FOOD CHEMISTRY
·
2024
·
IF 8.5
Jinshun Ye,Xiaotong Li,Zhenzhao Weng,Yuting Li,Xiaozhen Liu,Xiangying Yu,Fengyuan Liu,Jingkun Yan,Lin Li
This study examined the effect of quinone concentration on covalent interaction between β-lactoglobulin (β-Lg) and 4-methylbenzoquinone (4MBQ). β-Lg-4MBQ-0.2, β-Lg-4MBQ-0.4, and β-Lg-4MBQ-0.8 were prepared at 1:2, 1:1, and 2:1 M ratio of 4MBQ to β-Lg thiols, respectively. β-Lg-4MBQ-0.8 had the highest polyphenol content (19.04 ± 0.17 mg/g) and the lowest free sulfhydryl (17.12 ± 0.18 μmol/g) and amino group (181.28 ± 5.37 μmol/g) contents. Compared to β-Lg, β-Lg-4MBQ conjugates showed reduced α-helix (0.82–1.26 %) and increased β-sheet (1.17–1.50 %) content. β-Lg-4MBQ-0.8 and β-Lg-4MBQ-0.4 exhibited higher surface hydrophobicity and emulsifying properties than β-Lg-4MBQ-0.2 and β-Lg. Antioxidant activity (DPPH and ABTS scavenging) followed: β-Lg-4MBQ-0.8 (46.75 ± 0.17 % and 50.97 ± 0.51 %) > β-Lg-4MBQ-0.4 (39.50 ± 0.27 % and 46.63 ± 0.59 %) > β-Lg-4MBQ-0.2 (33.35 ± 0.71 % and 43.00 ± 0.39 %) > β-Lg (31.50 ± 0.56 % and 36.25 ± 0.90 %). β-Carotene emulsions stabilized by β-Lg-4MBQ-0.4 exhibited the highest stability. These findings provide insights into developing antioxidant emulsifiers.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Juan Qiao,Zhenyu Zhao,Zhengwei Zhou,Deli Wu
Palladized iron (Pd/Fe) represents one of the most common modification strategies for nanoscale zero-valent iron (nZVI). Most studies prepared Pd/Fe by reducing iron salts and depositing Pd species on the surface of pre-synthesized nZVI, which can be called the two-step method. In this study, we proposed a one-step method to obtain Pd/Fe by the concurrent formation of Fe 0 and Pd 0 and investigated the effects of these two methods on 4-chlorophenol (4-CP) removal, with carboxymethylcellulose (CMC) coated as a surface modifier. Results indicated that the one-step method, not only streamlined the synthesis process, but also Pd/Fe-CMC one-step , synthesized by it, exhibited a higher 4-CP removal rate (97.9%) compared to the two-step method material Pd/Fe-CMC two-step (82.4%). Electrochemical analyses revealed that the enhanced activity of Pd/Fe-CMC one-step was attributed to its higher electron transfer efficiency and more available reactive species, active adsorbed hydrogen species (H ads *). Detection of intermediate products demonstrated that, under the influence of Pd/Fe-CMC one-step , the main route of 4-CP was through hydrodechlorination (HDC) to form phenol and H* was the main active specie, supported by EPR tests, quenching experiments and product analysis. Additionally, the effects of initial 4-CP concentration, initial pH, O 2 concentration, anions such as Cl − , SO 4 2− , HCO 3 − , and humic acid (HA) were also investigated. In conclusion, the results of this study suggest that Pd/Fe-CMC one-step , synthesized through the one-step method, is a convenient and efficient nZVI-modifying material suitable for the HDC of chlorinated organic compounds.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Solar RRL
·
2021
·Vol. 5
·期 7
·2100181
·
IF 8.582
Yali Sun,Pengfei Qiu,Siyu Wang,Hongling Guo,Rutao Meng,Xiaowei Zhou,Li Wu,Wei Yu,Jianping Ao,Yi Zhang
Cu 2 ZnSn(S,Se) 4 are emerging as promising photovoltaic materials due to their outstanding photoelectrical performances, benign grain boundaries, and Earth-abundant constituent elements. However, there are largely distributed cation-disordering defects and defect clusters, which lead to an increase in recombination and a large open-circuit voltage deficit and thus deteriorate device performance. Herein, defect control for a high-efficiency Cu 2 ZnSn(S,Se) 4 solar cell by atomic layer deposition of aluminum oxide (ALD-Al 2 O 3 ) on the precursor film is reporter. Cu Zn defects and Sn-related deep defects are largely suppressed because of the decrease in Sn 2+ and the increase in Sn 4+ in the film by ALD-Al 2 O 3 on the precursor are found, and the crystallinity of absorber layer is improved from a double-layer structure to a completely single-layer structure. Furthermore, the carrier lifetime and recombination in the bulk and interface are significantly improved for devices with ultrathin Al 2 O 3 . Using this approach, the conversion efficiency increases from 8.8% to 11.0% and the open-circuit voltage deficit decreases from 0.621 to 0.577 V. Herein, a deep understanding of the relationship between Al 2 O 3 incorporation and high-efficiency Cu 2 ZnSn(S,Se) 4 devices and a new direction for controlling defects to further improve the performance of kesterite solar cells are provided.
研究领域:
材料科学
·
太阳能电池研究
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-8
·
IF 2.584
Yan Xinyu,Wang Kan,Lu Wenting,Qin Weijian,Cui Daxiang,He Jinghua
Carbohydrate antigen 72-4 (CA72-4) is an important biomarker associated closely with diagnosis and prognosis of early gastric cancer. How to realize quick, sensitive, specific, and quantitative detection of CA72-4 in clinical specimens has become a great requirement. Herein, we reported a CdSe/ZnS quantum dot-labeled lateral flow test strip combined with a charge-coupled device (CCD)-based reader was developed for rapid, sensitive, and quantitative detection of CA72-4. Two mouse monoclonal antibodies (mAbs) against CA72-4 were employed. One of them was coated as a test line, while another mAb was labeled with quantum dots and coated onto conjugate pad. The goat anti-mouse IgG was immobilized as a control line. After sample was added, a sandwich structure was formed with CA72-4 and these two mAbs. The fluorescent signal from quantum dots (QD)-labeled mAb in sandwich structure was related to the amount of detected CA72-4. A CCD-based reader was used to realize quantitative detection of CA72-4. Results showed that developed QD-labeled lateral flow strips to detect CA72-4 biomarker with the sensitivity of 2 IU/mL and 10 min detection time. One hundred sera samples from clinical patients with gastric cancer and healthy people were used to confirm specificity of this strip method; results showed that established strip method own 100 % reproducibility and 100 % specificity compared with Roche electrochemiluminescence assay results. In conclusion, CdSe/ZnS quantum dot-labeled lateral flow strips for detection of CA72-4 could realize rapid, sensitive, and specific detection of clinical samples and could own great potential in clinical translation in near future.
研究领域:
医学诊断
·
生物化学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
PROCEEDINGS OF THE COMBUSTION INSTITUTE
·
2024
·
IF 5.3
Wen-luan Xie,Bin Hu,Xiao Yang,Ji Liu,Zhi-mo Fang,Kai Li,Yang-wen Wu,Bing Zhang,Qiang Lu
Phosphoric acid is an effective and widely used catalyst for biomass pyrolysis, with significant catalytic impact on the pyrolytic reactions and product distribution. However, its fundamental catalytic mechanism in lignin pyrolysis remains unclear. In this work, we proposed and investigated three possible H 3 PO 4 -assisted pyrolysis mechanisms, i.e., hydrogen-bond-induced decomposition, phosphoric-acid-assisted hydrogen transfer (H 3 PO 4 -AHT), and phosphorolysis, and carefully discussed them through theoretical calculations, electronic structure analyses, catalytic pyrolysis experiments using the β -O-4 linked lignin model. The results indicated that the H 3 PO 4 -AHT mechanism played a dominant role in lignin catalytic pyrolysis, superior to the other two mechanisms. The phosphoric acid molecule could take advantage of its unsaturated P = O and saturated P −OH groups for hydrogen donation and acceptance in concerted H 3 PO 4 -AHT reactions. Alternatively, it could also participate in concerted intermolecular hydrogen transfer with the active hydroxyl group as a mediator. The C β −O bond cleavage could be significantly enhanced by effectively reducing the tension of the transition state ring, leading to the generation of more phenol and styrene in pyrolysis experiments. Due to the inhibition of hydrogen abstraction, C α −C β breakage of β -O-4 linkage, side chain removal of primary products, etc., the formation of other products in phosphoric acid catalytic pyrolysis of β -O-4 linked lignin was restrained. This H 3 PO 4 -AHT catalytic mechanism was also confirmed to be conductive to tautomerism, elimination, dehydration, α -O-4 linkage fracture, β -1 linkage fracture, and other important decomposition reactions in lignin pyrolysis. The understanding of these mechanisms provides valuable insights into the role of phosphoric acid in lignin pyrolysis and may guide the development of effective biomass catalytic conversion methods.
研究领域:
化学工程
·
生物质能
·
催化科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 28
·14155-14159
·
IF 5.968
Yonghua Zhou,Xingyun Li,Xiulian Pan,Xinhe Bao
Carbon has been widely used as a catalyst support and adsorbent in industry. However, it suffers from poor stability due to its limited mechanical strength, particularly under high pressures and temperatures. We report here a carbide derived carbon (CDC) layer on a porous SiC surface, which has the properties of high mechanical strength and is easy to shape. The CDC exhibits an amorphous structure and contains mainly mesopores with a BET surface area of 125 m2 g−1. The CDC–SiC composite yields a comparable performance to coconut activated carbon (AC) as a catalyst support in the probe reaction hydrogenation of 4-carboxybenzaldehyde. The further introduction of TiO2 nanoparticles enhances the activity and stability significantly because of the improved dispersion of Pd particles on CDC–SiC. The activity is 4 times higher than the Pd/AC catalyst. Pd–TiO2/CDC–SiC shows great promise as an alternative to the current AC supported Pd catalyst for the crude terephthalic acid hydropurification industry.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
SOLAR ENERGY
·
2021
·
IF 5.742
Yulin Liu,Bin Xu,Xiaoshuang Lu,Xiatong Qin,Pingxiong Yang,Junhao Chu,Ye Chen,Lin Sun
Excellent crystallinity and uniform composition distribution of the Cu 2 ZnSn(S,Se) 4 (CZTSSe) absorber are indispensable factors for the fabrication of photovoltaic device with excellent performance. Here, a facile and effective method is developed to improve the composition uniformity of CZTSSe absorber. It is inspiring that by replacing the acetates with chlorides as the solutes in the precursor solution , the issue of the composition non-uniformity especially for the distribution of Cu and Sn, which is ascribed to the rich-carbon in the acetate-based CZTSSe absorber, is able to be avoided. Due to less organic residues and composition uniformity, the grain size and the crystallinity of absorber could be significantly enhanced, and the photovoltaic performance of chloride-based CZTSSe solar cell is improved remarkably. Furthermore, substituting CuCl 2 with CuCl as the copper source in the precursor solution is able to obtain a stable solution, and the quality of CZTSSe absorber is further improved. As a consequence, 8.48% efficient CZTSSe solar cell has been yield.
研究领域:
材料科学
·
太阳能电池
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 7
·2197-2203
·
IF 4.831
Hao Tongfan,Wei Xiao,Nie Yijing,Xu Yeqing,Yan Yongsheng,Zhou Zhiping
We on report an eco-friendly molecularly imprinted material based on carbon dots (C-dots) via a facile and efficient sol–gel polymerization for selective fluorescence detection of 4-nitrophenol (4-NP). The amino-modified C-dots were firstly synthesized by a hydrothermal process using citric acid as the carbon source and poly(ethyleneimine) as the surface modifier, and then after a sol–gel molecular imprinting process, the molecularly imprinted fluorescence material was obtained. The material (MIP-C-dots) showed strong fluorescence from C-dots and high selectivity due to the presence of a molecular imprint. After the detection conditions were optimized, the relative fluorescence intensity (F 0 /F) of MIP-C-dots presented a good linearity with 4-NP concentrations in the linear range of 0.2 − 50 μ mol L -1 with a detection limit (3σ/k) of 0.06 μmol L -1 . In addition, the correlation coefficient was 0.9978 and the imprinting factor was 2.76. The method was applicable to the determination of trace 4-NP in Yangtze River water samples and good recoveries from 92.6–107.3 % were obtained. The present study provides a general strategy to fabricate materials based on C-dots with good fluorescence property for selective fluorescence detection of organic pollutants.
An eco-friendly molecularly imprinted fluorescence sensor based on carbon dots (C-dots) (poly(ethyleneimine) (PEI) as the surface modifier) was prepared via a facile and efficient sol–gel polymerization (3-aminopropyltriethoxysilane (APTES) as the functional monomer and tetramethoxysilane (TEOS) as the cross linker) for selective fluorescence detection of 4-nitrophenol (4-NP).
研究领域:
环境科学
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2013
·
IF 4.387
Hongbo Li,Jing Li,Qin Xu,Zhanjun Yang,Xiaoya Hu
A novel visible light sensitized photoelectrochemical sensing platform was constructed based on the perylene-3,4,9,10-tetracarboxylic acid/titanium dioxide (PTCA/TiO 2 ) heterojunction as the photoelectric beacon. PTCA was synthesized via facile steps of hydrolysis and neutralization reaction, and then the PTCA/TiO 2 heterojunction was easily prepared by coating PTCA on nano-TiO 2 surface. The resulting photoelectric beacon was characterized by transmission electron microscope, scanning electron microscopy, X-ray diffractometry, FTIR spectroscopy, and ultraviolet and visible spectrophotometer. Using parathion-methyl as a model, after a simple hydrolyzation process, p-nitrophenol as the hydrolysate of parathion-methyl could be obtained, the fabricated derivative photoelectrochemical sensor showed good performances with a rapid response, instrument simple and portable, low detection limit (0.08 nmol L −1 ) at a signal-to-noise ratio of 3, and good selectivity against other pesticides and possible interferences. It had been successfully applied to the detection of parathion-methyl in green vegetables and the results agreed well with that by GC–MS. This strategy not only extends the application of PTCA, but also presents a simple, economic and novel methodology for photoelectrochemical sensing.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 5
·1699-1704
·
IF 4.831
Chen Donghua,Peng Rulin,Zhou Hong,Liu Hui
Graphene oxide quantum dots (GOQD) are capable of enhancing the green chemiluminescence (CL) of the system composed of bis (2,4,6-trichlorophenyl) oxalate, hydrogen peroxide and fluorescein (TCPO/H 2 O 2 /fluorescein). It was found that 4-nitrophenol (4-NP) causes a further enhancement of the system, and this was exploited to develop a CL detection scheme for 4-NP. The optimum reaction concentrations were established, and under these conditions the calibration plot is linear in the 1.0 to 300 pmol L −1 concentration range, with a 0.3 pmol L −1 detection limit (at 3σ).We assume that CL enhancement is due to energy transfer from GOQD to fluorescein which is promoted by the interaction of 4-NP with the GOQD. The method was applied to the determination of 4-NP in spiked tap water and river water and gave recoveries between 93.4 and 107.9 %, with relative standard deviations of <4.0 %.
Graphene oxide quantum dots (GOQD) are good enhancer of Bis(2,4,6-trichlorophenyl) oxalate (TCPO) and hydrogen peroxide chemiluminescence (CL) system. The CL emission of fluorescein can be further enhanced by GOQD and this provides an extremely sensitive detection platform for 4-nitrophenol (4-NP).
研究领域:
分析化学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2025
·
IF 6
Xinliang Liu,Kuan Cai,Ziyi Zhong,Jiulong Sha,Xingxiang Ji,Parikshit Gogoi,Hainong Song,Shuangfei Wang,Jinge Guo
The peroxydisulfate (PDS)-based advanced oxidation process (AOP) has attracted great attention as an effective technique for oxidatively decomposing organic pollutants. g-C 3 N 4 , an excellent photocatalyst, has been studied to activate PDS, but the rapid photogenerated electron-hole recombination severely impedes its photocatalytic performance. Herein, highly efficient point-defect engineering by doping atoms as well as vacancies was adopted to modulate photoinduced exciton dissociation kinetics. We successfully synthesized C-doped carbon nitride (xC-g-C 3 N 4 ) by a one-step copyrolysis method using glucose and melamine as raw materials. C-doped carbon nitride can act as an electron bridge for electron transfer, leading to xC-g-C 3 N 4 with a wider light absorption range (from 475 nm to 527 nm), narrower band gap (from 2.76 eV to 2.66 eV) and higher charge separation efficiency (from 3.79 μA/cm 2 to 3.22 μA/cm 2 ). The enhanced visible light absorption performance and the reduced electron-hole pair recombination rate of xC-g-C 3 N 4 can efficiently initiate PDS. The obtained xC-g-C 3 N 4 catalyst exhibited superior photocatalytic activation performance of PDS for 4-CP degradation under visible light illumination. The degradation rate of 4-CP reached 88.3 %, with a total organic carbon (TOC) removal rate of approximately 87.9 %, which increased by 67.9 % and 160 %, respectively. This study highlights a new effective method of carbon doping in g-C 3 N 4 for activating PDS in the degradation of 4-CP.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Progress in Natural Science-Materials International
·
2025
·
IF 7.1
Jie Li,Zhangyue Zheng,Yuehong Huang,Liu He,Hongying Guo,Chunzheng Wu,Wei Liu,Weiwei Huan
The serious problems caused by water contamination call for efficient treatment. The catalytic reduction of 4-nitrophenol (4-NP) by NaBH 4 in solution is a convenient way to convert 4-NP to 4-aminophenol (4-AP), which is a precious intermediate for manufacturing of important materials such as pharmaceuticals. In the present study, the Co modified MoS 2 supported Au nanoparticles (Au/Co-MoS 2 ) is proved to be an efficient catalyst for the reduction of 4-NP. With the introduction of cobalt, the catalytic activity is improved obviously compared to Au/MoS 2 . When Co:Mo is 2:8 (mol), the Au/CoMoS 2 (2/8) catalyst exhibits the highest activity. The kinetics of the catalytic reactions were studied by the plot of ln(C t /C 0 ) against reaction time and the k app for Au/CoMoS 2 (2/8) is 1.063 min −1 . The characterization of the catalysts shows that the addition of cobalt can create more crystal defects, promote the exposure of active edge sites, facilitate the surface of catalysts to be more reactive.
研究领域:
环境科学
·
材料科学
·
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）