MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 3
·1-13
·
IF 5.3
Wang Yutong,Liu Yizhi,Liang Xiao,Liu Zhiyuan,Yang Yaling
This study successfully developed a colorimetric/SERS dual-mode sensor for determining acrylamide in baked goods based on the excellent peroxidase-like activity and Raman activity of Fe-PHS@Au–Ag-Au Janus NPs. In colorimetric mode, the thiol-ene Michael addition between acrylamide (AA) and glutathione (GSH) efficiently eliminates GSH-induced peroxidase-like activity inhibition. The peroxidase-like activity of Fe-PHS@Au–Ag-Au Janus NPs gradually recovered, and the blue color of the solution gradually deepened with the increase in AA dosage. In surface-enhanced Raman spectroscopy (SERS), Apt-Fe-PHS@Au–Ag-Au Janus NPs can selectively capture AA and bind specifically, leading to the dissociation of Apt and Fe-PHS@Au–Ag-Au Janus NPs. The Raman activity of Apt-Fe-PHS@Au–Ag-Au Janus NPs decreases due to the dissociation of Apt. The dual-mode sensor was utilized for the determination of acrylamide in the concentrations range from 0.05 to 20 µg·L −1 with detection limits of 0.06 µg·L −1 (SERS) and 0.01 µg·L −1 (colorimetric). The recovery in baked samples was between 91.0 and 108.0%. Graphical
研究领域:
食品科学
·
分析化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Ziyi Guo,Cuizhu Ye,Yi Shen
Nitrate reduction reaction (NO 3 - RR), an emerging technology for clean and efficient nitrate removal, is of great significance to reduce water pollution. In this study, NO 3 - RR activity was assessed on the copper foils, and the effects of various variables including initial pHs, temperatures, and nitrate concentrations on the NO 3 - RR were investigated. The copper foils displayed excellent NO 3 - RR activity with a high ammonium selectivity of 45% at pH = 1 and a conversion rate of 55% at pH = 13. The conversion of nitrate to nitrite was the rate determining step at pH = 7 and pH = 13. Oxalic ions displayed significant inhibition effects on NO 3 - RR by copper foils in the acidic and alkaline electrolytes. In particular, the inhibition effect of oxalate ions on NO 3 - RR approached to 50% with a nitrate/oxalate ratio of 2:1 in acidic media, which is likely attributed to the formation of complexes between oxalate ions and the copper surface. Such an inhibition effect is not noted in the neutral electrolyte. Structural characterizations including atomic force microscopy, Raman spectroscopy and Fourier transform infrared spectroscopy elucidated that the oxalate ions occupied a large number of the copper sites on the surface of copper foil to form competitive adsorption with nitrate. The experimental parameters for NO 3 - RR by copper foils were comprehensively analyzed, affording new insights on the complex interactions between the copper, nitrate, and oxalate.
研究领域:
环境科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Leyi Fang,Xiao-Tong Pan,Kang Liu,Dechen Jiang,Deju Ye,Li-Na Ji,Kang Wang,Xing-Hua Xia
The simultaneous and accurate detection of intracellular pH (pHi) and extracellular pH (pHe) is essential for studying the complex physiological activities of cancer cells and exploring pH-related therapeutic mechanisms. Here, we developed a super-long silver nanowire-based surface-enhanced Raman scattering (SERS) detection strategy for simultaneous sensing of pHi and pHe. A surface-roughened silver nanowire (AgNW) with a high aspect ratio is prepared at a nanoelectrode tip using a Cu-mediated oxidation process, which is then modified by pH-sensitive 4-mercaptobenzoic acid (4-MBA) to form 4-MBA@AgNW as a pH sensing probe. With the assistance of a 4D microcontroller, 4-MBA@AgNW is efficient in simultaneously detecting pHi and pHe in both 2D and 3D culture cancer cells by SERS, with minimal invasiveness, high sensitivity, and spatial resolution. Further investigation proves that the surface-roughened single AgNW can also be used in monitoring the dynamic variation of pHi and pHe of cancer cells upon stimulation with anticancer drugs or under a hypoxic environment.
研究领域:
纳米技术
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生物医学工程
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癌症研究
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2017
·Vol. 219
·期 2
·1700427
·
IF 2.5
Pan Yuan,Zheng Ruan,Le Liu,Tuanwei Li,Titao Jing,Lifeng Yan
Supramolecular self-assembly of polymeric molecules for sharp-pH-sensitive (SPS) nanoparticles is an especially important application in biology. Here, amphiphilic polypeptide copolymers are synthesized and spontaneously assembled to micelles in aqueous solution, and protonation of the tertiary amine groups in the side-chain of the copolymer under weak acid causes the micelle disassembly, which is sharp-pH-sensitive, and the responsive pHs can be adjusted by adding salts. Size and morphologic change of the polymeric micelles are characterized by means of dynamic lighting scattering, transmission electron microscope (TEM), and atomic force microscope (AFM) in sequential pH alterations. It is found that the Hofmeister ions play a key factor in controlling the subtle interaction of different noncovalent bonds among polypeptide molecules during their self-assembly or disassembly. The physical property exploration of the SPS micelles may provide a new chance for the development of dynamic, complex nanostructures in various pH-responsive applications.
研究领域:
生物材料学
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高分子化学
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纳米医学
✓ 已验证
DOI
高影响因子
Foodborne Pathogens and Disease
·
2020
·Vol. 17
·期 4
·253-261
·
IF 2.601
Yunge Liu,Lixian Zhu,Pengcheng Dong,Rongrong Liang,Yanwei Mao,Xiaoyin Yang,Yimin Zhang,Xin Luo
This study evaluated the acid tolerance response (ATR) of two strains of Listeria monocytogenes (serotype 1/2a and 4b) and one strain of Listeria innocua under different mildly acid conditions. Cells were incubated in combinations of three concentrations of lactic acid medium (3, 4.75, and 15 mM) and three external pH's (pHex 5.0, 6.0, and 6.5), plus, a HCl control, and a blank control (pH 7.4). Results showed that lactic acid induced lower log reduction of all three strains when challenged in severe acid conditions (pH 3.0) after being habituated at a pHex of 5.5 or 6.0 until the log phase, compared with a pHex of 6.5 or the two controls. This indicates that when the pHex was either 5.5 or 6.0 this induced a higher ATR of the strains, which may be caused by the ability of the strains to retain intracellular pH (pHi) homeostasis with pHi maintained in the range of 7.4–7.9. It was also found that a pHex of 5.5 resulted in the highest pHi of the strains across all incubated conditions, which indicates that the pHi may play an important role in the induction of ATR when Listeria cells are habituated in lactic acid, and if the higher pHi can be maintained, the ATR would be stronger. The concentration of lactic acid per se has no significant effect on ATR, which it is proposed was due to the pHi homeostasis maintained within the cells. However, the difference in ATR among three strains was also significant, which cannot be explained by the stable pHi of all tested strains. Therefore, other underlying mechanisms to mediate ATR under different conditions need to be explored in further studies.
研究领域:
微生物学
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食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER COMPOSITES
·
2016
·
IF 2.004
Qing-Yong Li,Jun Ye,Jian Xiong,Noureddine Abidi
Lanthanide metal complexes as novel luminescent metal-organic frameworks with potential application such as probes, sensors and labels, have greatly been developed. This paper presents novel nanocomposites by reacting terbium salt with the sodium carboxymethyl cellulose (NaCMC) at different pHs, Which were characterized by SEM, TEM, FTIR, XPS, WAXD, GPC, UV-Vis, and PL. The results show that Tb 3+ ions react with O of COO-, -OH, and -COC on NaCMC. The morphologies of these nanocomposites showed spheroidal-like with the size around 100 nm at around neutral pH, but show rod-like and band-like around 100 nm in width and about 500 nm in length at pH = 11 and 12. They emit bright green characteristic fluorescence of Tb 3+ under ultraviolet light due to the antenna effect when NaCMC transfer the energy efficiently to the Tb ions around neutral pHs. However, at higher pH, they show weaker fluorescence intensity in spite of strong crystalline because abundant Na + are involved in them and affected the efficiency of energy transfer between NaCMC and Tb 3+ . These nanocomposites could find potential biological applications base on their fluorescent and biodegradable properties. POLYM. COMPOS., 38:E498–E507, 2017. © 2016 Society of Plastics Engineers
研究领域:
材料科学
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高分子科学
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纳米技术
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发光材料
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配位化学
✓ 已验证
DOI
高影响因子
Food Bioscience
·
2022
·
IF 5.318
Yun Wang,Cheng Yang,Jian Zhang,Lianfu Zhang
Whey protein isolate (WPI) was dietary protein with various functional properties and nutritional value , while anthocyanins were famous for their biological activities. This study aimed to investigate the effect of the interaction between WPI and rose anthocyanin extract (RAEs) at pH7.0 and pH9.0 on the structure, emulsification , and digestibility of WPI. The results showed that compared with the initial WPI, all WPI-RAEs complexes presented lower hydrophobicity and free SH content, higher absolute ζ-potential, thermal stability , and emulsification. In addition, the interaction of WPI and RAEs could reduce the digestibility of WPI. More importantly, WPI-RAEs complexes may be more effective emulsifiers than the original WPI, which was of great value to the dairy processing industry and food nutrition .
研究领域:
食品科学
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营养学
·
蛋白质化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Liying Wu,Junming Hong,Qian Zhang,Bor-Yann Chen,Ji Wang,Zhengyu Dong
This first-attempt study explored interactive function of oxygen vacancies, transition metals, and surface hydroxyl groups for persulfate (PS) activation, at different pH conditions. Oxygen vacancy-rich Fe 2 Co 1 -LDHs was fabricated via calcination in hydrogen atmosphere. The Fe 2 Co 1 -LDH possessed the maximal concentration of oxygen vacancies and abundant hydroxyl groups for effective functioning according to the characterization through X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR). The BPA-degrading efficiency in the LDHs/PS system indicated that Fe 2 Co 1 -LDH exhibited the most promising activated performance since oxygen vacancies could improve the catalytic efficiency to enhance electron transport phenomena between the Fe and Co. N 2 experiments proved that the presence of oxygen vacancies could promote the production of 1 O 2 and O 2 − . Phosphate and pH effect experiments showed the Fe 2 Co 1 -LDH/PS system stably maintained operation performance over a wide pH range for bisphenol A (BPA) removal with the effect of surface hydroxyl groups. Practical samples had little effect on the removal of BPA. According to the quenching experiments and EPR technology, SO 4 − was the main active radicals in acid and neutral conditions and apparently the OH played the crucial role at alkaline pHs. Two different major reaction routes at different pH levels in the Fe 2 Co 1 -LDH/PS system for mechanisms of BPA degradation were proposed herein. The Chemical intermediates of BPA degradation were identified by gas chromatography-mass spectrophotometry (GC–MS) analysis, and degradation pathways were proposed for system optimization.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jiale Yang,Yunhao Gao,Zhiyuan Zhou,Jingyue Tang,Gang Tang,Junfan Niu,Xi Chen,Yuyang Tian,Yan Li,Yongsong Cao
Growing concerns about environmental pollution and future food supplies have encouraged the development of controlled release formulation of pesticides. Porous hollow silica (PHS) is an ideal carrier to prepare pesticide microcapsule due to its hollow structure, high surface area, and biocompatibility. However, the cumbersome preparation process of pesticide microcapsule based on PHS severely restricted its extensive development and application in pesticide products. Herein, an improved soft-template method for preparing pesticide loaded PHS was developed by using newly prepared tributylhexadecylphosphonium dicyanamide [P 44416 ][N(CN) 2 ] as the solvent and soft-template agent. The model pesticide prochloraz (PRO) was entrapped inside PHS in situ without loading process during the preparation process and a core–shell structure sphere (PRO@PIL-PHS-PEC microcapsule) was obtained by coating PRO@PIL-PHS with pectin in solution through electrostatic adsorption. The obtained PRO@PIL-PHS-PEC microcapsules had high drug encapsulation efficiency and good photostability with pectinase and pH responsive release properties. Plate antagonism tests and pot trials indicated that the PRO@PIL-PHS-PEC had a significant long-term control efficacy against S. sclerotiorum and no adverse impact on the growth of rapeseed plant. The prepared PRO@PIL-PHS-PEC could effectively reduce the use of pesticides by significantly improving the effective utilization rate and efficacy of pesticides. The simple and green method for synthesis of PRO@PIL-PHS-PEC based on PIL would have great potential for large-scale application of controlled release formulation in the field of pesticides.
研究领域:
农业科学
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材料科学
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环境科学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-11
·
IF 16.6
Feng Yangyang,Li Yong,Lin Jing,Wu Huyue,Zhu Lei,Zhang Xiang,Zhang Linlin,Sun Chuan-Fu,Wu Maoxiang,Wang Yaobing
Stable lithium metal negative electrodes are desirable to produce high-energy batteries. However, when practical testing conditions are applied, lithium metal is unstable during battery cycling. Here, we propose poly(2-hydroxyethyl acrylate-co-sodium benzenesulfonate) (PHS) as negative electrode protective layer. The PHS contains soft poly (2-hydroxyethyl acrylate) and poly(sodium p-styrene sulfonate), which improve electrode flexibility, connection with the Cu current collector and transport of Li ions. Transmission electron cryomicroscopy measurements reveal that PHS induces the formation of a solid electrolyte interphase with a fluorinated rigid and crystalline internal structure. Furthermore, theoretical calculations suggest that the -SO 3 - group of poly(sodium p-styrene sulfonate) promotes Li-ion motion towards interchain migration through cation-dipole interaction, thus, enabling uniform Li-ion diffusion. Electrochemical measurements of Li | |PHS-coated-Cu coin cells demonstrate an average Coulombic efficiency of 99.46% at 1 mA/cm 2 , 6 mAh/cm 2 and 25 °C. Moreover, when the PHS-coated Li metal negative electrode is paired with a high-areal-capacity LiNi 0.83 Co 0.11 Mn 0.06 O 2 -based positive electrode in multi-layer pouch cell configuration, the battery delivers an initial capacity of 6.86 Ah (corresponding to a specific energy of 489.7 Wh/kg) and, a 91.1% discharge capacity retention after 150 cycles at 2.5 mA/cm 2 , 25 °C and 172 kPa.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Yun-Hao Xia,Ying-Ying Gui,Jia-Hua Zhou,Gui-E Chen,Zhen-Liang Xu
Poly (vinylidene fluoride) (PVDF) membranes are often corroded, leading to structural defects in the treatment of alkaline textile wastewater, greatly reducing separation efficiency. Herein, PVDF membranes were surface-modified through coating and self-assembly methods. Novel adhesives (ad-LNPs) were prepared by heat-releasing endo -crosslinked 2,2-Bis (4-glycidyloxyphenyl) propane (BADE) in lignin (LNP). ad-LNPs coatings provided stable adhesion properties to the PVDF membrane surface and exhibited pH-switchable surface charge with excellent alkali resistance. Subsequently, benzene amine monomers and water-soluble 2-acrylamide-2-methyl-1-propanesulfonic acid (AMPS) are introduced to form a polymer network (AMPS-PANI) layer through self-assembly. The results showed that the membrane permeability and selectivity reached the optimal equilibrium point when the aniline monomers self-polymerization time was 40 min (temperature: 5–10 °C). High dye retention (MB:99.8 %, RhB:99.5 %, CR:98 %, MO:96.2 %) at high purity water flux (172 L·m −2 ·h −1 ). Meanwhile, clever utilization of AMPS swelling behavior imparts the modified membrane with physical self-healing properties, as evidenced by scanning electron microscope (SEM) images showing the filling effect of the repaired membrane. Additionally, the construction of a hydrophilic interface increases the contamination resistance (FRR) of the modified membrane to 97 %. In conclusion, the prepared membrane (M4) not only effectively separates dyes/salts but also exhibits excellent alkali resistance and physical self-healing functionality, demonstrating significant potential for practical treatment of alkaline textile wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Yun Wang,Cheng Yang,Jian Zhang,Lianfu Zhang
Protein-polyphenol interactions can improve the physicochemical properties of proteins. The objective of this study was to investigate the influence of rose anthocyanin extracts (RAEs) on the physicochemical properties and digestibility of whey protein isolate (WPI) sol/gel at different pHs and protein concentrations. Hydrophobicity interaction and ionic bonding were the main forces for the formation of acidic WPI and WPI-RAEs sol/gel. When pH was higher than 2.4, sol/gel became unstable, which may be related to hydrophobicity, ζ-potential value, total sulfhydryl and free sulfhydryl content changes. In addition, RAEs had positive effects on the color and water distribution of all WPI sol/gel. Moreover, RAEs improved the viscoelasticity of WPI sol/gel with protein content ≥ 12 % (w/v) at pH 2.4. More importantly, the addition of RAEs could reduce the digestibility of WPI sol/gel. We hope our works can provide promising strategies for developing WPI-RAEs foods.
研究领域:
食品科学
·
蛋白质化学
·
营养学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）