MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Jingjing Yu,Lili Shi,Yuxin Liu,Wei Liu,Mantang Chen,Xuehui Sun,Cong Nie,Fuwei Xie
FDA reported a HPHCs (Harmful and Potentially Harmful Constituents) list for tobacco products and tobacco smoke in 2012, which contained six carcinogenic aromatic amines (AAs). In this work, a sulfonated covalent triazine frameworks (CTF-SO 3 H) material was synthesized and used as a solid phase extraction (SPE) absorbent for highly effective enrichment and determination of six carcinogenic AAs in cigarette mainstream smoke (MSS), coupled with HPLC-MS/MS technique. The CTF-SO 3 H material was prepared with a rapid and facile method, which was superior to the general methods. The characterization with Nitrogen adsorption and desorption isotherm experiment, High resolution transmission electron microscopy (HTEM), etc, indicated that the CTF-SO 3 H material possessed sulfonic acid groups and abundant microporous structure. And the CTF-SO 3 H material showed good enrichment effect for AAs due to the synergistic effect of π-π stacking and electrostatic interactions. Limits of detection (LODs) of 6 AAs with the developed method were in the range of 0.01–0.11 ng cig −1 . Recoveries of 6 AAs were between 80.40% and 106.00%, while the intra-day and inter-day precisions were good (i.e. RSD intra ≤ 6.40%, RSD inter ≤ 9.90%). Commercial cigarette MSS samples were analyzed with the developed method, and a commercial cation exchange SPE column was chosen for comparison. Results obtained by two methods showed a good consistency. However, the CTF-SO 3 H material needed less dosage, even could be reused for 4 times. Thus, the developed method not only showed high enrichment efficiency, but also was economical.
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Qiguan Luo,Yunfei Liu,Guofu Zhou,Xuezhu Xu
Nanocellulose finds various applications in advanced electrical devices due to its impressive mechanical properties, thermal stability , and degradability. Cellulose nanocrystals (CNCs) with excellent dielectric properties may act as a fresh dielectric plastic. In this study, a new strategy of small molecule modification was used to improve the dielectric constant , breakdown strength, and band gap of the CNCs. The dipole moments , dipole density, and the anisotropic impact of surface groups on the dielectric constant were studied. The number of sulfates in the CNCs showed a gradient due to alkali treatment and sulfonation , which allowed for a controlled range of the dielectric constant of nanocellulose between 4.9 and 11.9. TEMPO oxidation (2,2,6,6-tetramethylpiperidine-1-oxyl) and cyanoethylation of the CNCs further increased the dielectric constant to 11.1 and 13.2, respectively, and the dielectric loss 10 −1 . By understanding and innovating organic polymer dielectrics, we can provide significant benefits to the electronics and device industries.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2023
·Vol. 21
·期 1
·1-14
·
IF 10.2
Yu Hao,Li Yijia,Pan Yining,Wang Hongning,Wang Wei,Ren Xiaobin,Yuan Hang,Lv Ziru,Zuo Yijia,Liu Zhirong,Lin Wei,Yao Qingqing
With increased diabetes incidence, diabetic wound healing is one of the most common diabetes complications and is characterized by easy infection, chronic inflammation, and reduced vascularization. To address these issues, biomaterials with multifunctional antibacterial, immunomodulatory, and angiogenic properties must be developed to improve overall diabetic wound healing for patients. In our study, we prepared porous poly (L-lactic acid) (PLA) nanofiber membranes using electrospinning and solvent evaporation methods. Then, sulfated chitosan (SCS) combined with polydopamine-gentamicin (PDA-GS) was stepwise modified onto porous PLA nanofiber membrane surfaces. Controlled GS release was facilitated via dopamine self-polymerization to prevent early stage infection. PDA was also applied to PLA nanofiber membranes to suppress inflammation. In vitro cell tests results showed that PLA/SCS/PDA-GS nanofiber membranes immuomodulated macrophage toward the M2 phenotype and increased endogenous vascular endothelial growth factor secretion to induce vascularization. Moreover, SCS-contained PLA nanofiber membranes also showed good potential in enhancing macrophage trans-differentiation to fibroblasts, thereby improving wound healing processes. Furthermore, our in vitro antibacterial studies against Staphylococcus aureus indicated the effective antibacterial properties of the PLA/SCS/PDA-GS nanofiber membranes. In summary, our novel porous PLA/SCS/PDA-GS nanofiber membranes possessing enhanced antibacterial, anti-inflammatory, and angiogenic properties demonstrate promising potential in diabetic wound healing processes.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2018
·Vol. 10
·期 11
·1287
·
IF 2.935
Wenmeng Zhang,Shaoyun Chen,Dongyang Chen,Zhuoliang Ye
Sterically hindered (S)-1,1′-binaphthyl-2,2′-diol had been successfully copolymerized with 4,4′-sulfonyldiphenol and 4,4′-difluorobenzophenone to yield fibrous poly(arylene ether ketone)s (PAEKs) containing various amounts of binaphthyl unit, which was then selectively and efficiently sulfonated using ClSO3H to yield sulfonated poly(arylene ether ketone)s (SPAEKs) with ion exchange capacities (IECs) ranging from 1.40 to 1.89 mmol·g−1. The chemical structures of the polymers were confirmed by 2D1H–1H COSY NMR and FT-IR. The thermal properties, water uptake, swelling ratio, proton conductivity, oxidative stability and mechanical properties of SPAEKs were investigated in detail. It was found that the conjugated but non-coplanar structure of binaphthyl unit endorsed excellent solubility and film-forming capability to SPAEKs. The SPAEK-50 with an IEC of 1.89 mmol·g−1exhibited a proton conductivity of 102 mS·cm−1at 30 °C, much higher than that of the state-of-the-art Nafion N212 membrane and those of many previously reported aromatic analogs, which may be attributed to the likely large intrinsic free volume of SPAEKs created by the highly twisted chain structures and the desirable microscopic morphology. Along with the remarkable water affinity, thermal stabilities and mechanical properties, the SPAEKs were demonstrated to be promising proton exchange membrane (PEM) candidates for potential membrane separations.Keywords:proton exchange membranes;condensation polymerization;post-sulfonation;binaphthyl;film-forming capability
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Chunyu Ru,Yiyang Gu,Zhenhua Li,Yuting Duan,Zhuang Zhuang,Hui Na,Chengji Zhao
Recently, sulfonated poly(ether ether ketone) (SPEEK) has been used as the humidity sensing material due to its simple processing, environmental stability, and large humidity responding range. However, intrinsic shortcomings such as large hysteresis and lags in response restrict its practical application. Thus, a novel bifunctional metal–organic–framework, MNS (abbreviation for MIL-101-NH 2 -SO 3 H) was prepared as an inorganic nano-filler to improve sensing properties of humidity sensor based on SPEEK, especially small hysteresis. Humidity sensitive properties of sensors were investigated by measuring the complex impedance spectra of sensors at different relative humidity (RH). The organic-inorganic humidity sensor based on the composite material (SPEEK/MNS-30%) showed the best sensing properties, such as quick response (absorption: 9 s) and small hysteresis (<3% RH, almost eighth of SPEEK sensor). Besides, the mechanism of the enhancement caused by MNS was proposed and proved by investigating the surface structure and microstructure of humidity sensing film via scanning electron microscopy and transmission electron microscopy , respectively. In addition, the equivalent circuit was built up by complex impedance spectra to study the sensing behavior of the composite humidity sensor. The good reproducibility and stability of the humidity sensor fabricated by SPEEK/MNS-30% indicated that it had the potential to be applied for practical humidity detection .
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 44
·25201-25209
·
IF 2.936
Li-rong Nie,Hang Song,Alula Yohannes,Siwei Liang,Shun Yao
A magnetic ionic liquids (MILs)-based aqueous two-phase system (MIL-ATPs) obtained by mixing with a series of inorganic salts, which involves five cholinium MILs with the piperidinyloxy radical anion is reported for the first time. Phase diagrams for the new ATPs were experimentally determined at different temperatures (298.15–318.15 K) and the liquid–liquid equilibrium data for two-phase systems were correlated according to the empirical nonlinear expression. The effects of the types of MILs, temperature and inorganic salts on the binodal curve are discussed in detail. The MIL-ATPs coupled with HPLC-UV analysis was developed in the quantitation of berberine hydrochloride in Rhizoma coptidis. Under optimal conditions, the partition coefficient of berberine hydrochloride was 127.68 with the precision values (RSD%) of 1.40% and 2.83% for intra-day (n = 6) and inter-day (n = 3), respectively. The limit of detection (LOD) and limit of quantification (LOQ) for berberine hydrochloride were 0.023 mg L−1 and 0.077 mg L−1, respectively. The recoveries were obtained in the acceptable range of 97.4–101.2%. Moreover, the content of berberine hydrochloride in the raw material of Rhizoma coptidis was measured as 123.95 mg g−1 with this method. Finally, 99.8% MIL was recovered for cycle application after the removal of berberine hydrochloride by using D101 resin. This study provides a meaningful reference for the application of MIL-ATPs with great prospects.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2018
·Vol. 10
·期 4
·441
·
IF 2.935
Weiqiu Wen,Jianwei Guo,Xi Zhao,Xiong Li,Hongmei Yang,Jem-Kun Chen
Considering the poor compatibility and water-resistance of sulfonate flame retardants for polycarbonate (PC), an efficient S/N-based flame retardant named 1,3,5,7-tetrakis(phenyl-4-sulfonyl-melamine)adamantane (ASN) has been developed. Fire properties studies of PC/ASN blends indicate that the addition of 0.10 wt % ASN imparts a V-0 rating and a limited oxygen index (LOI) value of 30.1% to PC specimens, and ASN can suppress the heat and toxic gas release of PC composites. Additionally, PC/ASN blends are believed to be exceptional materials for outdoor PC applications due to their superior water-resistance properties. Moreover, mechanical properties were further systematically investigated, and the correlative results indicate that the tensile strength and rigidity of specimens are improved with the addition of ASN.Keywords:flame retardant;adamantane;polycarbonate;fire properties;water-resistance
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Green Energy & Environment
·
2018
·
IF 0
Wei Hui,Yan Zhou,Yan Dong,Zhi-Jun Cao,Fei-Qiang He,Min-Zhong Cai,Duan-Jian Tao
Novel superacid SO 4 H-functionalized ionic liquids (SFILs) were designed and prepared in this work. The catalytic activities of SFILs were evaluated in xylan hydrolysis and xylose dehydration to produce furfural. Combined with the results of acid strength of SFILs characterized by solid-state 31 P MAS NMR, it was found that the catalytic performance of SFILs was positively correlated to their acid strength. The superacid SFIL [Ch-SO 4 H][CF 3 SO 3 ] displayed the best catalytic performance with more than 80% yield of furfural, and it was also obviously superior to usual SO 3 H-functionalized acidic ILs, mineral liquid acids, and acidic resin Amberlyst-15 catalysts in catalytic activity under optimized conditions. In addition, the superacid SFIL [Ch-SO 4 H][CF 3 SO 3 ] could be easily separated from reaction system and reused at least five times without obvious decrease.
✓ 已验证
产品关联
DOI
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Deyang Fu,Weiru Zhi,Lihua Lv,Yi Luo,Xiaoqing Xiong,Xiaohui Kang,Wei Hou,Jun Yan,Hongjuan Zhao,Laijiu Zheng
Hydrogen sulfide (H 2 S), as the third multifunctional signaling biomolecule, it acts as a neuromodulator in the human brain and is recognized as an important gas transmitter in human physiology. The abnormal concentrations of H 2 S in human cells can result in several common diseases. Therefore, accurate, fast, and reliable methodologies are required for measuring the in vitro and in vivo concentrations of H 2 S to further investigate its function. In this study, a novel DR–SO 2 N 3 fluorescent probe containing the fluorophore Disperse Red 277 and a sulfonyl azide group was developed and exploited based on the structural characteristic of Disperse Red 277 that contains the active site easily can be attacked by HS − . Therefore, this probe featured two reaction sites that involved the reduction and Michael addition of H 2 S and exhibited rapid ratiometric fluorescence changes and high selectivity towards H 2 S with a 619-fold enhancement factor. Further, the density functional theory (DFT)/time-dependent density functional theory (TDDFT) studies are conducted to understand the photophysical properties of DR–SO 2 N 3 and the final product DRHS–SO 2 NH 2 , which makes the proposed mechanism more reasonable. Furthermore, the probe was successfully applied for the ratiometric fluorescence imaging of exogenous H 2 S in living cells.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2024
·
IF 3.7
Xuan Yan,Yucheng Liu,Zhengmeng Hou,Lina Yuan,Jun Yang,Wenxin Dong
The chemical cleaning method is the simplest approach for degreasing oil-based drilling cuttings (ODCs), with the effectiveness of the treatment relying mainly on the selection of the surfactant and the cleaning conditions. However, achieving the standard treatment of ODCs directly using conventional surfactants proves challenging. In light of this, this study introduces a synthesized and purified Gemini surfactant named DCY-1. The structure of DCY-1 was confirmed through Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) analyses. The characterization in this article encompasses the use of an interface tension meter, nanoparticle size analysis, scanning electron microscopy, and infrared oil measurement. The critical micelle concentration (CMC) of DCY-1 was determined to be 3.37 × 10–3 mol/L, with a corresponding γcmc value of 37.97 mN/m. In comparison to conventional surfactants, DCY-1 exhibited a larger micelle size of 4.52 nm, approximately 24.52% larger than that of SDS. Moreover, the residual oil rate of 3.96% achieved by DCY-1 was the lowest among the chemical cleaning experimental results. Through a single-factor experiment, the optimal cleaning ability of DCY-1 for ODCs was determined as follows: a surfactant concentration of 3 mmol/L, a temperature of 60 °C, an ODC/liquid mass ratio of 1:4, a cleaning duration of 40 min, and a stirring speed of 1000 rad/min. Under these optimal conditions and after merely two cleaning procedures, the residual oil content of ODCs was reduced to 1.64%, accompanied by a smooth and loose surface structure.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2015
·
IF 4.074
Zhangrun Han,Yangyang Zeng,Meng Zhang,Yiran Zhang,Lijuan Zhang
Chemically sulfated chitosans are important biomaterials. However, a reliable analytical method for quality control over such compounds is still lacking. In this study, we prepared four different kinds of selectively sulfated chitosans and developed a novel method to analyze their monosaccharide compositions by HPLC. In this method, nitrous acid was used to generate 2, 5-hydro mannose (M), 3-O-sulfated M (M3), 6-O-sulfated M (M6), and 3, 6-O-disulfated M (M9) from the sulfated chitosans. PMP, that is 1-phenyl-3-methyl-5-pyrazolone with a UV absorbance at 245 nm, was used to label all the Ms quantitatively. The monosaccharide compositions for each sulfated chitosan were obtained by C18 HPLC separation and online UV detection of all PMP-labeled Ms. The identities of all Ms were confirmed by MS analysis with the help of standard Ms generated from a heparin pentasaccharide and chitosan. The overall results indicated that the newly developed method had advantages over 13 C NMR in defining the monosaccharide compositions of sulfated chitosans and was useful for quality control purpose.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2015
·
IF 3.52
Xianxiang Liu,Qiong Xu,Junyi Liu,Dulin Yin,Shengpei Su,Hui Ding
An effective method was developed for the production of reducing sugars (RS) from the hydrolysis of cellulose over a magnetic acid catalyst. The sulfonation of the core–shell structured Fe 3 O 4 @C with Fe 3 O 4 as a magnetic core could generate the magnetic acid catalyst (Fe 3 O 4 @C-SO 3 H). The hydrolysis of cellulose was performed under several crucial conditions. Hydrolysis of cellulose in ionic liquid 1-butyl-3-methyl imidazolium chloride ([BMIM]Cl) was greatly affected by the content of water. The highest RS yield and glucose selectivity were obtained in 72.1% and 82.5% at 110 °C after 3 h with the weight ratio of [BMIM]Cl to water being 20. It should be mentioned that this catalyst not only owns the high stability but also can be facile recovered by an external magnet.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）