CHROMATOGRAPHIA
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2022
·Vol. 85
·期 8
·733-741
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IF 2.213
Zhang Qianchun,Wang Yutong,Yang Bingnian,Bao Linchun,Wu Yun,Wang Xingyi
Estrogen plays a crucial role in various stages of human development and is present in the human body at trace level; therefore, an efficient strategy for the quantitative analysis of trace estrogens is required. However, this analysis is complicated by the presence of extremely complex biological matrices. To address this challenge, a novel method based on monolithic column solid-phase microextraction and ultra-high-performance liquid chromatography-tandem mass spectrometry was developed for the sensitivity analysis of six estrogens: β-estradiol, α-estradiol, 17α-ethynylestradiol, estrone, diethylstilbestrol, and hexestrol, in human urine and serum samples. The method exhibits a low limit of detection (8.6–37 ng L −1 ), with wide linear ranges (0.10–25 μg L −1 ) for each analyte and remarkable correlation coefficients ( R 2 = 0.9953–0.9995). The developed method was successfully used to detect estrogens in urine and serum samples. The six analytes were satisfactorily recovered between 76.2 and 107% with relative standard deviations ranging from 2.5 to 8.3% ( n = 3). The results demonstrated that the developed method, based on a poly(methacrylic acid/3-acrylamidophenylboronic acid-co-ethylene glycol dimethacrylate) monolithic column, is an effective enrichment approach toward the analysis of trace estrogens in human urine and serum samples. Graphical abstract
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2022
·Vol. 38
·期 6
·1547-1552
·
IF 2.726
Jin Huan,Xu Ding,Tian Chao,Yue Yinghong,Hua Weiming,Gao Zi
A series of Sm-doped CeO 2 /Beta composite catalysts with various Sm/Ce atomic ratios(0.1–0.4) were prepared by an incipient impregnation method, followed by calcination at 650 °C. They were characterized by X-ray diffraction(XRD), N 2 adsorption, X-ray photoelectron spectroscopy(XPS), Raman, NH 3 -temperature programmed desorption(TPD) and CO 2 -TPD. The incorporation of Sm into CeO 2 /Beta increases obviously the propylene yield for the selective conversion of ethanol to propylene. The promoting effect of Sm on CeO 2 /Beta can be attributed to two reasons. One is more acetone intermediates are generated on the Sm-doped catalysts due to the enhanced formation of oxygen vacancies. The other is the conversion of acetone intermediate to propylene is enhanced owing to weaker and fewer acid sites on the Sm-doped catalysts.
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JOURNAL OF NANOBIOTECHNOLOGY
·
2022
·Vol. 20
·期 1
·1-20
·
IF 9.429
Zhang Ying,Zhu Jingyao,Zhang Zheng,He Dannong,Zhu Jun,Chen Yunsheng,Zhang Yixin
The anticancer treatment is largely affected by the microenvironment of the tumors, which not only resists the tumors to the thermo/chemo-therapy, but also promotes their growth and invasion. In this work, the angiogenesis factor is balanced by combining with the breathing hyperoxygen, for regulating the tumor microenvironment and also for relieving hypoxia and high tissue interstitial pressure, which promote drug delivery to tumor tissues by increasing the in vivo perfusion and reversing the immunosuppressive tumor. In addition, the designed multifunctional nanoparticles have a great potential for applications to the tumor dual-mode imaging including magnetic resonance (MR) and photoacoustic (PA) imaging. This work proposes a promising strategy to enhance the thermo/chemo-therapy efficacy by remodeling the tumor microenvironment, which would provide an alternative to prolong the lifetime of tumor patients. Graphical Abstract
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 33
·16080-16090
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IF 4.682
Li Min,Zhang Mingpan,Mahar Faraz Khan,Wei Longqin,Wang Zhuopu,Wang Xujing,Wei Kai
Passive radiation cooling technology reflects sunlight and emits infrared thermal radiation into the cold outer space through the transparent window of the atmosphere (8–13 \(\mathrm{\mu m}\) ) without consuming any energy to cool objects. Therefore, it has potential application prospects in many fields and has attracted the wide attention of researchers. In recent years, photonic radiators and metamaterials have been studied in passive radiative cooling. However, they are usually not flexible, low ductility, complex shape and demand a high level of precision, which severely restricts large-scale manufacturing and limits their practical application. A simple and high-efficient electrospinning method with inexpensive raw materials is demonstrated for fabricating a high-performance fibrous and stretchable polymer nanofiber for daytime passive radiation cooling that consists of polyvinylidene fluoride and polydisperse silicon dioxide (SiO 2 ) microspheres. For effective scattering by nanofiber structures and silica microspheres, the membrane exhibits an average solar reflectivity of 92.3%. The molecular vibration of polyvinylidene fluoride and phonon polarization resonance of silica microspheres result in an average atmospheric window transmissivity of 0.86. The daytime cooling performance has experimentally demonstrated a maximum temperature decrease up to 5.8 °C under an average solar intensity of 700.8 W/m 2 . This work provides a promising method for the scale-up production of radiative coolers with high performance.
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APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2022
·Vol. 195
·期 1
·33-50
·
IF 3.094
Sun Qiao,Zhang Xu,Gao Mengchu,Zhang Chunxiao,Peng Biyu
Elastin is considered an excellent resource for obtaining antioxidant peptides due to unique amino acid composition. However, it is hardly soluble in water or in dilute acid or alkali; most of the elastases have low yields for preparing elastin peptides, making it difficult to meet industrial applications. To address above problems, enzymes capable of hydrolyzing elastin into soluble peptides were preferred from typical commercial protease preparations. The optimal enzymatic hydrolysis process conditions for elastin peptides were obtained by response surface optimization design. The molecular weight, amino acid composition, and antioxidant activity of the enzymatic hydrolysis products were determined. The results show that the alkaline protease NUE has a strong hydrolysis effect. The optimized enzymatic hydrolysis conditions are as follows: substrate concentration is 5%, enzyme concentration is 650 U/mL, pH is 10.0, temperature is 60 °C, time is 6 h. The degree of hydrolysis of elastic protein peptides obtained through this method is 14.42%. The distribution of molecular weight is 200–6500 Da, more than 85% of the component molecular amount is greater than 800 Da; the amino acid content related to antioxidant activity has reached 68 mg/100 mg, so it has extremely high free radical clearance. Compared with acid and alkali methods, the anti-oxidation capacity of enzyme-based peptide is better, the reaction conditions are milder, the yield is higher, and by-products and pollutants are fewer. It provides an effective way to industrialized production of elastin peptides with high antioxidant activity and a basis for its widespread application in the food and pharmaceutical industries.
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JOURNAL OF NANOBIOTECHNOLOGY
·
2022
·Vol. 20
·期 1
·1-17
·
IF 9.429
Lu Libin,Zhang Jiaru,Guan Kai,Zhou Jin,Yuan Fusong,Guan Yingchun
The failure of orthopedic and dental implants is mainly caused by biomaterial-associated infections and poor osseointegration. Surface modification of biomedical materials plays a significant role in enhancing osseointegration and anti-bacterial infection. In this work, a non-linear relationship between the micro/nano surface structures and the femtosecond laser processing parameters was successfully established based on an artificial neural network. Then a controllable functional surface with silver nanoparticles (AgNPs) to was produced to improve the cytocompatibility and antibacterial properties of biomedical titanium alloy. The surface topography, wettability, and Ag + release were carefully investigated. The effects of these characteristics on antibacterial activity and cytocompatibilty were also evaluated. Results show that the prepared surface is hydrophobic, which can prevent the burst release of Ag + in the initial stage. The prepared surface also shows both good cytocompatibility toward the murine calvarial preosteoblasts MC3T3-E1 cells (derived from Mus musculus (mouse) calvaria) and good antibacterial effects against Gram-negative ( E. coli ) and Gram-positive ( S. aureus ) bacteria, which is caused by the combined effect of appropriate micro/nano-structured feature and reasonable Ag + release rate. We do not only clarify the antibacterial mechanism but also demonstrate the possibility of balancing the antibacterial and osteointegration-promoting properties by micro/nano-structures. The reported method offers an effective strategy for the patterned surface modification of implants. Graphical Abstract
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-10
·
IF 17.694
Wang Zhe,Wang Chunpeng,Mao Shanjun,Lu Bing,Chen Yuzhuo,Zhang Xie,Chen Zhirong,Wang Yong
Decoupling the electronic and geometric effects has been a long cherished goal for heterogeneous catalysis due to their tangled relationship. Here, a novel orthogonal decomposition method is firstly proposed to settle this issue in p -chloronitrobenzene hydrogenation reaction on size- and shape-controlled Pt nanoparticles (NPs) carried on various supports. Results suggest Fermi levels of catalysts can be modulated by supports with varied work function ( W f ). And the selectivity on Pt NPs of similar size and shape is linearly related with the W f of support. Optimized Fermi levels of the catalysts with large W f weaken the ability of Pt NPs to fill valence electrons into the antibonding orbital of C–Cl bond, finally suppressing the hydrodehalogenation side reaction. Foremost, the geometric effect is firstly spun off through orthogonal relation based on series of linear relationships over various sizes of Pt NPs reflecting the electronic effect. Moreover, separable nested double coordinate system is established to quantitatively evaluate the two effects.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2022
·Vol. 26
·期 10
·2119-2131
·
IF 2.747
Waenkaew Paralee,Saipanya Surin,Themsirimonkon Suwaphid,Maturost Suphitsara,Jakmunee Jaroon,Pongpichayakul Natthapong
Recently, Pt-based catalysts on mixed carbon supporters have been introduced for enhancement of the formic acid oxidation (FAO) reaction. Herein, carbon black (CB) and carbon nanotubes (CNT) were combined as a hybrid CB-CNT carbon support. The Brunauer–Emmett–Teller (BET) surface area of CB-CNT support presented the increased pore size and volume, providing high surface areas for electroactive species diffusion. By cyclic voltammetry (CV), the noble metals (M) including platinum (Pt), palladium (Pd), gold (Au), and ruthenium (Ru) were utilized for catalytic electrodepositing on the CB-CNT support to obtain the catalysts. The M/CB-CNT and PtM/CB-CNT catalysts prepared under the controlled condition were characterized and compared their activities and stabilities. Among the prepared catalysts, the small particle sizes of PtM/CB-CNT, which occurred with high Pt(111) intensities from face-centered cubic (fcc) structure, were confirmed by X-ray diffraction analysis (XRD) and transmission electron microscopy (TEM). Also, the X-ray photoelectron spectroscopy (XPS) indicated the highest peak ratio of metallic Pt from PtPd/CB-CNT that was related to its high catalytic active surfaces. In the monometallic systems, the Pt/CB-CNT and Pd/C-CNT catalysts actively promote the oxidation of formic acid molecules by their unique pathways. Among the prepared catalysts in both mono- and bimetallic systems, PtPd/CB-CNT showed the highest current intensity of 11.48 mA cm −2 at a potential of 0.70 V in FAO reaction for formic acid oxidation. Although Pt/CB-CNT provided the lowest potential at maximum current intensity ( E CO = 0.51 V), PtPd/CB-CNT astonishingly presented the highest active surface area (ECSA CO = 0.57 cm 2 ) for CO oxidation. The PtPd/CB-CNT catalyst showed the co-existence between Pt and Pd nanoparticles, and the hybrid structure of CB-CNT provided the improved electrochemical results towards FAO reaction. Graphical abstract
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Journal of Sustainable Metallurgy
·
2022
·Vol. 8
·期 3
·1090-1103
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IF 3.068
Jin Yonglong,Gao Lihua,He Zhijun,Sun Yujia
An economic and effective strategy synchronously utilizing blast furnace bag dust (BF-BD) and converter-removing dust (C-RD) by carbothermic reduction roasting is reported to achieve separation and recovery of iron and zinc. In this paper, the effect of operating parameters on the recovery rate and remove rate of Fe and Zn from BD and GD was initially studied by synergetic carbothermic roasting reduction. The optimized parameters include a reduction temperature pf 1200 °C, a reduction time of 90 min, a FC/O of 2.0, and a proportion of C-RD/BF-BD of 7:3, and the removal efficiency of Zn and metallization degree of Fe reached 98.35% and 90.58%, respectively. The phase transformation and stepwise reduction behavior of wüstite (ZnO) x (FeO) 1− x , spinel Zn x Fe 1− x Al 2 O 4 , olivine Zn x Fe 2− x SiO 4 , and gehlenite Zn z Fe 2− x SiAl 2 O 7 are systematically investigated by SEM–EDS, XRD, TG/DTG, and thermodynamic analyses. It was found that the formation of wüstite (ZnO) x (FeO) 1− x as an intermediates plays an crucial role in the formation of metallic Zn–Fe–C alloy. Phase transformation and reduction mechanisms of C-RD and BF-BD and the interfacial reaction formation mechanism of wüstite (ZnO) x (FeO) 1− x were discussed and clarified in synergistic carbothermic reduction process. Graphical Abstract
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Advanced Fiber Materials
·
2022
·Vol. 4
·期 5
·1219-1232
·
IF 12.958
Jiao Yongjie,Li Xiaojing,Chen Jinjie,Li Chaojing,Liu Laijun,Liu Xingxing,Wang Fujun,Chen Guang,Wang Lu
Fibrosis is a common problem in soft tissue regeneration, often caused by the differentiation of fibroblasts into myofibroblasts. Because of the nanoscale topology that regulates the mechanical transduction of cells, nanofibers or nanoparticles are commonly used to modulate fibroblast differentiation. However, the strength of nanofibers is insufficient, and the physiological toxicity of nanoparticles still remains to be verified. In this study, self-induced crystallization was used to construct nano-protrusions on the random and aligned polycaprolactone microfibers to regulate the behavior of fibroblasts. The results revealed that the mechanical properties of microfibers with a nanoscale topology were improved. Immunofluorescence staining manifested that nano-protrusions impeded the activation of integrins and vinculins, thereby inhibiting the nuclear transfer of Yes-associated protein, resulting in a decrease in the expression of α- smooth muscle actin. Nanoscale topology of microfibers hampered the activation of the Rho/ROCK signalling pathway. In general, we used a simple process to construct a fibrous scaffold with a micro-nano multilevel structure. This structure can hinder the transformation of fibroblasts into myofibroblasts on both random and aligned fibers, which is expected to prevent fibrosis. Graphical abstract
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CLAYS AND CLAY MINERALS
·
2022
·Vol. 70
·期 3
·450-459
·
IF 2.207
Wang Yan,Zhuang Yu,Wang Sheng,Liu Yin,Kong Lingbing,Li Jianjun,Chen Huayong
In order to develop high-performance adsorbents to remove toxic methylene blue (MB) from wastewater, palygorskite (Plg) was utilized as a template to prepare palygorskite/carbon (Plg/C) composites by using a hydrothermal reaction in the presence of glucose. The porous Plg/C composites were then activated with ZnCl 2 . The effects of the dose of the activator and the activation temperature on the crystal structure, micro-morphology, specific surface area, and adsorption performance of the porous Plg/C composites were studied systematically here. X-ray diffraction (XRD) and scanning electron microscopy (SEM) results indicated that the crystal structure of Plg was destroyed during the activation process and irregular porous carbon was closely attached to the residual aluminosilicate skeleton. The activation was optimized at 400°C with a ZnCl 2 :Plg/C impregnation ratio of 2:1. The sample had a specific surface area of 1497.88 m 2 /g, together with a total pore volume and micropore volume of 1.0355 and 0.5464 cm 3 /g, respectively. The MB adsorption capacity was 381.04 mg/g. Such inexpensive, high-performance, porous Plg/C composites could find potential applications in wastewater treatment.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 51
·77851-77863
·
IF 5.19
Jiang Changjin,Zhang Ting,Li Shuhui,Yang Zhaoguang
Fe(III)-chitosan and Fe(III)-chitosan-CTAB composites were prepared using an ionotropic gelation method. Various techniques were used to analyze the morphology, structure, and property of the adsorbents, including SEM, EDS, FT-IR, XPS, and zeta potential. Compared with Fe(III)-chitosan, Fe(III)-chitosan-CTAB was more effective for As(V) adsorption at a wide range of pH (3.0–8.0). The adsorption of As(V) onto Fe(III)-chitosan and Fe(III)-chitosan-CTAB could reach equilibrium in 20 min, and their maximum adsorption capacities were 33.85 and 31.69 mg g ‒1 , respectively. The adsorption kinetics was best described by the pseudo-second-order model ( R 2 = 0.998 and 0.992), whereas the adsorption isotherm was fitted well by the Freundlich model ( R 2 = 0.963 and 0.987). The presence of H 2 PO 4 – significantly inhibited the adsorption of As(V) onto Fe(III)-chitosan and Fe(III)-chitosan-CTAB, and humic acid also led to a slight decrease in As(V) adsorption by Fe(III)-chitosan-CTAB. Over 94% of As(V) at the initial concentration of no more than 5 mg L –1 was removed from real water by the two adsorbents. 1% (w/v) NaOH solution was determined to be the most suitable desorption agent. Fe(III)-chitosan and Fe(III)-chitosan-CTAB still maintained their initial adsorption capacities after five adsorption–desorption cycles. Based on different characterization results, both electrostatic attraction and surface complexation mechanisms played important roles in As(V) adsorption on Fe(III)-chitosan and Fe(III)-chitosan-CTAB.
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