MATERIALS LETTERS
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2020
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IF 3.204
Shang Xiang,Jingkui Yang,Zhenyu Cui,Shuhao Qin,Qingqing Qin
Polyvinylidene fluoride/polyamide6-grafting-tannic acid (PVDF/PA6-g-TA) hollow fiber membrane was prepared via the reaction between TA and PA6 on the membrane surface by thermally induced phase separation (TIPS) technique. The reaction mechanism and the distribution for TA on outer surface were explored. The change of surface morphology, hydrophilicity, chargeability, anti-fouling capacity and permeability was investigated after grafting. It was found that Schiff base reaction occurred between amino group and phenolic hydroxyl group, and thus avoided the falling of TA. The uniform distribution of TA on outer surface enhanced the hydrophilicity, rejection and anti-fouling capacity. Finally, the improvement of anti-fouling capacity and permeability was analyzed from chargeability for TA and bond water layer on repulsing the stackage of the pollutants. This work provides an efficient way to enhance the anti-fouling performance of membrane via TIPS.
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Advances in Materials Science and Engineering
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2020
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IF 1.271
Peiyuan Chen,Yonghui Wang,Shicheng He,Pengju Wang,Ying Xu,Liheng Zhang
This study proposes a green, low-cost, and robust method to synthesize spherical calcium hydroxide (CH) nanoparticles based on the co-precipitation of Ca2+ and OH− in the presence of tannic acid (TA), an inexpensive plant-derived polyphenol. It has been found that the morphology and crystalline phase of the produced CH nanoparticles can be controlled by TA. With the increasing dosage of TA, the crystallinity of the CH particles reduces, changing from well crystallization to amorphous phases. Experimental evidence suggests that complexion reaction took place between TA and Ca2+, which gave the Ca2+ a strong bond effect. As a result, the nucleation and growth of CH were significantly affected. CH nanoparticles with sizes of about 50 nm have been successfully synthesized by using 0.3% or more TA.
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FOOD HYDROCOLLOIDS
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2020
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IF 7.053
Yang Guo,Yi-hong Bao,Kai-feng Sun,Chen Chang,Wei-feng Liu
The effects of covalent cross-linking of soy protein isolate (SPI-12%) with tannic acid (TA-29,58,88,117,146 μmol/g SPI) in an alkaline environment on the structure, antioxidant activity and gelation characteristics of SPI-TA conjugates were found to improve all properties. After alkali treatment, the tryptophan content in the conjugate decreased and the covalent binding rate increased. The addition of TA initiated irreversible SPI modifications, as shown by sodium dodecyl sulfate−polyacrylamide gel electrophoresis (SDS-PAGE), Fourier transform infrared (FTIR) spectroscopy, fluorescence spectroscopy and thermogravimetry. The texture analysis of the gel showed that hardness and elasticity were optimal at pH 11, and the rheological properties of the storage modulus (G′) and loss modulus (G″) increased with higher TA concentrations. Analysis of the microstructure indicates that an increase in TA concentration results in a more compact network structure. Our results indicate that pH-dependent interactions between SPI and TA modify the formation of the gel in a way that improves the rheology and textural properties of the gels.
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SURFACE & COATINGS TECHNOLOGY
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2020
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IF 3.784
Shang Fang,Zhepeng Zhang,Hao Yang,Gang Wang,Lin Gu,Lei Xia,Zhixiang Zeng,Lijing Zhu
During the water treatment process, the common polymer membranes with high interface energy are frequently contaminated by oily water. The wettability of the separation membrane surface greatly limits the application range of the membrane. Here, a facile method is reported to fabricate a hydrophilic and underwater superoleophobic coating on hydrophobic polypropylene (PP) microfiltration membrane via co-deposition of tannic acid (TA), polyethyleneimine (PEI), and dopamine (DA). After modification, the microfiltration membrane exhibits excellent hydrophilicity, outstanding acid, alkali and organic solvent resistance . In addition, they can be applied to separate n-hexane-in-water emulsions driven by self-gravity with excellent water flux (489 ± 24 Lm −2 h −1 ) and high separation efficiency (99.8%). The fabricated TA/DA/PEI coating with outstanding performances has great potential application in the field of oily water treatment.
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ACS Applied Materials & Interfaces
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2021
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IF 9.229
Zhirui He,Weizhong Yuan
As a flexible wearable device, hydrogel-based sensors have attracted widespread attention in soft electronics. However, the application of traditional hydrogels at extreme temperatures or for a long-term stability still remain a challenge because of the existence of water. Herein, we reported an antifreezing and antidrying organohydrogel with high transparency (over 85% transmittance), high stretchability (up to 1200%), and robust adhesiveness to various substrates, which consist of polyacrylic acid, gelatin, AlCl3+, and tannic acid in a water/glycerin binary solvent as the dispersion medium. As the binary solvent easily forms strong hydrogen bonds with water molecules, organohydrogels exhibited excellent tolerance for drying and freezing. The organohydrogels maintained conductivity, adhesion, and stable sensitivity after a long-term storage or at subzero temperature (−14 °C). Moreover, the organohydrogel-based wearable sensors with a gauge factor of 2.5 (strain, 0–100%) could detect both large-scale movements and subtle motions. Therefore, the multifunctional organohydrogel-wearable sensors with antifreezing and antidrying properties have promising potential for human–machine interfaces and healthcare monitoring under a broad range of environmental conditions.
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PubMed
高影响因子
Polymers
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2020
·Vol. 12
·期 12
·3008
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IF 3.426
Menghui Wan,Haodong Zhao,Lichao Peng,Xueyan Zou,Yanbao Zhao,Lei Sun
In this paper, we propose a facile and cost-effective electrospinning technique to fabricate surface-enhanced Raman scattering (SERS) substrates, which is appropriate for multiple analytes detection. First of all, HAuCl4∙3H2O was added into the TEOS/PVP precursor solution, and flexible SiO2nanofibers incorporated with gold nanoparticles (SiO2@Au) were prepared by electrospinning and calcination. Subsequently, the nanofibrous membranes were immersed in the tannic acid and 3-aminopropyltriethoxysilane solution for surface modification through Michael addition reaction. Finally, the composite nanofibers (Ag@T-A@SiO2@Au) were obtained by the in-situ growth of Ag nanoparticles on the surfaces of nanofibers with tannic acid as a reducing agent. Due to the synergistic enhancement of Au and Ag nanoparticles, the flexible and self-supporting composite nanofibrous membranes have excellent SERS properties. Serving as SERS substrates, they are extremely sensitive to the detection of 4-mercaptophenol and 4-mercaptobenzoic acid, with an enhancement factor of 108. Moreover, they could be utilized to detect analytes such as pesticide thiram at a low concentration of 10−8mol/L, and the substrates retain excellent Raman signals stability during the durability test of 60 days. Furthermore, the as-fabricated substrates, as a versatile SERS platform, could be used to detect bacteria ofStaphylococcus aureuswithout a specific and complicated bacteria-aptamer conjugation procedure, and the detection limit is up to 103colony forming units/mL. Meanwhile, the substrates also show an excellent repeatability of SERS response forS. aureusorganelles. Briefly, the prime novelty of this work is the fabrication of Au/Ag bimetallic synergetic enhancement substrates as SERS platform for versatile detection with high sensitivity and stability.Keywords:Ag/Au nanoparticles;synergetic enhancement;electrospun nanofibers;SERS substrates;versatile detection
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DRUG DELIVERY
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2021
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IF 6.419
Ying Liu,Yue Han,Tingting Zhu,Xianglei Wu,Wenxin Yu,Jiafang Zhu,Ying Shang,Xiaoxi Lin,Tianlan Zhao
Hyperpigmentation is a common complaint and distressing problem in dermatology, and tranexamic acid (TA) is an effective treatment agent but limited by the delivery to melanocytes in the epidermis. Herein, a novel TA naogels (named HA/TA-LP), combining the advantages of liposomes and hyaluronic acid (HA), are prepared and assessed for topical hyperpigmentation treatment with targeting delivery and minimizing epidermal diffusion. Morphological characteristics indicate numerous TA-loaded liposomes packed in HA gels. In vitro cell studies using human A375 melanoma cells show that HA/TA-LP can promote the uptake of TA by targeting delivery with resulting inhibition of tyrosinase activity and melanin production. Guinea pigs are used to construct hyperpigmentation models and investigate the topical delivery and treatment efficacy of HA/TA-LP. In vivo topical delivery studies indicate HA/TA-LP realize the effective delivery into melanocytes with an ideal balance of effective permeability and minimizing epidermal diffusion. Subsequently, hyperpigmentation treatment assessments reveal that HA/TA-LP inhibit tyrosinase activity and melanin production under the radiation of UVB. Our study identifies favorable properties of HA/TA-LP for treating hyperpigmentation, and provides an experimental basis for further clinical application.
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PubMed
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FOOD HYDROCOLLOIDS
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2020
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IF 7.053
Xianling Wei,Jing Li,Mohamed Eid,Bin Li
Soybean oil-based emulsions stabilized by tannic acid (TA) and wheat starch (WS) complexes were prepared via a simple high-intensity ultrasound emulsification technique. The effects of mass ratio of TA/WS (0.005–0.75) and WS concentration (0.25%, 0.5% and 1.0%) on TA/WS complexes and emulsions were investigated. As the mass ratio increased, TA and WS could gradually form soluble and insoluble complexes, and their hydrophobicity also improved. Consequently, the tendency of the particle size of emulsions to decrease first and then increase appeared with the increasing mass ratio, mainly due to the changes in the contents, size and hydrophobicity of the complex emulsifier. Additionally, the emulsifying capacity of TA/WS complexes improved with increasing concentration of complexes. Moreover, the creaming was inhibited at a high mass ratio or high complex concentration due to the formation of a thick interfacial network around oil droplets or obtention of smaller-sized droplets. Emulsion gel was formed due to TA cross-linked WS on the interface within different oil droplets, and the strength of the gel increased with the mass ratio due to increasing amounts of complexes being absorbed on the interface. When the mass ratio and WS concentration were no less than 0.05 and 0.5%, respectively, emulsions had better oxidative stability. The complexes also had high resistance against droplet coalescence. This study demonstrated that TA/WS complexes could be employed as an emulsifier to improve the oxidative stability of O/W emulsions and that easily oxidized, oil-soluble nutrients or medicines could be protected and delivered through these emulsion systems.
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Journal of Environmental Chemical Engineering
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2020
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IF 4.3
Jiamu Xiao,Dongdong Ge,Haiping Yuan,Nanwen Zhu
Fe 2+ /persulfate process can be used to improve sludge dewaterability significantly. However, a large dose of chemicals was always needed and it will cause filter cloth clogging, equipment corrosion and sludge calorific value reduction in practice. In this study, a new Fe 2+ /persulfate/TA (tannic acid) process was put forward, which could reduce the use of inorganic reagents and keep the outstanding conditioning capability. A Box-Behnken experimental design method based on response surface methodology (RSM) was selected to assess the roles of independent variables including SPS (sodium persulfate), Fe 2+ and TA, on sludge dewaterability characterized by capillary suction time, specific resistance of filtration, and water content of dewatered sludge cake. The optimized conditions were SPS dosage of 0.43 mmol/gTS (total solid), Fe 2+ dosage of 0.58 mmol/gTS and TA dosage of 0.14 mmol/gTS, at which the water content of dewatered sludge cake showed (75.89 ± 0.01)% highly close to the predicted minimum water content of dewatered sludge cake using the fitted equation. Moreover, in the new process, sludge properties altered distinctly with the elimination of extracellular protein, supernatant viscosity reduction and particle size increase. Further investigations were needed to explore the underlying mechanism and practical application for a better and comphrensive understanding of Fe 2+ /SPS/TA process.
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MACROMOLECULAR RAPID COMMUNICATIONS
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2020
·Vol. 41
·期 14
·2000202
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IF 4.886
Xuefeng Li,Xueyin Peng,Rongzhe Li,Yikun Zhang,Zuifang Liu,Yiwan Huang,Shijun Long,Haiyan Li
The research on multiple hydrogen bonds (H-bonds) hydrogels have gradually aroused wide interest. In this paper, a multiple H-bonds-reinforced poly(acrylamide- co -2-vinyl-4,6-diamino-2-vinyl-1,3,5-triazine)/tannic acid (P(Am- co -VDT)/TA) hydrogels are prepared. The results suggest that the prepared hydrogel has two types of H-bonds crosslinking regions: A “soft” region of H-bonds between the diaminotriazine (DAT) moieties on the polymer chains and the TA pyrogallol/catechol groups, and a “hard” region of H-bonds forming by DAT moieties with itself. The hard crosslinking region exhibits significantly higher activation energy than the soft region. Such soft and hard dual physically crosslinked networks dramatically enhance the mechanical properties of P(Am- co -VDT)/TA hydrogels in a synergistic manner (tensile strength is 2.34 MPa, elongation at break is 410%). Due to the multiple hydrogen bonds, the hydrogel has good pH sensitivity and rapid response to shape memory within a few minutes. In addition, the hydrogels have the capacity of physical adsorption of the anti-inflammatory drug diclofenac sodium and other molecules with a specific spatially arranged chemical composition. These hydrogels with high mechanical strength, excellent shape memory behavior, and capacity of adsorption of anti-inflammatory drug could be attractive candidates for applications in the fields of biomedicine, tissue engineering, and medical materials.
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CHEMOSPHERE
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2020
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IF 5.778
Jinsuo Lu,Zhanguo Cui,Xiaoyong Deng,Zhijie Liang,Shouning Chai,Junyu Fan,Zhiqiang Zhang,Zhiwei Zhao
Ferrate (Fe(VI)) is usually effective for oxidizing a variety of organic pollutants within a few seconds, but some recalcitrant asorganophosphorus pesticides such as dimethoate require higher dose of Fe(VI) and inorganic phosphorus produced by mineralization is difficult to remove. In this study, acid-activated ferrate (Fe(VI)) was firstly used to degrade organophosphorus pesticides dimethoate and simultaneously remove total phosphorus (TP) from solution under simulated sunlight. At a Fe(VI):dimethoate molar radio of 15:1, dimethoate was almost completely removed within 20 min and 47% of TP in the solution was removed by the reduction product of Fe(VI) within 240 min. Electron paramagnetic resonance (EPR) and terephthalic acid (TA) fluorescence experiments showed that •OH radicals were continuously generated in the system, and •OH formation pathway was proposed. Importantly, the involvement of •OH in acid-activated Fe(VI) process was confirmed for the first time by EPR. In the acid-activated Fe(VI)/simulated sunlight system, the removal of dimethoate and TP gradually increased with the decrement of activation pH, whereas the increase of molar ratio of Fe(VI):dimethoate enhanced the removal of dimethoate and TP. The addition of inorganic anions (HCO 3 - and NO 2 - ) had obvious inhibitory effects on dimethoate and TP removal. Eight degradation products including O,O,S-trimethylphosphorothiate, omethoate and 2- S -methyl-(N-methyl) acetamide were determined by gas chromatography mass spectrometry (GC-MS) analysis, and two possible degradation pathways were proposed. The insights gained from this study open a new avenue to simultaneously degrade and remove organic contaminants .
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
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IF 3.573
Fangfang Zhou,Jianquan Luo,Siqing Song,Yinhua Wan
Catechol–amine codeposition can improve the stability of a mussel-inspired coating layer (e.g., dopamine, tannic acid, gallic acid) but its superior performance on enzyme immobilization has not been studied yet. For the first time, a tannic acid-3-aminopropyltriethoxysilane (TA–APTES) coating was investigated for carrier activation and subsequent enzyme loading via covalent bonding. During the coating process, nanoparticles were generated by the reaction between APTES and TA, and then in situ assembled and adhered to the carrier surface, resulting in a hierarchical nanostructure. The TA/APTES ratio and coating time greatly affected enzyme loading and specific activity by changing the nanoparticles’ amount/size and available quinone groups of oxidized TA. The nanoparticles offered more area (i.e., specific surface area) for enzyme loading and reaction, while the quinone groups were responsible for covalently binding the enzyme. The TA–APTES coating showed much better performance in enzyme immobilization than glutaraldehyde, genipin, and polydopamine activation strategies, thanks to its special surface nanostructure and abundant quinone groups. Secondary grafting branched polymer γ-polyglutamic acid (γ-PGA) on the TA–APTES coating layer further increased enzyme loading (3.5–4.5 times). Finally, the universality of the TA/APTES coating was demonstrated by applying it on various materials for immobilizing different enzymes and removing five micropollutants (i.e., bisphenol A, 2,4,6-trichlorophenol, aflatoxin B1 (AFB1), deoxynivalenol (DON), and tetracycline (TC)). This work not only established a novel platform for facile and efficient enzyme immobilization but also clarified the effect of surface chemistry and morphology on enzyme immobilization and micropollutant removal.
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