LANGMUIR
·
2014
·
IF 4.384
Wenbo Zhao,Kuai Wang,Yuan Wei,Yinghui Ma,Lingling Liu,Xiaohua Huang
In this work, three kinds of nanostructured silica–phytic acid (SiO2–PA) materials with diverse morphologies including spherical SiO2–PA (s-SiO2–PA), rod-like (r-SiO2–PA), and helical SiO2–PA (h-SiO2–PA) were prepared with the help of electrostatic interaction. The SiO2–PA nanomaterials with different morphologies were characterized by using transmission electron microscopy (TEM), Fourier transform infrared (FTIR), electrochemical impedance spectroscopy (EIS), and circular dichroism spectrum (CD). Diverse morphologies of SiO2–PA were used as electrode decorated materials to achieve a high efficiency for electrochemical dopamine (DA) detection. The laccase biosensors were fabricated by immobilizing different morphologies of SiO2–PA nanomaterials and laccase onto the glassy carbon electrode (GCE) surface, successively. Then the electrochemical responses of the different morphologies of nanostructured SiO2–PA nanomaterials to laccase were discussed. Results indicated that compared to laccase/s-SiO2–PA and laccase/r-SiO2–PA, the laccase/h-SiO2–PA-modified electrode showed the best electrochemical performances.
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Nanoscale
·
2015
·Vol. 8
·期 3
·1555-1564
·
IF 7.394
Xiang Gao,Ke Lu,Lei Xu,Hua Xu,Haifeng Lu,Feng Gao,Shifeng Hou,Houyi Ma
A novel, highly effective and environmentally friendly film-forming material, phytic acid (PA)/silane (denoted as PAS) hybrid with a three-dimensional (3D) network structure, was prepared through a condensation reaction of PA with methyltrihydroxysilane generated from the hydrolysis of methyltriethoxysilane (MTES). Two kinds of PAS-based pretreatment layers, namely NaBrO3-free and NaBrO3-doped PAS layers, were fabricated on iron substrates using the dip-coating method. SEM and AFM observations showed that the as-fabricated PAS-based layers possessed a 3D porous microstructure at the nanoscale and a rough surface morphology. X-ray photoelectron spectroscopic (XPS) and attenuated total reflection infrared (ATR-IR) spectroscopic characterization demonstrated that the above PAS layers bound to the iron surface via the –P–O– bond. Moreover, analyses of steady-state polarization curves and electrochemical impedance spectroscopic (EIS) data indicated that the corrosion rates of the iron substrates decreased considerably in the presence of the two PAS-based pretreatment layers. In particular, the NaBrO3-dosed PAS layer displayed the better corrosion resistance ability as well as maintaining the original microstructure and surface morphology. The PAS-based pretreatment layers are expected to act as substitutes for chromate and phosphate conversion layers and will find widespread application in the surface pretreatment of iron and steel materials due to the advantages of being environmentally friendly, the rapid film-forming process, and, especially, the nanoporous microstructure and rough surface morphology.
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JOURNAL OF CEREAL SCIENCE
·
2015
·
IF 2.094
Jia Guo,Yuan-Yuan Bian,Ke-Xue Zhu,Xiao-Na Guo,Wei Peng,Hui-Ming Zhou
Wheat bran is good for human health due to the abundance of dietary fiber. However, it also contains much phytate which has been well documented as an anti-nutritional factor. This study is the first to explore the effectiveness of reducing phytate content in wheat bran by directly removing the aleurone cell content utilizing different roller mills (smooth roller, coarse smooth roller and teeth roller) and different clean-up methods (brushing and ultrasonic washing). Through analysis of phytate content in wheat bran obtained from different mill systems, the best raw material was found to be obtained from the 5B system. By investigating various roller types and clean-up methods, the optimal technique was found to use a teeth roller mill combined with ultrasonic washing, which could reduce the phytate content by the greatest amount: the reduction of phytate content achieved 62.98% (from 26.80 mg/g to 9.92 mg/g) in wheat bran. The optical microscope observation indicated that ultrasonic washing could wash the aleurone cell content out from broken aleurone cells which were destroyed by the teeth roller mill.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Kuai Wang,Pengcheng Liu,Yuhang Ye,Juan Li,Wenbo Zhao,Xiaohua Huang
The development of novel nanomaterials for the ultra-sensitive detection of biological species has received great attention. Herein we report the design and synthesis of phytic acid functionalized silica nanoparticles (SiO 2 -PA NPs) and their biomedical sensor application for sensitive detection of dopamine. The SiO 2 -PA NPs were characterized by transmission electron microscopy (TEM) and Energy dispersive X-ray spectrometer (EDS). The biocompatibility between SiO 2 -PA NPs and laccase was also investigated by circular dichroism (CD) spectra. Moreover, the novel laccase biosensor based on SiO 2 -PA NPs for sensitive detection of dopamine (DA) was fabricated, and the electrochemical properties of this laccase biosensor were investigated. The results showed the biosensor had good electrocatalytic activity toward DA with a wide linear range (0.99–103.10 μM) and a low detection limit 0.26 ± 0.003 μM. It can be attributed to the good biocompatibility and nano-effect of SiO 2 -PA NPs. The biosensor was successfully tested for determination of DA in pharmaceutical and rabbit blood serum samples. The development of biomimetic materials science will offer a novel platform for application to substance detection.
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CORROSION SCIENCE
·
2013
·
IF 3.615
Yingqi Chen,Guojiang Wan,Juan Wang,Sheng Zhao,Yuancong Zhao,Nan Huang
Magnesium-based materials are promising in biodegradable implants, but the proper corrosion control is a challenge. Phytic acid has potential as a coating on Mg to control the degradation rate. An alkaline pre-treatment process is implemented to form the hydroxyl group on the Mg surface and covalently immobilize phytic acid. The surface-immobilized phytic acid molecules chelate with Mg to form a dense and homogenous protective coating. The coated Mg exhibits a smaller corrosion current density and degradation rate as compared to bare Mg in the phosphate buffered saline.
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PHYSICA B-CONDENSED MATTER
·
2014
·
IF 1.276
Chao Yang,Haodao Mo,Limin Zang,Jianhui Qiu,Eiichi Sakai,Xueli Wu
The conductive polymers with unique nanostructures have attracted intense interest due to their potential application. Here the well-defined polypyrrole nanoparticles were facile fabricated via the facile chemical oxidative polymerization of pyrrole with high feeding ratio of phytic acid. Phytic acid is a renewable resource and a natural carbohydrate compound with a vast number of phosphate groups from plant which was used as the template and dopant for the nanostructured conductive polymer for the first time. The samples exhibit the well-defined nanoparticles observed by scanning electron microscope (SEM) and atomic force microscope (AFM). The PPy nanoparticles were achieved and outstanding electrical conductivity as high as 5263 S m −1 was obtained with the feeding mass ratio of phytic acid: pyrrole=3:7. Furthermore, the polypyrrole nanoparticles were characterized with Fourier transform infrared (FTIR), thermogravimetric analysis (TGA), and electrical conductivity techniques.
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TALANTA
·
2017
·
IF 4.162
Qi Wang,Qian Zhou,Qicheng Zhang,Rongjia Shi,Shangshang Ma,Wenbo Zhao,Min Zhou
Preparation of high performance electrochemical biosensing interface for the sensitive and rapid detection of human metabolites is of great interest for health care and biomedical science. In this paper, based on the adhesion technique of marine mussels, we designed and prepared a novel biosensor with a micro/nano-biointerface of Fe 3 O 4 -Mn 3 (PO 3 ) 2 @Ni foam, which offered a three dimensional (3D) living environment for real cell. The constructed biosensor with a 3D micro/nano-biointerface of Fe 3 O 4 -Mn 3 (PO 3 ) 2 @Ni foam was characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and elemental mapping. Furthermore, the electrochemical experiments by electrochemical method for detection of superoxide anion (O 2 •− ) in situ released by cells were carried out by this biosensor we proposed. Results indicated that the 3D interface of mussel-inspired Fe 3 O 4 -Mn 3 (PO 3 ) 2 @Ni foam offered an amicable platform for promoting cell adhesion, which was beneficial for enhancing biosensing activity. This proposed sensing platform provided high electroactivity and excellent electron transport with a lower detection limit (0.0170 μM), wider linear range 0.04–2.44 μM) and short diffusion distance to reaction sites. The case achieved the accurate detection of O 2 •− (in situ released by cells) based on the combination of mussel-inspired biomimetic adhesion technique, 3D micro/nano-biointerface construction and electrochemical biosensing technique.
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 10
·3773-3779
·
IF 4.58
Wu Juanjuan,Liang Xinyu,Hao Lin,Wang Chun,Wu Qiuhua,Wang Zhi
A nanocomposite (designated as PAG) possessing amphiphilic properties was prepared by a single-step method from graphene oxide and phytic acid, in which phytic acid acts as both an inducer and cross-linking agent. The morphology and microstructure of PAG were characterized by nitrogen adsorption, scanning electron microscopy and transmission electron microscopy. The PAG possess a 3 dimensional network structure with interpenetrated nano- and micropores and represent a viable adsorbent for solid-phase extraction of carbamate pesticides prior to their quantitation by high performance liquid chromatography. Under optimum conditions, the calibration plot is linear in the 0.5 to 80 ng g −1 concentration range in case of apple samples, and in the 1.0 to 80 ng mL −1 range for juice samples. The respective limits of detection (for S / N = 3) are between 0.05 and 0.1 ng g −1 , and between 0.2 and 0.3 ng mL −1 . The PAG has a high adsorption capability, and in our preception it may become a useful adsorbent for the preconcentration of other organic pollutants.
A amphiphilic nanocomposite (prepared from phytic acid and graphene oxide; denoted as PAG) was prepared by a single-step method. Phytic acid acts as both an inducer and cross-linking agent. The PAG was used as an adsorbent to extract carbamates from apple and juice samples.
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CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Hongxiu Dai,Nan Wang,Donglei Wang,Houyi Ma,Meng Lin
An electrochemical sensor was developed for detecting heavy metal ions by using a phytic acid functionalized polypyrrole (PPy)/graphene oxide (GO) modified electrode. PPy/GO nanocomposites were synthesized by in situ chemical oxidation polymerization. The PPy/GO nanocomposites were functionalized with phytic acid (PA) molecules by electrostatic attraction. The structural features of the fabricated nanocomposites were confirmed by transmission electron microscopy (TEM), attenuated total reflection infrared (ATR-IR) spectroscopy and Raman spectroscopy. The PA/PPy/GO modified electrode exhibited high electrochemical conductivity, and produced a remarkable increase in peak current compared with the PPy/GO and PA/GO modified electrodes. The developed sensor was used for the electrochemical analysis of various trace metal ions by differential pulse voltammetry (DPV). The modified electrode demonstrated to measure Cd(II) and Pb(II) with a linear working range of 5–150 μg/L. This work demonstrated a simple, rapid and high performing electrochemical strategy for high-sensitivity detection of heavy metal ions.
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Scientific Reports
·
2016
·Vol. 6
·期 1
·1-9
·
IF 5.228
Shen Xiaohui,Wang Qi,Liu Yuhong,Xue Wenxiao,Ma Lie,Feng Shuaihui,Wan Mimi,Wang Fenghe,Mao Chun
Quantitative analysis of superoxide anion (O 2 ·− ) has increasing importance considering its potential damages to organism. Herein, a novel Mn-superoxide dismutase (MnSOD) mimics, silica-manganous phosphate (SiO 2 -Mn 3 (PO 4 ) 2 ) nanoparticles, were designed and synthesized by surface self-assembly processes that occur on the surface of silica-phytic acid (SiO 2 -PA) nanoparticles. The composite nanoparticles were characterized by fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), scanning electronic microscopy (SEM), electron diffraction pattern, energy dispersive spectroscopy (EDS) and elemental mapping. Then the electrochemical measurements of O 2 ·− based on the incorporation of SiO 2 -Mn 3 (PO 4 ) 2 onto the surface of electrodes were performed and some satisfactory results were obtained. This is the first report that manganous phosphate (Mn 3 (PO 4 ) 2 ) nanoparticles with shape-controlled, but not multilayer sheets, were utilized for O 2 ·− detection. The surface self-assembly technology we proposed will offer the ideal material to construct more types biosensor and catalytic system for its nanosized effect.
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SURFACE & COATINGS TECHNOLOGY
·
2017
·
IF 2.589
Xiang Gao,Weihua Li,Ru Yan,Huiwen Tian,Houyi Ma
Phytic acid conversion coating and Zn 2 + doped phytic acid conversion coating were fabricated on Q235 steels by immersing the steel samples in corresponding coating bath for 600 s. The changes of coating formation process and adsorption action of phytic acid on steel surface due to addition of Zn 2 + in coating bath were investigated. Scanning electron microscopy images exhibited that phytic acid conversion coating was porous network structure consisting of needle-like crystals, but Zn 2 + doped phytic acid conversion coating was one uniform layer except some fine cracks. Energy dispersive spectroscopic, X-ray diffraction and X-ray photoelectron spectroscopic characterizations demonstrated that the roles of Zn 2 + during the coating formation process could conclude to two sides: (i) Zn 2 + could promote the adsorption reaction of phytic acid to form one thicker phytic acid conversion coating on steel surface; (ii) a part of Zn 2 + could form ZnO and aggregation of the complex of phytic acid, Zn and Fe and doped to the formed conversion coatings. And the electrochemical measurements results showed that the corrosion protection efficiency of Zn 2 + doped phytic acid conversion coating was higher than that of phytic acid conversion coating.
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ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Xiaming Feng,Xin Wang,Wei Cai,Shuilai Qiu,Yuan Hu,Kim Meow Liew
Practical application of functionalized graphene in polymeric nanocomposites is hampered by the lack of cost-effective and eco-friendly methods for its production. Here, we reported a facile and green electrochemical approach for preparing ferric phytate functionalized graphene (f-GNS) by simultaneously utilizing biobased phytic acid as electrolyte and modifier for the first time. Due to the presence of phytic acid, electrochemical exfoliation leads to low oxidized graphene sheets (a C/O ratio of 14.8) that are tens of micrometers large. Successful functionalization of graphene was confirmed by the appearance of phosphorus and iron peaks in the X-ray photoelectron spectrum. Further, high-performance polylactic acid/f-GNS nanocomposites are readily fabricated by a convenient masterbatch strategy. Notably, inclusion of well-dispersed f-GNS resulted in dramatic suppression on fire hazards of polylactic acid in terms of reduced peak heat-release rate (decreased by 40%), low CO yield, and formation of a high graphitized protective char layer. Moreover, obviously improvements in crystallization rate and thermal conductivities of polylactic acid nanocomposites were observed, highlighting its promising potential in practical application. This novel strategy toward the simultaneous exfoliation and functionalization for graphene demonstrates a simple yet very effective approach for fabricating graphene-based flame retardants.
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危险品化学品经营许可证（带存储）