CARBOHYDRATE POLYMERS
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2021
·
IF 9.381
Xue-dong Wang,Ya Li,Tao-tao Dai,Xue-mei He,Ming-shun Chen,Cheng-mei Liu,Rui-hong Liang,Jun Chen
Novel pectin/poly(m-phenylenediamine) (P/PmPDA) microspheres with different content of PmPDA were prepared by assembling PmPDA on the surface of pectin microsphere. The successful preparation was confirmed by the results of Fourier Transform Infrared spectra (FTIR), scanning electron microscopy (SEM) and elemental analysis. Compared with pectin microsphere, the Pb 2+ adsorption performance of P/PmPDA microspheres was significantly improved. The results of batch adsorption experiments were in good agreement with the Langmuir isotherm model for Pb 2+ adsorption, indicating the adsorption was monolayer. The maximum adsorption capacity of Pb 2+ was found to be 390.9 mg/g. The kinetic adsorption process was well described by the pseudo-second-order model and chemical adsorption dominated the adsorption process. The potential mechanisms of Pb 2+ adsorption were speculated as ion exchange and chelation, which were supported by X-ray photoelectron spectroscopy (XPS). The P/PmPDA microspheres showed good recyclability after five adsorption/desorption cycles. All these results indicated the potential of P/PmPDA microspheres for removing Pb 2+ .
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL RESEARCH
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2020
·
IF 0.593
Zhenzhen Geng,Hong-yu Zhang,Guohui Yin,Yuecheng Zhang,Jiquan Zhao
The ionic liquid 1-methyl-3-(3-sulfopropyl)imidazolium chloride ([MIMPs]+Cl-) in combination with 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) and sodium nitrite (NaNO2) as a catalytic system demonstrates high efficiency in the one-pot two-step aerobic oxidative condensation of benzyl alcohols with 1,2-phenylenediamines to give benzimidazoles. Various benzimidazoles are obtained in good to excellent yields by this strategy.
研究领域:
有机化学
·
催化化学
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DOI
高影响因子
SENSORS
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2017
·Vol. 17
·期 3
·530
·
IF 2.677
Ru-Jia Yu,Jia-Jia Sun,Heng Song,Jing-Zhi Tian,Da-Wei Li,Yi-Tao Long
Real-time monitoring of chemical reactions is still challenging as well as important to study reaction mechanisms and reaction kinetics. Herein, we demonstrated the real-time monitoring of o-phenylenediamine (OPD) oxidation on the surface of gold nanoparticles by surface-enhanced Raman spectroscopy (SERS). The oxidation mechanism and the reaction kinetics were investigated on the basis of the SERS spectrum variation and the related density functionalized theory calculation. It was shown that the oxidation of OPD in the presence of copper ions was a two-step process of the deprotonation of the amino group on the aromatic rings and the rearrangement of the electron cloud to a π-conjugated system, which may open a new door to comprehensively understand the reaction process.Keywords:surface-enhanced Raman spectroscopy;oxidation of o-phenylenediamine;real-time monitoring
研究领域:
化学动力学
·
理论计算
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DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Dan Zhao,Jingjing Huang,Juan Li,Xiao Ma,Fang Wang,Honglei Zhang,Jiaze Xie,Jian Sun,Chuanxia Chen
Dual-readout protocols with two signal transduction channels can significantly improve the detection precision and diversity. In contrast to the previous tedious and time-consuming preparation of two response materials, a convenient and commercially available small molecule o -Phenylenediamine (OPD)-based dual-mode system was developed for the ultrasensitive detection of D-penicillamine (D-PA). Fortunately and interestingly, it is demonstrated that chloride ions (Cl − ) could largely enhance the oxidative ability of copper ions (Cu 2+ ) and improve the reaction rate and efficiency of the Cu 2+ -OPD system, leading to the boosted colorimetric and fluorescent signals and shorter reaction time. Meanwhile, D-PA could strongly bind with Cu 2+ to form a stable Cu 2+ -D-PA complex, thereby inhibiting the aforementioned oxidation process and exhibiting decrease of absorbance values and fluorescence intensity. Inspired by the excellent analytical performance, an “INH” molecular logic gate was devised by employing Cl − and D-PA as the inputs, and the dual-mode strategy has been successfully employed to probe D-PA in tablets and human serum samples. Such cost-effective yet efficacious analytical tool not only improve the sensing performance of the Cu 2+ -OPD reaction system, but also enhance the detection sensitivity for D-PA and promote the application and development of OPD-based reactions.
研究领域:
分析化学
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生物医学工程
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DOI
高影响因子
Journal of the Iranian Chemical Society
·
2025
·
IF 2.3
Tan Yan,Hu Jing,Tang Dongjin,Yu Peng
Thiocyanate (SCN − ) is an anionic contaminant and is a biomarker of environmental cyanide exposure. Therefore, it is particularly necessary to develop a simple, fast and sensitive method for SCN − assay. Herein, a fluorescent assay method was developed to determine SCN − based on Cu 2+ -triggered oxidation of o-phenylenediamine (OPD). Without SCN − , OPD was oxidized by Cu 2+ and the resultant product (i.e., OPD oxide) exhibited a high fluorescence. However, in the presence of SCN − , Cu 2+ reacted with SCN − ; and thus, the oxidation ability of Cu 2+ toward OPD was reduced, resulting in a weak fluorescence. Several important parameters such as the concentrations of Cu 2+ and OPD, pH and the reaction time were optimized. Under the optimized conditions, the linear range was 5–80 μM and the limit of detection was 5 μM for SCN − assay. In addition, the high selectivity and the satisfactory recoveries in tap water and artificial saliva were achieved for SCN − detection due to the strong chelation between SCN − and Cu 2+ . The whole detection process was simple and fast without using complex nanoparticles. More importantly, the developed assay method will have promising applications in monitoring of SCN − for the assessment of water safety and human health. Graphical abstract
研究领域:
分析化学
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环境科学
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生物医学
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DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2020
·Vol. 412
·期 3
·611-620
·
IF 3.637
Wang Chengnan,Gao Xia,Wang Shuo,Liu Yaqing
Infections caused by foodborne microorganisms are a great threat to the global environment and public healthcare today. Thus, rapid, portable and sensitive assays that can realize the identification of foodborne bacteria are highly desired. In this study, a smart fluorescent and colorimetric dual-readout sensing system has been established for simple and rapid E. coli determination by utilizing the Cu 2+ -triggered oxidation of o -phenylenediamine (OPD). Initially, Cu 2+ can oxidize OPD to OPDox, resulting in an orange-yellow fluorescence and visible pale-yellow color. However, E. coli can effectively reduce Cu 2+ into Cu + , inhibiting the Cu 2+ -triggered oxidation of OPD to OPDox. Consequently, the introduction of E. coli can turn off both the fluorescence and the UV-vis absorbance signals of the OPD-Cu 2+ system, illustrating an original mechanism for fluorescent and colorimetric dual-channel detection of E. coli . Moreover, a filter paper-based visual sensor was built and coupled with OPD-Cu 2+ solution under the assistance of a UV lamp. The as-prepared sensor can detect E. coli quantitatively with the help of a typical smartphone color-scanning application (APP). Thus, this study offers a valid dual-mode assay for sensitive and on-site visible detection of E. coli , guaranteeing the reliability of the results and is more attractive for practical use.
Schematic illustration of the smartphone-integrated sensing system for fluorescent and colorimetric dual-channel detection of E. coli based on the Cu 2+ -OPD system.
研究领域:
食品安全
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微生物学
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分析化学
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DOI
PubMed
高影响因子
TALANTA
·
2016
·
IF 4.035
Chao Zhao,Zhongwei Jiang,Ruizhu Mu,Yuanfang Li
In this work, a novel sensor based on fluorescence enhancement of Fe-MIL-88- H 2 O 2 -o-phenylenediamine (OPD) system for the determination of dopamine (DA) was developed. Fe-MIL-88 with intrinsic peroxidase-like catalytic activity tended to oxidize the nonfluorescent OPD into the fluorescent 2,3-diaminophenazine (DAP) with the presence of H 2 O 2 . When DA was introduced, the autoxidation of DA to yield hydroxyl radical (·OH) was further enhanced by Fe 3+ site in Fe 3 -μ 3 -oxo clusters exiting in Fe-MIL-88 MOFs , meanwhile the generated Fe 2+ appeared to involve a Fenton type reaction in the presence of H 2 O 2 to cause a continuous production of ·OH radicals which greatly enhanced the conversion efficiency of the OPD to fluorescent DAP. Thus, the turn-on fluorescence method for the DA detection was established. The linear range was from 50 nm to 30 μM with detection limit 46 nm (3σ/s). Furthermore, the proposed method has been reliably applied to determine dopamine content in dopamine hydrochloride injection and human urine with satisfactory results, which suggests its great potential for assay DA in chemical and biological analytical applications.
研究领域:
分析化学
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生物医学工程
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DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
·
IF 4.831
Peihua Li,Na Liang,Chao Liu,Lian Xia,Fengli Qu,Zhi-Ling Song,Rong-Mei Kong
In this work, a novel silver ion (Ag + )-regulated ratiometric fluorescence method for the effective and sensitive determination of alkaline phosphatase (ALP) was established based on carbon dots (CDs) and o -phenylenediamine (OPD). OPD can be oxidized by Ag + to generate fluorescent 2, 3-diaminophenazine (DAP). Thus, based on inner-filter effect (IFE) or/and fluorescence resonance energy transfer (FRET) between CDs and DAP, the CDs-Ag + -OPD system can generate dual-emission at 454 nm and 570 nm respectively when excited at 360 nm. The introduction of ascorbic acid (AA) can react with Ag + to produce dehydroascorbic acid (DHAA), which inhibits the generation of DAP, resulting in the fluorescence decrease at 570 nm and fluorescence recovery of CDs at 454 nm. Meanwhile, DHAA can react with OPD to generate quoxaline (QX), which emits strong blue fluorescence at 440 nm, further inhibiting the IFE or/and FRET between CDs and DAP. An obvious ratiometric fluorescence response was observed with the increase of the concentration of AA introduced. Due to the fact that AA can be generated by the enzyme catalysis reaction between ALP and 2-phospho- l -ascorbic acid (AAP), the CDs-Ag + -OPD ratiometric system was applied to the determination of ALP successfully. The ratiometric fluorescence value of F 454 / F 570 increases with increasing ALP concentration, with a linear range of 0.2 to 40 U/L and detection limit of 0.1 U/L. In addition, the CDs-Ag + -OPD ratiometric system was successfully applied to the detection of ALP in human serum samples.
研究领域:
分析化学
·
生物医学
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产品关联
DOI
PubMed
高影响因子
JOM
·
2019
·Vol. 72
·期 12
·4288-4295
·
IF 2.305
Zhang Jia-Wei,Li Ying,Ding Yu-Shi,Pan Ke-Feng,Zhao Qing
Poly( o -phenylenediamine) was synthesized in different inorganic acid media, hydrochloric (HCl), nitric (HNO 3 ), and phosphoric acid (H 3 PO 4 ).
The aim was to investigate the protective effect of doped coatings on mild steel in an aggressive environment. The synthesized doped-PoPD products were characterized by x-ray diffractometry, Fourier transform infrared spectroscopy, scanning electron microscopy, and cyclic voltammetry. The inhibition abilities of doped coatings were evaluated by potentiodynamic polarization measurements and electrochemical impedance spectroscopy in 3.5% NaCl solution. In the present article, the lowest corrosion current and highest protection efficiency of the doped polymer were observed for the polymer synthesized in HNO 3 medium. The results showed that good protection of mild steel can be achieved by PoPD coating doped with inorganic acid in 3.5% NaCl solution.
研究领域:
材料科学
·
腐蚀与防护
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DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 12
·3675
·
IF 4.927
Yunxiao Feng,Gang Liu,Chunhuan Zhang,Jinrui Li,Yuanyuan Li,Lin Liu
This work suggested that Cu2+ion coordinated by the peptide with a histidine (His or H) residue in the first position from the free N-terminal reveals oxidase-mimicking activity. A biotinylated polymer was prepared by modifying His residues on the side chain amino groups of lysine residues (denoted as KH) to chelate multiple Cu2+ions. The resulting biotin-poly-(KH-Cu)20polymer with multiple catalytic sites was employed as the signal label for immunoassay. Prostate specific antigen (PSA) was determined as the model target. The captured biotin-poly-(KH-Cu)20polymer could catalyze the oxidation ofo-phenylenediamine (OPD) to produce fluorescent 2,3-diaminophenazine (OPDox). The signal was proportional to PSA concentration from 0.01 to 2 ng/mL, and the detection limit was found to be eight pg/mL. The high sensitivity of the method enabled the assays of PSA in real serum samples. The work should be valuable for the design of novel biosensors for clinical diagnosis.Keywords:fluorescent immunoassay;peptide;copper;O-phenylenediamine;prostate specific antigen
研究领域:
生物化学
·
分析化学
·
临床诊断
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DOI
PubMed
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Xuyin Lin,Jinwen Jiang,Jun Wang,Jiaofen Lin,Aikebaier Reheman
ABSTRACT In this study, we used mesoporous silica materials as inorganic carrier and poly(o-phenylenediamine) with more active amino and imino groups as organic ligand to obtain functionalized adsorbent. The composite adsorbent poly(o-phenylenediamine) modified mesoporous composites (MPP) were prepared by loading poly(o-phenylenediamine) onto the surface of the aminated mesoporous material through in-situ polymerization. It was found that the maximum saturation adsorption capacity of MPP reached 225 mg/g when the solution pH, temperature, initial Hg(II) concentration, and adsorption time were 4, 298.15 K, 100 mg/L, and 240 min, respectively. When common interfering ions Zn(II), Ni(II), Cu(II), Ca(II), Mg(II) and Al(III) were present, the adsorption of Hg(II) by MPP still showed good selectivity. The adsorption of Hg(II) by MPP followed quasi-secondary kinetics and the Langmuir adsorption isotherm model, indicating that the adsorption process was chemisorption. In addition, MPP removed up to 81.35% of Hg(II) from industrial wastewater. After five cycles for adsorbent regeneration experiments, the adsorption capacity of MPP could reach 191.67 mg/g, indicating that the adsorbent has good regeneration performance and potential application value for removal of Hg(II).
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Xipeng Dong,Wanqing Li,Xue Chen,Er Zhuo,Zizhuo Zhai,Hongxia Qi,Yu Kang,Pudun Zhang
O -phenylenediamine (OPD) is commonly used as a precursor in the preparation of red emissive carbon quantum dots (R-CQDs) due to the sp 2 hybridized structure. However, the low fluorescence quantum yield (QY) of the OPD-based R-CQDs limits its application. Although some efforts have been made, the improvement of QY is still limited. In this paper, a strategy is proposed to improve the QY of OPD-based R-CQDs by introducing ethylenediamine (EDA), which plays a key role as a nitrogen (N) dopant due to its high N content. The molar ratio of OPD to EDA (M OPD /M EDA ), the reaction time (t) and temperature (T), and the amount of concentrated H 2 SO 4 (V H2SO4 ), are optimized. The R-CQDs with QY as high as 32.65% and full width at half maximum (FWHM) emission as narrow as 25 nm are obtained via a hydrothermal procedure under the optimal experimental conditions (i.e., M OPD /M EDA = 1/3, t = 6 h, T = 180 °C and V H2SO4 = 4 mL). Such a QY is higher than most of the reported OPD-based R-CQDs. Besides, it is found that concentrated H 2 SO 4 acts as the catalyst in addition to protonation. The enhancement of QY is attributed to the increase of the aromatic N-containing heterocyclic structures (C═N) after the introduction of EDA and catalysis by H 2 SO 4 .
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）