Analytical Methods
·
2012
·Vol. 5
·期 2
·536-540
·
IF 1.547
Jianfei Xiong,Xiangyu Tang,Guangming Zhou,Zhuo Guan,Limin Wu
A simple method was proposed for simultaneous determination of chlorpyrifos and its hydrolysis and biodegradation product 3,5,6-trichloro-2-pyridinol (TCP) in soil samples. The analytes were extracted with ethyl acetate (EtOAc) under optimized pretreatment conditions such as the type, volume and pH of extraction solvent. Clean-up of the extract from soil was conducted by dispersive solid phase extraction (DSPE) using activated carbon as the adsorbent. High performance liquid chromatography with ultraviolet detection (HPLC-UV) was used for simultaneous determination of the two analytes. Under the optimized HPLC conditions, the limits of detection (LOD), obtained on signal-to-noise ratio (S/N) of 3, for chlorpyrifos and TCP were 0.0080 mg kg−1 and 0.0120 mg kg−1, respectively. Linear calibration curves were obtained in the range of 0.05–2.00 mg kg−1 and 0.03–2.00 mg kg−1 for chlorpyrifos and TCP, respectively. The spike recoveries from soil ranged from 89.4% to 114%, and the relative standard deviation (RSD) was in the range of 0.80%–14%.
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OPTICAL MATERIALS
·
2014
·
IF 2.075
Quntao Tang,Honglie Shen,Jing Jiao,Weilong Chen
ZnO:Er, Li light conversion film has been successfully fabricated by sol–gel method. XRD measurement demonstrated the successful incorporation of Er 3+ and Li + into ZnO films. The as-grown film co-doped with 2% Er 3+ and 3% Li + is featured with a transmittance of about 86.8% in the range of 400–900 nm. Moreover, the film exhibits a visible light emission either being excited by 355 nm or 980 nm. Due to its relatively high transmittance characteristics and promising properties of converting both UV and NIR light to visible light, the developed film is considered to have a potential application in novel light conversion devices including solar cells.
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BIOMEDICAL CHROMATOGRAPHY
·
2014
·Vol. 28
·期 10
·1325-1334
·
IF 1.662
Zhangxiao Peng,Yan Wang,Xue Gu,Xiaojie Guo,Chao Yan
A method based on high-performance liquid chromatography coupled with ultraviolet detection was developed for studying the pharmacokinetics of costunolide (Cos) and dehydrocostus lactone (Dehy) in rats after intravenous (i.v.) administration. Following i.v. administration, the maximum plasma concentrations of Cos and Dehy were observed to be 12.29 ± 1.47 and 5.79 ± 0.13 µg/mL, respectively. The bioavailability of Cos was larger than that of Dehy; however, the clearance and the volume of distribution of Dehy were much larger than those of Cos. An ultraperformance liquid chromatography/quadrupole time-of-flight mass spectrometry system with automated MS E (E represents collision energy) data analysis software (MetaboLynx TM ) was used to analyze and identify the metabolites of Cos and Dehy in vivo . Four metabolites of Cos and six metabolites of Dehy were discovered from the plasma, urine and feces of rats. The main metabolic pathway of Cos was phase II biotransformation, but the main metabolic pathways of Dehy was phase І biotransformation. Two sequential desaturations and N -acetylcysteine conjugation were the common metabolic pathways of Cos and Dehy in rats. This information may be useful for the further development of the two drug candidates. Copyright © 2014 John Wiley & Sons, Ltd.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2017
·Vol. 23
·期 54
·13518-13524
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IF 5.317
Enguo Ju,Kai Dong,Zhenzhen Wang,Yan Zhang,Fangfang Cao,Zhaowei Chen,Fang Pu,Jinsong Ren,Xiaogang Qu
Graphical Confine and eliminate : The integration of ZnO nanoparticles and CeO x nanoparticles into hollow microspheres (ZnO/CeO x HMS) could provide broad-spectrum UV protection and scavenge reactive oxygen species (ROS) generated under UV irradiation (see figure). Benefiting from the cooperative effect of the hollow structure and the antioxidative enzyme mimicking activity of CeO x , the generated ROS could be confined to the limited space and effectively scavenged. Skin cancers caused by UV irradiation have been a major public health problem. One simple and effective way to avoid the above detrimental effects is the use of UV-protective sunscreens. However, there has been considerable concern with the issue of the production of reactive oxygen species (ROS) through the photodegradation of commercial UV filters. Herein, for the first time, it is reported that the integration of ZnO nanoparticles and CeO x nanoparticles into hollow microspheres (ZnO/CeO x HMS) could provide broad-spectrum UV protection and scavenge generated ROS under UV irradiation. Benefiting from the cooperative effect of the hollow structure and the antioxidative activity of CeO x , ROS generated under UV irradiation could be confined to a limited space and effectively conversion into nontoxic molecules is catalyzed as a consequence of increased collision frequency. Therefore, both primary, direct UV-induced damage and secondary ROS toxicity could be greatly reduced.
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RSC Advances
·
2017
·Vol. 7
·期 22
·13552-13560
·
IF 3.108
Xiaomei Lu,Jie Tang,Xinxin Dang,Xiaoli Jing,Kailin Xu,Hui Li,Bing Liang
A simple approach is proposed for the chiral recognition and determination of enantiomeric excess of enantiomers, based on a UV-visible-shortwave near infrared diffuse reflectance spectroscopy (UV-vis-SWNIR DRS) technique combined with chemometrics. The results of chiral recognition show that principal component analysis (PCA) combined with UV-vis-SWNIR DRS is able to discriminate chiral compounds based on different chirality. Determination of enantiomeric excess value was performed by linear regression model partial least squares (PLSR) and non-linear regression model support vector machine regression (SVR) combined with UV-vis-SWNIR diffuse reflectance spectroscopy. After wavelength selection, spectral pre-treatments and parameter optimization, both models showed good prediction ability: the determination coefficients (R2) of prediction set by the PLSR model and the SVR model are 0.9921 and 0.9951, respectively, and mean standard errors (MSEs) are 0.0029 and 0.0020, respectively. The SVR model has a better prediction effect. The detection limit (LD) of this method was 0.059. The results prove that this approach can be used to discriminate chiral compounds and determine enantiomeric excess of enantiomers.
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ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Binbin Shao,Chenkai Hu,Hainan Zhao,Chengcheng Xiao,Erdeng Du,Anhong Cai,Jing Deng
Ambroxol (AMB) is a commonly used bromine-containing organic compound in medical applications and has been frequently found in water environments, which might pose risks of forming brominated disinfection by-products (Br-DBPs) in water treatment systems. The degradation kinetics as well as the degradation mechanism of AMB in the UV/chloramine process were investigated in this study. It was determined that reactive chlorine species (RCS) and the reactive nitrogen species (RNS) were the dominant free radicals for AMB degradation. Debromination occurred mainly in the initial stage of the degradation process, with a debromination rate of 34.5% at 10 min. Four possible degradation pathways of AMB were proposed based on liquid chromatography mass spectrometry (LC-MS) analysis as well as density functional theory (DFT) calculations, meanwhile the ECOSAR model was used to predict the toxicity risk of AMB and its degradation intermediates. Furthermore, after assessing the formation of DBPs during the UV/chloramine pre-oxidation process and conducting a toxicity risk analysis based on the results, it has been verified that this method can effectively remove AMB while reducing the formation potential of DBPs in the water environment. This suggests that the UV/chloramine process shows promise for treating bromine-containing organic compounds in real-world water treatment applications.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Guangjian Dai,Shengtao Zhang,Wenjie Yang,Chunxiang Wei,SanE Zhu,Zhongxing Geng,Eric W. M. Lee,Hongdian Lu,Bin Yu,Wei Yang
The exploration of biomass-derived thermosetting resins for implementation in flexible electronic packaging has emerged as a central focus. Herein, a daidzein-derived monomer (DDAB) was synthesized, which featured carbon–carbon double bonds. Biobased resins, namely, DDAB/3SH and DDAB/4SH, were meticulously fabricated via photocuring process, entailing the amalgamation of DDAB with trithiol (TPTMP) and tetrathiol (PETMP) monomers, respectively. DDAB/4SH showed impressive mechanical properties with a tensile strength of 28.1 MPa and elongation at break of 21.3%. Notably, owing to the augmented free volume inherent within the system, DDAB/3SH exhibited an exceptional elongation at a break of 111.7%, thereby surpassing the performance metrics of the majority of previously documented thiol-containing compounds. Moreover, both DDAB/3SH and DDAB/4SH demonstrated desirable dielectric properties. Specifically, within the frequency range of 15–16 GHz, DDAB/3SH achieved a minimum dielectric constant of 2.58. The exceptional dielectric performance, coupled with the tunable mechanical properties, proves the substantial application potential of DDAB/SH biomass-derived resins for flexible electronic packaging applications.
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Yun Dou,Elwathig A.M. Hassan,Shoujuan Wang,Magdi E. Gibril,Fangong Kong
In contemporary agriculture, eco-friendly mulching films present a promising alternative to conventional plastic mulching films. However, their potential is constrained by challenges related to limited biodegradation and barrier performance. Addressing these limitations, innovative lignin-carboxylated materials were employed as bio-based crosslinking agents to enhance diverse properties in the fabrication of PVA films. Alkali lignin was modified with diethylenetriaminepentaacetic acid (DTPA) to enhance its chemical reactivity. The abundance of carbonyl groups in modified lignin (Lig-DTPA) plays a significant role in establishing strong compatibility with PVA through covalent bonds. This interaction yielded remarkable enhancements, elevating both tensile strength and tensile modulus by an impressive 50.9 % and 60.1 %, respectively. The introduction of Lig-DTPA at 3 % into the PVA composite films resulted in excellent UV-blocking properties. Moreover, at 3 % ratios, the presence of lignin became visibly dispersed as clear spots across the film, indicating a relatively uniform state within the matrix. The study revealed a direct correlation: as the lignin content increased, the film exhibited heightened water solubility and enhanced biodegradability. The PVA/Lig-DTPA film displays promising potential for utilization as a mulching film material, offering anti-ultraviolet functionality and a high degradation rate. Furthermore, its versatility extends to potential applications in packaging materials, including seedling bowls, transplanting pots, and coating films for transportation purposes.
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eFood
·
2024
·Vol. 5
·期 3
·e147
·
IF 4
Biyang Zhu,Liuting Li,Kseniya Hileuskaya,Baojun Xu,Lijun You
Although ultraviolet (UV)/H 2 O 2 treatment could effectively improve the bioactivities of polysaccharides, the relationship between free radical-induced structural changes and the bioactivities of products remains unknown. Therefore, this work investigated the changes in the chemical characteristics and chain conformations of degraded dextrans by the UV/H 2 O 2 system as well as their antioxidant and anti-inflammatory activities. The apparent degradation efficiencies of dextrans under different UV/H 2 O 2 parameters were first investigated. UV/H 2 O 2 treatment effectively destroyed the pyranose rings and glycosidic bonds of dextrans and significantly improved their uronic acid and carboxy contents. Furthermore, conformational studies revealed that besides the rapid decrease in the molecular weight, the compact spherical conformation of dextrans was gradually depolymerized into the flexible random coil conformation. Moreover, the significant antioxidant and anti-inflammatory activities of the degraded dextrans were mainly attributed to their more extended random coil chains, increased quantity of reducing groups, and lower molecular sizes. This study contributes to investigating the structure–activity relationship of polysaccharides prepared by free radicals-mediated degradation.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Xingyu Kang,Jianhui Lv,Lei Han,Bin Huang,Huizhang Zhao,Dong Wang,Hairui Fang
Nitrogen oxide (NO 2 ) is common by-products of industrial production, posing significant health risks to workers. Therefore, real-time monitoring of NO 2 is crucial. In this study, innovative In 2 O 3 -ZnO nano-materials were prepared by combining In 2 O 3 with ZIF-8 via electrospinning, for detecting trace amounts of NO 2 at room temperature (RT). Compared to pure In 2 O 3 , the In 2 O 3 -ZnO nano-materials (V2) with a 10 % weight ratio of ZIF-8 exhibited a significantly higher response (389.99) and a faster response time (16.9 s) to NO 2 under ultraviolet (UV) irradiation at RT. The superior gas sensing performance of the V2 nano-materials is attributed to the formation of n-n heterojunctions, enhanced optical absorption, increased oxygen vacancy ratio, and excellent dispersion among the nano-materials. The results demonstrate that V2 nano-materials can detect NO 2 at parts-per-billion (ppb) levels at RT, making them suitable for monitoring trace amounts of NO 2 in open environments. Furthermore, a portable real-time NO 2 monitoring device was constructed using V2 as the sensing material, an LM358-based amplifier circuit for data acquisition, an STM32F103C8T6 microcontroller as the main control unit, and a buzzer as an alarm device. Compared to devices using a helical Ni-Cr wire as an indirect heat source, this integrated NO 2 detection device offers real-time alarms with lower energy consumption. This application not only enhances worker health and safety in industrial environments but also demonstrates higher energy efficiency in practical application.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Mingyin Zhang,Qifan Zhang,Dongjie Zhang,Zhenhuan Tian,Qiang Li,Feng Yun
A versatile surface-enhanced Raman spectroscopy (SERS) substrate capable of responding to excitation by both visible and ultraviolet (UV) lasers is challenging. Herein, an ultrasensitive and long-term stable SERS substrate suitable for both visible and UV excitation is realized by a structure of hexagonal boron nitride (hBN) nanosheet film-veiled Ag nanoparticles (hBN/Ag substrate). Utilizing the hBN/Ag substrate, the detection limit for crystal violet (CV) under a 532 nm laser is remarkably low at 1.0 × 10 -15 M; adenine, a biomarker, can be detected under UV excitation (a 325 nm laser) with a low limit of 1.0 × 10 -7 M. The hBN/Ag substrate provides abundant electromagnetic (EM) hotspots and multiple charge transfer paths under both 532 nm and 325 nm lasers. This cooperation of EM and chemical enhancement confers ultrasensitive and versatile SERS performance to the substrate. Furthermore, the hBN/Ag substrate demonstrates excellent reproducibility and stability even after 6 months in air, maintaining the SERS intensity of CV at over 86 % of that on the freshly prepared substrate, with a relative standard deviation of 6.57 %. These results indicate that the hBN/Ag substrate can be employed in visible and UV SERS for widespread and practical applications.
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Materials
·
2024
·Vol. 17
·期 15
·3734
·
IF 3.1
Yuyang Zhou,Peng Deng,Wei Chen
There is a significant trend towards the integration of natural substances with bio-polymers for fully bio-based functional composites. Polylactic acid is regarded as a promising biodegradable polymer for replacing synthetic polymers. Differing from the case of natural fiber, the incompatibility of polylactic acid with bio-based molecules prevents it from being used to fabricate high-quality sustainable composites. This work presents a simultaneous ultraviolet shielding and antibacterial finishing process of polylactic acid combined with bioactive baicalin and an eco-friendly ester, which is highlighted for (a) the lack of synthetic chemicals involved in such process, (b) adsorption enhancement achieved at a mild temperature, and (c) marginal color change on treated polylactic acid. A response surface methodology was adopted to analyze the impacts of various factors on the baicalin quantity in polylactic acid, and to optimize the treatment condition. The uptake ratio of baicalin in polylactic acid was drastically promoted from 8.5 mg/g to 21.1 mg/g using methyl cinnamate. The response surface methodology based on a central composite design experiment indicated that the usage of baicalin was the most significant factor followed by methyl cinnamate and temperature. After optimization, a very faint color depth of 1.2 was apparent, but UPF 50+ and 92% bacterial reduction could be achieved. In all, the success in strengthening of the functionalities of polylactic acid extends the applications of polylactic acid products.
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