Polydopamine dots as an ultrasensitive fluorescent probe switch for Cr(VI) <i>in vitro</i>

Zhao, Shizhen; Song, Xun; Bu, Xiuming; Zhu, Chong; Wang, Gang; Liao, Fang; Yang, Siwei

doi:10.1002/app.44784

Cited by 23 publications

(8 citation statements)

References 54 publications

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“…Besides overall retention ability, we also focused on the impact of the PA´s morphology parameters (fiber diameter and surface density) and functionalization on their retention. Generally, fiber diameter is considered to be a crucial factor influencing the filtration efficiency of materials [ 44 , 53 , 54 ] and also plays a role in microbial interactions, mainly cell adhesion and biofilm formation [ 37 , 55 ]. Although the analyzed PAs were made up of three different percentages of PA solutions and thus differed in their fiber diameter ( Table 1 ), there was no significant difference between their retention ( p ≥ 0.05).…”

Section: Resultsmentioning

confidence: 99%

Benefits of Polyamide Nanofibrous Materials: Antibacterial Activity and Retention Ability for Staphylococcus Aureus

et al. 2021

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Although nanomaterials are used in many fields, little is known about the fundamental interactions between nanomaterials and microorganisms. To test antimicrobial properties and retention ability, 13 electrospun polyamide (PA) nanomaterials with different morphology and functionalization with various concentrations of AgNO3 and chlorhexidine (CHX) were analyzed. Staphylococcus aureus CCM 4516 was used to verify the designed nanomaterials’ inhibition and permeability assays. All functionalized PAs suppressed bacterial growth, and the most effective antimicrobial nanomaterial was evaluated to be PA 12% with 4.0 wt% CHX (inhibition zones: 2.9 ± 0.2 mm; log10 suppression: 8.9 ± 0.0; inhibitory rate: 100.0%). Furthermore, the long-term stability of all functionalized PAs was tested. These nanomaterials can be stored at least nine months after their preparation without losing their antibacterial effect. A filtration apparatus was constructed for testing the retention of PAs. All of the PAs effectively retained the filtered bacteria with log10 removal of 3.3–6.8 and a retention rate of 96.7–100.0%. Surface density significantly influenced the retention efficiency of PAs (p ≤ 0.01), while the effect of fiber diameter was not confirmed (p ≥ 0.05). Due to their stability, retention, and antimicrobial properties, they can serve as a model for medical or filtration applications.

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Section: Resultsmentioning

confidence: 99%

Benefits of Polyamide Nanofibrous Materials: Antibacterial Activity and Retention Ability for Staphylococcus Aureus

et al. 2021

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“…The 1 H NMR spectrum of indole ( Figure S6 A) exhibits only signals between 6.56 and 8.15 ppm that correspond to a conjugated system, whereas the spectra of the CPDs show more peaks, especially at lower chemical shifts (0.87–5.34 ppm), that are attributed to sp 3 -hybridized carbons, amines, or H−C−O/N units ( Zhu et al., 2013 ; Li et al., 2017 ). The peaks in the 6.46–8.08 ppm range in the CPD spectra originated from protons in the N-doped carbon cores ( Zhao et al., 2017 ), whereas the peak at 8.08 ppm is ascribable to a pyrrole-ring proton because it is similar to the analogous peak in the spectrum of indole. Furthermore, the peaks at 8.79 and 9.05 ppm, which are assigned to H−C=O units, are consistent with oxidation of the heterocyclic surface of the CPD ( Wang et al., 2011 ).…”

Section: Resultsmentioning

confidence: 99%

Indole Carbonized Polymer Dots Boost Full-Color Emission by Regulating Surface State

et al. 2020

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Summary Carbonized polymer dots (CPDs) are impressive imaging probes with great potential for enriching the library of metal-free fluorescent materials, yet current strategies have struggled to achieve products that emit full-color light in a single reaction system. Establishing an efficient and robust synthesis approach that unlocks the color barrier to the luminescence centers of specific CPDs remains a challenge. Herein, the surface-state engineering of pyridine and amide in the indole system to create a palette of resolvable full-color light-emissive CPDs is reported. Detailed structural analysis revealed that cationic polymerization and oxidation reactions potentially contribute to the formation of the main frameworks and emission centers of the final CPDs, with emissive oxygen- and nitrogen-based centers fixed by cross-linked polymer structures. This study provides valuable insight into the energy absorbance and photoluminescence mechanism of CPDs and introduces additional reactants (benzo heterocycle) into CPD research.

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“…Biomass-derived materials are suitable for the developments of CDs due to their high carbon content. [18,19] Using the flavonoid luteolin, 3 0 ,4 0 ,5,7-tetrahydroxyflavone, as raw material for CD synthesis, these biomassderived CDs consist of sp 2 -or sp 3 -hybridized carbon structures. Through the additional doping with nitrogen such as pyridinic N, the N-CD matrix effect could be markedly modified.…”

Section: Introductionmentioning

confidence: 99%

N‐doped luteolin‐based carbon dots as a novel matrix for the analysis of small molecules byMALDI‐TOF MS

Zhao

Piao

Meng

et al. 2021

J Chinese Chemical Soc

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Biomass-derived carbon dots were synthesized by a hydrothermal method using the flavonoid luteolin, 3 0 ,4 0 ,5,7-tetrahydroxyflavone, as a carbon source. The reaction conditions were optimized with regard to reaction temperature, reaction time, and amount of luteolin. N-doped luteolin-based carbon dots (N-CDs) were obtained through the addition of ethylenediamine and used as MALDI-TOF matrix for the analysis of amino acids and other low molecularweight molecules. Compared with N-free CDs, the matrix application of N-CDs displayed less background interferences, high sensitivity, superior efficiency, and good repeatability. Pyridinic N atoms were identified as the major component of the nitrogen dopants in N-CDs. The lone electron pair of this N species, which is located in an sp 2 -orbital perpendicular to the aromatic system, and the π-conjugated structure contributed to an enhanced desorption/ ionization efficiency. Furthermore, the qualitative detection of amino acids in serum samples was accomplished by MALDI-TOF MS using the N-CD matrix. This new type of MALDI-TOF matrix demonstrated its potential in the analysis of small molecules present in chemical, environmental, or biological samples.

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Polydopamine dots as an ultrasensitive fluorescent probe switch for Cr(VI) in vitro

Cited by 23 publications

References 54 publications

Benefits of Polyamide Nanofibrous Materials: Antibacterial Activity and Retention Ability for Staphylococcus Aureus

Benefits of Polyamide Nanofibrous Materials: Antibacterial Activity and Retention Ability for Staphylococcus Aureus

Indole Carbonized Polymer Dots Boost Full-Color Emission by Regulating Surface State

N‐doped luteolin‐based carbon dots as a novel matrix for the analysis of small molecules byMALDI‐TOF MS

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