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  1. No Access

    Article

    Single-atom Pd catalysts as oxidase mimics with maximum atom utilization for colorimetric analysis

    Pd-based nanomaterials have shown great promise as potential mimic enzymes, but conventional catalysts use only a small fraction of the Pd content that located on the catalyst’s surface. Herein, we demonstrate...

    Zhe Li, Fangning Liu, Yuanyuan Jiang, Pengjuan Ni, Chenghui Zhang, Bo Wang… in Nano Research (2022)

  2. No Access

    Article

    Colorimetric detection of acetylcholinesterase and its inhibitor based on thiol-regulated oxidase-like activity of 2D palladium square nanoplates on reduced graphene oxide

    A convenient and sensitive colorimetric assay for acetylcholinesterase (AChE) and its inhibitor has been designed based on the oxidase-like activity of {100}-faceted Pd square nanoplates which are grown in sit...

    Bingsong Yan, Wendong Liu, Guangbin Duan, Pengjuan Ni, Yuanyuan Jiang… in Microchimica Acta (2021)

  3. No Access

    Article

    Ultrathin PdCu alloy nanosheet–assembled 3D nanoflowers with high peroxidase-like activity toward colorimetric glucose detection

    Enzyme-mimetic properties of nanomaterials can be efficiently tuned by controlling their size, composition, and structure. Here, ultrathin PdCu alloy nanosheet–assembled three-dimensional (3D) nanoflowers (Pd1Cux

    Wendong Liu, Junnan Guo, Chuanxia Chen, Pengjuan Ni, Yuanyuan Jiang… in Microchimica Acta (2021)

  4. No Access

    Article

    Colorimetric determination of the activity of alkaline phosphatase by exploiting the oxidase-like activity of palladium cube@CeO2 core-shell nanoparticles

    Core-shell palladium cube@CeO2 (Pd cube@CeO2) nanoparticles are shown to display oxidase-like activity. This is exploited in a method for determination of the activity of alkaline phosphatase (ALP). The Pd cube@C...

    Jiawei Wang, Pengjuan Ni, Chuanxia Chen, Yuanyuan Jiang… in Microchimica Acta (2020)

  5. No Access

    Article

    Fluorometric and colorimetric dual-readout alkaline phosphatase activity assay based on enzymatically induced formation of colored Au@Ag nanoparticles and an inner filter effect

    An ultrasensitive fluorometric and colorimetric dual-mode assay is described for the determination of the activity of alkaline phosphatase (ALP). ALP catalyzes the decomposition of 2-phospho-L-ascorbic acid, a...

    Chuanxia Chen, Guanglu Zhang, Pengjuan Ni, Yuanyuan Jiang, Yizhong Lu… in Microchimica Acta (2019)

  6. No Access

    Article

    Spectrophotometric determination of the activity of alkaline phosphatase and detection of its inhibitors by exploiting the pyrophosphate-accelerated oxidase-like activity of nanoceria

    The oxidase-like activity of nanoceria is low. This limits its practical applications. It is demonstrated here that pyrophosphate ion (PPi) can improve the oxidase-like activity of nanoceria. Specifically, nan...

    Pengjuan Ni, Junfeng **e, Chuanxia Chen, Yuanyuan Jiang, Zhenlu Zhao… in Microchimica Acta (2019)

  7. No Access

    Article

    Fluorometric determination of the activity of alkaline phosphatase and its inhibitors based on ascorbic acid-induced aggregation of carbon dots

    The authors describe a fluorometric method for determination of the activity of alkaline phosphatase (ALP) and its inhibitors. Nitrogen and boron co-doped carbon dots (C-dots) with excitation/emission peaks at...

    Pengjuan Ni, Junfeng **e, Chuanxia Chen, Yuanyuan Jiang, Yizhong Lu… in Microchimica Acta (2019)

  8. No Access

    Article

    Fluorometric determination of sulfide ions via its inhibitory effect on the oxidation of thiamine by Cu(II) ions

    A fluorometric assay is described for sulfide ions determination. It is based on the finding that the oxidation of the non-fluorescent substrate thiamine (TH) by Cu(II) in basic solution to form fluorescent th...

    Pengjuan Ni, Chuanxia Chen, Yuanyuan Jiang, Zhenlu Zhao, Yizhong Lu in Microchimica Acta (2018)

  9. No Access

    Article

    Colorimetric determination of the activity of acetylcholinesterase and its inhibitors by exploiting the iodide-catalyzed oxidation of 3,3′,5,5′-tetramethylbenzidine by hydrogen peroxide

    We describe a sensitive and selective colorimetric method for the determination of the activity of the enzyme acetylcholinesterase (AChE) and its inhibitors. Detection is based on the fact that acetylthiocholi...

    Pengjuan Ni, Yu**g Sun, Haichao Dai, Shu Jiang, Wangdong Lu… in Microchimica Acta (2016)

  10. No Access

    Article

    Increased response to oxidative stress challenge of nano-copper-induced apoptosis in mesangial cells

    Recently, many studies reported that nanosized copper particles (nano-Cu, the particle size was around 15–30 nm), one of the nanometer materials, could induce nephrotoxicity. To detect the effect of nano-Cu on...

    Pengjuan Xu, Zhigui Li, **aochen Zhang, Zhuo Yang in Journal of Nanoparticle Research (2014)

  11. No Access

    Article

    In vitro toxicity of nanosized copper particles in PC12 cells induced by oxidative stress

    Recent evidence suggests that some nanomaterials, which are widely used in many fields, have health effects. In order to investigate the cytotoxicity induced by nanosized copper particles (nano-Cu), PC12 cells...

    Pengjuan Xu, **g Xu, Shichang Liu, Guogang Ren… in Journal of Nanoparticle Research (2012)