DYES AND PIGMENTS
·
2018
·
IF 3.767
Li–Li Chang,Qiang Gao,Shu Liu,Ce–Ce Hu,Wen–Jun Zhou,Ming–Ming Zheng
A new multiple-ion-responsive chemosensor was developed for the selective and differential detection of Hg 2+ and Cu 2+ , based on the completely different ions recognition behaviors of the single rhodamine hydrazone-type probe in the absence and presence of UV irradiation. The probe was synthesized through simple chemical linkages of rhodamine B hydrazide, 4-hydroxybenzaldehyde, and acryloyl group. In the absence of UV irradiation, this probe could selectively sense Hg 2+ in the presence of other metal ions by colorimetric and fluorescent responses with considerably high sensitivity (limit of detection: 7.1 × 10 −8 M), and the process could be monitored directly by the naked eye. Intriguingly, when adding various metal ions to the probe solution under UV irradiation, only the Cu 2+ ion, even at a concentration of 1.5 × 10 −7 M, was found to induce a significant photochromism along with distinct color change. Benefiting from the high selectivity and sensitivity of such a photochromism, a convenient colorimetric sensing method for detection of Cu 2+ in presence of UV irradiation was also established. Furthermore, we demonstrated that the interference of Hg 2+ on Cu 2+ could be easily eliminated by employing Br − as a masking agent, and subsequently the discrimination of Hg 2+ and Cu 2+ under their coexistence was achieved.
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高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2017
·Vol. 41
·期 7
·1635-1643
·
IF 2.557
Dandan Ge,Yi Zhang,Yixiu Dai,Shumin Yang
Deep eutectic solvents are considered as new and green solvents that can be widely used in analytical chemistry such as microextraction. In the present work, a new dl- menthol-based hydrophobic deep eutectic solvent was synthesized and used as extraction solvents in an air-assisted dispersive liquid–liquid microextraction method for preconcentration and extraction of benzophenone-type UV filters from aqueous samples followed by high-performance liquid chromatography with diode array detection. In an experiment, the deep eutectic solvent formed by dl- menthol and decanoic acid was added to an aqueous solution containing the UV filters, and then the mixture was sucked up and injected five times by using a glass syringe, and a cloudy state was achieved. After extraction, the solution was centrifuged and the upper phase was subjected to high-performance liquid chromatography for analysis. Various parameters such as the type and volume of the deep eutectic solvent, number of pulling, and pushing cycles, solution pH and salt concentration were investigated and optimized. Under the optimum conditions, the developed method exhibited low limits of detection and limits of quantitation, good linearity, and precision. Finally, the proposed method was successfully applied to determine the benzophenone-type filters in environmental water samples with relative recoveries of 88.8–105.9%.
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PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Chenyu Zeng,Yongfei Ma,Ping Li,Xi Chen,Hongtao Liu,Zhikang Deng,Rui Mu,Xuebin Qi,Zulin Zhang
A novel UV/oxalic acid functionalized corn straw biochar (OCBC)/peroxyacetic acid (PAA) system was built to degrade sulfadiazine from waters. 94.7 % of SDZ was removed within 30 min by UV/OCBC/PAA. The abundant surface functional groups and persistent free radicals (PFRs) on OCBC were responsible for these performances. Cyclic voltammetry (CV) and other characterization analysis revealed, under UV irradiation, the addition of OCBC served as electron donor, which might promote the reaction of electrons with PAA. The quenching and electron paramagnetic resonance (EPR) tests indicated that R-O•, 1 O 2 and •OH were generated. Theoretical calculations indicated sulfonamide bridge was vulnerable under the attacks of reactive species. In addition, high removal effect achieved by 5 reuse cycles and different real waters also suggested the sustainability of UV/OCBC/PAA. Overall, this study provided a feasible approach to remove SDZ with high mineralization efficiency, in addition to a potential strategy for resource utilization of corn straw.
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PubMed
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Hao-Nan Wei,Xin-Yue Liu,Chen-Chen Wang,Ran Feng,Bao Zhang
With the aim of effectively improving the performance of bio-friendly food packaging and circumventing the hazards associated with petroleum-based plastic food packaging, composite films of corn starch and polyvinyl alcohol were prepared using a new method that involved chemical cross-linking of glutaraldehyde and blending with cinnamon essential oil nanoemulsion (CNE). Glutaraldehyde and CNE enhance the film's network structure by chemical bonding and hydrogen bonding, respectively. This results in improved surface smoothness, mechanical properties, and UV shielding ability of the film. However, the films' surface hydrophilicity increased as a result of CNE, which is harmful for food preservation in high humidity. Overall, glutaraldehyde and CNE have a synergistic effect on some of the properties of the film which is mainly attributed to the films' structure improvement. The films have great potential for preparing flexible and UV-shielding films and offer new ideas for developing biodegradable films.
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PubMed
高影响因子
Journal of Nanomaterials
·
2011
·
IF 1.675
Hong Zhang,Chao Li,Jinshan Guo,Limin Zang,Jiahe Luo
Poly(methyl methacrylate)/SiO2 (PMMA/SiO2) hybrid composites were prepared via “grafting onto” strategy based on UV irradiation in the presence of iron aqueous solution. Two steps were used to graft polymethyl methacrylate (PMMA) onto the surface of nanosilica, anchoring 3-(methacryloxy) propyl trimethoxysilane (MPTS) onto the surface of nanosilica to modify it with double bonds, and then grafting PMMA onto the surface of nanosilica with FeCl3 as photoinitiator. The products were characterized by FT-IR, TGA, TEM, DLS, and XPS. The results showed that it is easy to graft PMMA onto the surface of nanosilica under UV irradiation, and the hybrid particles are monodisperse and have core-shell structure with nanosilica as the core and PMMA layers as the shell. Furthermore, the products initiated by FeCl3 have higher monomer conversion, percent grafting, and better monodispersion compared with the products initiated by traditional photoinitiator such as 2-hydroxy-4-(2-hydroxyethoxy)-2-methyl-propiophenone (Irgacure 2959).
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高影响因子
FOOD RESEARCH INTERNATIONAL
·
2025
·
IF 8
Ziyi Shen,Simeng Zhou,Yaru Zhang,Yuan Zhang,Hongyan Wang,Daxiang Li,Yijun Wang,Zhongwen Xie,Huifang Ge
Large-leaf yellow tea protein-derived oligopeptides (TPP) contain a substantial number of antioxidant peptides that facilitate skin damage repair and may be employed to mitigate skin photoaging. However, the potential alleviating mechanism by which TPP alleviates skin photoaging damage remains insufficiently understood. This study investigated the in vitro antioxidant capacity and cell migration-promoting ability of TPP. Additionally, it utilized ultraviolet (UV)-exposed and intrinsically aged ICR mice, which exhibit signs of skin aging, to assess the effects of an 8-week oral TPP intervention. The findings indicate that TPP exhibits potent free radical scavenging properties, which mitigate oxidative damage in Raw264.7 cells and promote the migration of NIH/3 T3 cells. TPP intervention significantly ameliorates oxidative stress and skin inflammation symptoms in UV-induced skin photoaging damage by restoring the activity of endogenous antioxidant enzymes and suppressing the mRNA expression of pro-inflammatory cytokines, including IL-1β , IL-6 , and TNF-α ., as well as inhibiting the MAPK/AP-1/MMP9 signaling pathways. This study proposes that TPP is a viable plant protein-derived nutritional supplement for the prevention of UV-induced skin photoaging damage.
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PubMed
高影响因子
GREEN CHEMISTRY
·
2021
·Vol. 23
·期 6
·2352-2361
·
IF 10.182
Yuanlong Guo,Long Li,Gu Guo,Min Pei,Lihua Zhang,Haibo Xie,Hui Sun,Qiang Zheng
Recently, cellulose esters with particular functionality have obtained considerable attention as they can be used in various fields; therefore, the design and facile synthesis of cellulose esters is still a prime subject of research in this area. In this study, a novel cellulose derivative, namely cellulose-3-(2-hydroxyphenyl) propionate ester (CHP), was first prepared using cellulose and 3,4-dihydrocoumarin (DHC) in dimethylsulfoxide (DMSO)/1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)/CO2, a newly developed cellulose solvent system, without adding any external catalyst. The effects of the reaction conditions on the substitution degree (DS), including DHC loading, reaction temperature and time, were systematically investigated, and the CHP with a DS of 2.35 could be prepared when the molar ratio of DHC to anhydroglucose units (AGU) was set at 6/1 at 120 °C in 3 h. The structures and thermal properties of the as-prepared CHP were fully elucidated by nuclear magnetic resonance spectroscopy (NMR), Fourier transform infrared (FT-IR) spectroscopy, differential scanning calorimetry (DSC), and thermal gravimetric analysis (TGA). The ultraviolet (UV) absorption properties and free radical scavenging ability were evaluated by UV-visible absorption spectroscopy and a well-developed 2,2-diphenyl-1-picrylhydrazyl (DPPH)-based colorimetric protocol. The CHPs were identified to have satisfactory UV absorption properties and antioxidant capacity, and the instant DPPH radical scavenging activity reached 68.1% to 100% in 30 min when 40 mM of CHP was applied at 25 °C. Kinetic studies demonstrated that the reaction followed a pseudo-first order reaction kinetic model, and the activation energy (Ea) and Arrhenius frequency factor (A) of CHP-3 to DPPH could be calculated to be 24.24 kJ mol−1 and 2.5918 s−1 by the Arrhenius equation, respectively. The cytotoxicity of the CHPs was also primary evaluated in L929 cells to identify the potential of CHPs for biomedical applications.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 9
·49913
·
IF 2.52
Mengwei Dai,Pan Song,Yong Zhang
A castor oil (CO) was modified via thiol-ene click chemistry reaction between CO and 3-mercaptopropyl trimethoxysilane, with the conversion of CC bonds of CO over 99% based on 1 HNMR spectra. The obtained modified castor oil (MCO) was used as a biobased polyol to prepare waterborne polyurethane (WPU) dispersions. The modification of CO exhibited a great effect on the properties of WPU dispersions and coatings, and an obvious change is the improvement of the water resistance of WPU coatings. WPU dispersions with MCO had good storage stability. A WPU coating with 7% MCO had high surface hydrophobicity, and its water absorption was as low as 3.2%. Conductive carbon black filled WPU coatings with MCO were cured by efficient UV radiation, and their conductive percolation threshold could decrease to 0.76%, which could be attributed to the well filler dispersion and strong filler-polymer interaction. The WPU dispersions are ecofriendly, and can be used to produce biobased WPU coatings with a great application potential in antistatic coating fields.
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高影响因子
Frontiers in Plant Science
·
2024
·
IF 4.1
Li Shuang,Yang Lei,Wang Min,Chen Yang,Yu Jianjun,Chen Hao,Yang Haijian,Wang Wu,Cai Zhiyong,Hong Lin
Introduction: Citrus fruit is rich in important functional constituents such as flavonoids, phenolic acids terpenes and other functional substances that play an important role for treating clinical diseases or controlling major agricultural diseases and pests. Plant secondary metabolites have become one of the most important resources of novel lead compounds, especially young citrus fruits contain multiple functional substances. ‘Orah’, a type of citrus reticulata, is known for its fine appearance, productivity, delicious sweetness, late-maturing characteristics, and is widely cultivated in China. Fruit thinning and rootstock selection are commonly used agronomic measures in its production to ensure its quality and tree vigor. However, few studies have demonstrated the effects of these agronomic measures on the functional substances of ‘Orah’.Methods: In this study, we used HPLC coupled with UV to detect the dynamic changes of fruit quality, 13 main flavonoids, 7 phenolic acids, 2 terpenes, synephrine and antioxidant capacity in both peel and pulp of citrus fruits grafted on four rootstocks (Red orange Citrus reticulata Blanco cv. red tangerine, Ziyang xiangcheng Citrus junos Sieb. ex Tanaka, Trifoliate orange Poncirus trifoliata L. Raf, and Carrizo citrange Citrus sinensis Osb.×P.trifoliate Raf) at six different developmental stages (from 90 DAF to 240 DAF).Results: The results indicated that rootstock can significantly affect the contents of functional constituents and antioxidant capacity in ‘Orah’. Additionally, it was found that pruning at either 90 DAF (days after flowering) or 150 DAF produced the most favorable outcomes for extracting functional substances. We also identified rootstock ‘Trifoliate orange’ has the highest total soluble solids (TSS) and ‘Ziyang xiangcheng’ to be the optimal in terms of comprehensive sensory of fruit quality, while ‘Red orange’ and ‘Ziyang xiangcheng’ are optimal in terms of functional substance quality, and ‘Red orange’ excels in antioxidant capacity.Discussion: Overall, the findings demonstrate the important role of rootstocks and developmental stage in shaping fruit sensory quality and functional substance synthesis, providing valuable insights for guiding rootstock selection, determining thinning time, and utilizing pruned fruits in a more informed manner.
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高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2019
·
IF 4.959
Shuai Zhou,Chendi Ding,Cheng Wang,Jiajun Fu
The chemotherapy combined with gene therapy has emerged as a promising strategy for cancer therapy because of enhanced anticancer efficacy. To this end, we constructed a novel UV-light cross-linked and pH de-cross-linked coumarin-decorated cationic copolymer functionalized mesoporous silica nanoparticles (MSN) for co-delivery of chemotherapeutic agent 5-FU and tumor suppresser p53 gene. The multifunctional MSN were modified with poly(glycidyl methacrylate)-b-poly(2-(dimethylamino)ethyl methacrylate) (PGMA-b-PDMAEMA) via two sequential surface-initiated atom transfer radical polymerization (ATRP), followed by ring-opening of epoxy groups with ethanediamine and covalent conjugation with coumarin moieties via acid-liable cis-aconityl bonds. The in vitro drug release results indicated that the premature release was negligible at physiological pH when coumarin moieties on the MSN-g-PCAAMC-b-PDMAEMA surface underwent UV-light induced photo-dimerization (cross-linking), while the release of embedded drugs was accelerated under acidic conditions, which was attributed to the hydrolytic cleavage of cis-aconityl bonds (de-crosslinking). In addition to small-molecule drug, the established MSN-g-PCAAMC-b-PDMAEMA also could carry p53 gene in outer cationic copolymers, and the formed complex exhibited good gene transfection activity. Interestingly, coumarin moieties themselves could emit blue fluorescence, which was used to track the cellular uptake of the nanocarriers without the need of additional fluorescence probes. Importantly, the cytotoxicity and cell apoptosis assays confirmed that co-delivery of 5-FU and p53 gene by the cross-linked [email protected] /p53 induced enhanced chemotherapeutic efficacy as compared to 5-FU delivery alone. In conclusion, these results suggested that the constructed stimuli-responsive co-delivery system may hold the promise for cancer therapeutic application.
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PubMed
高影响因子
POSTHARVEST BIOLOGY AND TECHNOLOGY
·
2013
·
IF 2.454
Jianwen Bu,Yucong Yu,Guzhanuer Aisikaer,Tiejin Ying
Mature green cherry tomato fruit were harvested and treated with ultraviolet-C (UV-C) irradiation at a predetermined dose of 4.2 kJ m −2 and stored at 18 °C for 35 days. The effects of UV-C treatment on firmness, cell wall compositions (pectin and cellulose), cell wall ultra-structure, levels of ethylene production, and activities of cell wall degrading enzymes in the fruit were investigated during storage. Major genes involved in cell wall degradation ( PME 2.1, Cel 1, PG cat and Exp 1) were also checked. Fruit firmness was better maintained in UV-C treated fruit corresponding with higher contents of cellulose and acid-soluble pectin. Transmission electron microscopy indicated that UV-C irradiation retarded cell wall disassembly in the pericarp. Ethylene production was significantly inhibited by UV-C treatment. The UV-C treatment also suppressed the transcriptional expression of PME2.1 , Cel1 , PGcat and Exp1 genes, and inhibited pectin methylesterase (PME; EC 3.1.1.11), polygalacturonase (PG; EC3.2.1.15) and cellulase (EC3.2.1.4) activities during storage. These results suggested that the inhibition of ethylene production, which in turn down-regulated expression of genes encoding cell wall degrading enzymes, might be one of the possible mechanisms of UV-C delaying tomato fruit softening.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2016
·Vol. 23
·期 9
·1-9
·
IF 1.969
Kong Zhiyun,Wu Xiaoqing,Wei Junfu,Zhang Huan,Cui Li
The hydrophilic fibers based on 2-(dimethylamino)ethyl methacrylate (DMAEMA) which could remove Cr(VI) ions rapidly were prepared by UV-irradiation induced grafting of DMAEMA through pre-coating photoinitiator on the fibers and modifying with bromoethane(BE). The FTIR, FESEM, XPS, TG-DTG and contact angle spectra manifested that DMAEMA was grafted onto the surface of PP fibers and subsequently was quaternized. The maximum grafting degree (22.9 %) and exchange capacity of DMAEMA (1.2 mmol g −1 ) was obtained when PP fibers was immersed in BP concentration of 0.3 % for 4 h, irradiated with the DMAEMA concentration of 100 % and irradiation time of 20 min, and then was modified with BE. The modified fibers of PP-g-DMAEMA with bromoethane were proved to remove Cr(VI) and As(V) with removal rate of 97.3 % and 96.2 % within 10 min, respectively. The prepared fibers have potential application for the removal of Cr(VI) and As(V) from wastewater highly and rapidly.
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高影响因子
危险品化学品经营许可证（带存储）