Scientific Reports
·
2017
·Vol. 7
·期 1
·1-12
·
IF 4.259
Wu Zhaoguan,Li Henghui,Zhang Qiwei,Liu Xin,Zheng Qi,Li Jianjun
O -Acetylation of sialic acid in protein N-glycans is an important modification and can occur at either 4-, 7-, 8- or 9-position in various combinations. This modification is usually labile under alkaline reaction conditions. Consequently, a permethylation-based analytical method, which has been widely used in glycomics studies, is not suitable for profiling O -acetylation of sialic acids due to the harsh reaction conditions. Alternatively, methylamidation can be used for N-glycan analysis without affecting the base-labile modification of sialic acid. In this report, we applied both permethylation and methylamidation approaches to the analysis of O -acetylation in sialic acids. It has been demonstrated that methylamidation not only stabilizes sialic acids during MALDI processing but also allow for characterization of their O -acetylation pattern. In addition, LC-MS/MS experiments were carried out to distinguish between the O -acetylated glycans with potential isomeric structures. The repeatability of methylamidation was examined to evaluate the applicability of the approach to profiling of O -acetylation in sialic acids. In conclusion, the combination of methylamidation and permethylation methodology is a powerful MALDI-TOF MS-based tool for profiling O -acetylation in sialic acids applicable to screening of N-glycans.
研究领域:
生物化学
·
分析化学
·
糖组学
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DOI
PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
·
2018
·
IF 1.686
Jing Huang,Yi-Hua Wu,Zhi-Gang Zhu,Wan Y. Shih,Wei-Heng Shih
Methylammonium lead bromide (CH 3 NH 3 PbBr 3 ) nanocrystals have great potentials for lighting and display applications. Previously we synthesized CH 3 NH 3 PbBr 3 nanocrystals using oleylamine as capping molecule and found that by increasing the oleylamine to CH 3 NH 3 PbBr 3 perovskite ratio (OPR), the photoluminescence wavelengths and morphology of CH 3 NH 3 PbBr 3 nanocrystals could be varied from 530 nm (green) platelets to 460 nm (blue) particles. Here we modified the synthesis to direct injection of precursors into toluene and found that increasing OPR not only changes the wavelength and morphology of nanocrystals but also the size of the unit cells.
研究领域:
材料科学
·
光学
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DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Zuzhe Kang,Zhong Zhang,Yue Zhang,Siyu Chen,Jinyi Wang,Mao-Sen Yuan
In this study, we successfully developed a new multifunctional chemosensor 4′,4‴-(2,2-diphenylethene-1,1-diyl)bis( N , N -bis (pyridin-2-ylmethyl)-[1,1′-biphenyl]-4-amine ( T-D ), based on the cooperation of tetraphenylethylene and di-(2-picolyl)amine (DPA), for sensitive, selective, and quick detection of Cu 2+ , PO 4 3− and pesticide glyphosate in aqueous solution. In our research, we made full use of the Cu 2+ -indicator displacement strategy to achieve the construction of an “on-off-on” fluorescent switch platform. Due to the presence of the DPA moiety in T-D , Cu 2+ could be captured quickly to form the complex T-D-Cu and caused fluorescence quenching . With the addition of PO 4 3− and glyphosate, the system could rapidly restore the fluorescence by squeezing Cu 2+ from T-D-Cu and blocking the photo induced electron transfer (PET) process to display the aggregation-induced emission. To demonstrate the possibility of practical applications, we detected PO 4 3− and glyphosate in spiked real samples. The detection limit for PO 4 3− and glyphosate reached 19 nM and 25 nM, respectively. Furthermore, test strips using T-D-Cu solution simplified the detection process of glyphosate. More importantly, the sensor could be used in visual semi-quantitative determination of PO 4 3− concentrations in both living cells and living zebra fish. Therefore, the chemosensor presented here will not only be a powerful tool for the detection of phosphate anions in aqueous solution and biological systems, but also provides a new template for the design of other multifunctional chemosensors.
研究领域:
分析化学
·
环境科学
·
生物化学
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产品关联
DOI
PubMed
高影响因子
OPTIK
·
2024
·
IF 3.1
Song-Hyok Kim,Kyong-Su Sonu,Pyol Kim,Jin-Hyok Ri,Kwon-Il Ryu,Chol-Il So,Sol-Gwang An,Il-Bok Choe
Recently, hole-conductor-free perovskite solar cells (PSCs) with carbon counter electrode (CCE) have attracted great attention for its high stability and low fabrication cost. Furthermore, it would lower the cost and simplify the manufacturing process of PSCs by low temperature processing instead of high temperature sintering for fabrication. In this case, however, it is very important to improve the interfacial contact between perovskite layer and CCE. In this work, we for the first time introduce solid-gas reaction between dimethylammonium lead iodide (DMAPbI 3 ) in solid state under carbon layer and methylamine (MA) gas passed through CCE which is formed at low temperature of 120 ℃. Based on Brunauer-Emmett-Teller (BET) measurement and XRD analysis , it is found that MA gas can pass through our low-temperature CCE and perovskite crystals could be successfully formed by the reaction with DMAPbI 3 . In this case, due to the existence of liquid crystal intermediate state and volume expansion, interfacial contact would become better and the charge transfer and recombination characteristics have improved considerably. The best performance devices based on optimized MA gas treatment time exhibit higher efficiency of 12.4% than that of PSCs fabricated by conventional ways with low-temperature processed CCE (9.6%).
研究领域:
材料科学
·
能源技术
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DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Qiuju Shi,Lei Gao,Wenjian Li,Jiaxin Wang,Zhang Shi,Yixin Li,Jiangyao Chen,Yuemeng Ji,Taicheng An
Uncertain chemical mechanisms leading to brown carbon (BrC) formation affect the drivers of the radiative effects of aerosols in current climate predictions. Herein, the aqueous-phase reactions of methylglyoxal (MG) and typical reduced nitrogen species (RNSs) are systematically investigated by using combined quantum chemical calculations and laboratory experiments. Imines and diimines are identified from the mixtures of methylamine (MA) and ammonia (AM) with MG, but not from dimethylamine (DA) with the MG mixture under acidic conditions, because deprotonation of DA cationic intermediates is hindered by the amino groups occupied by two methyl groups. It leads to N-heterocycle (NHC) formation in the MG + MA (MGM) and MG + AM (MGA) reaction systems but to N-containing chain oligomer formation in the MG + DA (MGD) reaction system. Distinct product formation is attributed to electrostatic attraction and steric hindrance, which are regulated by the methyl groups of RNSs. The light absorption and adverse effects of NHCs are also strongly related to the methyl groups of RNSs. Our finding reveals that BrC formation is mainly contributed from MG reaction with RNSs with less methyl groups, which have more abundant and broad sources in the urban environments.
研究领域:
大气化学
·
环境科学
·
量子化学
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产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Meng Rong,Liangrong Yang,Chao Yang,Jiemiao Yu,Huizhou Liu
Herein, a new tetraphenyladamantane-cored triazine-based multiamine (TPADT) was designed and synthesized. Its bulky molecular volume, strong rigidity, and high amine functionality enable it easy to prop up the polymer backbone and form a high hypercrosslinking degree to obtain high microporosity. A series of highly microporous tetraphenyladamantane-based polyaminals (Ad-MALPs) were prepared through the catalyst-free copolymerization of TPADT and commercial aromatic aldehydes. By changing the strut length and functionality of aldehyde monomers , the resulting polymers exhibit tailored BET surface area (1541–1779 m 2 /g) and narrow ultramicropore size distribution (0.52–0.93 nm). Ad-MALP-2 with the largest microporosity possesses the highest CO 2 uptake (21.1 wt %, 273 K/1.0 bar) and CO 2 /N 2 adsorption selectivity (35.2). Interestingly, Ad-MALP-3 shows the highest H 2 uptake (2.26 wt%, 77 K/1.0 bar) due to larger total pore volume . In addition, highly microporous Ad-MALPs simultaneously contain aromatic and cycloaliphatic components, and thus show exceptionally large aromatic and cycloaliphatic organic vapor adsorption capacity under low pressure. At P/P 0 = 0.1, the benzene and cyclohexane vapor uptakes of Ad-MALPs are up to 44.8 wt% and 39.0 wt %, far exceeding that of most previously reported porous organic polymers . Considering that Ad-MALPs have outstanding gas adsorption performance, simple preparation, good stability, and cycle ability, they are expected to be promising adsorbent materials for CO 2 adsorption/separation, H 2 storage and low-concentration volatile organic vapors capture.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
Physica Status Solidi-Rapid Research Letters
·
2019
·Vol. 13
·期 10
·1900176
·
IF 3.729
Qi Zhang,Huizhi Sun,Heyi Zhang,Mao Jiang,Xiaodong Wu,Zhiyuan Zhang,Tongyin Yang,Ruidong Xia,Juan Cabanillas-Gonzalez
Organic–inorganic lead halide perovskites have emerged rapidly as the most attractive materials for photovoltaics in the last 10 years. Intense research has been done on crystal growth and morphology control to improve their power conversion efficiencies. Furthermore, perovskites also show great potential for optical amplification and lasing. Despite the numerous reports on how processing conditions affect the perovskite light-harvesting properties, effects on amplified spontaneous emission (ASE) or lasing performance have attracted considerably less attention. Herein, a detailed study on the ASE performance of methylammonium lead triiodide (MAPbI 3 ) films, processed with lead acetate (Pb(Ac) 2 ) as lead source following a one-step spin-coating method and exposed to different post-deposition conditions, is presented. It is found that the use of Pb(Ac) 2 instead of lead iodide (PbI 2 ) accelerates the crystal growth and simplifies the fabrication procedure. Even very thin MAPbI 3 films (≈70 nm) can sufficiently support optical amplification and lasing in surface-emitting distributed-feedback (DFB) cavities. The facile and highly controllable MAPbI 3 film formation observed with Pb(Ac) 2 as precursor makes it a preferred choice with respect to PbI 2 for future perovskite laser diodes.
研究领域:
材料科学
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光学工程
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光电子学
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DOI
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 2
·308
·
IF 4.6
Sunan Wang,Litao Chen,Lei Guo,Jiansheng Luo,Liangliang Ren,Xiong Xiang,Tie Geng,Changhong Yu,Zilong Meng
The hydrate blockage avoidance performance of two anti-agglomerants (coconut amidopropyl dimethylamine, propylene bis (octadecylamidopropyl dimethylammonium chloride)) and their mixtures with polyvinylpyrrolidone (PVP) was tested in a high-pressure rocking cell apparatus. The effect of gas–liquid ratio, water content and PVP concentration were analyzed. A method for evaluating the kinetic inhibiting and anti-agglomerating performance of hydrate inhibitors was established. It was found that coconut amidopropyl dimethylamine had good anti-agglomerating performance at a low gas–liquid ratio (0.5) and various water content levels (20~80%), while propylene bis (octadecylamidopropyl dimethylammonium chloride) had a good anti-agglomerating performance only at a low gas–liquid ratio (0.5) and high water content (80%), and the hydrate volume fraction was up to 23.27% for good anti-agglomeration. When PVP was mixed with the above two anti-agglomerants, it was found that coconut amidopropyl dimethylamine could significantly reduce the kinetic inhibition performance of PVP, while propylene bis (octadecylamidopropyl dimethylammonium chloride) had no significant effect on the kinetic inhibition performance of PVP. The maximum subcooling was 4.4 °C. PVP had no significant effect on the anti-agglomerating performance of the two anti-agglomerants, and the maximum hydrate volume fraction was 18.87% when the agglomeration was well inhibited.
研究领域:
化学工程
·
石油工程
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DOI
PubMed
高影响因子
Advanced Science
·
2022
·Vol. 9
·期 15
·2103735
·
IF 17.521
Lulu Liu,Weijun Li,Xiaopeng Feng,Chunjie Guo,Huimao Zhang,Haotong Wei,Bai Yang
Metal halide perovskite scintillators encounter unprecedented opportunities in indirect ionizing radiation detection due to their high quantum yields. However, the long scintillation lifetime of microseconds upon irradiation, known as the afterglow phenomenon, obviously limits their fast development. Here, a new type of hybrid X-ray detector wafer combining direct methylamine lead iodide (MAPbI 3 ) semiconductor and indirect zero-dimensional cesium copper iodide (Cs 3 Cu 2 I 5 ) scintillator through low-cost fast tableting processes is reported. Due to the fast energy transfer from Cs 3 Cu 2 I 5 to MAPbI 3 , the device response time to X-rays is dramatically reduced by nearly 30 times to 36.6 ns, which enables fast X-ray detection capability by a large area detector arrays within 1 s. Moreover, Cs 3 Cu 2 I 5 exists at the grain boundaries of MAPbI 3 crystals, and blocks the paths of mobile ions of perovskite, leading to the lowest detectable dose rate of hybrid X-ray detector is thus reduced by 1.5 times compared with control MAPbI 3 direct-type semiconductor, and 10 times compared with the Cs 3 Cu 2 I 5 indirect-type scintillator. The direct/indirect hybrid wafer also exhibits improved operation stability at ambient conditions without any encapsulation. This new kind of hybrid X-ray detectors provides strong competitiveness by combining the advantages of both direct perovskite semiconductors and indirect perovskite scintillators for next-generation products.
研究领域:
材料科学
·
物理学
·
辐射检测
·
半导体器件
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产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Guoliang Zhang,Cong Xue,Ruxangul Jamal,Tursun Abdiryim,Feng Xu,Qian Cheng
L-Tyrosine (L-Tyr) is one of the 21 essential amino acids for the human body. Its accurate detection is of great clinical and practical significance in monitoring, food quality and safety. Functional groups critically govern electrochemical sensor performance by mediating target adsorption. Conventional poly (3,4-ethylenedioxythiophene) (PEDOT)-based sensors face limited flexibility and active site accessibility. Amino-grafted PEDOT was developed by in situ growth on Ti 3 C 2 T X nanosheets, incorporating small-sized Au nanoparticles to create a highly conductive and active substrate for selective detection of L-Tyr. The resulting molecularly imprinted electrochemical sensor, fabricated on the PEDOT-CH 2 NH 2 /Ti 3 C 2 T X /Au NPs/GCE platform, exhibited enhanced catalytic activity and efficient L-Tyr enrichment. The combination of components improved electron transfer, MIP stability, and imprinting cavity accessibility. The sensor demonstrated a broad linear range (10 −6 –100 μM) with an ultralow detection limit (3.64 × 10 −6 μM), and exhibited excellent selectivity, reproducibility, and operational stability. Practical tests in milk matrices confirmed high recovery rates (96.65 %–101.35 %), showcasing its potential for use in complex food systems and it also has detection capabilities similar to those of standard methods. This work provides a sensitive and reliable strategy for amino acid monitoring in food, with significant applications in food safety assurance.
研究领域:
分析化学
·
食品安全
·
传感技术
·
纳米材料
·
电化学
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产品关联
DOI
高影响因子
Advanced Energy Materials
·
2020
·Vol. 10
·期 14
·2000197
·
IF 25.245
Lusheng Liang,Haitian Luo,Junjie Hu,Hui Li,Peng Gao
The presence of non-radiative recombination at the perovskite surface/interface limits the overall efficiency of perovskite solar cells (PSCs). Surface passivation has been demonstrated as an efficient strategy to suppress such recombination in Si cells. Here, 1-naphthylmethylamine iodide (NMAI) is judiciously selected to passivate the surface of the perovskite film. In contrast to the popular phenylethylammonium iodide, NMAI post-treatment primarily leaves NMAI salt on the surface of the perovskite film. The formed NMAI layer not only efficiently decreases the defect-assisted recombination for chemical passivation, but also retards the charge accumulation of energy level mis-alignment for vacuum level bending and prevents minority carrier recombination due to the charge-blocking effect. Consequently, planar PSCs with high efficiency of 21.04% and improved long-term stability (98.9% of the initial efficiency after 3240 h) are obtained. Moreover, open-circuit voltage as high as 1.20 V is achieved at the absorption threshold of 1.61 eV, which is among the highest reported values in planar PSCs. This work provides new insights into the passivation mechanisms of organic ammonium salts and suggests future guidelines for developing improved passivation layers.
研究领域:
光伏学
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材料科学
·
表面化学
·
可再生能源
·
半导体器件
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Wenli Liu,Qizhi Yang,Yili Yang,Feiyue Xing,Pu Xiao
In the past decades, polymeric fluorescent materials with aggregation-induced emission (AIE) properties play important roles in the fields of biomedical and analytical chemistry, and the synthesis of well-defined polymers under mild conditions is in demand. In this report, narrowly distributed poly(methyl methacrylate)s (PMMAs) with AIE properties were prepared in mild conditions using 4-(1,2,2-triphenylvinyl)benzyl 2-bromo-2-phenylacetate (TPE-BPA), a novel initiator with an AIE-based functional group. This approach resulted in PMMAs with a fluorescent tag at the chain end (TPE-PMMA). Specifically, a high efficiency of initiation was observed using a low amount of air-stable copper(II) bromide/tris(2-pyridylmethyl)amine (CuIIBr2/TPMA) as a photocatalyst under the irradiation of LED@405 nm. Moreover, the TPE presented in the system did not affect the polymerization kinetics of MMA and the temporal control. The dispersities of the obtained PMMAs were as low as 1.12. Interestingly, TPE-PMMA with narrow dispersity was also obtained (Mw/Mn < 1.25) in the presence of air. Regarding the fluorescent properties of TPE-PMMAs, it was observed that their AIE intensities increased with the molecular weights. Moreover, they could also be used to probe the increased viscosity of the solution, indicating their potential of synthesizing functional sensors. The approach proposed in this work is convenient to prepare poly(methacrylate)s with well-defined structures in the presence of AIE-based fluorescent tags, and it thus paves a new way for the rational design of AIE-functionalized polymeric materials.
研究领域:
高分子化学
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材料科学
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分析化学
·
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）