APPLIED ORGANOMETALLIC CHEMISTRY
·
2012
·Vol. 26
·期 11
·600-603
·
IF 2.061
Dongsheng Bai,Huanwang Jing,Guangjian Wang
The synthesis of cyclic carbonates from epoxides and carbon dioxide catalyzed by cyanocobalamin and n -Bu 4 NI system was achieved under 0.8 MPa CO 2 pressure at 140°C without organic solvents. Propylene carbonate was obtained in 99% yield within 6 h under the optimized reaction conditions. The cyanocobalamin catalyst could be recycled with water and retained moderate catalytic activity. Copyright © 2012 John Wiley & Sons, Ltd.
研究领域:
化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2022
·
IF 18.027
Han Wang,Xueqi Wang,Jing Cheng
Nitrite plays a critical role in a variety of physiological processes and maintaining the nitrite level in an appropriate range is vital to keep healthy. Current nitrite analysis methods lack sensitivity and require tedious operations, which could not meet the need of point-of-care (POC) nitrite detection in precision medicine. Here we present a cyanocobalamin (VB12) bionic enzyme-assisted ion-selective amperometric biosensor based on 3D porous conductive matrix (PCM), which can facilitate rapid and accurate POC nitrite monitoring in complex biofluids. The experimental findings quantitatively demonstrate that the biosensor has a sensitivity of 64.08 μA/(mM·cm2), a wide linear range of 0.025–45 mM, and low limit of detection of 1 nM. Moreover, the developed VB12/BSA-PCM biosensor shows outstanding stability after 21 days with 2% decline in current signal, and high repeatability between batches with RSD of only 1.29%. Real salivary nitrite detection has been evaluated, and the results match well with the commercial nitrite analyzer. Thus, the bionic enzyme-assisted ion-selective amperometric biosensor proposed herein has potential utility as an affordable tool for POC detection and home-based healthcare.
研究领域:
分析化学
·
生物医学工程
·
即时诊断
·
生物传感器
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Xinyu Liu,Jianlong Wang
The efficient elimination of ammonia nitrogen (NH 4 + -N) from the specific wastewater and selective oxidation to nitrogen gas are the most desirable purposes of wastewater treatment, but still remains a challenge. Herein, we presented a cobalt-based catalyst (Co-VB 12 -C) as a novel heterogeneous catalyst, which was fabricated via the co-pyrolysis of poly (2,6-diaminopyridine) and vitamin B 12 . Co-VB 12 -C were successfully prepared to construct a facile heterogeneous Co-VB 12 -C/PMS/Cl system and achieve effective removal of NH 4 + -N and high selectivity to nitrogen gas in acidic and neutral pH. Co-VB 12 -C had superior catalytic capability, reusability, and stability. The role of catalyst, PMS, Cl - , and pH value was investigated and the corresponding mechanism was proposed, which revealed that Cl•-mediated oxidation reactions made predominant contribution to NH 4 + -N transformation. This system is a facile alternative technology for removing ammonium from high saline wastewater.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2025
·
IF 12.4
Zhongcan Peng,Wenfeng Li,Yingchao Wang,Longping Zhu,Depo Yang,Guomin Zhao,Peng Zhong,Zhimin Zhao
To explore the prebiotic potential of ‘Chachi’ pectin (CP), low-molecular-weight ‘Chachi’ pectins (LCPs) were prepared using pectinase (PP1, PP3) and Fenton (FP2, FP4) methods. Compared to CP, LCPs were enriched in rhamnogalacturonan I (RG-I) structures, exhibited lower degree of methylation, and had significantly reduced particle size and viscosity. Enzymatic hydrolysis was milder, targeting homogalacturonan (HG) regions and yielding LCPs with narrower molecular weight distribution. Fenton reaction was more intense, breaking both HG and RG-I Ara side chains, producing LCPs with broader molecular weight distribution. In vitro fermentation revealed that enzymatically modified LCPs, especially PP3, significantly enhanced total short-chain fatty acids (SCFAs) production by promoting the growth of beneficial bacteria like Bacteroides and Prevotella while inhibiting pathogens such as Klebsiella and Streptococcus . All LCPs demonstrated varying prebiotic effects, with PP3 notably influencing gut microbiota composition. These findings highlight its promise in developing prebiotics targeting gut microbiota regulation. This research provides a foundation for utilizing ‘Chachi’ peel-derived LCPs as functional dietary fibers.
研究领域:
食品科学
·
微生物学
·
营养学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Nian Xiang,Yuming Lin,Zuzeng Qin,Tongming Su,Xinling Xie,Hongbing Ji
Polysaccharides-based smart fertilizers are essential for promoting plant growth, yet significant challenges exist in achieving stable structures and synchronizing nutrient release and plant growth. This study developed a temperature-responsive gating chitosan-based microcapsule (CTSMC-g-PNIPAM) by grafting N-isopropyl acrylamide (NIPAM) onto chitosan microcapsules (CTSMC) via atom transfer radical polymerization (ATRP). The interfacial crosslinking of chitosan (CTS) and terephthalendehyde (TPA) formed the CTSMC matrix with a hollow chamber structure and ensured stability. CTSMC-g-PNIPAM exhibited reversible temperature-responsive gating properties and sustained release behavior, and the PNIPAM chains acted like gating switches. Below the low critical solution temperature (LCST) (25 °C), the PNIPAM chains stretched and the gating switch closed, slowing down the release rate. Above the LCST (40 °C), the PNIPAM chains contracted and the gating switch opened, accelerating the release rate. The release behaviors of CTSMC-g-PNIPAM in soil indicated that the gating microcapsule effectively prolonged the release of urea. Moreover, the cumulative release of CTSMC-g-PNIPAM at 40 °C was significantly higher than at 25 °C. The first-order kinetic and Korsmeyer-Peppas model indicate that the urea release involves concentration gradient diffusion and skeleton dissolution. Compared with pure urea, urea@(CTSMC-g-PNIPAM) increased the growth status of maize, suggesting a promising strategy for smart fertilizers.
研究领域:
农业科学
·
材料科学
·
植物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Junli Li,Guoqiang Xiang,Lijun He,Xiuming Jiang,Renyong Zhao
B, N-co-doped carbon dots (B, N-CDs) were prepared using hydrothermal method with 3-amino phenylboronic acid (3-APBA) as a precursor, yielding 82.5 %. The as-prepared B, N-CDs demonstrated highly stable fluorescence emission with a fluorescence quantum yield (FQY) of 51.4 % under various experimental conditions including 4 M NaCl solution, 120 days of storage, and solution temperature of 100 °C. Based on the boronate affinity between boric acid groups on the surface of B, N-CDs, and the cis -diol structure of ascorbic acid (AA), a novel fluorescence assay for AA was established with a detection limit of 41 nM. Additionally, based on the redox reaction between hydroperoxide (H 2 O 2 ) and boric acid groups on B, N-CDs, a fluorescence assay for H 2 O 2 with a detection limit of 4.5 nM was developed. The proposed fluorescent assay methods were successfully applied for the determination of AA and H 2 O 2 traces in food samples, and the spiking recoveries were in the range of 82.5 % −115.75 %.
研究领域:
分析化学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Chunyan Liu,Yanjuan Liu,Yuefei Zhang,Wei Chen,Sheng Tang
In this work, zeolitic imidazolate framework-67 (ZIF-67) with excellent stability synthesized at room temperature was used together with amphiphilic polymer hydrogel to synthesize a captivating mixed-mode silica stationary phase for the first time. The amphiphilic polymer hydrogel prepared by weakly basic cationic and acidic anionic monomers that was modified on the surface of ZIF-67@SiO 2 by a simple physical coating method not only improved the separation performance, but also enhanced the applicability of ZIF-67@SiO 2 in chromatographic analysis. Meanwhile, the porous ZIF-67 effectively alleviated the problem that polymer hydrogel was easy to swell. To sum up, the amphiphilic polymer hydrogel and ZIF-67 showed excellent synergistic effect in improving the separation ability and the applicability of stationary phase. The experimental results demonstrated that the ZIF-67/hydrogel@SiO 2 stationary phase could be applied in various chromatographic separation modes, demonstrating superior resolution and separation selectivity for polycyclic aromatic hydrocarbons, steroid hormones, nucleosides, B-vitamins, sulfonamides, benzoic acids and dinitrobenzene isomers. In this study, the synergistic expression of ZIF-67 and polymer hydrogel provided a new idea for the development of silica stationary phase co-modified by metal-organic framework and hydrogel material. Concurrently, the successful preparation of ZIF-67/hydrogel@SiO 2 composite revealed a new possibility for utilizing ZIF-67 as the functional material of stationary phase, expanding the application potential of ZIF-67 in the field of chromatography.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Aquaculture Reports
·
2024
·
IF 3.2
Kangyuan Qu,Siyuan Xiong,Caiqian Huang,Xiaoxia Jiang,Lixia Tian,Shiwei Xie
Ornithine is an arginine family amino acid and is not incorporated into protein. This study evaluated its role in growth, immune response and acute NH 3 stress tolerance of Penaeus vannamei . Six diets with graded levels (0.6, 0.9, 1.2, 1.5, 1.8, 2.1 g kg −1 ) of L-ornithine were formulated, and fed the shrimp for 8 weeks. The growth of shrimp was significantly improved with the dietary ornithine levels increased from 0.6 to 1.5 g kg −1 . Feed efficiency, protein efficiency ratio and protein productive value showed a similar trend to the growth performance of shrimp. Whole body protein and muscle lipid of shrimp were significantly increased in shrimp fed 1.8 g kg −1 ornithine compared to those fed 0.6 g kg −1 ornithine. The contents of several amino acids were increased with the dietary ornithine increased to 1.5 g kg −1 . Elevated levels of ornithine increased the Nitric Oxide (NO) content and suppressed arginase activity in the hemolymph. The relative mRNA expression of superoxide dismutase , heat shock protein 70 , dorsal and caspase 3 were increased with the dietary addition of ornithine, while the mRNA level of arginase was decreased with the increasing dietary ornithine levels. After 9 h acute NH 3 stress, mortality of shrimp reduced with the increasing dietary ornithine levels. The relative mRNA levels of superoxide dismutase , heat shock protein 70 , dorsal and catalase were increased with the dietary addition of ornithine after the acute NH 3 stress. The second-order regression analysis of weight gain and survival after acute stress revealed that the suitable ornithine content in the shrimp diet was 1.4–1.5 g kg −1 .
研究领域:
水产养殖学
·
营养学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Lei Wang,Hong Wang,Sinong Huang,Jiao Feng,Yifei Wu,Jing Deng,Junping Liu,Xiang Tu,Xiaoyan Ma,Xueyan Li,Andrea M. Dietrich
Complete dehalogenation of halogenated organic pollutants has attracted increasing attention, and electrocatalytic reduction processes are considered prospective technologies due to their high selectivity for carbon-halogen bonds. In this study, a vitamin B 12 (VB 12 ) composite electrode was prepared and applied to remove the refractory tribromoacetic acid (TBAA). The reduction process dominated by the VB 12 composite electrode showed a degradation efficiency of 55.2 % for 200 μg/L TBAA within 60 min. Interestingly, UV irradiation considerably increased the efficiency of TBAA for dehalogenation on the VB 12 composite electrode. The photoelectrochemical co-catalytic system of a VB 12 composite electrode coupled with UV (LP UV 254 nm) could remove 92.2 % of TBAA in 20 min with a rate constant 12 times higher than the VB 12 -only electrolysis system. The in situ Raman characterization and cyclic voltammetry tests confirmed that the accelerated formation of Co-Br bonds and the enhanced atomic H* mediated ability were responsible for improving debromination efficiency. The degradation of TBAA mainly underwent chemical reactions of debromination and mineralization. Acetic acid, formic acid, formaldehyde, and Br - were the major transformation products of TBAA. Acidic conditions favoured TBAA removal in the UV synergistic VB 12 electrolytic system, and excellent cycling stability of debromination was obtained in complex aqueous environments (actual bodies of water containing various inorganic and organic matter). This research provides an efficient dehalogenation technology for halogenated micropollutants and novel perspectives on the scientific design of photoelectrochemical dehalogenation processes.
研究领域:
环境科学
·
电化学工程
·
污染控制技术
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Tianjiao Liu,Deming Dong,Yingyi Meng,Haijun Chen,Chunyue Liu,Zihan Qi,Anfeng Li,Yang Ning
Due to the very important role in physiological process, a simple and sensitive hemin detection method is necessarily required. Biomass-based carbonized polymer dots (CPDs) have been widely studied especially as fluorescence probe owing to the advantages of low toxicity and the variety of fluorescence color, yet there are still challenges in developing their multi-color emission property from the same raw materials. In this work, red, white and blue emissive CPDs derived from chlorophyll have been synthesized via hydrothermal method. Then white-emitted CPDs (white-CPDs) with the Commission International d’Eclairage (CIE) coordinates at (0.34, 0.32) were used to develop a fluorescence quenched sensing system for hemin determination. There is a good linear relationship between (F 0 -F)/F 0 and concentration of hemin in the range of 0.1–0.95 μM with a detection limit of 0.043 μM, and the quenching mechanism was considered to be caused by inner filter effect (IFE). Moreover, it has been successfully used for hemin detection in serum and also for visual determination, which indicating great potential in applications of disease diagnoses and trace identification.
研究领域:
分析化学
·
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Jianming Wu,Qian Ma,Qingkai Pang,Qinjie Xu,Lihong Geng,Xiangfang Peng,Zhenming Chen,Peng Li,Yukun Chen
Given the toxicity of wastewater pollutants to both humans and the environment, it is critical to develop a new synthetic membrane with superior permeability and rejection. Herein, a novel asymmetric polyethersulfone (PES) composite filtration membrane was successfully prepared using a simple alternating vacuum-deposition process with positively charged chitosan and negatively charged cellulose nanofibrils as polycations and polyanions, respectively. As expected, the produced PES composite filtration membranes had a compressed and negatively charged surface, which prevented the anionic dye methyl blue (MB) molecules from infiltrating into the membrane matrix. Consequently, the resulting PES composite filtration membranes exhibited an extremely high MB rejection (99.7%) and a satisfactory flux (37.47 L h −1 m −2 MPa −1 ). In addition, the composite membrane demonstrated extremely selective removal of anionic dyes in the presence of neutral dyes due to the Donnan effect. Furthermore, the developed PES composite filtration membranes displayed exceptional long-term stability (99.8% rejection and 36.5 L h −1 m −2 MPa −1 flux after 50 h of filtration) and recycling properties (90.1% flux recovery rate after 3 cycles of running). In conclusion, the PES composite filtration membranes prepared in this study presented great potential in wastewater filtering.
研究领域:
环境科学
·
材料科学
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 10
·5858-5865
·
IF 10.7
Mengmeng Wang,Yunmei Du,Shuangshuang Li,Yuanxiang Gu,Lei Wang
Ru dopants enhanced electrocatalytic performance by optimizing the electronic configuration, but how to efficiently dope Ru and introduce strain effect is a challenge. In this work, Vb12 is used to introduce the CN layer into phosphides and effectively increase the doping amount of Ru. Notably, Ru dopants induce Ni2P to produce a tensile strain of 0.172%, effectively optimizing the electronic configuration of Ru-Ni2P. Obviously, Ni with more positive charges acts as the UOR active site, and the optimized Ru acts as the HER active site, synergistically promoting urea-assisted total water decomposition. Surprisingly, the Ru-Ni2P@CN catalyst only required a potential of 1.412 V to drive 1 A cm−2 for urea-assisted water splitting. With the help of Vb12, abundant Ru dopants, and tensile strain were successfully introduced into the phosphide electrode, which provided a new idea for optimizing the performance of the phosphide electrode.
研究领域:
材料科学
·
电化学
✓ 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）