MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Jing Xiao,Dali Zhuo,Jiayuan Tang,Jihong Chen,Chao Tan,Shu Zhang,Shichao Li,Zhirong Zou
The analysis of cyclamate in food samples holds a significant implication for human health, necessitating the development of a selective, sensitive and user-friendly analytical method for analysis of cyclamate. Herein, a pressure meter-based analytical kit was established and applied to selective and sensitive detection of cyclamate. Cyclamate undergoes a selective reaction with NaNO 2 within a hermetically sealed reaction vessel. The reaction produces cyclohexene and N 2 , leading to a discernible pressure change that can be accurately measured using a portable gas pressure meter. Within the concentration range of 20–1000 mg/L, gas pressure values exhibit a proportional relationship with cyclamate concentrations, with a limit of detection of 5.6 mg/L. This analytical kit was further applied to assess cyclamate levels in various beverages and a standard quality control sample (BWQ8791-2016), with recoveries of 93–108 %. It is a simple, easy used, selective and sensitive analytical system for analysis of cyclamate in beverages.
研究领域:
食品安全
·
分析化学
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产品关联
DOI
高影响因子
Food Analytical Methods
·
2013
·Vol. 7
·期 7
·1400-1406
·
IF 1.969
Liu Tenghao,Jiang Zi-Tao,Li Rong,Tan Jin
This paper aims at establishing a rapid method for simultaneous separation and determination of the sweeteners including cyclamate, acesulfame, and aspartame in beverages by titania-based reversed-phase high-performance liquid chromatography. The chromatographic conditions were as follows: a titania Sachtopore-RP C18 column (250 × 4.6 mm; 5 μm) as a separation column, a mixture of water and methanol at a volume ratio of 95:5 containing 1.0 % phosphate acid used as mobile phase, flow rate of 1.0 mL min −1 , and the detection wavelength was 205 nm. The linear ranges of cyclamate and aspartame were 0.02–8.0 mg mL −1 with limits of detection (LODs) of 16.35 and 19.56 μg mL −1 , respectively, and their limits of quantitation (LOQs) were 55.50 and 68.50 μg mL −1 , respectively. The recoveries of cyclamate were between 93.52 and 103.54 %. The recoveries of aspartame were between 93.31 and 102.63 %. The linear range of acesulfame was 0.125–50 μg mL −1 with LOD of 0.08 μg mL −1 and LOQ of 0.25 μg mL −1 . The recoveries of acesulfame were between 94.34 and 103.21 %. Relative standard deviation ( n = 8) for all determinations was less than 0.72 %.
研究领域:
分析化学
·
食品科学
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DOI
高影响因子
Journal of Coatings Technology and Research
·
2019
·Vol. 17
·期 2
·345-359
·
IF 1.584
Peng Zhongkang,Tang Liuyan,Yuan Ye,Qu Jinqing
Abstract A series of N -alkylated aminosulfonic acids (NASAs) were synthesized with 1,4-butane sultone and primary amines and then reacted with hexamethylene diisocyanate trimer to obtain water-dispersible polyisocyanates (WDPs). Two-component waterborne polyurethane (2K-WPU) coatings were finally prepared by the reaction of WDPs and aqueous hydroxyl resins. The structures and properties of WDPs and 2K-WPU coatings were characterized. The effects of the categories and amounts of NASAs on the properties of WDPs and 2K-WPU coatings, including viscosities, water resistance and transparency, were investigated. The results showed that the average molecular weights and viscosities of the WDPs increased with the increase in the amounts and molecular weights of NASAs. 3-(Cyclohexylamino)-1-propanesulfonic acid possesses a high molecular weight, resulting in low-concentration –SO 3 per mass, so a high concentration up to 3.5 wt% was needed to meet water-dispersible requirements. On the other hand, 3-isobutylamino-1-propanesulfonic acid (IBAPS) has high-concentration –SO 3 per mass and only a low concentration (2.5 wt%) was required to offer satisfactory water dispersibility. 2K-WPU film cured by IBAPS-WDP displayed high gloss, good transparency and excellent water resistance owing to suitable steric hindrance and high content of –SO 3 H per mass. Graphic abstract
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2019
·
IF 4.191
Qilin Zhang,Chao Wang,Jianzhen Mao,Shri Ramaswamy,Xueming Zhang,Feng Xu
A bifunctional solid organocatalyst, sulfamic acid, was evaluated to produce furfural from xylose and different biomass in an environmentally friendly system comprising Gamma-Valerolactone (GVL) and water. The highest yield (70.19%) of furfural was achieved in a 90% solution of GVL in water containing 10 mol% of sulfamic acid at 190 °C for 15 min from xylose. The potential mechanism of sulfamic acid efficiently catalyzing xylose isomerization and dehydration is presented for the first time. It is hypothesized that another sulfamic acid form, the zwitterionic unit (H 3 N + SO 3 − ) is crucial in efficiently catalyzing isomerization reaction due to its electron-rich sulfonate being superior in attacking the hydrogen atom on C1 leading to the xylose tautomerization to xylulose, a shorter route to furfural, and finally, the NH 2 SO 3 H with strong acidity also promotes the xylulose dehydration to furfural. The above system was evaluated using various biomass species including corncob, Miscanthus × giganteus , the hull and shell of Camellia oleifera (tea) fruit and Aleurites fordii HemsL. (tung) fruit. Almost all these biomass showed excellent furfural yields (over 70%), with tung shell providing the best yield of 92.19% at 200 °C and reaction time of 30 min.
研究领域:
化学工程
·
催化
·
生物化工
·
可再生能源
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Chunyu Ru,Zhenhua Li,Chengji Zhao,Yuting Duan,Zhuang Zhuang,Fanzhe Bu,Hui Na
Novel side-chain-type sulfonated poly(arylene ether ketone) (SNF-PAEK) containing naphthalene and fluorine moieties on the main chain was prepared in this work, and a new amino–sulfo-bifunctionalized metal–organic framework (MNS, short for MIL-101-NH2-SO3H) was synthesized via a hydrothermal technology and postmodification. Then, MNS was incorporated into a SNF-PAEK matrix as an inorganic nanofiller to prepare a series of organic–inorganic hybrid membranes (MNS@SNF-PAEK-XX). The mechanical property, methanol resistance, electrochemistry, and other properties of MNS@SNF-PAEK-XX hybrid membranes were characterized in detail. We found that the mechanical strength and methanol resistances of these hybrid membranes were improved by the formation of an ionic cross-linking structure between −NH2 of MNS and −SO3H on the side chain of SNF-PAEK. Particularly, the proton conductivity of these hybrid membranes increased obviously after the addition of MNS. MNS@SNF-PAEK-3% exhibited the proton conductivity of 0.192 S·cm–1, which was much higher than those of the pristine membrane (0.145 S·cm–1) and recast Nafion (0.134 S·cm–1) at 80 °C. This result indicated that bifunctionalized MNS rearranged the microstructure of hybrid membranes, which could accelerate the transfer of protons. The hybrid membrane (MNS@SNF-PAEK-3%) showed a better direct methanol fuel cell performance with a higher peak power density of 125.7 mW/cm2 at 80 °C and a higher open-circuit voltage (0.839 V) than the pristine membrane.
研究领域:
材料科学
·
能源化学
·
燃料电池工程
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hongwei Li,Lingmei Wang,Qingyang Du,Conghua Liu,Chao Li,Wuzhu Sun
Nitrate pollution in natural water bodies poses a severe threat to human health and the environment. Developing efficient and environmentally friendly nitrate removal methods has become a global need. Electrochemical techniques offer a cost-effective strategy for nitrate remediation; however, the complexity of the reaction and the formation of multiple by-products make the selective production of harmless nitrogen a challenging task. This study proposes a novel two-step strategy to achieve high efficiency and selectivity in converting nitrate into nitrogen. First, a membrane electrode consisting of silver nanowires (Ag NWs) is used to electrochemically reduce nitrate to nitrite through a direct electron transfer pathway. Whether in a static electrolytic cell or a flow cell, the process has very high nitrite selectivity and Faraday efficiencies, with Faraday efficiency up to 98.40 % and selectivity up to 99.90 % at −1.0 V vs Ag/AgCl. Subsequently, the nitrite is converted into nitrogen through a specific reaction with sulfamic acid with near 100 % conversion and selectivity. By coupling these two reactions, the selectivity for converting nitrate to nitrogen can reach more than 99 %. In addition, the membrane electrode can be readily used in a flow-through electrolytic cell to treat nitrates at a maximum rate of 150 L h −1 m −2 . When operated at 50 L h −1 m −2 , the membrane electrode demonstrates relatively stable performance for 100 h, reducing nitrates at 1.61 mM to below 0.81 mM (50 ppm), as recommended by the World Health Organization for drinking water. This novel synergistic approach not only enhances nitrogen selectivity but also simplifies the process of electrocatalytic nitrate reduction, making it a promising method for nitrate removal.
研究领域:
环境科学
·
电化学
·
水处理
·
材料科学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Shuang Su,Zhiyang Zhang,Jiadong Chen,Yan Chen,Xin Cao,Shuoyang Yan,Ranran Yu,Jie Shao,Xiaokun Wang,Jaebum Choo,Lingxin Chen
On-site detection of hydrogen sulfide (H 2 S), a toxic byproduct of microbial decomposition, is essential for environmental surveys, sewage tracing, and occupational safety. While existing gold nanorods (Au NRs)-based colorimetric methods offer portability and sensitivity, their practicality is hindered by the instability of enzymes and colloidal nanoparticles. Herein, we present an enzyme-free, portable H 2 S detection device using Au NRs powder, ensuring highly sensitive and reliable colorimetric detection while enhancing long-term applicability. The sensing strategy involves two steps: H 2 S microextraction and colorimetric assay. First, H 2 S is accumulated into a NaOH aqueous drop from a complex sample matrix via headspace single-drop microextraction (HS-SDME) using sulfamic acid. In the colorimetric assay, dissolved H 2 S reduces KIO 3 to I 2 in glycine-HCl buffer (pH 2.6), which etches Au NRs in the presence of Br - and CTA + , causing a blue shift in the plasmon band with a distinct color change. This method achieves a visual detection limit of 0.05 µM, approximately 10 times lower than the Methylene Blue method. The use of HS-SDME ensures excellent selectivity against co-existing ions (≥10-fold) and small organic molecules (100-fold). Validation with real samples yielded recoveries of 92.40 %-109.51 %, demonstrating reliability in environmental monitoring and river pollution tracing. To simplify detection, we developed a liquid-free test kit containing an H 2 S microextraction tube (sulfamic acid powder), a colorimetric assay tube (Au NRs powder and solid buffer), and a portable heating device. This enzyme-free sensor ensures long-term stability and practicality, advancing Au NRs-based sensors for environmental monitoring.
研究领域:
环境科学
·
分析化学
·
纳米技术
·
传感技术
·
水污染监测
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产品关联
DOI
PubMed
高影响因子
POLYMER BULLETIN
·
2016
·Vol. 74
·期 4
·1061-1076
·
IF 1.371
Yong Qiwen,Nian Fuwei,Liao Bing,Guo Ying,Huang Liping,Wang Lu,Pang Hao
Self-matt coating of waterborne polyurethane (WBPU) was synthesized by combining prepolymer and self-emulsification methods. The emulsion was fabricated from both hydroxy carboxylic acid and aminosulfonic acid types of hydrophilic chain-extending agents, in which the 2-[(2-aminoethyl) amino] ethane sulphonate sodium (AAS salt) was produced in laboratory. This emulsion demonstrated an excellent matt performance without the addition of extra matting agents after filming. Four different kinds of surface properties were measured on the film: the specular gloss (60° gloss meter), the contact angle (CA), the surface roughness degree (3D Surface Profilometer), and the topography of the coatings surface (SEM). The results showed that tons of spherical particles with diameter in a few micrometers were aggregated on the film surface. The effect of the roughness parameters ( R
a
and R
q
) and the average particle size of the emulsions on the specular gloss degree were probed. The research indicated that the emulsion with average particle size in the range of 2.5–3.0 µm and, meanwhile, the film with roughness parameters R
a
and R
q
both greater than 1 µm could attain the best matt effect. The WBPU emulsions showed good physical and mechanical properties, and were introduced into wood varnish for matting purpose.
研究领域:
材料科学
·
化学工程
·
表面化学
·
高分子科学
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Jierui Ye,Jiamin Wang,Jingyu Li,Yiwei Li,Pan Chen,Junfeng Wang,Yuebing Gao,Qingtian Xu,Qiang Wu,Qian Li
Bamboo holocellulose emerges as a significant candidate in the field of bio-based functional materials, owing to its rapid growth cycle, high strength, and antioxidant properties. However, its flammability poses a significant critical challenge, thereby hindering the widespread application of this carbonized polymer. In this study, we present a straightforward and efficient ternary deep eutectic solvent (TDES) pretreatment strategy. Specifically, the TDES treatment was employed to chemically introduce P/N/S groups into holocellulose and lignin, resulting in the production of flame-retardant holocellulose (HC-SP) and lignin (Lignin-SP), respectively. By adjusting the ratio of these two components, nanosuspensions and nanocomposite films were fabricated through a co-grinding process. The incorporation of Lignin-SP imparted the P/N/S-containing holocellulose nanofibril composite films with exceptional flame retardancy (with a limiting oxygen index exceeding 52.5 %), substantial tensile strength (reaching 152.3 MPa), robust UV-blocking capability (blocking over 98.9 % of UV radiation), and biodegradability (degrading within 70 days). This straightforward preparation strategy for all-biobased green flame-retardant packaging materials holds promising application potential in the fields of flame-retardant food packaging.
研究领域:
材料科学
·
生物基材料
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2025
·Vol. 47
·期 8
·1-20
·
IF 3.8
Hu Zhengchun,Huang Xinrui,Shen Wu,Guo Minghao,Liao Bing
Leakage and migration of landfill leachate are often accompanied by complex biogeochemical processes that form a continuous series of redox zones in the leachate plume. Nitrogen in leachate, especially NH 4 ⁺-N, is one of the most important pollutants contributing to groundwater contamination. While traditional landfill pollution prevention and control measures often have difficulty effectively addressing the complex migration and transformation behaviors of NH 4 ⁺-N in leachate, an in-depth study of the migration and transformation processes of NH 4 ⁺-N in the redox compartment is crucial for the development of accurate and efficient pollution prevention and control strategies. In this study, static transformation experiments, dynamic simulated column experiments and high-throughput sequencing techniques were used to systematically investigate the migration and transformation processes of NH₄⁺-N in the redox bands of a simulated landfill. The results showed that in the NH 4 ⁺-N transformation experiment, the soil in the simulated oxidation zone had the strongest ability to transform NH 4 ⁺-N, with the NH 4 ⁺-N concentration decreasing from 40 to 0.03 mg/L, whereas the sterilization treatment completely suppressed the transformation process of NH 4 ⁺-N in the OZ. The NH 4 ⁺-N in the continuous redox zone completely penetrated the simulated soil column on the 7th day, and the maximum effluent concentration was stable in the range of 1530 ± 30 mg/L. The trends of NH 4 ⁺-N in each independent redox zone were consistent, with the TZ having the richest microbial community abundance and number of species, and some Acidobacteria were able to reduce Fe(III) under anoxic conditions and interact with the organic matter, which effectively contributed to the cycling of Fe within the TZ. These findings indicate that there are significant differences in the biogeochemical cycling process of NH 4 ⁺-N in different redox zone environments, and this study provides a new research perspective for a deeper understanding of the biogeochemical cycling mechanism of the elements in landfills and an important scientific basis for the prevention, control, and remediation of landfill pollution.
研究领域:
环境科学
·
微生物学
·
水文学
·
土壤化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Haoran Zhang,Yuelong Liu,Sanshuang Gao,Haijian Wang,Rui Bai,Yan Zhao,Yingtang Zhou,Guangzhi Hu,Xue Zhao
Green energy-driven electrochemical-nitrate-reduction-reaction (eNitRR) provides an alternative pathway for sustainable ammonia synthesis, but there is still a lack of reliable catalyst. Herein, through the combination of coordination confinement and spatial confinement, single-atom Fe and Fe clusters were simultaneously embedded on nitrogen-doped-hollow-carbon-tubes (Fe/NHCTs) to cooperatively promote the highly selective conversion of nitrate to ammonia in complex water environments. The ammonia yield rate reached 45595.63 μg h −1 mg −1 with Faradaic efficiency close to 100 %. The Zn-nitrate battery with Fe/NHCTs as the core has a high open circuit voltage and power density, and can output electric energy for a long time while highly selective synthesis of ammonia. The pathway and hydrogenation mechanism of nitrate evolution to ammonia were revealed using the in-situ attenuated total reflection Fourier-transform infrared, online differential-electrochemical-mass-spectrometry and density functional theory calculations, the intermodulation of electrons between single-atom Fe and Fe clusters synergistically accelerates the conversion of nitrate to ammonia.
研究领域:
材料科学
·
电催化
·
能源化学
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产品关联
DOI
高影响因子
Science China-Materials
·
2025
·
IF 7.4
Zhao Weidong,Zheng Mengfei,Chu Hongyu,Zhang Jingxuan,Wang Kun,Yang Chenguang,Shen Na,Tang Zhaohui
β-Lapachone (β-Lap) is a promising ortho -naphthoquinone drug for cancer treatment and has been in clinical trials. Its application is constrained by the low aqueous solubility, and severe side effects. Even prodrug designation is an effective approach to render it with tumor selectivity, it is limited by the lack of modifiable groups on β-Lap. Herein, a novel azo bond primary cleavage and carbon–carbon (C–C) bond secondary cleavage-based polymeric β-Lap prodrug (Azo-Lap NP) is designed, in which the self-immolated para -aminobenzyl linker is connected to poly( l -glutamic acid) (PGlu) via azo linkage and the responsive drug release of β-Lap against tumors can be achieved under high NAD(P)H:quinone oxidoreductase 1 (NQO1) expression and low pH environment in tumors. The effective covalent loading of β-Lap by Azo-Lap NPs permitted a high administration dose of β-Lap and enabled significant tumor retention time. Moreover, Azo-Lap NPs markedly reduced the side effects of β-Lap by avoiding hemolysis and the production of methemoglobin. The safety of Azo-Lap NPs administration is validated in the antitumor experiment of mice. In the 4T1 model, Azo-Lap NPs exhibited a markedly higher tumor suppression rate than β-Lap. This work provides an effective and safe polymeric prodrug for tumor selective delivery of β-Lap.
研究领域:
药物化学
·
肿瘤学
·
生物医学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）