TALANTA
·
2021
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IF 6.057
Qianying Sheng,Junyan Li,Yingxin Chen,Xinmiao Liang,Minbo Lan
Glycosylation is one of the most important post-translational modifications of proteins, and plays an important role in the structure and function of proteins. However, due to the diversity of glycopeptide forms and their low abundance, it is extraordinarily challenging to capture and separate glycopeptides with high selectivity from complex biological samples with mass spectrometric analysis. Here, we synthesized a new type of hydrophilic composite based on electrostatic interactions , which has been proven to be effective in immobilizing cationic cellulose on graphene oxide-dopamine carriers (expressed as GO-DA-JR), for highly specific enrichment of N-glycopeptides. The introduction of cationic cellulose provides not only a perfect surface charge for the composite but also a greater ability to enrich glycosylated peptides. Thirty-two glycopeptides from human serum immunoglobulin G (IgG) tryptic digests were observed with a greatly improved signal-to-noise ratio (S/N) and also presented high performance in anti-interfering enrichment of glycopeptides from complex samples containing 100-fold bovine serum albumin tryptic digests. In addition, GO–DA-JR has higher sensitivity (1 fmol/μL IgG) and better enrichment capacity (up to 150 mg/g). Moreover, the results of glycopeptide enrichment and glycosylation analysis from human serum also show egood enrichment selectivity from real biological samples. This work exhibits high selectivity, high sensitivity, good stability and operability, indicating its potential for applications of glycopeptides enrichment in post-translational modification proteomics.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2020
·Vol. 45
·期 4
·6227-6238
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IF 3.741
Xiangxiang Du,Xuejun Shi,Yanling Li,Kesheng Cao
Summary Herein, N, S-co-doped graphene hydrogel (N/SGH) was first prepared by one-pot feasible hydrothermal approach using thiourea as a dopant for both N and S sources. And then, polyaniline (PANI) was grown on the surface of N, S-co-doped graphene hydrogel via simple adsorption of aniline monomer and in situ polymerization process. The N, S-co-doped graphene/polyaniline (N/SGH/PANI) composite hydrogel was fabricated as a free-standing and binder-free electrode material. Due to the co-doped synergistic effect, the N/SGH electrode exhibited enhanced electrochemical performances. The N/SGH electrode displays a specific capacitance of 130.4 F/g at 0.5 A/g. Compared with pure graphene hydrogel (GH), the specific capacitance of N/SGH and N-doped graphene (NGH) electrodes at 0.5 A/g increased by 53% and 20%, respectively. PANI pseudocapacitor material was introduced to further improve its capacitive performance. The resultant N/SGH/PANI composite electrode could achieve a max specific capacitance of 236.5 F/g at 0.5 A/g. In addition, N/SGH/PANI composite electrode showed stable cycle performance with the capacity retention of 95.1% after 1000 cycles performed at 10 A/g. Those provide a fabrication strategy for the design of high-performance supercapacitors electrode materials.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Yang Zhao,Di Wu,Ying Chen,Yang Li,Xiaobin Fan,Fengbao Zhang,Guoliang Zhang,Wenchao Peng
Carbon materials are effective catalysts to activate peroxymonosulfate (PMS) for organic pollutant degradation. Both nitrogen doping and structural defects could enhance their catalytic performance for PMS activation. In this study, nitrogen-doped graphene (NG) is first synthesized by the calcination of graphene oxide (GO) with ammonium nitrate (NH 4 NO 3 ). The obtained NG is then annealed further at a higher temperature under a N 2 atmosphere to remove partially doped N atoms and create new structural defects. The obtained defective nitrogen-doped graphene (D-NG) can activate PMS for bisphenol A (BPA) degradation more effectively. Different annealing temperatures from 850 to 1150 °C are investigated, and D-NG synthesized at 1050 °C exhibits the highest activity. The enhanced catalytic performance is proposed to originate from the synergistic effect between doped N atoms and created structural defects. According to radical quenching, electron paramagnetic resonance (EPR), and electrochemical results, both radical and nonradical pathways are present during PMS activation, and the nonradical pathway plays the dominant role. This study provides a facile method for metal-free catalyst synthesis, which also enriches the synergistic mechanism between doped N and structural defects and thus should have great potential in wastewater remediation.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Song He,Guanyu Chen,Huan Xiao,Guibin Shi,Chichi Ruan,Yuansheng Ma,Huaming Dai,Bihe Yuan,Xianfeng Chen,Xiaobing Yang
Activated carbons (AC) were prepared by carbonization and KOH activation using rice husk as feedstock. The effects of impregnation ratios and activation temperatures on the properties of AC were investigated. Under optimum conditions, BET surface area, total pore volume and micropore volume of AC are as high as 1495.52 m 2 /g, 0.786 cm 3 /g and 0.447 cm 3 /g, respectively. Surface modification with chitosan as nitrogen source was performed simultaneously during KOH activation process. XPS and FT-IR analyses show that N -species was successfully incorporate into AC. Compared with AC-5 (general AC), CAC-5 (modified AC) exhibits better CO 2 adsorption performance, reaching 5.83 mmol/g at 273 K and 1 bar, which can be attributed to the formation of the CO 2 -philic active sites on AC surface by N -species. The linear correlations between CO 2 uptake, micropore volume within specific size section and N -content was investigated. The isosteric heat of CO 2 adsorption for CAC-5 (average 30.21 kJ/mol) is much higher than that of AC-5 (average 14.48 kJ/mol). The adsorption behavior of CAC-5 can be well described by Freundlich model. The high IAST selectivity factor for N -doped ACs indicates their excellent adsorption selectivity for CO 2 over N 2 . Both physisorption and chemisorption are present in CO 2 adsorption process of N -doped ACs.
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EUROPEAN JOURNAL OF PHARMACEUTICAL SCIENCES
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2020
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IF 3.616
Shanshan Zhang,Sajid Asghar,Feng Yu,Ziyi Hu,Qineng Ping,Zhipeng Chen,Feng Shao,Yanyu Xiao
To solve the low oral bioavailability of curcumin (CUR) due to the limits imposed by gastrointestinal (GI) barrier, we constructed a nano delivery system to evaluate the effect of N-acetyl-L-cysteine (NAC) on intestinal absorption and oral bioavailability of CUR. CUR was first encapsulated in bovine serum albumin nanoparticles (CUR-BSA-NPs), and then was further modified by NAC (CUR-NBSA-NPs). In situ single-pass intestinal perfusion assay demonstrated that CUR-NBSA-NPs displayed excellent permeation and absorption rates in GI tract. Additionally, the distribution study in GI tract revealed that more NBSA-NPs were absorbed by intestinal segments compared to the BSA nanoparticles. Plasma concentration-time curves in rats showed that AUC 0-t , C max and MRT 0-t values of CUR after oral administration of CUR-NBSA-NPs were increased to 3.25-, 4.42-, and 1.43-fold compared with that of CUR suspension. In conclusion, NAC promotes oral absorption of CUR, thereby improving its oral bioavailability.
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SYNTHETIC METALS
·
2020
·
IF 3.286
Yucheng Yang,Siwei Yang,Guqiao Ding,Zhi Liu
Much attention has been focused on the fabrication approaches of graphene quantum dots (GQDs) with efficient, time-saving, environmentally friendly and controllable approaches, which is well relevant to further applications. In this paper, we demonstrated the self-feedback autocatalysis progress in photosynthesis of N doped GQDs (N-GQDs). N-GQDs can be obtained via the simple ultraviolet (UV) irradiation for the mixture of urea, citric acid (CA) and H 2 O 2 . No by-product was generated during the preparation process and the yield of N-GQDs is 94 wt%. Compared with GQDs obtained via previously reported methods, the highly homogeneous size of these N-GQDs (2.4–3.1 nm) demonstrated the outstanding morphological control capacity of our suggested approach. More importantly, we demonstrated the self-feedback autocatalysis progress is the key factor for the suggested efficient preparation approach. Such self-feedback autocatalysis polymerization progress under ultraviolet irradiation is a rapid and effective method to obtain N-GQDs with good morphology and optical properties . This ultraviolet excitation-induced mechanism can be a universal method for numbers of nitrogen-containing precursors.
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Molecular Catalysis
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2020
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IF 3.687
Zhen-Hong He,Yong-Chang Sun,Kuan Wang,Zhong-Yu Wang,Pan-Pan Guo,Chong-Shan Jiang,Man-Qing Yao,Zhu-Hui Li,Zhao-Tie Liu
N -heterocycles with quinoline and tetrahydroquinoline structures are highly important in pharmaceutical and chemical industries, and their highly efficient mutual transformations are vital but still challenging. In the present work, AlN supported redox cobalt catalysts (Co 3 O 4 /AlN and Co/AlN) were prepared, which could achieve the reversible aerobic oxidative dehydrogenation/hydrogenation of N -heterocycles with good performances. The catalytic performances were stem from the strong interaction between Co species with AlN support, which were confirmed by the characterizations of Raman, XPS, UV–vis DRS, and H 2 -TPR etc . Both of the catalysts showed good stabilities and reusabilities for the titled reactions. Besides, the gram-scale experiments achieved with good yields to corresponding products, revealing the present protocol possesses great potential applications in industry. The strategy of using redox Co-based catalyst not only provides a potential catalyst for the reversible hydrogenation/oxidative dehydrogenation reactions but also replenishes methods for constructing of other redox catalyst, especially with AlN as a carrier.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2020
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IF 4.551
Jian Wang,Congcong Wang,Hongchao Wang,Bo Jin,Peiping Zhang,Lina Li,Shiding Miao
The effective capture of radioactive volatile iodine ( 131 I and 129 I) from nuclear waste stream is of vital significance. In this work three kinds of porous organic frameworks (POFs) knitting with N -containing building units were constructed via cost-effective and maneuverable Scholl reaction. The obtained PAFs exhibited moderate porosity and satisfying thermal stability. With coexistence of open porous structure, the electron-rich amino group featured with π-π interactions was found to improve the affinity to iodine, and the iodine uptake capacities were 408 wt%, 335 wt% and 268 wt% when the prepared POFs of P-DPDA, P-TPB and P-PC were employed for the adsorption experiments. The results were superior to most of the porous adsorbents including zeolite , metal-organic frameworks (MOFs) and porous organic polymers (POPs). Iodine adsorption capacities of 289.50 mg g −1 (for P-DPDA), 194.63 mg g −1 (for P-TPB) and 259.69 mg g −1 (for P-PC) in organic solution were achieved, and the adsorbed iodine molecules could be released to ethanol. Such promising and cost-effective materials can be envisaged for application in the field of nuclear waste management.
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ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Zhiyan He,Guangxing Yang,Hongjuan Wang,Fengying Dai,Feng Peng,Hao Yu
Metal- and nitrogen-doped carbon materials (Me–N–C) have received intensive scientific interest as single-atom catalysts (SACs) for electro- and thermocatalytic reactions. In this work, the potential of Me–N–C (Me = Co, Fe, Ni)-wrapped carbon nanotubes (CNTs) as support of platinum nanoparticles (Pt NPs) for base-free oxidation of glycerol was investigated. Co-doping of transition metal and nitrogen significantly enhanced the dispersion of Pt, indicating the advantages of the supporting material for noble-metal catalysts. Two-fold improvement of turnover of glycerol was observed over 5Pt/CoNC@CNT compared to 5Pt/CNT under the same reaction conditions. A kinetics study was conducted to understand the role of CoNC as a support of Pt NPs in a wide range of oxygen partial pressure from 0.04 to 0.4 MPa and a range of glycerol concentration from 0.012 to 0.15 wt %. A synergistic effect between Me–N–C, especially Co–N–C, and Pt NPs was revealed. The Co–N–C support facilitated the activation of oxygen and thus enhanced the overall turnover of glycerol oxidation, especially at high glycerol concentrations. This finding suggests a new approach to the high-performance Pt catalysts via introducing SACs as supporting materials that afford auxiliary active sites for the target reaction.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Nai-Xian Feng,Yu-Xi Feng,Qi-Feng Liang,Xin Chen,Lei Xiang,Hai-Ming Zhao,Bai-Lin Liu,Gang Cao,Yan-Wen Li,Hui Li,Quan-Ying Cai,Ce-Hui Mo,Ming Hung Wong
Phthalate acid esters (PAEs) are environmentally ubiquitous and have aroused a worldwide concern due to their threats to environment and human health. Di-n-butyl phthalate (DBP) is one of the most frequently observed PAEs in the environment. In this study, a novel bacterium identified as Pseudomonas sp. YJB6 that isolated from PAEs-contaminated soil was determined to have strong DBP-degrading activity. A complete degradation of DBP in 200 mg/L was achieved within 3 days when YJB6 was cultivated at 31.4 °C with an initial inoculation size of 0.6 (OD600) in basic mineral salts liquid medium (MSM), pH 7.6. The degradation curves of DBP (50–2000 mg/L) fitted well the first-order kinetics model, with a half-life ( t 1/2 ) ranging from 0.86 to 1.88 d. The main degradation intermediates were identified as butyl-ethyl phthalate (BEP), mono-butyl phthalate (MBP), phthalic acid (PA) and benzoic acid (BA), indicating a new complex and complete biodegradation pathway presented by YJB6. DBP might be metabolized through de-esterification, β-oxidation, and hydrolysis, followed by entering the Krebs cycle of YJB6 as a final step. Strain YJB6 was successfully immobilized with sodium alginate (SA), polyvinyl alcohol (PVA), and SA-PVA. The immobilization significantly improved the stability and adaptability of the cells thus resulting in high volumetric DBP-degrading rates compared to that of the freely suspended cells. In addition, these immobilized cells can be reused for many cycles with well conserved in DBP-degrading activity. The ideal DBP degrading ability of the free and immobilized YJB6 cells suggests that strain YJB6, especially the SA-PVA+ YJB6 promises great potential to remove hazardous PAEs.
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高影响因子
CATALYSIS COMMUNICATIONS
·
2020
·
IF 3.612
Pengbo Wang,Qian He,Hao Zhang,Qingdi Sun,Yujie Cheng,Tao Gan,Xiaohui He,Hongbing Ji
Several research studies have been conducted on N -formylation of amines using phenylsilane and CO 2 . However, most of these studies involved tedious processes of catalyst preparation or complex procedures. In the present study, we describe the use of a simple and commercially available ZnO catalyst for selective N -formylation of amines under mild condition. High-yielding N -formylation products with good recyclability and wide substrate scope were obtained, which can promote fine chemical synthesis and CO 2 capture.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yi Ding,Lixin Dai,Rui Wang,Haixiao Wang,Hengbin Zhang,Wei Jiang,Jun Tang,Shuang-Quan Zang
Optimizing the performance of electrode materials is crucial for improving the energy density of aqueous supercapacitors. Herein, a novel strategy inspired by biomimetic mineralization is developed to acquire a hierarchical flower-like Mn 3 O 4 @N, P-doped carbon (NPC) composite, which consists of multi-intercalated Mn 3 O 4 nanosheets and NPC cores. The Mn 3 O 4 nanosheets offer abundant active regions, and their C-O-Mn bonds with NPC ensure the fast electron transfer kinetics. It is noteworthy that the intercalation pseudocapacitance mechanism of Mn 3+ /Mn 4+ transformation in Mn 3 O 4 @NPC not only extends the potential window to 0–1.3 V (vs Ag/AgCl) but also significantly increased pseudocapacitance. Benefits from the advantages of structure and energy storage mechanism, the Mn 3 O 4 @NPC electrode delivers a high specific capacitance of 370.8 F g −1 and superior rate performance. A 2.6 V flexible aqueous asymmetric supercapacitor (FAAS) is fabricated by integrating Mn 3 O 4 @NPC cathode with an electrochemically reduced porous carbon anode and a PVA-Na 2 SO 4 hydrogel electrolyte. Notably, the FAAS delivers a high energy density of 76.96 Wh kg −1 as well as excellent rate capability. The device exhibited an excellent stability during 10,000 cycles and additional 240 h floating test. The strategy will pave the way for the development of electrode materials for FAASs.
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