Analytical Methods
·
2018
·Vol. 11
·期 2
·171-178
·
IF 2.073
Renxuan Liu,Tao Sha,Bei Nie
In vivo analyzing chemical significance under human skin has impinged a formidable challenge upon regular optical methods due to its intrinsic opaque property. With analogy to a needle biopsy, conceptually and practically, here, we fabricated a “needle-like” nanopore-embellished TiO2 column through electrochemistry directed etching, intriguingly serving as hundreds of thousands of liquid containers, perpendicular to the needle axle. A silver nanostructure synthesized in situ within the nanotube array gives rise to an opportunity for enhanced Raman detection to profile the extracts with excellent sensitivity and considerable spatial resolution, delineating the molecular information in depth. This SERS-active needle, which combined the functions of liquid biopsy and optical detection can penetrate the upper skin layer with minimal invasion and obviation of the extra step for the mass-limited sample transferring, unraveling the chemical insights underneath the opaque materials.
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Soft Matter
·
2019
·Vol. 15
·期 38
·7686-7694
·
IF 3.399
Mengmeng Shu,Shijun Long,Yiwan Huang,Dapeng Li,Haiyan Li,Xuefeng Li
We report a simple and facile self-assembly approach to fabricate polyelectrolyte complex (PEC) hydrogel films with positively charged chitosan (CS) and negatively charged heparin sodium (HS) by combining hydrogen bonding and electrostatic interactions. The CS/HS hydrogel films exhibited excellent tensile strength and toughness, good self-recovery ability, superior water absorbency, and pH-dependent surface charge characteristics. The gelation mechanism was investigated by zeta potential measurements. The CS/HS hydrogel films exhibited high antibacterial efficacy against E. coli at selected pHs or when coordinated with various metal ions and a significant effect on accelerating wound healing. The self-assembly approach presented in this work may serve as a generic strategy for the fabrication of novel multi-functional PEC hydrogels for broad biomedical applications.
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BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Xiaoyu Ma,Zhen Gao,Ming Gao,Chuanfu Wu,Qunhui Wang
This study aimed to clarify the composition changes of food waste after being placed for few days and propose a two-stage fermentation method to effectively convert food waste saccharified liquid (FWSL) into lipids by Rhodosporidium toruloides . Food waste generally needs 3–5 days to be transported and stored before treatment. The lactic acid concentration of FWSL produced from 5-days-placed-at-room-temperature food waste reached to 15 g/L. Lactic acid promoted yeast proliferation, and its main mechanism was the conversion of lactic acid into pyruvic acid, which could provide energy for yeast growth through TCA cycle. The optimal lipid concentration in the two-stage fermentation reached to 9.19 g/L, and lipid yield amounted to 0.204 g lipid/g total sugar; the values increased by 44.27% and 60.63%, respectively, when compared with those in traditional fermentation. This study could provide a strategy for food waste treatment closer to industrial production.
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COLLOID AND POLYMER SCIENCE
·
2019
·Vol. 297
·期 5
·705-717
·
IF 1.906
Yan Qing,Liu Lulu,Wang Ting,Wang Henan
An interpenetrating double network hydrogel based on cellulose backbone and poly-dopamine dendritic structure was successfully prepared with the advantages of controlled hydrophobic drug loading, pH-responsive ability, and long-term bacteriostatic property. 13 C-NMR was used to process the structural characterization and explain the mechanism of hydrogel system’s construction. Hydrophobic drug of ciprofloxacin with carbonyl group can evenly carry in the hydrogel system, and the highest loaded ratio of ciprofloxacin was reach to 80.56%. Besides, the swelling property and the controlled drug loading ability of our prepared hydrogel were carefully studied, which showed a close relation with the hydrogel design. Moreover, the in vitro drug release experiments demonstrated that the hydrogel had an obvious pH-responsive release property of ciprofloxacin, and the result of bacteriostatic experiment also showed a long-term bacteriostatic effect on Escherichia coli , which showed potential application on biological and medical fields, including wound treatment.
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EUROPEAN POLYMER JOURNAL
·
2018
·
IF 3.741
Jianhui Wu,Chunhua Wang,Changdao Mu,Wei Lin
We report a novel environmental friendly waterborne polyurethane (WPU) coating with good anti-bacterial adhesion property and hydrophobicity. A key point of our approach is to functionize the polyurethane with isobornyl acrylate (IBA), a widely used natural material with unique chiral feature and good biocompatibility. The polyurethanes containing IBA have been synthesized by thiol-ene Michael addition reaction and poly-addition polymerization. The thiol monomer 3-mercapto-1,2-propanediol (TPG) and vinyl monomer isobornyl acrylate (IBA) have been used to obtain dihydroxy-terminated IBA (IBA(OH) 2 ) with triethylamine as catalyst. The structure of IBA(OH) 2 have been identified by Fourier transform infrared spectrum (FTIR), proton nuclear magnetic resonance ( 1 H NMR), and mass spectrometry (MS). IBA(OH) 2 is then incorporated into polyurethane as a chain extender to yield a WPU with IBA side group (IWPU). The synthesized IWPU has been confirmed by FTIR, 1 H NMR, X-ray photoelectron spectroscopy (XPS), and gel permeation chromatography (GPC). Thermogravimetric Analysis (TGA) measurements indicate that the thermal stability of IWPU is decreased slightly with the increasing content of IBA(OH) 2 . Differential scanning calorimetry further (DSC) indicate that the T g of the IWPU coatings decreases, and the resistance to low temperature increases at a higher content of IBA(OH) 2 .The introduction of IBA side groups can improve the hydrophobicity of the polyurethane, which is favorable for wide application of the coatings. Additionally, the antibacterial adhesion performance of the polyurethanes has been evaluated by plate count method and optical density ( OD ) test. The results demonstrate that the polyurethane coatings with 25 wt% content of IBA side groups can exhibit effective resistance to bacterial adhesion, with the inhibition ratios of 89.3% and 80.4% for E. coli and S. aureus , respectively.
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MOLECULES
·
2018
·Vol. 23
·期 7
·1821
·
IF 3.098
Yejing Wang,Rui Cai,Gang Tao,Peng Wang,Hua Zuo,Ping Zhao,Ahmad Umar,Huawei He
Silk sericin is a protein from a silkworm’s cocoon. It has good biocompatibility, hydrophilicity, bioactivity, and biodegradability. However, sericin could not be used in biomedical materials directly because of its frangible characteristic. To develop multifunctional sericin-based materials for biomedical purposes, we prepared a sericin/agar (SS/agar) composite film through the blending of sericin and agar and repetitive freeze-thawing. Then, we synthesized silver nanoparticles (AgNPs) in situ on the surface of the composite film to endow it with antibacterial activity. Water contact angle, swelling and losing ratio, and mechanical properties analysis indicated that the composite film had excellent mechanical property, hydrophilicity, hygroscopicity, and stability. Scanning electron microscopy and X-ray photoelectron spectroscopy analysis confirmed the successful modification of AgNPs on the composite film. X-ray powder diffraction showed the face-centered cubic structures of the AgNPs. This AgNPs modified composite film exhibited an excellent antibacterial capability againstEscherichia coliandStaphylococcus aureus. Our study develops a novel AgNPs/sericin/agar composite film with enhanced mechanical performance and an antimicrobial property for potential biomedical applications.Keywords:silk sericin;agar;silver nanoparticles;antimicrobial activity
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Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 32
·8812-8822
·
IF 5.976
Peitao Xie,Hongyu Li,Biao He,Feng Dang,Jing Lin,Runhua Fan,Chuanxin Hou,Hu Liu,Jiaoxia Zhang,Yong Ma,Zhanhu Guo
A bio-gel derived strategy was used to construct Ni/C nanocomposites consisting of three-dimensional (3-D) carbon networks with embedded nickel nanoparticles. The amorphous carbon prevents agglomeration of the nickel nanoparticles and thus contributes to a good impedance match. The microwave absorption properties of the Ni/C nanocomposites were optimized according to percolation theory for good impedance matching. As a result, microwave absorbing coatings, which have the advantages of thin thickness (1.75 and 1.5 mm) and light weight (25 and 30 wt%), were achieved with excellent absorbing properties (90% microwave absorption) and a broad bandwidth (13.6–18 GHz and 13.2–18 GHz). The absorbing properties were mainly attributed to the dielectric relaxation processes at 2–18 GHz from the multilevel interface, porous carbon materials and nanoscale nickel nanoparticles in the Ni/C nanocomposites. It is believed that this work not only helps to elucidate the mechanism of absorption but also provides a new design paradigm for determining the optimal content of absorbers using percolation theory. The bio-gel derived strategy paves a possible way for the mass synthesis of microwave absorbers.
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JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Xiangrui Meng,Yijin Mi,Dongling Jia,Ning Guo,Yarui An,Yuqing Miao
Co hydroxide polymorphs (green α-Co(OH) 2 , red β-Co(OH) 2 and brown β-Co(OH) 3 ) formed at separate positions in a test-tube. Diffusion of hydrazine hydrate downward in agar gel facilitated the reaction between hydrazine and Co 2+ leading a dilatational wave of reactant concentration. The resulting periodic Liesegang bands of α-Co(OH) 2 were observed due to the diffusion hindrance of reactants. It can be deduced that the high concentration of Co 2+ causes formation of α-Co(OH) 2 while the low concentrations produce β-Co(OH) 2 . β-Co(OH) 2 is oxidized readily to form brown β-Co(OH) 3 at the upper area of agar gel with high alkali condition and O 2 distribution. This study is helpful to learn the formation of more than one product and prepare multiple materials in single chemical reaction system. In addition, the obtained α-Co(OH) 2 has been stabilized in the gel medium for at least 3 months. It may facilitate its application in many areas especially in electrochemical area since α-Co(OH) 2 typically exhibits higher conductivity and electrocatalysis than β-Co(OH) 2 while in the past its application often is limited by thermodynamically instability.
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TEXTILE RESEARCH JOURNAL
·
2019
·
IF 1.613
Lu Wang,Chenmeizi Wang,Qingle Zhang,Jianhua Liu,Xin Xia
As new bio-based sustainable materials, this paper made a comparative study on the phloem and straw of Apocynum venetum. The cellulose nanofibers (CNFs) of Apocynum venetum phloem and straw were prepared by the acid hydrolysis method, and then different parts and proportions of poly (lactic acid) (PLA)/CNF films were prepared via electrospinning, respectively. The results revealed the CNF with longer length and finer diameter network structure can be separated by straw, while the short nanostructure of the rod-like structure can be separated by phloem. It was also shown that the wettability and permeability of PLA improved significantly by adding these two kinds of CNFs, the water contact angle of PLA decreased from 130° to 101° and the permeability was up to 4658 g/(m2•d). As for antibacterial properties, the antibacterial rate of CNF from straw proved slightly better than that from phloem against E.coli, reaching more than 90%. It proved that the CNF from straw showed excellent performance as phloem, providing a novel material for the preparation of CNFs, which can be naturally antibacterial and environment-friendly. The obtained PLA/CNF films could be potentially applied in antibacterial medical dressings.
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BIOTECHNOLOGY AND BIOENGINEERING
·
2017
·Vol. 115
·期 1
·60-69
·
IF 4.481
Gang Liu,Qiang Zhang,Hongxing Li,Abdul S. Qureshi,Jian Zhang,Xiaoming Bao,Jie Bao
Despite the well-recognized merits of simultaneous saccharification and co-fermentation (SSCF) on relieving sugar product inhibition on cellulase activity, a practical concomitance difficulty of xylose with inhibitors in the pretreated lignocellulose feedstock prohibits the essential application of SSCF for cellulosic ethanol fermentation. To maximize the SSCF potentials for cellulosic ethanol production, a dry biorefining approach was proposed starting from dry acid pretreatment, disk milling, and biodetoxification of lignocellulose feedstock. The successful SSCF of the inhibitor free and xylose conserved lignocellulose feedstock after dry biorefining reached a record high ethanol titer at moderate cellulase usage and minimum wastewater generation. For wheat straw, 101.4 g/L of ethanol (equivalent to 12.8% in volumetric percentage) was produced with the overall yield of 74.8% from cellulose and xylose, in which the xylose conversion was 73.9%, at the moderate cellulase usage of 15 mg protein per gram cellulose. For corn stover, 85.1 g/L of ethanol (equivalent to 10.8% in volumetric percentage) is produced with the overall conversion of 84.7% from cellulose and xylose, in which the xylose conversion was 87.7%, at the minimum cellulase usage of 10 mg protein per gram cellulose. Most significantly, the SSCF operation achieved the high conversion efficiency by generating the minimum amount of wastewater. Both the fermentation efficiency and the wastewater generation in the current dry biorefining for cellulosic ethanol production are very close to that of corn ethanol production, indicating that the technical gap between cellulosic ethanol and corn ethanol has been gradually filled by the advancing biorefining technology.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 12
·1-10
·
IF 5.3
Duan Xiaoge,Shi Xinrui,He Zhaoyuan,Chen Hongcai,Shi Zhuanzhuan,Zhao Zhi,Chen Hailan,Yu Meiling,Guo Chunxian
Escherichia coli ( E. coli ) O157:H7 is an important food-borne pathogen that can cause hemorrhagic diarrhea and enteritis in humans and animals. Realizing the rapid quantitation of E. coli O157:H7 is of great significance for the guarantee of food safety and disease control. In this study, an electrochemical immunosensing technique based on a functionalized composite of Cu-metal organic framework (Cu-MOF) and poly (3,4-ethylenedioxythiophene)-poly (styrenesulfonate) (PEDOT:PSS) is developed, achieving rapid and sensitive quantitation of E. coli O157:H7 in food and clinical feces samples. The organic functionalization of Cu-MOF significantly improves the interface conductivity to facilitate electron transfer and provides the sulfonic groups (–SO 3 H) to conjugate bio-recognizing elements for target determination. The immunosensor delivers a linear detection range of 3 × 10 2 ~ 3 × 10 8 cfu/mL, a low limit of detection (LOD) of 7.4 cfu/mL, and a short analysis time of 40 min. In addition, it does not show any cross-reactivity with other common pathogens and exhibits high repeatability with relative standard deviations (RSDs) all lower than 2.09%, providing a promising approach for warranting food safety and control of E. coli O157:H7 disease. Graphical Abstract
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Environmental Science-Water Research & Technology
·
2024
·
IF 3.5
Qin Long,Haonan Wu,Junfeng Li,Yuting Lin,Xiaoqing Zhou,Yi Huang,Peicong Zhang,Qin Zou,Rui Zhang
Effectively removing emulsions and dyes simultaneously from the mixed wastewater is challenging. In this study, we chose wood fiber as a supporting material. ZnO was uniformly grown on the surface of the wood fiber by a one-step hydrothermal method. After freeze-drying, ZnO/wood fiber composite was successfully created, which was kelp-shaped wood fiber (width dimensions of 25-50 μm) loaded with short rod-shaped ZnO (diameter dimensions of 5-25 nm and length dimensions of 15-100 nm). The composite was hydrophilic and oleophobic and had excellent antibacterial characteristics (>99.94%). The effectiveness of the composite in the separation of oil-in-water emulsions stabilized with a surfactant could reach 99.31%, owing to the ZnO enhanced emulsion breaking and separation capabilities. In addition, ZnO may interact electrostatically with dye molecules, allowing for 99.92% efficiency in dye adsorption during emulsion separation. Then, ZnO provided ZnO/wood fiber composite photocatalytic degradation of dyes, which allowed for repeated recycling of ZnO/wood fiber composite, resulting in 98.80% emulsion interception and 99.90% dye removal after five cycles. The environment friendly ZnO/wood fiber composite has remarkable multifunctionality for emulsion separation, dye adsorption, self-cleaning, and antibacterial properties, which provides a novel treatment option for mixed emulsion and dye wastewater.
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