ACS Applied Polymer Materials
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2019
·
IF 0
Tao Zhang,Qiuyan Yu,Lanlan Fang,Jiajun Wang,Tao Wu,Pingan Song
Poly(lactic acid) (PLA) has been increasingly employed as a promising packaging material. Unfortunately, PLA film suffers low oxygen barrier and poor antifogging issues, which extremely restrict its practical applications. Despite some progress, to date it remains a challenge to construct a biodegradable, transparent, highly oxygen-barriered and antifogging coating for the PLA film via a facile approach. Here, we report a facile construction of biodegradable and all-organic coating with high transparency via hydrogen-bonded layer-by-layer assembly of poly(vinyl alcohol) (PVA) and tannic acid (TA). With the presence of 20 bilayers of PVA and TA, the oxygen permeability is reduced to 0.52 × 10–16 cm3·cm/[cm2·s·Pa], approximately 450 times lower than that of PLA film. Moreover, fogging issue for PLA film can be effectively addressed only with five bilayers of PVA and TA. These improvements are attributed to the hydrogen-bonding interactions and polyphenol groups within the multilayer coating. This work may provide a facile strategy for the design of biodegradable and highly transparent coating for the high oxygen barrier and antifogging applications by using organic molecules as building blocks.
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CARBOHYDRATE POLYMERS
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2019
·
IF 6.044
Shuo Shi,Wentao Zhang,Xinyi Ren,Min Li,Jing Sun,Guoliang Li,Yutang Wang,Tianli Yue,Jianlong Wang
Deproteinization is a crucial step for the purification of polysaccharides from natural biomass. However, traditional deproteinization technologies often suffer from complicated operating processes and the usage of toxic chemical reagents. Herein, an advanced and universal deproteinization method based on dual-functional adsorbent consisted of preferential protein adsorption coating of tannic acid-Fe III (TA-Fe III ) and magnetic Fe 3 O 4 (Fe 3 O 4 @TA-Fe III , abbreviated as FTF NPs) was developed. The proposed FTF NPs showed remarkable efficiency to remove protein from Lycium barbarum L. polysaccharides (LBPs) with deproteinization ratio of 96%, higher than the typical Sevag method (85%). Detailed adsorption kinetics studies demonstrated deproteinization process reached equilibrium after 10 min, faster than other reported deproteinization adsorbents. Furthermore, FTF NPs are structurally and functionally nondestructive as regards LBPs without using organic reagents. Also, it exhibited widespread-use deproteinization performance to several common plant species. Therefore, the proposed nano-separation based on TA-Fe III complex is an advanced and universal tool to high-efficiently deproteinize plant polysaccharides.
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高影响因子
LIQUID CRYSTALS
·
2019
·
IF 3.078
Peng Wei,Wei Zhang,Yifeng Zhang,Yanzhi Wang,Zheng Guo,Hongqin Yu,Yumin Xia,Yanping Wang,Yimin Wang
In this study, aromatic–aliphatic thermotropic copolyesters derived from p-hydroxybenzoic acid, p-hydroxycinnamic acid (HCA), terephthalic acid and polyethylene glycol (PEG) with different molecular weight (200, 400, 600) were directly synthesised via Vilsmeier adduct solution polymerisation method. The structure, thermal behaviour, liquid crystal property, hydrophylicity and photoactivity were investigated by Fourier transform infrared and nuclear magnetic resonance spectroscopy, differential scanning calorimeter, polarised optical microscopy, water contact angle measurement and ultraviolet (UV) spectrophotometer. The PEG incorporation ratio is 0.540–0.691 related to the HCA units, because of its low reactivity. And, the copolyesters have relatively low melting temperatures (96–107°C) and good hydrophylicity (water contact angle value 61.2–75.3°) as compared with wholly aromatic thermotropic copolyester. All of the copolyesters exhibited nematic liquid crystal behaviour and the stable mesophase temperature range was more than 60°C after being melted. The resulted copolyesters had enough thermal stability for melt processing without any degradation. The UV absorption intensities decreased with increased irradiation time, indicating that photocrosslinking occurred.
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高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Rui Wang,Xuexue Wang,Yijing Zhan,Zheng Xu,Zongqi Xu,Xiaohai Feng,Sha Li,Hong Xu
Novel sunscreen products based on bioadhesive/gel systems that can prevent the skin penetration behaviors of UV filters have attracted increasing attention in recent years. However, integration is very difficult to achieve and control on the wet surface of the skin under sweaty/dynamic physiological conditions, resulting in functional failure. Herein, we demonstrated the fabrication of a novel dual-network hydrogel sunscreen (DNHS) based on poly-γ-glutamic acid (γ-PGA) and tannic acid (TA), which demonstrated prominent UV protection properties across broad UVA and UVB regions (360–275 nm). Due to a three-dimensional network microstructure and a highly hydrated nature that mimics the extracellular matrix of natural skin, DNHS can perfectly match the skin surface without irritation and sensitization. In addition, the intermolecular hydrogen bond interactions of γ-PGA and TA provide an important driving force for coacervation, which endows the DNHS with remarkable self-recovery properties (within 60 s). Moreover, due to the multiple interfacial interactions between γ-PGA/TA and the protein-rich skin tissue surfaces, DNHS simultaneously possesses excellent skin-integration and water-resistance capacities, and it can be readily removed on demand. Our results highlight the potential of the DNHS to be used in next-generation sunscreens by providing long-term and stable UV protection functions even under sweaty/dynamic physiological conditions.
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高影响因子
ChemElectroChem
·
2020
·Vol. 7
·期 4
·928-936
·
IF 4.154
Yilun Wang,Dawei Gu,Jiaren Guo,Mingyang Xu,Hongshun Sun,Jishu Li,Lei Wang,Linjiang Shen
Graphical One step at a time : A stepwise cyclic voltammetry approach is proposed to construct the potential dependence of specific capacitance. The working voltage window and energy density of RuO 2 //RuO 2 supercapacitors (SCs) are maximized by modulating the mass ratio based on the relationship between specific capacitance and potential. The voltage window and energy density of RuO 2 //RuO 2 with m + /m − =3.03 reach 0.750 V and 4.81 Wh/kg, respectively. These values are 188 % and 304 % higher than those of RuO 2 //RuO 2 with a mass ratio of 0.56. The source of wasted potential window on the electrodes in RuO 2 //RuO 2 is explained in an effort to design and produce better SCs. In this study, a stepwise cyclic voltammetry approach was proposed to clarify the potential dependence of specific capacitance for reduced graphene oxide and ruthenium oxide electrodes. Based on the relationship between specific capacitance and potential, the working voltage window and energy density of RuO 2 //RuO 2 supercapacitors (SCs) were maximized by modulating the mass ratio. The working voltage window of RuO 2 //RuO 2 with a mass ratio of 2.03 (close to optimum mass ratio ) was extended by about 188 % when compared to that calculated at a mass ratio of 0.56. The former was equivalent to a 304 % increase in energy density. In addition, the source of wasted potential window of electrodes on RuO 2 //RuO 2 was investigated in an effort to design and produce better SCs.
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2020
·
IF 4.794
Yuping Chen,Zipeng Yang,Qianxin Zhang,Daijun Fu,Ping Chen,Ruobai Li,Haijin Liu,Yalan Wang,Yang Liu,Wenying Lv,Guoguang Liu
Tartaric acid (TA) is an important component of plant rhizosphere secretion, having a certain influence on the adsorption and desorption behavior of heavy metals in soil. Humin could serve as an environmentally compatible passivator of heavy metal in soil. The aims of this study were to simulate the adsorption of Pb (II) via humin in a soil solution, explore the effects of TA on the adsorption of Pb (II) by humin and elucidate the mechanism of its influence. The results indicated that the adsorption of Pb (II) on the surface of humin within and without TA was consistent with the Langmuir isotherm equation and the pseudo-secondary kinetic model (R 2 > 0.99). The effect of TA on adsorption was related to the concentration of TA. With the increasing of TA concentration, the adsorption of Pb (II) by humin showed a peak change and the adsorption amount reached the maximum with 0.5 mmol L −1 humin, is 192.31 mg L −1 with 0.1 mmol TA. Basing on adsorption experiments and characterization of FTIR, SEM, EDX and XPS. It revealed that the oxygenated groups of TA can be combined with humin by hydrogen bonding, in the low concentration TA (less than 0.5 mmol L −1 ), which is equivalent to an increment of the carboxyl group on the surface of humin, thus adsorption amount was increased. The increasing of the concentration of TA led to an increment of free TA in the solution, which would complex with the lead ions in the solution, and indirectly reduce the amount of Pb(II) adsorption on the humin.
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高影响因子
ACS Sustainable Chemistry & Engineering
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2019
·
IF 6.97
Yang Qin,Jinpeng Wang,Chao Qiu,Yao Hu,Xueming Xu,Zhengyu Jin
Metal–phenolic network (MPN) coatings have generated increased interest because of their facile fabrication and biocompatibility, especially for safe and nontoxic. How to synthesize a novel, safe, biodegradable, and biocompatible material to replace synthetic materials is of interest in fields of food, biomedicine, and material science. In this study, we successfully fabricated two series of novel and multifunctional-modified starch nanoparticles (MPN@DBS-NPs and MPN@SNCs) by introducing MPN coatings to debranched starch nanoparticles (DBS-NPs) or starch nanocrystals (SNCs) based on the reaction coordinates of the tannic acid (TA) and iron ions. The resulting MPN@DBS-NP and MPN@SNC, each with a spherical shape, measured approximately 75–95 and 110–125 nm in diameter, respectively. Moreover, these nanoparticles provided a negligible release of TA at both a neutral pH (7.4) and an alkaline pH (9.0), as well as a highly efficient release at physiologically relevant acidic pH levels (1.2, 3.0, and 5.0). By utilizing the unique nature of TA, the functionalized surface modification strategy provided the DBS-NP and SNC with excellent antioxidant bioactivity. Notably, significant effects against Gram-positive and Gram-negative bacteria were observed. Cell assays confirmed that MPN@DBS-NP exhibited nontoxicity and high biocompatibility. Together, the cytocompatibility, antioxidant, and antibacterial characteristics of the novel pH-sensitive-modified starch make them promising candidates for food and biomedical applications.
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高影响因子
Journal of Cleaner Production
·
2019
·
IF 6.395
Song Gao,Qinze Liu,Qiang Liu,Chengbing Yuan,Tingting Gao,Jinshui Yao
In this work, hollow globular Cr(VI)-adsorbents were successively fabricated via the assembly of tannic acid (TA) and 1, 6-hexanediamine (HA) converting to polymerization using polyvinyl alcohol (PVA) as precursor. PVA@poly(tannic acid - 1, 6-hexanediamine) (PVA@PTHA) with hollow structure can chelate Cr on their bodies accompanying of reduction of Cr(VI) to Cr(III) caused by phenolic hydroxyl groups, which is proved by means of TEM , XPS , SEM and EDX, etc . Many factors affecting the adsorption of Cr(VI) were studied systematically, i.e. , initial Cr(VI) concentration (20–260 mg/L), contact time (0–48 h), foreign ions (Cu 2+ , Fe 3+ , Mn 2+ ), and pH value (2–7). The adsorption-reduction process followed the Langmuir isotherm model (R 2 = 0.9994) and fitted well with the pseudo-second-order kinetic model (R 2 = 0.9984). Besides, the removal capabilities of PVA@PTHA for Cr(VI) were affected insignificantly by nitrate ion (NO 3 − ) or sulfate ion (SO 4 2− ) as a competitive ion. In brief, PVA@PTHA is low-cost green adsorbent with the maximum adsorption capacity of 434.0 mg/g for Cr(VI)-sewage treatment.
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高影响因子
Journal of Agriculture and Food Research
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2019
·
IF 0
Junmei Su,Yuan Sun,Zhenshun Li,Yang Chen,Baomiao Ding,Weiqing Sun
Lysozyme (Ly) is a good natural food preservative. However, its enzyme activity is easily influenced by food components, such as tannins. However, the specific mechanism is still unknown. In this study, tannic acid (TA) was used as model tannin to bind with Ly. The interactional properties of Ly-TA complexes were characterized with intrinsic fluorescence intensity, fourier transform infrared spectroscopy, circular dichroism and dynamic light scattering. The enzyme activities of Ly were analyzed by the lysis rate of Micrococcus lysodeikticus . The results indicated that TA can bind well with Ly through hydrophobic, hydrogen and electrostatic interactions, which induced the unfolding of Ly molecule. Consequently, the enzyme activity of Ly was inhibited for conformational changes and masking its active sites by TA, as well as the enzyme stability further declined in pH changes, thermal treatments and high salt concentrations. Our findings shed some light on the possible explanation of negative effects from tannins on the activity of Ly in plant foods.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2019
·
IF 2.931
Pei Yang,Ziqi Zhu,Minzhi Chen,Xiaoyan Zhou,Weimin Chen
A facile and straightforward microwave-assisted method was used to prepare polyamine-functionalized carbon dots (CDs) from a precursor comprising renewable xylan and branched polyethyleneimine (BPEI). The as-prepared BPEI-CDs were monodispersed sphere particles with an average diameter of about 8.62 nm, and exhibited excellent fluorescent property and high stability, as well as excitation-independent emission behavior. Furthermore, it is attractive that the BPEI-CDs can be used as novel fluorescent probes for detecting tannic acid (TA) sensitively and selectively. At the optimum condition, the TA detection system was established in water solution and ethanol solution with a dynamic range from 0.1 to 5 μM, and their detection limit of 36.8 nM and 44.9 nM were also determined, respectively. Most importantly, the BPEI-CDs-based sensors can be successfully applied to detect TA in real lake water and white wine samples, suggesting the low-cost and excellent BPEI-CDs are potential suitable for TA detection in practical application.
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高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Haiyan Qiao,Pengfei Qi,Xiaohui Zhang,Linan Wang,Yeqiang Tan,Zhaohui Luan,Yanzhi Xia,Yanhui Li,Kunyan Sui
Herein, we demonstrate a ternary ionic hydrogel sensor consisting of tannic acid, sodium alginate, and covalent cross-linked polyacrylamide as skin-mountable and wearable sensors. Based on the multiple weak H-bonds and synergistic effects between the three components, the as-prepared hybrid hydrogel exhibits ultrastretchability with high elasticity, good self-healing, excellent conformability, and high self-adhesiveness to diverse substrates both in air and underwater. More importantly, the ternary hydrogel exhibits high strain sensitivity especially under subtle strains with a gauge factor of 2.0, which is close to the theoretical value of the ionic hydrogel sensors; an extremely large workable range of strain (0.05–2100%); and a low operating voltage 0.07 V. Consequently, the sensor demonstrates superior sensing performance for real-time monitoring of the large and subtle human motions, including limb motions, swallowing, smiling, and wrist pulse. Therefore, it is believed that the STP hydrogel has great potential applications in health monitoring, smart wearable devices, and soft robots.
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高影响因子
International Journal of Environmental Research and Public Health
·
2019
·Vol. 16
·期 12
·2187
·
IF 2.468
Yue Teng,Zhiying Liu,Ke Yao,Wenbin Song,Yongjun Sun,Hailing Wang,Yanhua Xu
The use of attapulgite (ATP)-based materials for adsorption of pollutants from water and wastewater has received growing attention. However, recovering ATP-based adsorbents remains a challenge. In this study, a magnetic adsorbent ATP/CoFe2O4with high tannic acid (TA) adsorptive capacity was fabricated via a facile co-precipitation approach and was well characterized. The loaded CoFe2O4particles were embedded into the adsorbent surfaces to allow magnetic separability. For this material, its TA adsorption kinetics, isotherm behavior, and magnetic separation efficiency are reported. The developed magnetic composites had rapid sorption kinetics of 3 h, high sorption capacity of 109.36 mg/g, and good magnetic separation efficiency of 80%. The used ATP/CoFe2O4was successfully regenerated by NaOH and reused five times without a substantial reduction in TA removal and magnetic performance. Intermolecular hydrogen bonding formation and surface complexation were identified as the sorption mechanisms of TA by ATP/CoFe2O4.Keywords:attapulgite;adsorption;CoFe2O4magnetic nanoparticle;tannic acid
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高影响因子
危险品化学品经营许可证（带存储）