1
|
Srivastava T, Chaudhuri S, Rich CC, Schatz GC, Frontiera RR, Bruggeman P. Probing time-resolved plasma-driven solution electrochemistry in a falling liquid film plasma reactor: Identification of HO2- as a plasma-derived reducing agent. J Chem Phys 2024; 160:094201. [PMID: 38436446 DOI: 10.1063/5.0190348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Accepted: 02/13/2024] [Indexed: 03/05/2024] Open
Abstract
Many applications involving plasma-liquid interactions depend on the reactive processes occurring at the plasma-liquid interface. We report on a falling liquid film plasma reactor allowing for in situ optical absorption measurements of the time-dependence of the ferricyanide/ferrocyanide redox reactivity, complemented with ex situ measurement of the decomposition of formate. We found excellent agreement between the measured decomposition percentages and the diffusion-limited decomposition of formate by interfacial plasma-enabled reactions, except at high pH in thin liquid films, indicating the involvement of previously unexplored plasma-induced liquid phase chemistry enabled by long-lived reactive species. We also determined that high pH facilitates a reduction-favoring environment in ferricyanide/ferrocyanide redox solutions. In situ conversion measurements of a 1:1 ferricyanide/ferrocyanide redox mixture exceed the measured ex situ conversion and show that conversion of a 1:1 ferricyanide/ferrocyanide mixture is strongly dependent on film thickness. We identified three dominant processes: reduction faster than ms time scales for film thicknesses >100 µm, •OH-driven oxidation on time scales of <10 ms, and reduction on 15 ms time scales for film thickness <100 µm. We attribute the slow reduction and larger formate decomposition at high pH to HO2- formed from plasma-produced H2O2 enabled by the high pH at the plasma-liquid interface as confirmed experimentally and by computed reaction rates of HO2- with ferricyanide. Overall, this work demonstrates the utility of liquid film reactors in enabling the discovery of new plasma-interfacial chemistry and the utility of atmospheric plasmas for electrodeless electrochemistry.
Collapse
Affiliation(s)
- Tanubhav Srivastava
- Department of Mechanical Engineering, University of Minnesota, 111 Church St. SE, Minneapolis, Minnesota 55455, USA
| | - Subhajyoti Chaudhuri
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA
| | - Christopher C Rich
- Department of Chemistry, University of Minnesota, 207 Pleasant St. SE, Minneapolis, Minnesota 55455, USA
| | - George C Schatz
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA
| | - Renee R Frontiera
- Department of Chemistry, University of Minnesota, 207 Pleasant St. SE, Minneapolis, Minnesota 55455, USA
| | - Peter Bruggeman
- Department of Mechanical Engineering, University of Minnesota, 111 Church St. SE, Minneapolis, Minnesota 55455, USA
| |
Collapse
|
2
|
Xie Q, Yang J, Cai J, Shen F, Gu J. Homogeneous preparation of water-soluble products from chitin under alkaline conditions and their cell proliferation in vitro. Int J Biol Macromol 2023; 231:123321. [PMID: 36657539 DOI: 10.1016/j.ijbiomac.2023.123321] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 12/18/2022] [Accepted: 01/14/2023] [Indexed: 01/18/2023]
Abstract
The purpose of this study was to prepare water-soluble products by homogeneous depolymerization of chitin with H2O2 under alkaline conditions and investigate their potential application in wound healing. For the first time, water-soluble products were successfully prepared using a chitin-NaOH/urea solution; the products were chitosans with molecular weights (Mw) of 3.48-33.5 kDa and degrees of deacetylation (DD) > 0.5. Their Mw, DD and yield were affected by the reaction temperature, reaction time, concentration of H2O2 and chitin DD. The deacetylation and depolymerization of chitin were achieved simultaneously. The depolymerization of chitin was caused by hydrogen abstraction of HO, whereas the deacetylation resulted from the cleavage of amide bonds by HO- and HO2-, although the latter played a more important role. All water-soluble chitosans markedly promoted the proliferation of human skin fibroblast (HSF) cells, but they inhibited the proliferation of human keratinocyte cells. For the proliferation of HSF, a low concentration of chitosans was important. In addition, water-soluble chitosans with an Mw of 3.48-16.4 kDa markedly stimulated the expression of growth factors such as PDGF and TGF-β by macrophages. Water-soluble chitosans could be used as a potential active component in wound dressings.
Collapse
Affiliation(s)
- Qinyue Xie
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China
| | - Jianhong Yang
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China.
| | - Jun Cai
- Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei Key Laboratory of Industrial Microbiology, Hubei University of Technology, Wuhan 430068, China
| | - Fengqin Shen
- Changzhou Liu Guojun Vocational Technology College, Changzhou 213025, Jiangsu, China
| | - Jianbin Gu
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China
| |
Collapse
|
3
|
Oxidation of hexacyanoferrate(II) ion by hydrogen peroxide: evidence of free radical intermediacy. REACTION KINETICS MECHANISMS AND CATALYSIS 2021. [DOI: 10.1007/s11144-021-02026-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
4
|
Lai B, Bernhardt PV, Krömer JO. Cytochrome c Reductase is a Key Enzyme Involved in the Extracellular Electron Transfer Pathway towards Transition Metal Complexes in Pseudomonas Putida. CHEMSUSCHEM 2020; 13:5308-5317. [PMID: 32678505 PMCID: PMC7589348 DOI: 10.1002/cssc.202001645] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 07/16/2020] [Indexed: 05/06/2023]
Abstract
Mediator-based extracellular electron transfer (EET) pathways can balance the redox metabolism of microbes. However, such electro-biosynthesis processes are constrained by the unknown underlying EET mechanisms. In this paper, Pseudomonas putida was studied to systematically investigate its EET pathway to transition metal complexes (i. e., [Fe(CN)6 ]3-/4- and [Co(bpy)3 ]3+/2+ ; bpy=2,2'-bipyridyl) under anaerobic conditions. Comparative proteomics showed the aerobic respiratory components were upregulated in a bioelectrochemical system without oxygen, suggesting their potential contribution to EET. Further tests found inhibiting cytochrome c oxidase activity by NaN3 and NADH dehydrogenase by rotenone did not significantly change the current output. However, the EET pathway was completely blocked, while cytochrome c reductase activity was inhibited by antimycin A. Although it cannot be excluded that cytochrome c and the periplasmic subunit of cytochrome c oxidase donate electrons to the transition metal complexes, these results strongly demonstrate that cytochrome c reductase is a key complex for the EET pathway.
Collapse
Affiliation(s)
- Bin Lai
- Systems Biotechnology group, Department of Solar MaterialsHelmholtz Centre for Environmental Research - UFZLeipzig04318Germany
- Advanced Water Management CentreThe University of QueenslandBrisbane4072Australia
| | - Paul V. Bernhardt
- School of Chemical and Molecular BiosciencesThe University of QueenslandBrisbane4072Australia
| | - Jens O. Krömer
- Systems Biotechnology group, Department of Solar MaterialsHelmholtz Centre for Environmental Research - UFZLeipzig04318Germany
| |
Collapse
|
5
|
Gao Q, Shi N, Sun Q, Sanson A, Milazzo R, Carnera A, Zhu H, Lapidus SH, Ren Y, Huang Q, Chen J, Xing X. Low-Frequency Phonon Driven Negative Thermal Expansion in Cubic GaFe(CN) 6 Prussian Blue Analogues. Inorg Chem 2018; 57:10918-10924. [PMID: 30106577 DOI: 10.1021/acs.inorgchem.8b01526] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The understanding of the negative thermal expansion (NTE) mechanism is vital not only for the development of new NTE compounds but also for effectively controlling thermal expansion. Here, we report an interesting isotropic NTE property in cubic GaFe(CN)6 Prussian blue analogues (α l = -3.95 × 10-6 K-1, 100-475 K), which is a new example to understand the complex NTE mechanism. A combined study of synchrotron X-ray diffraction, X-ray total scattering, X-ray absorption fine structure, neutron powder diffraction, and density functional theory calculations shows that the NTE of GaFe(CN)6 originates from the low-frequency phonons (< ∼100 cm-1), which are directly related to the transverse vibrations of the atomic -Ga-N≡C-Fe- chains. Both the Ga-N and Fe-C chemical bonds are much softer to bend than to stretch. The direct evidence that transverse vibrational contribution to the NTE of GaFe(CN)6 is dominated by N, instead of C atoms, is illustrated. It is interesting to find that the polyhedra of GaFe(CN)6 are not rigid, which is a starting assumption in some models describing the NTE properties of other systems. The NTE mechanism can be vividly described by the "guitar-string" effect, which would be the common feature for the NTE property of many open-framework functional materials, such as Prussian blue analogues, oxides, cyanides, metal-organic frameworks, and zeolites.
Collapse
Affiliation(s)
- Qilong Gao
- Beijing Advanced Innovation Center for Materials Genome Engineering , University of Science and Technology Beijing , Beijing 100083 , China.,Department of Physical Chemistry , University of Science and Technology Beijing , Beijing 100083 , China
| | - Naike Shi
- Beijing Advanced Innovation Center for Materials Genome Engineering , University of Science and Technology Beijing , Beijing 100083 , China.,Department of Physical Chemistry , University of Science and Technology Beijing , Beijing 100083 , China
| | - Qiang Sun
- International Laboratory for Quantum Functional Materials of Henan, School of Physics and Engineering , Zhengzhou University , Zhengzhou 450001 , China
| | - Andrea Sanson
- Department of Physics and Astronomy , University of Padova , Padova I-35131 , Italy
| | - Ruggero Milazzo
- Department of Physics and Astronomy , University of Padova , Padova I-35131 , Italy
| | - Alberto Carnera
- Department of Physics and Astronomy , University of Padova , Padova I-35131 , Italy
| | - He Zhu
- Beijing Advanced Innovation Center for Materials Genome Engineering , University of Science and Technology Beijing , Beijing 100083 , China.,Department of Physical Chemistry , University of Science and Technology Beijing , Beijing 100083 , China
| | - Saul H Lapidus
- Argonne National Laboratory , X-ray Science Division , Argonne , Illinois 60439 , United States
| | - Yang Ren
- Argonne National Laboratory , X-ray Science Division , Argonne , Illinois 60439 , United States
| | - Qingzhen Huang
- NIST Center for Neutron Research , National Institute of Standards and Technology , Gaithersburg , Maryland 20899-6102 , United States
| | - Jun Chen
- Beijing Advanced Innovation Center for Materials Genome Engineering , University of Science and Technology Beijing , Beijing 100083 , China.,Department of Physical Chemistry , University of Science and Technology Beijing , Beijing 100083 , China
| | - Xianran Xing
- Beijing Advanced Innovation Center for Materials Genome Engineering , University of Science and Technology Beijing , Beijing 100083 , China.,Department of Physical Chemistry , University of Science and Technology Beijing , Beijing 100083 , China
| |
Collapse
|
6
|
|
7
|
Kudryasheva NS, Kovel ES, Sachkova AS, Vorobeva AA, Isakova VG, Churilov GN. Bioluminescent Enzymatic Assay as a Tool for Studying Antioxidant Activity and Toxicity of Bioactive Compounds. Photochem Photobiol 2016; 93:536-540. [PMID: 27645453 DOI: 10.1111/php.12639] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2016] [Accepted: 08/05/2016] [Indexed: 01/17/2023]
Abstract
A bioluminescent assay based on a system of coupled enzymatic reactions catalyzed by bacterial luciferase and NADH:FMN-oxidoreductase was developed to monitor toxicity and antioxidant activity of bioactive compounds. The assay enables studying toxic effects at the level of biomolecules and physicochemical processes, as well as determining the toxicity of general and oxidative types. Toxic and detoxifying effects of bioactive compounds were studied. Fullerenols, perspective pharmaceutical agents, nanosized particles, water-soluble polyhydroxylated fullerene-60 derivatives were chosen as bioactive compounds. Two homologous fullerenols with different number and type of substituents, C60 O2-4 (OH)20-24 and Fe0.5 C60 (OH) x Oy (x + y = 40-42), were used. They suppressed bioluminescent intensity at concentrations >0.01 g L-1 and >0.001 g L-1 for C60 O2-4 (OH)20-24 and Fe0.5 C60 (OH)x Oy , respectively; hence, a lower toxicity of C60 O2-4 (OH)20-24 was demonstrated. Antioxidant activity of fullerenols was studied in model solutions of organic and inorganic oxidizers; changes in toxicities of general and oxidative type were determined; detoxification coefficients were calculated. Fullerenol C60 O2-4 (OH)20-24 revealed higher antioxidant ability at concentrations 10-17 -10-5 g L-1 . The difference in the toxicity and antioxidant activity of fullerenols was explained through their electron donor/acceptor properties and different catalytic activity. Principles of bioluminescent enzyme assay application for evaluating the toxic effect and antioxidant activity of bioactive compounds were summarized and the procedure steps were described.
Collapse
Affiliation(s)
- Nadezhda S Kudryasheva
- Institute of Biophysics SB RAS, Krasnoyarsk, Russia.,Siberian Federal University, Krasnoyarsk, Russia
| | - Ekaterina S Kovel
- Institute of Biophysics SB RAS, Krasnoyarsk, Russia.,Siberian Federal University, Krasnoyarsk, Russia
| | - Anna S Sachkova
- National Research Tomsk Polytechnic University, Tomsk, Russia
| | - Anna A Vorobeva
- National Research Tomsk Polytechnic University, Tomsk, Russia
| | | | | |
Collapse
|
8
|
Tarasova AS, Stom DI, Kudryasheva NS. Antioxidant activity of humic substances via bioluminescent monitoring in vitro. ENVIRONMENTAL MONITORING AND ASSESSMENT 2015; 187:89. [PMID: 25663400 DOI: 10.1007/s10661-015-4304-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2014] [Accepted: 01/13/2015] [Indexed: 06/04/2023]
Abstract
UNLABELLED This work considers antioxidant properties of natural detoxifying agents-humic substances (HS) in solutions of model inorganic and organic compounds of oxidative nature-complex salt K3[Fe(СN)6] and 1,4-benzoquinone. Bioluminescent system of coupled enzymatic reactions catalyzed by NAD(P)H FMN-oxidoreductase and bacterial luciferase was used as a bioassay in vitro to monitor toxicity of the oxidizer solutions. Toxicities of general and oxidative types were evaluated using bioluminescent kinetic parameters-bioluminescence intensity and induction period, respectively. Antioxidant activity of HS was attributed to their ability to decrease both general and oxidative toxicities; the HS antioxidant efficiency was characterized with detoxification coefficients D GT and D OxT, respectively. Dependencies of D GT and D OxT on HS concentration and time of preliminary incubation of the oxidizers with HS were demonstrated. The optimal conditions for detoxification of the oxidizers were >20-min incubation time and 0.5 × 10(-4) to 2 × 10(-4) M of HS concentration. The present study promotes application of the enzymatic luminescent bioassay to monitor toxicity of pollutants of oxidative nature in environmental and waste waters in remediation procedures.
Collapse
Affiliation(s)
- A S Tarasova
- Siberian Federal University, Krasnoyarsk, Russia, 660041,
| | | | | |
Collapse
|
9
|
Kudryasheva NS, Tarasova AS. Pollutant toxicity and detoxification by humic substances: mechanisms and quantitative assessment via luminescent biomonitoring. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:155-167. [PMID: 25146119 DOI: 10.1007/s11356-014-3459-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2014] [Accepted: 08/14/2014] [Indexed: 06/03/2023]
Abstract
The paper considers mechanisms of detoxification of pollutant solutions by water-soluble humic substances (HSs), natural detoxifying agents. The problems and perspectives of bioassay application for toxicity monitoring of complex solutions are discussed from ecological point of view. Bioluminescence assays based on marine bacteria and their enzymes are of special attention here; they were shown to be convenient tools to study the detoxifying effects on cellular and biochemical levels. The advantages of bioluminescent enzymatic assay for monitoring both integral and oxidative toxicities in complex solutions of model pollutants and HS were demonstrated. The efficiencies of detoxification of the solutions of organic oxidizers and salts of metals (including radioactive ones) by HS were analyzed. The dependencies of detoxification efficiency on time of exposure to HS and HS concentrations were demonstrated. Antioxidant properties of HS were considered in detail. The detoxifying effects of HS were shown to be complex and regarded as 'external' (binding and redox processes in solutions outside the organisms) and/or 'internal' organismal processes. The paper demonstrates that the HS can stimulate a protective response of bacterial cells as a result of (1) changes of rates of biochemical reactions and (2) stabilization of mucous layers outside the cell walls. Acceleration of auto-oxidation of NADH, endogenous reducer, by HS was suggested as a reason for toxicity increase in the presence of HS due to abatement of reduction ability of intracellular media.
Collapse
Affiliation(s)
- N S Kudryasheva
- Institute of Biophysics SB RAS, Krasnoyarsk, Russia, 660036,
| | | |
Collapse
|
10
|
Tarasova AS, Stom DI, Kudryasheva NS. Effect of humic substances on toxicity of inorganic oxidizer bioluminescent monitoring. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2011; 30:1013-1017. [PMID: 21309025 DOI: 10.1002/etc.472] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2011] [Revised: 10/11/2010] [Accepted: 11/12/2010] [Indexed: 05/30/2023]
Abstract
The current study deals with the effect of humic substances (HS) on toxicity of solutions of a model inorganic oxidizer, potassium ferricyanide. Chemical reactions responsible for toxicity changes are under consideration. The bioluminescent system of coupled enzymatic reactions catalyzed by bacterial luciferase and oxidoreductase was used as a bioassay. General and oxidative toxicity of ferricyanide solutions were evaluated. Ability of HS to decrease or increase general and oxidative toxicity of the solutions was revealed. Two types of chemical processes are supposed to be responsible for detoxification by HS: ferricyanide-HS complex formation and acceleration of endogenous redox reactions in the bioluminescent assay system. Decrease of oxidative toxicity of ferricyanide solution was observed under incubation with HS at all concentrations of HS used. Conditions for general toxicity decrease were prior incubation of ferricyanide with HS and low HS concentrations (< 10⁻⁴g/L). Acceleration of NADH auto-oxidation under higher HS concentrations was supposed to result in a toxicity increase.
Collapse
|
11
|
Katafias A, Lipińska M, Strutyński K. Alkaline hydrogen peroxide as a degradation agent of methylene blue—kinetic and mechanistic studies. REACTION KINETICS MECHANISMS AND CATALYSIS 2010. [DOI: 10.1007/s11144-010-0234-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|