DYES AND PIGMENTS
·
2019
·
IF 4.018
Wenjing Qi,Maoyu Zhao,Yuling Fu,Hongkun He,Xue Tian,Di Wu,Yan Zhang,Ping Ping Hu
Lanthanide coordination nanoparticles terbium(III) (Tb 3+ )-based fluorescent nanoparticles (luminol-Tb NPs) are synthesized via aggregation-induced fluorescence strategy. Fluorescence of luminol-Tb NPs is enhanced nearly 40 times compared with luminol, which is the effect of aggregation-induced fluorescence by Tb 3+ . Luminol-Tb NPs with high fluorescence is utilized in fluorescent “turn-off” detection of uric acid (UA) within 1 min from 0.1 to 50 μM with the limit of detection (LOD) of 28 nM. The fluorescence quenching effect may be ascribed to photoinduced electron transfer occurs from luminol-Tb NPs to UA. This fluorescent method exhibits high selectivity in UA detection towards metal ions, glucose, ascorbic acid , dopamine, creatinine, urea and cysteine. When it is also applied in detection of UA in serum samples, 5 μM, 10 μM and 30 μM UA are respectively added to serum samples and recoveries range from 97.5% to 101.3% in serum samples. It demonstrates the practical value of luminol-Tb NPs for UA detection in serum.
研究领域:
生物化学
·
分析化学
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产品关联
DOI
高影响因子
JOURNAL OF PLANT PHYSIOLOGY
·
2023
·
IF 4.3
Guofu Luo,Yirui Shen,Kun Wu,Huining Yang,Chuntao Wu,Xiangbing Chang,Wei Tian
Application of elicitors can greatly enhance plant immune resistance against pathogens. However, it is still obscure whether elicitor activity is influenced by diverse sources. This study investigated the effect of foliar spraying of 19 batches of Chrysanthemum indicum polysaccharides (CIPs) on the disease resistance of Atractylodes macrocephala Koidz. ( A. macrocephala ) and explored the main reasons for the differences of inducing activity of CIP elicitors. PCA, OPLS-DA, grey relational analysis and entropy weight method had good predictability for the activity evaluation of CIP elicitors and other plant-derived elicitors. The results showed that 19 batches of CIPs had definite regional differences in inducing activity and monosaccharide content. CIP elicitors with high inducing activity could significantly increase the accumulation of Atractylenolide Ⅱ and Atractylenolide Ⅲ, the mRNA relative transcription level of CAT , POD , PAL genes, the amount of pH change in the medium and effectively reduce the disease index of A. macrocephala . Furthermore, CIP with high inducing activity exhibited the high contents of Rha, Ara and GalA, which might be the main contributor to their high activity. The evaluation procedure developed in this work can be applied for screening CIP elicitors with high inducing activity, and it lays a foundation for identifying more functional elicitors related to plant immune resistance.
研究领域:
植物科学
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药用植物学
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分子生物学
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产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2016
·Vol. 21
·期 5
·555
·
IF 2.465
Zhongxiu Zhang,Xiaohui Wang,Wanqing Yang,Juan Wang,Cong Su,Xiao Liu,Jun Li,Yunfang Zhao,Shepo Shi,Pengfei Tu
Five 2-(2-phenylethyl)chromones including a new one, (5S,6R,7S,8R)-5,8-dichloro-6,7-dihydroxy-2-phenylethyl-5,6,7,8-tetrahydro-4H-chromen-4-one (1), and four known ones (2–5), were isolated from 150 mM NaCl-elicitedAquilaria sinensiscell suspension cultures. In addition, three feruloyl amides (6–8), six nucleosides (9–14), (+)-syringaresinol (15), indole-3-carboxaldehyde (16), and two glycosides (17–18) were also obtained. The structures were unambiguously identified by analysis of their UV, IR, NMR, and HRESIMS data. The absolute configuration of the new 2-(2-phenylethyl)chromone (1) was established by a dimolybdenum tetraacetate-induced circular dichroism experiment. Compared to un-elicited cell lines, the appearance of 2-(2-phenylethyl)chromones in NaCl-treated cells occurred on the 3rd and 5th days of their treatment. 2-(2-Phenylethyl)chromones, feruloyl amides, nucleosides, and lignins have been reported to be closely related to plant defense; therefore, the identification of these compounds from NaCl-elicitedA. sinensiscell suspension cultures would be useful for further exploring the mechanism of agarwood formation.Keywords:2-(2-phenylethyl)chromone;induced circular dichroism;Aquilaria sinensis;agarwood;cell suspension cultures;sodium chloride elicitation
研究领域:
植物学
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天然产物化学
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药用植物研究
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产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 6
·3747-3762
·
IF 3.917
Xing Xiao-Yan,Gu Lin,Jin Yu,Sun Rui,Xie Meng-Yun,Wu Qing-Yun
Abstract Cellulose triacetate (CTA) porous membranes were firstly prepared by the combined nonsolvent-thermally induced phase separation (N-TIPS) method. Dimethyl sulfone (DMSO2) and polyethylene glycol (PEG400) were respectively chosen as the TIPS solvent and additive of CTA, while water was used as the NIPS nonsolvent. Their Hansen solubility parameters were analyzed to understand the solution thermodynamics. Detailed investigation was applied on the effects of the polymer concentration, the coagulation bath temperature and the coagulation bath composition on the CTA porous membranes. It is found that both NIPS and TIPS effects simultaneously exist and compete with each other, and further affect the membrane morphology and performance. The NIPS effect can be promoted by lowering the CTA concentration or elevating the coagulation bath temperature, resulting in figure-like macropores and porous top surface. The obtained CTA porous membranes show a water flux as high as 2002.9 ± 55.2 L/m 2 h. On the contrary, the TIPS effect becomes the dominant factor, and leads to the symmetric sponge-like pores, which facilitate to enhance the mechanical properties. Besides, CTA porous membranes present large surface pore size as well as low fraction of figure-like macropores as increasing the DMSO2 content in the coagulation bath. These CTA porous membranes with excellent water permeability and mechanical strength are promising candidates for microfiltration or the porous substrates of thin film composite membranes. Graphical abstract
研究领域:
材料科学
·
膜技术
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Huarong Yu,Siyuan Shangguan,Haiyang Yang,Hongwei Rong,Fangshu Qu
Poly(vinylidene fluoride) (PVDF) is one of the most used membrane materials in the water industries, and the PVDF membrane can be fabricated majorly through non-solvent induced phase separation (NIPS) and thermally induced phase separation (TIPS). The differences in membrane aging of NIPS-PVDF and TIPS-PVDF remain unclear. In this study, the agings of commercially available NIPS-PVDF and TIPS-PVDF membranes were investigated in the pilot-scale MBRs experiment as well as in the batch soaking tests. The raw PVDF powders in different crystalline polymorphs were also subjected to aging tests to examine the relation between PVDF polymorphous structure and aging. The results showed that the NIPS-PVDF membrane experienced more severe aging in the pilot-scale MBR experiment in comparison with the TIPS-PVDF membrane. Acid aging dislodged and eliminated the additives in the membrane, but did not attack the PVDF. NIPS-PVDF membrane was the dominant β PVDF phase, which was more susceptible to dehydrochlorination in alkaline oxide aging. The thin top layer in the asymmetric structure of the NIPS-PVDF membrane resulted in its vulnerability against alkaline oxide aging. The α PVDF phase and the symmetric structure of the TIPS-PVDF membrane contributed to its greater stability in alkaline oxide aging. Overall, the results can provide a basis for selecting a chemical cleaning strategy for PVDF membranes, and for improving the anti-aging characteristics of the PVDF in the membrane fabrication.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Hang Ao,Hui Feng,Keqing Li,Meizhi Zhao,Zhaosheng Qian,Jianrong Chen
Luminescent materials with aggregation-induced emission (AIE) have been widely used in chemosensors and biosensors based on signal change induced by physical aggregation of AIEgens. In this work, a novel coordinate bonding-induced emission (BIE) phenomenon of gold-glutathione complex was proposed and identified, and this specific coordinate BIE was further utilized to develop signal-enhanced methods for quantification of aluminum species including aluminum cation and polyoxocation AlO 4 Al 12 (OH) 24 (H 2 O) 12 7+ . Gold-glutathione (Au-GSH) complex has shown significant aggregation-induced emission characteristic, and it can sensitively respond to multiple external stimuli such as solvent polarity and pH via an emission-enhancing fashion. It is found that the introduction of aluminum cation to Au-GSH complex is able to more greatly enhance the luminescence through a coordinate bonding-induced emission process, and this BIE behavior is attributed to strong force induced by coordination reaction between glutathione ligands and aluminum cation. In comparison with AIE process, coordinate BIE process was shown to be a more efficient way to enhance the emission. This BIE property of Au-GSH complex was employed to measure aluminum cation and polyoxocation Al 13 with good selectivity. This work provides a new coordinate bonding-induced emission phenomenon, and gives a demonstration of designing chemosensors for metal cations based on coordinate BIE process.
研究领域:
分析化学
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材料科学
·
环境化学
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DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2021
·
IF 9.147
Yalei Dai,Jingyun Zhao,Jin Gao,Qianchun Deng,Chuyun Wan,Bin Li,Bin Zhou
Our previous research had witnessed an efficient yet facile desalination method of salted duck egg white (SDEW) based on the reversible nature of gelatin (GEL) under mild conditions. This current study focused on engineering different gel systems based on desalted duck egg white/gelatin mixture (DDG), namely heat- and cold-induced gels, and the gel properties were further studied. Under the condition of small amplitude oscillatory shear (SAOS), the heat-induced DDG mixed gels has more linear viscoelastic regions and higher yield stress value than the cold-set gels. Additionally, the creep and recovery results demonstrated such heat-induced gels were harder but less elastic than that cold-induced gels. The strain hardening behavior of the gels was observed under high-amplitude oscillating shear. In the large amplitude oscillatory shear (LAOS) measurement, the Lissajous curves showed that in the elasticity analysis of these two different mixed gels, the heated hybrid gels were more elastic. As the content of GEL increased, GEL endowed higher water holding capacity of the hybrid gels. Compared with the cold-set gels, we found that the heat-induced mixed gels appeared a dense porous network microstructure, had greater impact on the water retention. In short, the different properties of constructed gels provided a new way for the utilization of desalted duck egg whites and basic data support for the construction of gel foods.
研究领域:
食品科学
·
生物化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
·
2024
·
IF 3.2
Yiting Wang,Xinxin Wang,Weixiang Chen,Longguan Zhu,Bingjian Zhang
It has become widely acknowledged that certain underwater cultural relics, in a state of severe decay, should be salvaged for further protection. Underwater temporary reinforcement materials provide the possibility for such protection. These materials can achieve both the reinforcement of cultural relics underwater, as well as their reversible removal after extraction, without causing damage to the cultural relics in either process. In this context, two kinds of hydrogels based on polyethylene glycol-derived polymers were developed in this study. They are denser than water and can undergo gelatinization by UV-induced or oxidant-induced reactions in the underwater environment. Additionally, they possess enough mechanical strength to provide the necessary support in the bonding process. Both hydrogels have been successfully used to extract fragile underwater archaeological wooden artifacts in situ under laboratory conditions. The experimental results revealed that, in the case of UV-induced hydrogels, the compression strength was 115 kPa with a tensile strength of 20 kPa. For oxidant-induced hydrogels, the compression strength was 382 kPa, while the tensile strength was 8.2 kPa. During the actual extraction processes, the UV-induced hydrogel exhibited a lower water absorption ratio, maintained a more stable mechanical property underwater, and was easier to remove after extraction. On the other hand, the oxidant-induced hydrogel could complete the gelation process quickly through a rather convenient operation; however, it tended to absorb surrounding water and swell, thereby reducing its mechanical property. These two methods would be adapted to different underwater archaeological sites as convenient, environmentally friendly, and cost-effective novel methods for extracting fragile underwater wooden relics.
研究领域:
材料科学
·
文物保护
·
环境科学
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产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 9
·3650
·
IF 4.6
Jing Zhu,Lei Hu,Xiangying Meng,Feng Li,Wenjuan Wang,Guiyang Shi,Zhongxia Wang
Carbon-based nanoprobes, with excellent physicochemical performance and biocompatibility, are a kind of ideal nanomaterial for biosensing. Herein, we designed and prepared novel oxygen-doped nitrogen-enrichment carbon nanoribbons (ONCNs) with an excellent optical performance and uniform morphology, which could be used as a dual-mode fluorescence probe for the detection of Ag+ion and captopril (Ctl) based on the synergism of photo-induced electron transfer and aggregation-induced quenching mechanisms. By recording the changes in fluorescent intensities of ONCNs, the Ag+ion and Ctl concentrations can be easily tested in real samples. The results displayed that two good linear relationships existed between the change in fluorescent intensity of ONCNs and the concentrations of Ag+ion and Ctl in the ranges of 3 μM to 30 μM and 1 μM to 30 μM, with the detection limit of 0.78 µM and 74 nM, respectively. The proposed sensing platform has also been successfully applied for the Ctl analysis in commercial tablet samples based on its high selectivity, proving its value in practical applications.Keywords:carbon-based nanoprobe;photo-induced electron transfer;aggregation-induced quenching;metal ion detection;drug analysis
研究领域:
分析化学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Jiaqi Luo,Yingchen Wang,Qiutong Zhang,Wenhao Yan,Mingting Yuan,Yimin Jia,Qiushuo Yu,Xinyue Zhai,Yuan Zou
In order to identify the crystallization induction period precisely, this study developed a fluorescence method based on aggregation-induced emission (AIE) characteristics. Accurate identification of the early stage of nucleation was made possible by tracking molecular aggregation through monitoring of the fluorescence intensity using N-phenylanthranilic acid (NPAA) as the model compound. The results showed that the fluorescence method had a significantly greater sensitivity and detected nucleation earlier than the traditional visual inspection method. Furthermore, a combination of experimental analysis and molecular dynamics simulations was employed to investigate the regulatory effects of surfactants on the nucleation process. Tetradonium bromide (TTAB) promoted nucleation by reducing the nucleation barrier through electrostatic attraction and hydrophobic interactions, thereby accelerating crystal formation. On the other hand, by enhancing solvation effects and electrostatic repulsion, sodium dodecyl sulfate (SDS) prevented molecular aggregation and resulted in a longer induction period. This study showed the important regulating role of surfactants in the crystallization process in addition to validating the effectiveness of the fluorescence method.
研究领域:
晶体学
·
物理化学
·
材料科学
·
分析化学
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产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Fengyun Shi,Wan Zhang,Junqian Zhang,Hongkun Li,Bing Shi Li
Realizing high circularly polarized luminescence (CPL) in polymer system is an important but challenging task. Herein, we provide a strategy for designing conjugated polymers with high CPL performance upon the complexation with mandelic acids. Two tetraphenylethylene (TPE)-based conjugated polymers, l - P1 and d - P1 , were synthesized by Sonogashira polycoupling reactions between the TPE-containing diethynyl monomer and dibromo aryl monomers carrying valine methyl ester groups. Both the polymers showed aggregation-induced emission (AIE) properties and the capabilities to self-assemble into regular helical nanostructures on nanoscale and fluorescent microfibers on microscale. They exhibited weak circular dichroism (CD) signals; upon the complexation with R / S -mandelic acids, their CD absorption and fluorescence emission can be efficiently enhanced. The composite films of l/d - P1 and R / S -mandelic acids exhibited excellent complexation-induced CPL properties with the absolute luminescence dissymmetric factor ( g lum ) up to 0.01 and the fluorescence quantum yield up to 26.8%; the g lum values showed little dependence on their emission wavelength. Various types of carboxyl acids have been screened and only mandelic acids show significantly chiroptical induction. The specific interaction between mandelic acids and l/d - P1 also makes the latter promising candidates for the enantioselective recognition of chiral organic molecules.
研究领域:
材料科学
·
有机化学
·
光化学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Yaqi Dong,Haisheng Zhang,Xin Liu,Xinzhao Luo,Yanqiu Wang,Qiang Zhang
Degradable block copolymers are considered as ideal templates to prepare porous membranes with tunable nanostructure. However, most of these templates are hydrophobic and it remains a challenge to make nanoporous and charged membranes using such templates that contain a sacrificial block through phase inversion. Herein, block copolymers poly(ε-caprolactone)- b -poly(4-vinyl pyridine) have served as cross-linkable and degradable templates to prepare porous and dense membranes via non-solvent induced phase separation (NIPS) or solvent evaporation-induced phase separation (SIPS). During NIPS, the prepared membranes showed a dense skin and finger-like or sponge-like sublayer. By controlling the quaternization and degradation of templates, the permeance of pure water and molecular weight cut-off performance tuning were achieved. The above ultrafiltration membranes with well-defined pores exhibited excellent rejection ability towards different dyes based on size exclusion and Donnan effect. Moreover, after being treated with NaOH solution, the membranes fabricated via SIPS showed a unique change from dense to hollow cross-sectional structure, which also demonstrated promising electrodialysis desalination performance and electrodialysis stability.
研究领域:
材料科学
·
环境工程
·
化学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）