RAPID COMMUNICATIONS IN MASS SPECTROMETRY
·
2022
·Vol. 36
·期 17
·e9342
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IF 2.586
Wenya Shao,Ying Sun,Hang Su,Qianqian Sun,Zian Lin
Rationale Cesium ions (Cs + ) and strontium ions (Sr 2+ ), which enter the human body mainly through drinking water, are an important determinant of health. They are widely distributed on Earth and extremely soluble in water. In order to assist assessment of the drinking safety, it was essential to develop a rapid analytical method for quantification. We have established a 4-mercaptobenzoic acid (MBA)-based matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) method for the rapid detection and sensitive quantification of Cs + and Sr 2+ in the aqueous environment. Methods Using MBA as the matrix, the rapid detection and quantification for Cs + and Sr 2+ were conducted by MALDI-TOF-MS. At first, the concentration of MBA was optimized. Then, salt tolerance, detection limit and reproducibility of this method were evaluated by standard solutions. Finally, the calibration curves were constructed and applied to the rapid determination of Cs + and Sr 2+ in six commercially available bottled waters for drinking. Results For the MBA-assisted MALDI-TOF-MS method, the optimal concentration of MBA was 2 mg/mL. The signal-to-noise (S/N) ratio of Cs + was up to 971 in 1000 mmol/mL NaCl solution. The detection limits of the method for Cs + and Sr 2+ were 3 pg/mL and 10 pg/mL, respectively. Furthermore, this developed method was applied to the rapid analysis of Cs + and Sr 2+ in six commercially available drinking waters, and the results correlated well with the results obtained from a validated inductively coupled plasma mass spectrometry (ICP-MS) method. Conclusions The MBA-assisted MALDI-TOF-MS method has high sensitivity, fast detection speed, less background interference, and high reproducibility in the analysis of Cs + and Sr 2+ . Because of the physiological functions and general toxic effects, detection of Cs + and Sr 2+ in water is of major importance for drinking safety.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Tengda Zhang,Bo Ouyang,Xiuling Zhang,Guangqing Xia,Nantao Wang,Haoyu Ou,Long Ma,Pengxin Mao,Kostya (Ken) Ostrikov,Lanbo Di,Xin Tu
Effective catalytic removal of 4-nitrophenol (4-NP) in industrial wastewater remains a significant challenge due to the lack of highly efficient and stable catalysts. Herein, we demonstrated a promising plasma method for the facile, ultra-fast and low-temperature synthesis of graphite oxide (GO)-supported palladium catalyst (Pd/GO-P) rich in oxygen-containing groups (OCGs) and defects with smaller Pd nanoparticles (NPs) for highly efficient 4-NP reduction. The plasma method limited the damage to the OCGs and retained more OCGs (mainly alkoxy and hydroxyl groups) on the GO surface. In addition, plasma treatment can increase the active sites and the density of GO surface defects. These OCGs and defects promoted the 4-NP adsorption and improved the catalyst dispersion in the aqueous solution of 4-NP, thereby enhancing the catalytic reduction performance. The Pd/GO-P catalyst showed the highest reduction of 4-NP reported thus far, with a concentration-normalized rate constant of 5576 min −1 g −1 L. This value was 51.6 and 20.5 times greater than that using Pd/rGO-H prepared by a traditional thermal reduction method and a commercial Pd/AC catalyst, respectively. This work opens the avenue of exploring the use of plasma for the rational design of supported Pd catalysts with superior performance for the reduction and recycling of 4-NP in wastewater.
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Hongwei Jiang,Lei Zhou,Yuefang Sun,Kaibo Yu,Wenzhi Yu,Yuqing Tian,Junping Liu,Liqiang Zou,Wei Liu
It is still unclear how pH affects the inhibitory effects of phenolic acids and flavonoids on polyphenol oxidase (PPO). In this study, 4-hydroxycinnamic acid and naringenin were selected to investigate their interactions with PPO from pH 6.8 to 5.0. Results showed that acidic pH could enhance the inhibitory effect of inhibitors and a greater enhancement effect was observed in 4-hydroxycinnamic acid. Fluorescence emission spectra indicated that 4-hydroxycinnamic acid and naringenin interacted with PPO and quenched its intrinsic fluorescence, which was also enhanced by acidic pH. Circular dichroism suggested that 4-hydroxycinnamic acid and naringenin could reversibly bind to PPO molecules and transform α-helix into β-sheet. Molecular docking results revealed that 4-hydroxycinnamic acid and naringenin interacted with PPO through hydrogen bond and hydrophobic interaction, and more interactions were observed near the carboxyl group. These results indicated that acidic pH could significantly enhance the inhibitory effect of phenolic acid on PPO.
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Surfaces and Interfaces
·
2022
·
IF 6.137
Iltaf Khan,Aihua Yuan,Aftab Khan,Shoaib Khan,Sohail Khan,Sayyar Ali Shah,Waleed Yaseen,Yanjuan Cui,Xiaoping Shen,Xuyu Wang
In this novel research work, Cr 3+ incorporated and TiO 2 -modified porous SmFeO 3 -based nanocomposites are prepared via utilizing carbon nanosphere (CNS) as a hard template. Our experimental results proved that the introduction of porosity by employing a sequential template approach (STA) has upgraded the performances of SmFeO 3 nanoparticles. Remarkably, the incorporation of Cr 3+ increased the light absorption capability by generating surface states and regulating band gap positions, whereas the fabrication of TiO 2 enlarged surface area and enhanced charge separation by modulating high-level energy electrons (HLEEs). According to our experimental techniques, including TEM, HRTEM, SEM, TGA, BET, PEC, FS, and PL, it is demonstrated that most optimal 6Cr-PSFO and 4TiO 2 /6Cr-PSFO nanocomposites have high porosity, appropriate bandgap positions, large surface area, and show superior visible-light photocatalytic activities compared to pristine SmFeO 3 nanoparticles. Compared to pristine SFO, the activities of most active 4TiO 2 /6Cr-PSFO nanocomposites are improved by 8-fold for CO 2 conversion and 3-times for 4-chlorophenol (4-CP) degradation. The radical trapping experiment confirmed that the · OH i are the most active species and has a vital role in the photocatalytic degradation of 4-CP. Moreover, our experimental results are verified and consistent with theoretical calculations and computational studies. Finally, our research work will open up a new gateway for the designing of novel porous SmFeO 3 -based nanocomposites and their use in CO 2 conversion and pollutant removal.
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TALANTA
·
2021
·
IF 6.057
Jinying Liu,Jiabao Zhang,Yue Zhang,Yan Wang,Mengke Wang,Ziwen Li,Guannan Wang,Xingguang Su
In this paper, we proposed a dual-signal fluorometric and colorimetric system based on silicon quantum dots (SiQDs) and 4-nitrophenol (4-NP) for pH and urease sensing. SiQDs with fluorescence emission of 460 nm were prepared via aqueous-phase synthesis. As the pH of the system gradually increased, the absorption band of 4-NP at 400 nm increased and a color reaction from colorless to yellow occurred. The absorption of 4-NP overlapped quiet well with the fluorescence excitation spectrum of SiQDs, which can effectively quench the fluorescence of SiQDs. Therefore, the change of fluorescence and absorption intensities could be used to quantify pH value. The fluorometric and colorimetric pH-sensing systems both exhibited a linear respond to pH ranging from 6.0 to 7.8 with an interval of 0.2 pH unit. Urease could specifically hydrolyze urea to generate carbon dioxide and ammonia, causing an obvious increase of the pH value. Thus, urease could also be detected quantitatively by the above dual-signal pH sensing system. The linear ranges of the fluorometric and colorimetric methods for urease detection were both 2–40 U L-1. The limits of detection were 1.67 and 1.07 U L-1, respectively. More importantly, this established dual-signal system has been successfully exploited in the detection of urease in real samples with satisfactory recoveries. Compared with other traditional single-signal assay strategies, the results obtained by dual-signal methods are more accurate and reliable.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2021
·Vol. 37
·期 6
·1296-1300
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IF 1.307
Rong Xin,Lu Xiuli,Lu Tongbu
T he fabrication of highly active and easily recyclable Pd-based catalyst is meaningful for their practical application. Herein, a Pd-based dip-catalyst(Pd@Pyr-GDY) is fabricated on graphdiyne(Pyr-GDY) grown on copper foam, and applied in the reduction of nitroarenes. Specially, the as-formed Pd@Pyr-GDY shows good catalytic performance toward the reduction of 4-nitrophenol(4-NP) to 4-aminophenol(4-AP) by NaBH 4 with a rate constant k value of 3.84 min −1 , which is 12-fold higher than that of the commercial Pd/C. More importantly, Pd@Pyr-GDY could be easily and rapidly recovery from the reaction medium and no distinct inactivation was found after six cycles of the reaction. This work presents an easy way to design an efficient and easily recyclable Pd-based catalyst for practical use.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 7
·9005-9017
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IF 2.478
Mathivanan D.,Mohan A.,Yang Yaling
Nowadays, dopamine (DA) receives huge attention because it plays an importance role in chemical transmitter for peripheral and central nervous systems. 4-Nitrophenol (4-NP) is one of the common hazardous waste, because it can cause various serious diseases to humans and environment. Herein, a simple and highly efficient technique for the detection DA and 4-NP using nitrogen–ferric-doped carbon dots (N/Fe-CDs) was reported in this article. The N/Fe-CDs were prepared using microwave digestion technique with a high quantum yield of 49.52%. The N/Fe-CDs exhibited excellence selectivity toward the detection of DA and 4-NP. Based on the quenched fluorescence between N/Fe-CDs and DA and 4-NP to detect DA and 4-NP, the linear range of DA was 0.5 - 300 µM with a detection limit of 0.07 µM (S/N =3), while the linear range of 4-NP was 0.1 - 250 µM with a detection limit of 0.02μM. Additionally, the anticipated sensing technique has been successfully applied for real sample analysis such as human serum and urine samples for DA, lake water and tap water for 4-NP with satisfactory results. So, the proposed fluorescent probe is more precise detection for biological and environmental applications.
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JOURNAL OF POROUS MATERIALS
·
2021
·Vol. 28
·期 4
·1005-1009
·
IF 2.496
Zhang Jianhui,Chen Jin,Cheng Lei,Wang Yu,Fu Jing
A facile and effective synthetic route has been utilized to synthesize nanoporous carbons (NPCs)/cobalt nanoparticles (CoNPs) composites by direct carbonization of a Co-MOF. The combination of various spectroscopic tools demonstrated that the CoNPs (about 5 nm in diameter) in the resultant composites were evenly installed in the carbon matrix without any aggregations. Furthermore, the size of the CoNPs can be easily controlled by adjusting the temperature of the hydrothermal treatment. Results of UV–Visible spectrophotometer demonstrated the significant effects of the obtained structure on the reduction of the targeted pollutant 4-nitrophenol (4-NP). The high reaction activity catalysed by CoNPs with the presence of sodium borohydride is attributed to nanostructure advantage and the high surface area.
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BIORESOURCE TECHNOLOGY
·
2021
·
IF 9.642
Qiang Chen,Mingzhao Guo,Yuexin Bi,Ge Qu,Zhoutong Sun,Yujun Wang,Guangsheng Luo
This work aims to synthesize S -(4-chlorophenyl)-(pyridin-2-yl) methanol ( S -CPMA) in a green, economic, and efficient way. In the water–cyclohexane liquid–liquid system, recombinant Escherichia coli ( E. coli ) was used as a whole-cell catalyst and retained > 60% of its catalytic activity after five reuse cycles. In situ accumulation of the substrate/product in the organic phase effectively improves substrate tolerance and reduces product inhibition and toxicity. Meanwhile, a microreaction system consisting of membrane dispersion and three-dimensional (3D) bending-microchannel was developed to successfully generate droplet swarms with an average diameter of 30 μm. Large specific surface area provided high mass transfer efficiency between phases. While the analogous reaction in a traditional stirred tank required > 270 min to achieve a yield of > 99%, in this biphasic microreaction system, the yield reached 99.6% with a high enantiomeric excess (ee) of > 99% in only 80 min. Efficient synthesis was achieved by reducing the time by 70%.
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MOLECULES
·
2021
·Vol. 26
·期 6
·1545
·
IF 4.412
Xia Niu,Xiaomei Wang,Bingyu Niu,Guoqing Li,Xinyi Yang,Yucheng Wang,Guiling Li
Background: Liver fibrosis, as a common and refractory disease, is challenging to treat due to the lack of effective agents worldwide. Recently, we have developed a novel compound, N-(3,4,5-trichlorophenyl)-2(3-nitrobenzenesulfonamide) benzamide (IMB16-4), which is expected to have good potential effects against liver fibrosis. However, IMB16-4 is water-insoluble and has very low bioavailability. Methods: Mesoporous silica nanoparticles (MSNs) were selected as drug carriers for the purpose of increasing the dissolution of IMB16-4, as well as improving its oral bioavailability and inhibiting liver fibrosis. The physical states of IMB16-4 and IMB16-4-MSNs were investigated using nitrogen adsorption, thermogravimetric analysis (TGA), HPLC, UV-Vis, X-ray diffraction (XRD) and differential scanning calorimetry (DSC). Results: The results show that MSNs enhanced the dissolution rate of IMB16-4 significantly. IMB16-4-MSNs reduced cytotoxicity at high concentrations of IMB16-4 on human hepatic stellate cells LX-2 cells and improved oral bioavailability up to 530% compared with raw IMB16-4 on Sprague–Dawley (SD) rats. In addition, IMB16-4-MSNs repressed hepatic fibrogenesis by decreasing the expression of hepatic fibrogenic markers, including α-smooth muscle actin (α-SMA), transforming growth factor-beta (TGF-β1) and matrix metalloproteinase-2 (MMP2) in LX-2 cells. Conclusions: These results provided powerful information on the use of IMB16-4-MSNs for the treatment of liver fibrosis in the future.Keywords:mesoporous silica nanoparticle;liver fibrosis;oral bioavailability;TGF-β1;dissolution rate
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Xue-Qi Zhang,Rong-Fang Shen,Xiao-Jing Guo,Xi Yan,Yan Chen,Jiang-Tao Hu,Wan-zhong Lang
Herein, a convenient and environment-friendly grafting and reduction strategy was used to anchor bimetallic Ag-Cu nanoparticles on polypropylene (PP) fabrics. The as-prepared samples were characterized by various techniques including FE-SEM, XRD, EDX, XPS and FT-IR. The as-prepared sample exhibits excellent activity on the catalytic reduction of highly concentrated 4-NP, and the synergistic effect between Ag and Cu nanoparticles was proved. The entire catalytic reduction was generally considered to obey pseudo-order kinetics, affording high conversion even after 15 successive recycles. These results showed that the PP based composite with Ag-Cu nanoparticles effectively provided superb catalytic efficiency and stability in 4-nitrophenol reduction, and the PP based composites were suitable in practical applications for the treatment of diverse waste water.
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JOURNAL OF INORGANIC BIOCHEMISTRY
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2020
·
IF 3.212
Han-Long Cheng,Hai-Ling Guo,An-Jian Xie,Yu-Hua Shen,Man-Zhou Zhu
At present, cancer has become a major disease threatening human health worldwide. Therefore, developing targeting guided multimode synergetic therapy has become one of the hot spots in current antitumor research and is also a great challenge. Herein, a new Fe 3 O 4 /g-C 3 N 4 @PPy-DOX nanocomposite containing magnetic iron oxide (Fe 3 O 4 ) nanoparticles (NPs), lamellar structure of graphite-like carbon nitride (g-C 3 N 4 ) and polypyrrole (PPy) shell with the loaded anti-tumor drug doxorubicin hydrochloride (DOX) was designed and prepared. The monodisperse Fe 3 O 4 nanoparticles (NPs) with the diameter of 20 nm endowed the nanocomposite with the magnetic targeting ability, reducing damage to normal tissues. It is very interesting that the Fe 3 O 4 NPs also possessed photosensitizer function for photodynamic therapy (PDT). The g-C 3 N 4 sheets as the photocatalysis towards the degradation of water for generating O 2 could effectively improve the hypoxia of solid tumors and increase the efficiency of PDT. In addition, PPy has high light-to-heat conversion efficiency, so was chosen for the cancer photothermal therapy (PTT). Finally, an anticancer drug (DOX) was loaded on the nanocomposite because the presence of mesoporous structure. Thus, the prepared Fe 3 O 4 /g-C 3 N 4 @PPy-DOX nanocomposites exhibit synergetic chemotherapy/PTT/enhanced PDT antitumor effect. This study provides an inspiration for combining targeting and multimodality to improve the anticancer efficiency.
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