Analytical Methods
·
2018
·Vol. 10
·期 11
·1325-1330
·
IF 2.073
Yong Zhang,Zhizhong Zou,Guixing Chou
To quickly determine the amounts of kirenol, darutoside and darutigenol in Herba Siegesbeckiae using HPLC, the efficiency of sample cleanup with different solid phase extraction methods was systematically investigated. The results showed that a polymer based strong anion exchange (P-SAX, 200 mg/6 mL) sorbent could separate and enrich diterpenoids providing rapid determination without impurity interference. In this paper a new HPLC-UV method using a core–shell column (Boltimate C18 3.0 × 100 mm, 2.7 μm) for the quantitative determination of three diterpenoids was developed. Under optimum experimental conditions, P-SAX pretreatment with a core–shell analytical column exhibited satisfactory results in the determination of diterpenoids in Herba Siegesbeckiae with recovery rates of 95–102%, relative standard deviations below 1.1%, a limit of quantitation as low as 0.1 6 μg mL−1, and a short analytical runtime of 8 min. Finally, the proposed method was successfully applied in the profiling of diterpenoids in Herba Siegesbeckiae from different regions.
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Water Reuse
·
2024
·Vol. 14
·期 3
·342-354
·
IF 4.3
Liu Z.,Xu M. Y.,Yin H.,Xie C. W.,Liu Q.,Liu H. T.,Liang S. Y.,Li J. K.,Zhang T. Y.,Li T.,Hu H. Y.,Xu B.
Membrane fouling is a prominent issue that affects the stable and efficient operation of reverse osmosis (RO) in reused water treatment. In this study, a zero-discharge RO system was adopted to treat the ultrafiltration permeate from a steel plant with the combined multi-wavelength UV-LED/chlorine process, focusing on organic structure modification and membrane fouling control. The results showed that the UV-LED/chlorine process could not only efficiently remove the dissolved organic carbon and the total nitrogen of the RO influent but also alter the organic substances from large molecules to small ones. In addition, the longer wavelength of a 295 nm UV-LED/chlorine process exhibited a greater RO permeate flux of 158 LMH, as compared to the shorter wavelength of 255 nm with the flux of 152 LMH. Moreover, compared to the single-wavelength, the dual-wavelength UV-LED/chlorine process played a more significant role in RO filtration performance, which induced a looser and thinner foulant structure, resulting in an 8% larger permeate flux and recovery at 275 + 295 nm than at 295 nm. This study demonstrated that the combined UV-LED/chlorine process could effectively alleviate RO membrane fouling. Our findings can provide theoretical and technical support for the sustainable development of membrane-based reused water treatment in the steel industry. Multi-wavelength UV-LED/chlorine process was effective for the pretreatment of RO for steel reused water treatment. UV-LED/chlorine process could oxidize organics to enhance RO filtration. Longer wavelength UV-LED/chlorine process was more favorable for organics removal and RO fouling control. Dual-wavelength UV-LED/chlorine pretreatment can induce less RO membrane fouling as compared to single wavelength.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2017
·
IF 2.603
Xiao Zhao,Youfa Xu,Lifang Zhang,Chunmei Wang,Chunna Guo,Chenzhong Fei,Keyu Zhang,Xiaoyang Wang,Yingchun Liu,Mi Wang,Wenli Zheng,Feiqun Xue
Ethanamizuril (EZL) is a novel anti-coccidial triazine synthesized by the Shanghai Veterinary Research Institute of the Chinese Academy of Agricultural Sciences. As a novel coccidiostat, it is essential to study its residue in food animal tissues. In this study, a reliable UPLC method for the determination of ethanamizuril (EZL) and one of its metabolites (M3) in chicken muscle, skin and fat, liver, and kidney samples was developed. Analytes were extracted using acetonitrile and 10% sodium carbonate solution, defatted by n -hexane, and further purified by using an Oasis MCX cartridge. The calibration curves for both test compounds were linear in all tissue matrices we tested: muscle, skin and fat, liver and kidney. The mean relative recoveries of EZL and M3 were from 87.3% to 103.2% between all tissue samples. The inter-day and intra-day relative standard deviations were within 15% and 20%, respectively. This method is accurate, reproducible and is ready to be field-tested.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Cheng-Zhen Nie,Liang Wang,He-He Tian,Xu-Hui Huang,Lei Qin
This study aimed to investigate the effects of ultrasound-assisted curing and UV-assisted drying on the quality of semi-dried tilapia fillets through flavoromics, lipidomics, and metabolomics. Both treatments enhanced myofibril pore space and reduced moisture content (−14.84 %, P < 0.05), with ultrasound demonstrating greater effectiveness. Additionally, they also facilitated lipid oxidation ( P < 0.05), which altered the flavor profile. UV treatment enhancing key aroma compounds (ROAV >1), especially octanal, 1-octen-3-one, ethyl-isovalerate, and 2-pentyl-furan, more effectively than ultrasound ( P < 0.05). 420 lipid molecules and 213 metabolites were identified, including 162 differential lipids and 69 differential metabolites (VIP > 1). Correlation analysis indicated that triglycerides, fatty acids, organic acids, and nucleosides were key precursors of flavor. The sensory evaluation demonstrated that ultrasound and UV treatments synergistically enhanced fillet quality. This study introduces an innovative processing method aimed at the industrialized and efficient production of high-quality air-dried aquatic products.
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POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Yanlu Sun,Shuo Fan,Xiulin Li,Xubin Wang,Dequn Wu,Xueli Wang,Jianyong Yu,Ruchao Yuan,Faxue Li
The limited carbon layer formation during combustion causes severe melt droplet formation and excessive heat release in polyamide 6 (PA6) filaments, hindering their application in textiles. In this work, phosphorus-containing transition metal complexes PAPH-M (M = Co, Ni, Zn) were synthesized by combining 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) with high oxidation state phosphorus and transition metal elements to enhance the carbonization effect of flame retardants in the PA6 matrix during combustion. By incorporating 10 wt% PAPH-Co into the PA6 matrix (PA6/PAPH-Co), a UL94 V-0 rating was achieved with no melt droplet. The peak of heat release rate (p-HRR) and total heat release (THR) of PA6/PAPH-Co decreased to 623 kW·m -2 and 56.8 MJ·m -2 , exhibiting reductions of 41.5% and 36.0%, respectively, compared to pure PA6. The exceptional flame retardancy, heat suppression and anti-dripping behaviors of PA6/PAPH-M composites were attributed to the quenching effect and barrier effect. Additionally, PA6/PAPH-M composites demonstrated exceptional UV-blocking capabilities, with ultraviolet protection factor (UPF) values of around 1900 compared to 3 for pure PA6. Melt-spun PA6/PAPH-Co filaments self-extinguished within 2 s in vertical burning tests and maintained sufficient mechanical strength for textile processing, confirming their sustained comprehensive performance post-spinning.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Shangke Liu,Ziming Yu,Liping Su,Panyi Hu,Youxiang Ren,Shiyu Liu,Haitao Ding,Shiqian Qi,Mengchang Yang,Min Zhang,Xiaohe Tian
Mitochondrial structural remodeling under oxidative stress is central to the pathogenesis of skin photoaging. Here, we report Mito-Py, a robust mitochondria-targeted probe with a special functional donor-π-acceptor (D-π-A) configuration. Featuring a large Stokes shift (∼130 nm) for minimal self-absorption and viscosity-sensitive emission via a twisted intramolecular charge transfer (TICT) mechanism, Mito-Py enables real-time mapping of mitochondrial viscosity fluctuations during UV-induced oxidative stress in HaCaT keratinocytes. Unlike membrane-potential-dependent dyes, Mito-Py achieves membrane-potential-independent mitochondrial retention, ensuring stable suborganellar localization even during depolarization events. Its exceptional resistance to photobleaching permits super-resolution structured illumination microscopy (SIM) to resolve UV-induced cristae fragmentation with ultrahigh spatial precision (sub-100 nm). Beyond cellular models, Mito-Py was applied to paraffin-embedded skin sections from a UV-induced murine photoaging model, where staining revealed markedly stronger fluorescence in photoaged skin compared to normal skin. These results underscore Mito-Py’s capability to detect mitochondrial alterations in complex tissue environments, providing a powerful, photostable tool for dissecting mitochondrial stress responses and exploring organelle crosstalk in photoaging and related dermatological disorders.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Zhengtao Zhu,Xi Deng,Yongqiang Ye,Na He,Bihe Yuan,Fei Xiao,Kaiyuan Li
To address the challenge of balancing fire safety and mechanical properties in thermoplastic polyurethanes (TPU), this study developed a CP@MIL-101 hybrid by confining liquid cyclic phosphates within the pore structure of MIL-101 using a hierarchical design strategy. The results demonstrated that the introduction of CP@MIL-101 slightly improved the thermal stability of TPU. Notably, the residual char yield increased significantly from 0.1 % to 9.3 % with only 0.5 % loading. With just 2 wt% loading of CP@MIL-101, the TPU composite achieved a UL-94 V-0 rating (3 mm) and exhibited a 20.4 % increase in the limiting oxygen index (LOI), reaching 26.0 %. Furthermore, significant reductions in peak heat release rate, total heat release, and fire growth rate index were observed, indicating enhanced fire safety of the TPU composites. Characterization analyses suggested that the improved fire retardancy resulted from the synergistic effects of MIL-101 and cyclic phosphates in both the condensed and gas phases, through the formation of a protective char layer and free radical quenching. Additionally, incorporating 2 wt% CP@MIL-101 endowed the TPU matrix with exceptional ultraviolet shielding properties due to unique electron transitions absorption. Simultaneously, the tensile strength of the TPU increased by 15.85 % compared to neat TPU, demonstrating mechanical reinforcement. This work establishes a strategic approach for developing multifunctional flame retardants and fire-safe TPU composites, paving the way for their application in high fire-safety environments.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 5
·1-12
·
IF 5.3
Li Weixia,Lei Jiacheng,He Tiancheng,Gan Yaping,Zhu Yan
A novel Zr-based metal–organic framework (MOF) functionalized with graphene oxide-coated allylmethacrylate-divinylbenzene microspheres (AMA/DVB@GO), termed AMA/DVB@GO@UiO-66-NH 2 was designed. The composite exhibits great adsorption capacity and selectivity for bisphenols (BPs), driven by synergistic interactions, including hydrophobic, π-π, and hydrogen bonding. We optimized conditions to establish an efficient dispersive micro-solid phase extraction procedure coupled with high-performance liquid chromatography (d-μSPE-HPLC) for extracting BPs from milk samples, using the AMA/DVB@GO@UiO-66-NH 2 composite. The method achieved recoveries ranging from 84.0 to 106.6%, with relative standard deviations below 6.9% and detection limits between 0.17 and 0.67 μg/L. This study introduced a novel, hydrophilic, and stable AMA/DVB@GO@UiO-66-NH 2 composite, offering a promising material for the selective enrichment and detection of BPs in food analysis. Graphical
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Systems Microbiology and Biomanufacturing
·
2025
·
IF 2.9
Shi Yu,Li Huifan,Lu Yuqi,Chen Ming,Yang Hua,Fu Dongmei
A simple and robust reversed-phase high performance liquid chromatography procedure was developed with only an aqueous H 3 PO 4 solution (pH 2.1) as the mobile phase for the simultaneous determination of nine organic acids (oxalic, formic, malic, lactic, acetic, citric, succinic, fumaric, and gallic acids) in beer based on a polar-copolymerized 3-chloropropyl C18 column. The proposed method was validated according to linearity, limits of detection, accuracy, precision, repeatability, and reproducibility. Quantifications of the nine organic acids in 12 commercial Chinese beer samples from five different brands were conducted only after degassing and filtration of the samples. In all beer samples, the most abundant organic acid was succinic acid; its concentration was in the range of 907.99–3557.22 mg/L. This was followed by malic acid (170.39–936.78 mg/L). Principal component analysis was used to compare the different brand of beers according to organic acid concentration, and results may provide a reference for the evaluation of beer quality and taste.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xingxing Huang,Yujie Ao,Haocheng Yang,Muyu Feng,Xuan Wang,Rui Chen,Qing Yang,Jinsuo Lu
With the rapid development of modern water treatment technologies, public perception of drinking water has shifted from simply ‘having water to drink’ to ‘drinking healthy water’. Despite the ability of modern water treatment plants to remove most pollutants, the presence of excess disinfection by-products (DBPs) in tap water is a major issue. Boiling is amongst of the oldest methods for purifying drinking water, and > 90 % of Chinese households still consume boiled water. This study proposes an enhanced photoelectrochemical–thermal synchronised technology (E-UV/BO) to address the issue of excess DBPs in tap water. The study shows that boiling can effectively remove volatile DBPs, such as trihalomethanes, with removal rates reaching 60 %–80 %, but the removal of haloacetic acids and aromatic DBPs was < 10 %. In contrast, the E-UV/BO technology achieves a removal efficiency of > 70 % for all DBPs, even with complete elimination. This enhancement in the removal efficiency can be attributed to the improved catalyst performance, reduced solution resistance, accelerated molecular motion and decreased intermolecular forces. FT-ICR MS confirmed that the E-UV/BO significantly simplified the molecular composition of dissolved organic matter and effectively removed halogenated and aromatic DBP precursors. For a family of four consuming 10 L of water per day, the daily power consumption of this small-scale device based on E-UV/BO is only 0.5–0.8 kWh. This technology not only offers a new approach to improving the quality of drinking water but also reduces the treatment burden on upstream water treatment plants, contributing to global efforts to ensure drinking water safety.
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Current Analytical Chemistry
·
2024
·Vol. 21
·期 2
·124-133
·
IF 1.7
Zhengming Qian,Zhuobin He,Dongyin Lian,Qi Huang,Guoying Tan,Juying Xie
BackgroundFlavonoid is a type of active constituent in herbs and always used as the quality control markers of herbal medicines. Owing to the extensive diversity of flavonoids, numerous reference compounds are necessitated for the analysis of flavonoids, and some are usually very expensive, which engenders challenges in the analysis of flavonoids in herbal medicines. Consequently, the development of a simple, rapid, and reference compounds saving method is important for the determination of flavonoids in herbal medicines.ObjectiveIn order to develop a high-performance liquid chromatography (HPLC) method for the determination of 5 flavonoids (mangiferin, hesperidin, baicalin, buddleoside, and rutin) in five herbal medicines (Anemarrhenae rhizome, Sophorae flos, Citri reticulatae pericarpium, Scutellariae radix, and Chrysanthemi indici flos) with rutin.MethodsFive herbal medicine samples were prepared according to the Chinese Pharmacopoeia which includes ultrasound and reflux methods. The separation of the sample was performed on a PoroShell 120 EC-C18 (4.6 mm×100 mm, 2.7 μm) by gradient elution with 0.1% formic acid and acetonitrile at a flow rate of 1.0 mL/min. The wavelengths were set as follows: Anemarrhenae rhizome (363 nm), Sophorae flos (256 nm), Citri reticulatae pericarpium (236 nm), Scutellariae radix (263 nm), Chrysanthemi indici flos (354 nm).ResultsThe method validation showed that the established HPLC method was accurate and stable for quantitative analysis of flavonoids in five herbal medicines. The comparative analysis revealed that the determination results of the current HPLC method and Chinese Pharmacopoeia method are consistent, exhibiting less than 1% relative error. Remarkably, the developed HPLC method needs one cheapest reference compound (rutin) and costs 8 min for sample HPLC analysis.ConclusionThe developed HPLC method for quantitative analysis of five flavonoids in five herbal medicines is simple, rapid, and reference compound saving, which provides a good alternative method for quality control of flavonoids in herbal medicines.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Bo Tang,Yuanzhe Dai,Yunfei Sun,Haiqun Chen,Zhengwei Wang
Various metal organic frameworks (MOFs) including ZIF-8, Uio-66 and Cu-BTC are prepared and adopted with reduced graphene oxide (RGO) to co-modify TiO 2 . The resulting composite photocatalysts display high photocatalytic performances under both UV- and visible-light irradiation, and the corresponding photocatalytic mechanisms are revealed by considering the electronic structures and morphologies of these ingredients, which are proven by IR curves, STM patterns, lifetime of photoinduced electrons. The influences of BET areas and pore diameters of the adopted MOFs on the resulting photocatalytic properties are studied, and the specific influence of interaction between TiO 2 and RGO on the observed photocatalytic activities are also discussed. The large BET areas of the MOFs endow high adsorption capacities to the resulting photocatalysts, while the closely chemical contact between TiO 2 and RGO achieves the visible-light activity. After optimization, the degradation rate constants of rhodamine-B reach 1.65 × 10 -1 min -1 and 1.12 × 10 -1 min -1 under UV- and visible-light irradiation, respectively.
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