.8 × logc+2085 (where I and c represent the peak current and AFB1 concentration, respectively). The correlation coefficient is 0.9508, and the detection limit is 3.447 nM. The relative standard deviation of AFB1 in peanut oil ranges from 4.80% to 6.80%. These results demonstrate that the sensor has high sensitivity, stability, repeatability, and specificity for AFB1 detection.
研究领域:
食品安全
·
分析化学
·
电化学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IONICS
·
2024
·
IF 2.4
Thuy Nguyen Thi Dieu,Han Yu,Wang Xiaochan,Zhao Guo
Potentiometric NH 4 + sensors were developed by modification of ion-selective electrodes with different metal oxide nanomaterials forming solid-contact layers, including titania (TiO 2 ), manganese dioxide (MnO 2 ), and stannic oxide (SnO 2 ). A potentiometric method was used to determine the basic analytical parameters of the sensors. Furthermore, electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and water layer tests were used to evaluate the electrochemical features of the electrodes. The results for the modified metal oxides and unmodified electrodes were compared, and the effectiveness of each material as a solid-contact layer on the electrode was evaluated. The best results were found for an electrode with a solid-contact layer of SnO 2 nanomaterial (GCE/SnO 2 /NH 4 + -ISM). The GCE/SnO 2 /NH 4 + -ISM electrode displayed a selective and fast response to NH 4 + ions (4.8 s) during the potential measurements. In this case, a slope of 47.17 mV/decade ( R = 0.99), a linearity range of 1 × 10 −7 –1 × 10 −2 M, and a limit of detection of 1.18 × 10 −8 M were obtained. This electrode exhibited good reproducibility, a high potential response, and stability, making it an attractive alternative for the development of effective SC-ISEs to detect NH 4 + in aquaponic nutrient solutions.
研究领域:
电化学
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环境科学
·
农业工程
·
纳米技术
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 7
·2107-2114
·
IF 7
Qin Wang,Jinxuan Ren,Dan Wang,Liling Cao,Xuehua Dong,Ling Huang,Daojiang Gao,Guohong Zou
Two fluorine antimony nitrates named (NH4)3SbF3(NO3)3 and (NH4)3SbF4(NO3)2 have been successfully synthesized by a low temperature molten salt method. Although these two title compounds possess NO3− groups and similar Sb-polyhedra, they exhibit completely different macroscopic centricities, (NH4)3SbF3(NO3)3 being noncentrosymmetric while (NH4)3SbF4(NO3)2 being centrosymmetric, which is induced by the discrepant coordination environments of Sb3+. Interestingly, the noncentrosymmetric (NH4)3SbF3(NO3)3 exhibits a strong second harmonic generation response (3.3 × KDP), a large birefringence (0.098@546 nm) and a large band gap (3.77 eV), indicating its potential as a UV nonlinear optical material. Detailed structure–property analysis confirms that the superior optical property is due to the synergistic effect of the planar π-conjugated NO3− groups and the stereochemically active lone pair containing Sb3+ cations.
研究领域:
无机化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Sustainability
·
2021
·Vol. 13
·期 1
·434
·
IF 3.251
Kunlun Wang,Qian Hu,Yumin Wei,Hui Yin,Changhong Sun,Guizhong Liu
The emergent plants may differ in their capacity to assimilate nutrients from eutrophic water bodies, so the utilization of suitable emergent plants is the key part for successful restoration of shallow eutrophic lakes and rivers. This research applied the depletion method to study the kinetics of uptake of nutrient (H2PO4−,NH4+,NO3−) in different nutrient stresses by the five emergent aquatic plants (Acorus calamusL.,Typha orientalis, Lythrum salicariaL.,Sagittaria trifoliaL.,Alisma plantago-aquaticaLinn) in the riverine zones of Dashi River (39°30′–39°40′ N, 115°59′–116°5′ E), a shallow eutrophic river located in Fangshan District, Beijing. The results showed that at the three phosphorus levels,A. calamusandA. plantago-aquaticahad the highest maximum uptake rate values forNH4+under low to moderate phosphorus conditions, and high phosphorus, respectively.T. orientalishad the highest maximum uptake rate values forNO3−at all phosphorus concentrations, while the Michaelis-Menten constant values ofL. salicariaandA. plantago-aquaticawere smaller. At the three nitrogen levels, the maximum uptake rate values forH2PO4−were the greatest forA. plantago-aquaticaat the low to moderate nitrogen levels andL. salicariaat high levels. Meanwhile,T. orientalisandL. salicariahad the smallest Michaelis-Menten constant values. In this study, nitrogen microbial transformations, such as nitrification, denitrification and their coupling were not measured and their role in measuring kinetics was not assessed. Thus, achieved results shall be considered as a synthesis of several processes mediated by plants, a theoretical guidance to the selection of plant species for phytoremediation of polluted water bodies with different nutrient stresses for quality improvement around the diverse rivers in Haihe River basin.Keywords:emergent plants;eutrophication;nitrogen;phosphorus;uptake kinetics;stress
研究领域:
生态学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 80
·76251-76258
·
IF 3.289
Luqing Xi,Yuexiao Pan,Shaoming Huang,Guokui Liu
The synthesis procedures of red phosphors activated by Mn4+ that are carried out especially at room temperature, are significant to industrialization. Herein, we report a facile strategy to obtain two red micro-crystal phosphors: (NH4)2TiF6:Mn4+ (NTF:Mn) and (NH4)2SiF6:Mn4+ (NSF:Mn) through ion exchange at room temperature for a few hours. Raw materials NTF and NSF act as host lattices of red micro-crystal phosphors, and activator Mn4+ ions are from K2MnF6/HF and/or mixed KMnO4/HF solution. The reaction mechanism for the synthesis process has been comprehensively discussed in detail. The typical red emitting luminescence of Mn4+ with strong absorption in the blue region and the large size of about 200 μm of red micro-crystal phosphors NTF:Mn make it an attractive candidate material as a red compensator for resin-free white light-emitting diodes with high color rendering index. The dependence of emission intensity on concentration of HF and KMnO4, and measurement temperature has been investigated. The advantage of the proposed strategy is the ability to explore Mn4+ doped red phosphors from low-cost starting materials at room temperature for large scale industrial applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2012
·
IF 1.693
Yuan-Yuan Che,Jian Shen,Jun-Chao Zhou,Chao-Hong He
The thermal conductivity of ammonium sulfate + water, ammonium nitrate + water, and ammonium sulfate + ammonium nitrate + water is of great significance in the national defense industry and military engineering for manufacturing of various energetic chemicals. The measurements, covering a temperature range from (278.15 to 333.15) K, have been performed by a transient hot-wire technique over a wide range of concentrations. The densities of ternary aqueous solutions of ammonium sulfate + ammonium nitrate are also presented at the same temperature covering different portions of ammonium sulfate and ammonium nitrate. The thermal conductivities of binary aqueous solutions of ammonium salts are correlated by polynomial functions in terms of temperature and weight fraction for the purpose of interpolation. The Aseyev equation in terms of weight fraction is also used to represent the thermal conductivities of ternary mixtures of these compounds. The ideal mixing rule of Young has been successfully applied to correlate the ternary densities of aqueous ammonium sulfate + ammonium nitrate solutions based on relevant binary solution properties. The agreement between the correlation and the experimental data is pretty good.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
SCRIPTA MATERIALIA
·
2021
·
IF 5.611
Lei Meng,Chu Xin Peng,Chen He,Fei Yen
The polarity of the magnetic susceptibility χ( T ) of ammonium alum NH 4 Al(SO 4 ) 2 •12H 2 O single crystals below its ferroelectric Curie temperature T C is identified to depend only on the cooling rate. To explain this, we consider reorienting distorted NH 4 + to carry weak magnetic and electric dipole moments that are linearly coupled. Slow cooling allows the dipole moments to align which enhances χ( T ) to become positive. However, due to energy degeneracy of rotational motion and geometric frustration of the NH 4 + , faster cooling rates render the system to become an orientational glass state causing χ( T ) to remain negative. Specific heat measurements also show the presence of excess entropy below a negative anomaly near 53 K. Our findings identify a possible new class of non-equilibrium system with potential applications in non-volatile memory devices.
研究领域:
物理学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Yuankun Ye,Xiaoyang Wei,Li Zhang,Sen Wang,Zhi Fang
Sustainable nitrogen fixation driven by renewable energy sources under mild conditions has been widely sought to replace the industrial Haber-Bosch process. The fixation of nitrogen in the form of NO x − and NH 4 + into aqueous solutions using electricity-driven gas–liquid discharge plasma is considered a promising prescription. In this paper, a scalable bubble discharge excited by nanosecond pulse power is employed for nitrogen fixation in the liquid phase. The nitrogen fixation performance and the mechanisms are analyzed by varying the power supply parameters, working gas flow rate and composition. The results show that an increase in voltage and frequency can result in an enhanced NO 3 − yield. Increases in the gas flow rate can result in inadequate activation of the working gas, which together with more inefficient mass transfer efficiencies can reduce the yield. The addition of O 2 effectively elevates NO 3 − production while simultaneously inhibiting NH 4 + production. The addition of H 2 O vapor increases the production of OH and H, thereby promoting the generation of reactive nitrogen and enhancing the yield of nitrogen fixation. However, the excessive addition of O 2 and H 2 O vapor results in negative effect on the yield of nitrogen fixation, due to the significant weakening of the discharge intensity. The optimal nitrogen fixation yield was up to 16.5 μmol/min, while the optimal energy consumption was approximately 21.3 MJ/mol in this study. Finally, the mechanism related to nitrogen fixation is discussed through the optical emission spectral (OES) information in conjunction with the simulation of energy loss paths in the plasma by BOLSIG + . The work advances knowledge of the effect of parameter variations on nitrogen fixation by gas–liquid discharge for higher yield and energy production.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2015
·
IF 2.046
Hui Liu,Chun Hua,Changhua Song,Shifeng Dai,Hongwei Wang,Wenshuai Zhu,Huaming Li
Some sulfur oxyacid salts with weak acidity or alkalinity, including Na 2 SO 4 , (NH 4 ) 2 SO 4 , (NH 4 ) 2 S 2 O 3 and Na 2 S 2 O 3 , were applied to the conversion of fructose to 5-hydroxymethylfurfural. The results indicated that (NH 4 ) 2 S 2 O 3 had excellent catalytic performance for the conversion of fructose. A desired HMF yield of 81.6% was obtained with only 5 mg (NH 4 ) 2 S 2 O 3 as the catalyst in [Bmim]Cl at 120 °C for 50 min. Furthermore, the HMF yield remained at 76.6% with 60 wt% water in the IL–water mixture solvent. In addition, the system of (NH 4 ) 2 S 2 O 3 and [Bmim]Cl exhibited a constant stability and activity, and a good HMF yield was maintained after nine recycles.
研究领域:
生物化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Environmental Progress & Sustainable Energy
·
2012
·Vol. 32
·期 3
·564-568
·
IF 1.649
Wei-guo Pan,Rui-tang Guo,Xiao-bo Zhang,Jian-xing Ren,Qiang Jin,Hong-jian Xu
The absorption process of NO into KMnO 4 /(NH 4 ) 2 CO 3 solutions was studied in a stirred tank reactor. The experimental results showed that the reaction process was a fast pseudo-m reaction. The reaction between NO and aqueous solutions of KMnO 4 /(NH 4 ) 2 CO 3 was found to be first-order with respect to NO and with respect to KMnO 4 . The frequency factor and the average activation energy of this reaction were 2.3 × 10 9 m 3 /(mol s) and 36.77 kJ/mol, respectively. © 2012 American Institute of Chemical Engineers Environ Prog, 32: 564–568, 2013
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Zhilin Li,Qiaoqiao Li,Mengyan Cao,Liujiang Zhou,Xiujian Zhao,Xiao Gong
Metal halide perovskite materials have highly attracted wide attention for lighting applications because of their unique optoelectronic properties. However, the complex preparation processes and the toxicity of lead have limited their practical applications. There are few reports on zero-dimensional (0D) organic/inorganic tin-based perovskites with both good stability and a high photoluminescence quantum yield (PLQY). Here, Sb3+ doping and Bi3+ doping of 0D (NH4)2SnCl6 perovskite powders are reported. Sb3+ doping of 0D (NH4)2SnCl6 perovskites shows wide emission peaks at 530 and 640 nm with a PLQY of up to 17.03%, while Bi3+ doping of 0D (NH4)2SnCl6 perovskites exhibits a broad blue emission at 460 nm with a PLQY of 4.40%. Combining experimental results and theoretical calculations, we propose that the mechanism of Sb3+ ion doping of 0D (NH4)2SnCl6 perovskites is a P1 → 1S0 transition (singlet) at 530 nm and a 3P1 → 1S0 transition (triplet) at 640 nm. However, the mechanism of Bi3+ ion doping of 0D (NH4)2SnCl6 perovskites is a 3P1 → 1S0 transition at 460 nm. In addition, both metal ion dopings of 0D (NH4)2SnCl6 perovskites have good air and thermal stability. We demonstrate that the Sb3+ doping and Bi3+ doping of 0D (NH4)2SnCl6 perovskite phosphors have great potential for solid-state lighting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2018
·
IF 4.841
Yongheng Xiong,Yiqing Zeng,Wei Cai,Shule Zhang,Jie Ding,Qin Zhong
The effects of various factors on the NO removal activity in the (NH 4 ) 2 SO 3 solution were investigated to explore more details and characteristics of the related reactions using full infrared sensor flue gas analyzer (FISFGA). It was found that the conversion yield of NO (9.0%–29.0%) was obviously improved with the increase of gas–liquid contact area, NO residence time and (NH 4 ) 2 SO 3 concentration as well as the adding of CuSO 4 . However, it was mainly limited by gas–liquid mass transfer rate and slightly inhibited by the gas velocity. Moreover, the FISFGA analysis revealed that two nitric oxide (NO) conversion route with different reduction product of N 2 O and N 2 existed simultaneously upon the existence form of SO 3 2− . It was confirmed by the calculations and the experiments of pH factor that the NO reduction steps were based on the following equation: (1) NO + HSO 3 − ⇋ N 2 O + SO 4 2− + H + ; (2) NO + SO 3 2− ⇋ N 2 + SO 4 2− . In this system, Eq. (1) with N 2 O product was the major pathway, but the ratio of Eqs. (2) to (1) was intensified in the presence of CuSO 4 . It is believed that the suitable additives could promote the NO reduction to N 2 furtherly.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）