CHEMICAL PAPERS
·
2023
·Vol. 77
·期 10
·5999-6006
·
IF 2.2
Yuan Yifan,He Fuduo,Li Xue,Xu Dehua,Yan Zhengjuan,Wang Xinlong
Corncob has a high yield and contains a large number of cellulose substances. Wet phosphoric acid hydrolysis of corncob is of great significance to the utilization of organic waste, and provides theoretical support for the development of sugar-containing synergistic phosphorus fertilizers. In this study, the kinetics of hydrolysis of corncob by wet process phosphoric acid was investigated. The time evolution of total sugar, xylose and furfural formation during a 12-h hydrolysis was simulated by Saeman and biphasic models within differential acid concentrations and temperatures. The formations of both total sugar and furfural coincide a first-order irreversible reaction, which was not applicable to the Saeman model nor the biphasic model. Meanwhile, xylose formation was more suitable for the Saeman model. The optimal conditions for xylose are: a temperature of 100 °C, a reaction time of 720 min, an acid concentration of 55.6% (w/w). The xylose yield of corncobs was 0.15 g/g in the optimal conditions. Graphical abstract
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FIBERS AND POLYMERS
·
2023
·Vol. 24
·期 6
·1903-1917
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IF 2.5
Tian Qianjun,Huang Zhichao,Wang Lin,Shi Lei,Shen Liangen,Qi Dongming
Self-healing polyurethane materials with excellent mechanical properties have a wide range of applications, including textiles, clothing, leather, and flexible electronics. However, determining methods to obtain this material in green and environment-friendly ways is an interesting and challenging task. In this study, a series of self-healing polyurethane materials with soft segments containing diselenide bonds and hard segments including multiple hydrogen bonds were prepared using a solvent-free method. The characterization results demonstrated that the T–Se–SFPU–2 sample exhibited both favorable self-healing function as well as mechanical properties with a tensile breaking strength of 6.15 MPa, and the greatest healing effect was achieved after 6 h at room temperature under visible light. The research results further demonstrated that the hydrogen bond in the hard segment can considerably improve the mechanical properties of polyurethane. The best micro-phase separation was achieved by controlling the hydrogen bond content in the hard segment, achieving a force balance between the soft and hard segments, and finally, the optimal balance between the self-healing performance and mechanical strength of polyurethane was achieved. These results provide a new strategy for preparing polymers with different self-healing capabilities.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 11
·1-15
·
IF 6.408
Jin Pian,Zhu Fucheng,Jiang Mi,Takafuji Makoto,Ihara Hirotaka,Nie Lei,Liu Houmei
In view of the limitations of existing berberine solid-phase extraction adsorbents, this paper proposes a novel carbonized π-conjugated polymer-coated porous silica (SiO 2 @C-π-CP) adsorbent with simple process and low cost for efficient extraction of berberine by multiple interactions. Characterization methods, including Brunner–Emmet–Teller measurement, thermogravimetric analysis, X-ray photoelectron spectroscopy, and scanning electron microscopy techniques, were used to verify the successful modification of carbonized π-conjugated polymer on the surface of porous silica. The berberine was selected as target molecule, and the adsorption mechanism and process were investigated through adsorption kinetics, adsorption isotherms, and thermodynamic studies. The fitting results show that the adsorption of berberine by SiO 2 @C-π-CP well conforms to the pseudo-second-order and Langmuir models. By optimizing the main SPE parameters, the SPE method based on SiO 2 @C-π-CP was developed. Excellent results were obtained, including low limit of detection (0.75 ng mL −1 ) and limit of quantification (2 ng mL −1 ), wide linearity (2–13,000 ng mL −1 ), and satisfactory relative standard deviations (RSD) of inter-day (1.5%) and intra-day (6.2%). Finally, the SiO 2 @C-π-CP also has been successfully used to the enrichment of berberine in real urine samples. This research makes clear that SiO 2 @C-π-CP has outstanding potential for trace enrichment of berberine alkaloids. Graphical abstract
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JOURNAL OF MATERIALS SCIENCE
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2022
·Vol. 57
·期 37
·17765-17778
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IF 4.682
Wang Congcong,Feng Xiaohua,Tong Xiangmin,Wang Ying,Li Hua
We have witnessed booming demands in recent years from fabrics industry for desired antibacterial properties. In this essay, we are reporting the selection and characterization of photocatalytic nanosized TiO 2 particles for potential use in fabrics for antibacterial activities. The nanoparticles within a certain size range are simply immersing-loaded on the surfaces of fabrics to examine their physicochemical and antibacterial properties. Toxicity of the materials is evaluated by flow cytometry testing by using mouse fibroblasts. The results have shown that the efficient photocatalytic degradation of E. coli bacteria and the toxicity of the TiO 2 particles are size-dependent and concentration-dependent. The particles below 40 nm in size and higher than 50 μg/mL in concentration slightly harm the fibroblasts cells, while those above 40 nm in size and higher than 50 μg/mL in concentration do not deteriorate the behaviors of the cells. The easiness and cost efficiency of coating processing of the photocatalytic particles and their remarkable antibacterial activities will give insights into their widespread applications to combating infectious microorganisms in fabric industry.
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CATALYSIS LETTERS
·
2022
·Vol. 153
·期 8
·2504-2516
·
IF 2.936
Chen Jiaxuan,Hu Shen,Chen Zhuo,Sun Xincheng,Chen Minhao,Chen Tianjiao,Ye Guanghua,Zhou Xinggui
The effects of molecular size on SiO 2 deposition regulated surface barriers and zeolite catalysis are probed, taking n -pentane isomerization and benzene alkylation with ethylene as model reactions. Chemical liquid deposition of SiO 2 on the parent ZSM-5 sample only modifies its external surface slightly and passivates a small proportion of Brønsted acid sites. The apparent diffusivities increase significantly at 363–393K after SiO 2 deposition, indicating SiO 2 on ZSM-5 crystals reduces surface barriers at low temperatures. The conversion for n -pentane isomerization increases by up to 26% after SiO 2 deposition, while the conversion for benzene alkylation decreases by up to 19%. Obviously, the positive effect of SiO 2 deposition can be balanced out by the pore confinement effect at high temperatures, which is stronger for a larger molecule. This work provides a unique understanding of molecular size effects on surface barriers, which should serve to guide the design of zeolite catalysts. Graphical Abstract
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-11
·
IF 17.694
Dong Haijiao,Du Wei,Dong Jian,Che Renchao,Kong Fei,Cheng Wenlong,Ma Ming,Gu Ning,Zhang Yu
As pioneering Fe 3 O 4 nanozymes, their explicit peroxidase (POD)-like catalytic mechanism remains elusive. Although many studies have proposed surface Fe 2+ -induced Fenton-like reactions accounting for their POD-like activity, few have focused on the internal atomic changes and their contribution to the catalytic reaction. Here we report that Fe 2+ within Fe 3 O 4 can transfer electrons to the surface via the Fe 2+ -O-Fe 3+ chain, regenerating the surface Fe 2+ and enabling a sustained POD-like catalytic reaction. This process usually occurs with the outward migration of excess oxidized Fe 3+ from the lattice, which is a rate-limiting step. After prolonged catalysis, Fe 3 O 4 nanozymes suffer the phase transformation to γ-Fe 2 O 3 with depletable POD-like activity. This self-depleting characteristic of nanozymes with internal atoms involved in electron transfer and ion migration is well validated on lithium iron phosphate nanoparticles. We reveal a neglected issue concerning the necessity of considering both surface and internal atoms when designing, modulating, and applying nanozymes.
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-14
·
IF 17.694
Zhang Zhe,Peng Haoran,Yang Dongchen,Zhang Guoqing,Zhang Jinlin,Ju Feng
Evidence for microbial degradation of polyvinyl chloride (PVC) has previously been reported, but little is known about the degrading strains and enzymes. Here, we isolate a PVC-degrading bacterium from the gut of insect larvae and shed light on the PVC degradation pathway using a multi-omic approach. We show that the larvae of an insect pest, Spodoptera frugiperda , can survive by feeding on PVC film, and this is associated with enrichment of Enterococcus , Klebsiella and other bacteria in the larva’s gut microbiota. A bacterial strain isolated from the larval intestine ( Klebsiella sp. EMBL-1) is able to depolymerize and utilize PVC as sole energy source. We use genomic, transcriptomic, proteomic, and metabolomic analyses to identify genes and proteins potentially involved in PVC degradation (e.g., catalase-peroxidase, dehalogenases, enolase, aldehyde dehydrogenase and oxygenase), and propose a PVC biodegradation pathway. Furthermore, enzymatic assays using the purified catalase-peroxidase support a role in PVC depolymerization.
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Stem Cell Research & Therapy
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2022
·Vol. 13
·期 1
·1-16
·
IF 8.079
Meng Zhaosong,Liu Jiacheng,Feng Zhipeng,Guo Shuling,Wang Mingzhe,Wang Zheng,Li Zhe,Li Hongjie,Sui Lei
Background Dental follicle stem cells (DFSCs) show mesenchymal stem cell properties with the potential for alveolar bone regeneration. Stem cell properties can be impaired by reactive oxygen species (ROS), prompting us to examine the importance of scavenging ROS for stem cell-based tissue regeneration. This study aimed to investigate the effect and mechanism of N-acetylcysteine (NAC), a promising antioxidant, on the properties of DFSCs and DFSC-based alveolar bone regeneration.Methods DFSCs were cultured in media supplemented with different concentrations of NAC (0–10 mM). Cytologic experiments, RNA-sequencing and antioxidant assays were performed in vitro in human DFSCs (hDFSCs). Rat maxillary first molar extraction models were constructed, histological and radiological examinations were performed at day 7 post-surgery to investigate alveolar bone regeneration in tooth extraction sockets after local transplantation of NAC, rat DFSCs (rDFSCs) or NAC-treated rDFSCs.Results 5 mM NAC-treated hDFSCs exhibited better proliferation, less senescent rate, higher stem cell-specific marker and immune-related factor expression with the strongest osteogenic differentiation; other concentrations were also beneficial for maintaining stem cell properties. RNA-sequencing identified 803 differentially expressed genes between hDFSCs with and without 5 mM NAC. “Developmental process (GO:0032502)” was prominent, bioinformatic analysis of 394 involved genes revealed functional and pathway enrichment of ossification and PI3K/AKT pathway, respectively. Furthermore, after NAC treatment, the reduction of ROS levels (ROS, superoxide, hydrogen peroxide), the induction of antioxidant levels (glutathione, catalase, superoxide dismutase), the upregulation of PI3K/AKT signaling (PI3K-p110, PI3K-p85, AKT, phosphorylated-PI3K-p85, phosphorylated-AKT) and the rebound of ROS level upon PI3K/AKT inhibition were showed. Local transplantation of NAC, rDFSCs or NAC-treated rDFSCs was safe and promoted oral socket bone formation after tooth extraction, with application of NAC-treated rDFSCs possessing the best effect.Conclusion sThe proper concentration of NAC enhances DFSC properties, especially osteogenesis, via PI3K/AKT/ROS signaling, and offers clinical potential for stem cell-based alveolar bone regeneration.
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NEUROCHEMICAL RESEARCH
·
2022
·Vol. 48
·期 2
·570-578
·
IF 4.414
Guo Shenglong,Lei Qi,Guo Hena,Yang Qian,Xue Yanli,Chen Ruili
Ferroptosis and neuroinflammation play a crucial role in the pathogenesis of Alzheimer’s disease (AD), and Edaravone (EDA) has been demonstrated to have anti-inflammatory, antioxidant and neuroprotective effects in neurodegenerative diseases. However, the relationship between EDA and ferroptosis in AD is unidentified. This research aimed to elucidate the mechanism of EDA in AD with Aβ 1-42-induced HT22 cells as in vitro cell model. The results showed that EDA could significantly reduce Aβ 1-42 -induced apoptosis of HT22 cells and formation of pro-inflammatory factors TNF-α, IL-1β and IL-6, prevent the activation of TLR4/NF-κB /NLRP3 signaling pathway, and inhibit ferroptosis and lipid peroxidation. Taken together, EDA contributes to inhibiting neuroinflammatory injury and ferroptosis in Aβ 1-42-induced HT22 cells, and thus may be a potential candidate for the treatment of AD.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2022
·Vol. 415
·期 1
·157-166
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IF 4.478
Yang Zuan,Hu Jing,Zhang Xiaoyu,Yang Huimin,Meng Peiran,Zhao Huanying,Sun Yue
Sensitive determination of ofloxacin (OFL) is very essential for human health and environmental protection. Here, a novel composite of gold nanoparticles(nAu)@MXene(Ti 3 C 2 T x )/poly- p -aminobenzene sulfonic acid (PABSA) was fabricated on the surface of glassy carbon electrode (GCE) and used to sensitively determine OFL. The results of experiments showed that the obtained nAu@Ti 3 C 2 T x /PABSA/GCE electrode could be used as an electrochemical sensor to directly detect ofloxacin (OFL) by differential pulse voltammetry (DPV). Under the optimal conditions, the proposed electrode displayed a broader linear range and a lower detection limit (LOD) for OFL determination when it was compared to those similar sensors. The linear range was from 5.0 × 10 −8 to 5.0 × 10 −4 mol/L and the LOD was 3.7 × 10 −8 mol/L ( S / N = 3). The nAu@Ti 3 C 2 T x /PABSA/GCE electrode also showed good selectivity, repeatability, and reproducibility. Finally, the proposed electrode was used to detect OFL in commercial samples by the standard addition method. The obtained recovery was from 97.3% and 105.7% showing its potential applications in actual sample analysis. Graphical Abstract
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FIBERS AND POLYMERS
·
2022
·Vol. 23
·期 11
·3058-3067
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IF 2.347
Ke Guizhen,Chen Shuhui,Tang Jiani,Li Huanmin,Liu Keshuai
Biodegradable oil absorbing materials have attracted extensive attention in dealing with oil spill pollution. To develop more excellent oleophilic oil sorbent, the combination of tannic acid and ferrous sulfate was employed to treat the renewable and biodegradable natural kapok fiber. The as-prepared kapok showed superhydrophobic characteristics with high water contact for the formation of tannic acid and ferrous ion complex on kapok surface, which was confirmed by scanning electron microscopy observation and infrared spectroscopy and X-ray diffraction analysis. The preparation process of the modified kapok fiber was optimized. When the sodium chlorite pretreated kapok fiber was firstly treated with 4.25 g/ l tannic acid and subsequently immersed in 4.25 g/ l tannic acid and 6.25 g/ l ferrous sulfate mixture at 60 °C for 15 min, the asprepared kapok fiber presented the best oil absorption capacity and hydrophobicity (water contact angle 150.7 °). The treated kapok had good adsorption capacity for oils and organic solvents, 48.2, 41.6, 53.4, 52.8, 49.2, 41.2 g/g for vegetable oil, diesel oil, silicone oil, carbon tetrachloride, DMF and n-hexane, respectively. In addition, the tannic acid and ferrous sulfate treated kapok was recycled for six times through simple mechanical squeezing, and showed good oil-water separation performance oil, indicating its potential application in the removal of spilled oil on water.
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WATER AIR AND SOIL POLLUTION
·
2022
·Vol. 233
·期 9
·1-16
·
IF 2.984
Zhang Zhen,Zhang Haotian,Woon Kok Sin,Zhu Xiaohu,Sui Yuhong,Luo Zifeng,Chen Lili,Yang Xiaoming,Gao Junyi,Wen Hongping,Jing Ran,Liu Tongzhou
Enhanced phytoextraction of metals using amendments and hyperaccumulator plants is a promising alternative to expensive traditional remediation techniques. The present study comprehensively investigated the effects of six amendments on both mobility and phytoextraction of Cd and the feasibility of integrating amendment with Ramie as a hyperaccumulator plant on Cd-contaminated soil remediation. The leaching of Cd from contaminated soil was significantly enhanced by two chelating agents (i.e., ethylenediaminetetraacetic acid (EDTA) and ethyleneglycoltetraacetic acid (EGTA)), followed by two natural organic acids (i.e., citric acid and tartaric acid), and lastly, two rhizobacteria (i.e., Bacillus subtilis and Pseudomonas fluorescens ). Further, the application of EDTA and EGTA had inhibitory effects on the growth of Ramie. The application of two organic acids and two rhizobacteria increased the dry biomass yields of roots, stems, and leaves. In terms of the dry biomass of Ramie, 32.7, 23.4, 50.6, and 53.1% of increases were obtained from the applications of citric acid, tartaric acid, B. subtilis , and P. fluorescens , respectively, as compared with that without any amendment applied. Meanwhile, the applications of all amendments were observed to increase Cd concentrations in aerial parts of the plants, and they were ranked in descending order of Cd accumulation: EDTA > EGTA > tartaric acid > citric acid > B. subtilis ≈ P. fluorescens . Taking Cd removal efficiency, potential environmental risk, and economic factor into consideration, EDTA and citric acid-enhanced phytoremediation using Ramie were feasible and promising approaches for remediating Cd-contaminated soil in real practice.
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