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Jamal RB, Bay Gosewinkel U, Ferapontova EE. Electrocatalytic aptasensor for bacterial detection exploiting ferricyanide reduction by methylene blue on mixed PEG/aptamer monolayers. Bioelectrochemistry 2024; 156:108620. [PMID: 38006817 DOI: 10.1016/j.bioelechem.2023.108620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2023] [Revised: 11/19/2023] [Accepted: 11/20/2023] [Indexed: 11/27/2023]
Abstract
Pathogen-triggered infections are the most severe global threat to human health, and to provide their timely treatment and prevention, robust methods for rapid and reliable identification of pathogenic microorganisms are required. Here, we have developed a fast and inexpensive electrocatalytic aptamer assay enabling specific and ultrasensitive detection of E. coli. E. coli, a biomarker of environmental contamination and infections, was captured on the mixed aptamer/thiolated PEG self-assembled monolayers formed on electrochemically pre-treated gold screen-printed electrodes (SPE). Signals from aptamer - E. coli binding were amplified by electrocatalytic reduction of ferricyanide mediated by methylene blue (MB) adsorbed on bacterial and aptamer surfaces. PEG operated as an antifouling agent and inhibited direct (not MB-mediated) discharge of ferricyanide. The assay allowed from 10 to 1000 CFU mL-1E. coli detection in 30 min, with no interference from B. subtilis, in buffer and artificial urine samples. This electrocatalytic approach is fast, specific, sensitive, and can be used directly in in-field and point-of-care applications for analysis of bacteria in human environment.
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Affiliation(s)
- Rimsha B Jamal
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark
| | - Ulrich Bay Gosewinkel
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399, DK-4000 Roskilde, Denmark
| | - Elena E Ferapontova
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark.
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2
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Petrova NZ, Tóth TN, Shetty P, Maróti G, Tóth SZ. Enhancing biophotovoltaic efficiency: Study on a highly productive green algal strain Parachlorella kessleri MACC-38. Bioresour Technol 2024; 394:130206. [PMID: 38122998 DOI: 10.1016/j.biortech.2023.130206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Revised: 12/12/2023] [Accepted: 12/12/2023] [Indexed: 12/23/2023]
Abstract
Biophotovoltaic (BPV) devices are a potential decentralized and environmentally friendly energy source that harness solar energy through photosynthesis. BPV devices are self-regenerating, promising long-term usability. A practical strategy for enhancing BPV performance is to systematically screen for highly exoelectrogenic algal strains capable of generating large electric current density. In this study, a previously uncharacterized green algal strain - Parachlorella kessleri MACC-38 was found to generate over 340 µA mg-1 Chl cm-2. This output is approximately ten-fold higher than those of Chlamydomonas reinhardtii and Chlorella species. The current production of MACC-38 primarily originates from photosynthesis, and the strain maintains its physiological integrity throughout the process. MACC-38 exhibits unique traits such as low extracellular O2 and Fe(III) reduction, substantial copper (II) reduction, and significant extracellular acidification during current generation, contributing to its high productivity. The exoelectrogenic and growth characteristics of MACC-38 suggest that it could markedly boost BPV efficiency.
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Affiliation(s)
- Nia Z Petrova
- Institute of Plant Biology, HUN-REN Biological Research Centre, Szeged, Temesvári krt. 62, H-6726 Szeged, Hungary.
| | - Tünde N Tóth
- Institute of Plant Biology, HUN-REN Biological Research Centre, Szeged, Temesvári krt. 62, H-6726 Szeged, Hungary.
| | - Prateek Shetty
- Institute of Plant Biology, HUN-REN Biological Research Centre, Szeged, Temesvári krt. 62, H-6726 Szeged, Hungary.
| | - Gergely Maróti
- Institute of Plant Biology, HUN-REN Biological Research Centre, Szeged, Temesvári krt. 62, H-6726 Szeged, Hungary.
| | - Szilvia Z Tóth
- Institute of Plant Biology, HUN-REN Biological Research Centre, Szeged, Temesvári krt. 62, H-6726 Szeged, Hungary.
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3
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Ouyang D, Han Y, Wang F, Zhao X. All-iron ions mediated electron transfer for biomass pretreatment coupling with direct generation of electricity from lignocellulose. Bioresour Technol 2022; 344:126189. [PMID: 34748975 DOI: 10.1016/j.biortech.2021.126189] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2021] [Revised: 10/18/2021] [Accepted: 10/19/2021] [Indexed: 06/13/2023]
Abstract
A coupled process of biomass pretreatment for increasing cellulose digestibility and direct conversion of biomass to electricity has been developed with ferric or ferricyanide ions as the anode electron carriers, and Fe(NO3)3 activated by HNO3 as the cathode electron carriers. Pretreated substrates are subjected to enzymatic hydrolysis for release of fermentable sugars, while the pretreatment liquor is employed as anolyte for electricity generation in a liquid flow fuel cell (LFFC). Pretreatment of sugarcane bagasse with 2 M FeCl3 in anode reactor removes ∼ 100% hemicelluloses and obtains 76% enzymatic glucan conversion (EGC), while pretreatment with 0.1 M K3[Fe(CN)6] in 0.5 M KOH achieves 78% lignin removal, 95.8% EGC and 85.1% xylan conversion. From 1000 g bagasse, 171.3 g fermentable sugars is produced with co-generation of 101.4 W·h electricity based on FeCl3 pretreatment, while 519 g fermentable sugars and 28.9 W·h electricity are obtained based on K3[Fe(CN)6] pretreatment.
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Affiliation(s)
- Denghao Ouyang
- Key Laboratory of Industrial Biocatalysis, Ministry of Education, Tsinghua University, Beijing 100084, PR China; Institute of Applied Chemistry, Department of Chemical Engineering, Tsinghua University, Beijing 100084, PR China
| | - Yazhu Han
- Key Laboratory of Industrial Biocatalysis, Ministry of Education, Tsinghua University, Beijing 100084, PR China; Institute of Applied Chemistry, Department of Chemical Engineering, Tsinghua University, Beijing 100084, PR China
| | - Fangqiang Wang
- Key Laboratory of Industrial Biocatalysis, Ministry of Education, Tsinghua University, Beijing 100084, PR China; Institute of Applied Chemistry, Department of Chemical Engineering, Tsinghua University, Beijing 100084, PR China
| | - Xuebing Zhao
- Key Laboratory of Industrial Biocatalysis, Ministry of Education, Tsinghua University, Beijing 100084, PR China; Institute of Applied Chemistry, Department of Chemical Engineering, Tsinghua University, Beijing 100084, PR China.
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4
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Mukosera GT, Liu T, Manaen M, Zhu L, Power G, Schroeder H, Blood AB. Deferoxamine produces nitric oxide under ferricyanide oxidation, blood incubation, and UV-irradiation. Free Radic Biol Med 2020; 160:458-470. [PMID: 32828952 PMCID: PMC11059783 DOI: 10.1016/j.freeradbiomed.2020.08.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 08/03/2020] [Accepted: 08/09/2020] [Indexed: 11/29/2022]
Abstract
Deferoxamine (DFO), an iron chelator, is used therapeutically for the removal of excess iron in multiple clinical conditions such as beta thalassemia and intracerebral hemorrhage. DFO is also used as an iron chelator and hypoxia-mimetic agent in in vivo and in vitro basic research. Here we unexpectedly discover DFO to be a nitric oxide (NO) precursor in experiments where it was intended to act as an iron chelator. Production of NO from aqueous solutions of DFO was directly observed by ozone-based chemiluminescence using a ferricyanide-based assay and was confirmed by electron paramagnetic resonance (EPR). DFO also produced NO following exposure to ultraviolet light, and its incubation with sheep adult and fetal blood resulted in considerable formation of iron nitrosyl hemoglobin, as confirmed by both visible spectroscopy and EPR. These results suggest that experiments using DFO can be confounded by concomitant production of NO, and offer new insight into some of DFO's unexplained clinical side effects such as hypotension.
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Affiliation(s)
- George T Mukosera
- Lawrence D Longo Center for Perinatal Biology and Department of Pediatrics, Loma Linda University, 11175 Campus Street, Loma Linda, CA, 92354, USA
| | - Taiming Liu
- Lawrence D Longo Center for Perinatal Biology and Department of Pediatrics, Loma Linda University, 11175 Campus Street, Loma Linda, CA, 92354, USA
| | - Meshach Manaen
- Lawrence D Longo Center for Perinatal Biology and Department of Pediatrics, Loma Linda University, 11175 Campus Street, Loma Linda, CA, 92354, USA
| | - Lingchao Zhu
- Department of Chemistry, University of California-Riverside 501 Big Springs Road, Riverside, CA 92521, USA
| | - Gordon Power
- Lawrence D Longo Center for Perinatal Biology and Department of Pediatrics, Loma Linda University, 11175 Campus Street, Loma Linda, CA, 92354, USA
| | - Hobe Schroeder
- Lawrence D Longo Center for Perinatal Biology and Department of Pediatrics, Loma Linda University, 11175 Campus Street, Loma Linda, CA, 92354, USA
| | - Arlin B Blood
- Lawrence D Longo Center for Perinatal Biology and Department of Pediatrics, Loma Linda University, 11175 Campus Street, Loma Linda, CA, 92354, USA.
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Lawson K, Rossi R, Regan JM, Logan BE. Impact of cathodic electron acceptor on microbial fuel cell internal resistance. Bioresour Technol 2020; 316:123919. [PMID: 32771939 DOI: 10.1016/j.biortech.2020.123919] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 07/22/2020] [Accepted: 07/24/2020] [Indexed: 05/11/2023]
Abstract
Ferricyanide is often used in microbial fuel cells (MFCs) to avoid oxygen intrusion that occurs with air cathodes. However, MFC internal resistances using ferricyanide can be larger than those with air cathodes even though ferricyanide results in higher power densities. Using a graphite fiber brush cathode and a ferricyanide catholyte (FC-B) the internal resistance was 62 ± 4 mΩ m2, with 84 ± 8 mΩ m2 obtained using ferricyanide and a flat carbon paper cathode (FC-F) and only 51 ± 1 mΩ m2 using a 70% porosity air cathode (A-70). The FC-B MFCs produced the highest maximum power density of all configurations examined: 2.46 ± 0.26 W/m2, compared to 1.33 ± 0.14 W/m2 for the A-70 MFCs. The electrode potential slope (EPS) analysis method showed that electrode resistances were similar for ferricyanide and air-cathode MFCs, and that higher power was due to the larger experimental working potential (500 ± 12 mV) of ferricyanide compared to the air cathode (233 ± 5 mV).
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Affiliation(s)
- Kathryn Lawson
- Department of Civil and Environmental Engineering, The Pennsylvania State University, 231Q Sackett Building, University Park, PA 16802, USA
| | - Ruggero Rossi
- Department of Civil and Environmental Engineering, The Pennsylvania State University, 231Q Sackett Building, University Park, PA 16802, USA
| | - John M Regan
- Department of Civil and Environmental Engineering, The Pennsylvania State University, 231Q Sackett Building, University Park, PA 16802, USA
| | - Bruce E Logan
- Department of Civil and Environmental Engineering, The Pennsylvania State University, 231Q Sackett Building, University Park, PA 16802, USA.
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6
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Zhang X, Rabiee H, Frank J, Cai C, Stark T, Virdis B, Yuan Z, Hu S. Enhancing methane oxidation in a bioelectrochemical membrane reactor using a soluble electron mediator. Biotechnol Biofuels 2020; 13:173. [PMID: 33088343 PMCID: PMC7568384 DOI: 10.1186/s13068-020-01808-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Accepted: 09/30/2020] [Indexed: 06/02/2023]
Abstract
BACKGROUND Bioelectrochemical methane oxidation catalysed by anaerobic methanotrophic archaea (ANME) is constrained by limited methane bioavailability as well as by slow kinetics of extracellular electron transfer (EET) of ANME. In this study, we tested a combination of two strategies to improve the performance of methane-driven bioelectrochemical systems that includes (1) the use of hollow fibre membranes (HFMs) for efficient methane delivery to the ANME organisms and (2) the amendment of ferricyanide, an effective soluble redox mediator, to the liquid medium to enable electrochemical bridging between the ANME organisms and the anode, as well as to promote EET kinetics of ANME. RESULTS The combined use of HFMs and the soluble mediator increased the performance of ANME-based bioelectrochemical methane oxidation, enabling the delivery of up to 196 mA m-2, thereby outperforming the control system by 244 times when HFMs were pressurized at 1.6 bar. CONCLUSIONS Improving methane delivery and EET are critical to enhance the performance of bioelectrochemical methane oxidation. This work demonstrates that by process engineering optimization, energy recovery from methane through its direct oxidation at relevant rates is feasible.
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Affiliation(s)
- Xueqin Zhang
- Advanced Water Management Centre, Faculty of Engineering, Architecture and Information Technology, The University of Queensland, Brisbane, 4072 Australia
| | - Hesamoddin Rabiee
- Advanced Water Management Centre, Faculty of Engineering, Architecture and Information Technology, The University of Queensland, Brisbane, 4072 Australia
| | - Joshua Frank
- Advanced Water Management Centre, Faculty of Engineering, Architecture and Information Technology, The University of Queensland, Brisbane, 4072 Australia
| | - Chen Cai
- Advanced Water Management Centre, Faculty of Engineering, Architecture and Information Technology, The University of Queensland, Brisbane, 4072 Australia
| | - Terra Stark
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, 4072 Australia
- Queensland Node of Metabolomics Australia, The University of Queensland, Brisbane, 4072 Australia
| | - Bernardino Virdis
- Advanced Water Management Centre, Faculty of Engineering, Architecture and Information Technology, The University of Queensland, Brisbane, 4072 Australia
| | - Zhiguo Yuan
- Advanced Water Management Centre, Faculty of Engineering, Architecture and Information Technology, The University of Queensland, Brisbane, 4072 Australia
| | - Shihu Hu
- Advanced Water Management Centre, Faculty of Engineering, Architecture and Information Technology, The University of Queensland, Brisbane, 4072 Australia
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Deihimi N, Irannajad M, Rezai B. Equilibrium and kinetic studies of ferricyanide adsorption from aqueous solution by activated red mud. J Environ Manage 2018; 227:277-285. [PMID: 30199723 DOI: 10.1016/j.jenvman.2018.08.089] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2018] [Revised: 08/15/2018] [Accepted: 08/23/2018] [Indexed: 06/08/2023]
Abstract
In this study, activated red mud (ARM) was used as a new adsorbent for the removal of ferricyanide anions from aqueous solution. Based on the percentage of ferricyanide removal and ferricyanide adsorption capacity, optimum conditions were evaluated using the response surface method (RSM) and central composite design (CCD). In optimum conditions (pH = 5.6, adsorbent dosage of 2.59 g, ferricyanide concentration of 60 ppm and contact time of 60 min), the percentage of ferricyanide removal and ferricyanide adsorption capacity were obtained as 79.6% and 1.8 mg/g, respectively. The kinetics and equilibrium studies were evaluated by considering the effective parameters including pH and ferricyanide concentration. Kinetic studies were evaluated by kinetic models of pseudo first-order, pseudo-second-order (four different linearized forms), Elovich and intraparticle diffusion. The results of the kinetic study indicated that the mechanism of ferricyanide adsorption onto the ARM adsorbent is a chemisorption interaction by a fast ferricyanide adsorption onto ARM and subsequently the slow diffusion of ferricyanide ions into the ARM inner adsorption sites. The equilibrium studies showed that the adsorption process followed the Langmuir model in which ferricyanide adsorption onto ARM was homogeneous with monolayer adsorption. The results indicated that the activation process of red mud improved adsorbent efficiency and increased the adsorption capacity.
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Affiliation(s)
- Nazanin Deihimi
- Department of Mining & Metallurgical Eng., Amirkabir University of Technology, Tehran, Iran
| | - Mehdi Irannajad
- Department of Mining & Metallurgical Eng., Amirkabir University of Technology, Tehran, Iran.
| | - Bahram Rezai
- Department of Mining & Metallurgical Eng., Amirkabir University of Technology, Tehran, Iran
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Deihimi N, Irannajad M, Rezai B. Characterization studies of red mud modification processes as adsorbent for enhancing ferricyanide removal. J Environ Manage 2018; 206:266-275. [PMID: 29096140 DOI: 10.1016/j.jenvman.2017.10.037] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Revised: 10/10/2017] [Accepted: 10/18/2017] [Indexed: 06/07/2023]
Abstract
In this study, waste solids of the alumina industry (red mud) have been modified and utilized as a ferricyanide adsorbent which is characterized by XRD, XRF, FTIR, SEM, EDX, ICP and BET analysis. The four modification methods including the processes of washing with seawater (B), acid treatment Bauxsol (ATB), activated ATB using ammonia (ABA), and activated Bauxsol using cetyltrimethylammonium bromide (CTAB) (ABC) were evaluated to increase the reactivity of red mud (RM) for ferricyanide removal. The ferricyanide adsorption capacity was obtained at 12.40, 6.84, 2.95, 2.50 and 0.44 (mg/g) for ABC, ATB, ABA, B and RM, respectively. The CTAB with a concentration above the critical micelle concentration changed the negative charge of red mud to positive charge. It decreased the negative charge repulsion force between the Bauxsol surface and ferricyanide ions. The adsorption capacity of ferricyanide was decreased from 12.40 to 2.75 (mg/g) with increasing the adsorbent amount from 0.5 to 5 (g). The results showed that the activated Bauxsol using CTAB could be effectively used as a new adsorbent for ferricyanide ions from wastewaters.
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Affiliation(s)
- Nazanin Deihimi
- Department of Mining & Metallurgical Eng., Amirkabir University of Technology, Tehran, Iran
| | - Mehdi Irannajad
- Department of Mining & Metallurgical Eng., Amirkabir University of Technology, Tehran, Iran.
| | - Bahram Rezai
- Department of Mining & Metallurgical Eng., Amirkabir University of Technology, Tehran, Iran
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9
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Bogdanović Pristov J, Spasojević I. A One-Step Staining Protocol for In-Gel Fluorescent Visualization of Proteins. Methods Mol Biol 2018; 1853:149-158. [PMID: 30097940 DOI: 10.1007/978-1-4939-8745-0_18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Native polyacrylamide gel electrophoresis (PAGE) and sodium dodecyl sulfate (SDS)-PAGE are among the most frequently applied techniques in protein analysis. Here we describe a fast one-step method for fluorescent visualization of proteins. Following PAGE, gels are soaked in solution of potassium ferricyanide (100 mM) in 1 M NaOH, and are kept in the dark for 30 min. Gels are then transferred to water and scanned. The sensitivity of the method is comparable with standard Coomassie Brilliant Blue staining.
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Affiliation(s)
- Jelena Bogdanović Pristov
- Department of Life Sciences, Institute for Multidisciplinary Research, University of Belgrade, Belgrade, Serbia.
| | - Ivan Spasojević
- Department of Life Sciences, Institute for Multidisciplinary Research, University of Belgrade, Belgrade, Serbia.
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Soriano-Disla JM, Janik LJ, McLaughlin MJ. Assessment of cyanide contamination in soils with a handheld mid-infrared spectrometer. Talanta 2017; 178:400-409. [PMID: 29136840 DOI: 10.1016/j.talanta.2017.08.106] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Revised: 08/28/2017] [Accepted: 08/30/2017] [Indexed: 10/18/2022]
Abstract
We examined the feasibility of using handheld mid-infrared (MIR) Fourier-Transform infrared (FT-IR) instrumentation for detecting and analysing cyanide (CN) contamination in field contaminated soils. Cyanide spiking experiments were first carried out, in the laboratory, to test the sensitivity of infrared Fourier transform (DRIFT) spectrometry to ferro- and ferricyanide compounds across a range of reference soils and minerals. Both benchtop and handheld diffuse reflectance infrared spectrometers were tested. Excellent results were obtained for the reference soils and minerals, with the MIR outperforming the near-infrared (NIR) range. Spectral peaks characteristic of the -C≡N group were observed near 2062 and 2118cm-1 in the MIR region for the ferro- and ferricyanide compounds spiked into soils/minerals, respectively. In the NIR region such peaks were observed near 4134 and 4220cm-1. Cyanide-contaminated samples were then collected in the field and analyzed with the two spectrometers to further test the applicability of the DRIFT technique for soils containing aged CN residues. The prediction of total CN in dry and ground contaminated soils using the handheld MIR instrument resulted in a coefficient of determination (R2) of 0.88-0.98 and root mean square error of the cross-validation (RMSE) of 21-49mgkg-1 for a CN range of 0-611mgkg-1. A major peak was observed in the MIR at about 2092cm-1 which was attributed to "Prussian Blue" (Fe4[Fe(CN)6]3·xH2O). These results demonstrate the potential of handheld DRIFT instrumentation as a promising alternative to the standard laboratory method to predict CN concentrations in contaminated field soils.
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Affiliation(s)
- José M Soriano-Disla
- CSIRO Environmental Contaminant Mitigation and Technologies Program, CSIRO Land and Water, Waite Campus, Waite Road, Urrbrae 5064, South Australia, Australia; Sustainable Use, Management and Reclamation of Soil and Water Research Group (GARSA), Universidad Politécnica de Cartagena, Paseo Alfonso XIII 48, 30203 Cartagena, Spain.
| | - Leslie J Janik
- CSIRO Environmental Contaminant Mitigation and Technologies Program, CSIRO Land and Water, Waite Campus, Waite Road, Urrbrae 5064, South Australia, Australia
| | - Michael J McLaughlin
- CSIRO Environmental Contaminant Mitigation and Technologies Program, CSIRO Land and Water, Waite Campus, Waite Road, Urrbrae 5064, South Australia, Australia; School of Agriculture, Food and Wine, University of Adelaide, Waite Campus, Waite Road, Urrbrae 5064, South Australia, Australia
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11
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Sun C. Removal of the H subunit results in enhanced exposure of the semiquinone sites in the LM dimer from Rhodobacter sphaeroides to oxidation by ferricyanide and by O 2. Photosynth Res 2017; 133:371-377. [PMID: 28540587 DOI: 10.1007/s11120-017-0404-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Accepted: 05/17/2017] [Indexed: 06/07/2023]
Abstract
Bacterial reaction centers (RC) from Rhodobacter sphaeroides have been widely used to functionalize electrodes and to generate photocurrent. However, in most studies, direct electron transfer from the semiquinone to the electrode was not observed because the H subunit of the RC shields the semiquinone. It is demonstrated in the current work that removal of the H subunit effectively exposes the semiquinone sites in the LM dimer. This is demonstrated by measuring the second-order rate constant for the reaction between ferricyanide and the anionic semiquinone Q A- formed by an actinic flash. The rate constant increases 1000-fold for Q A- oxidation by ferricyanide in the LM dimer compared to the intact RC. The second-order rate constant approaches the diffusion limit of 6 × 109 M-1·s-1 at low pH, but it decreases steadily when the pH is above 6.5. This pH dependence suggests that the protonation state of the LM dimer plays an important role in controlling the electron transfer kinetics. It is also shown that the addition of exogenous ubiquinone to replenish the QB site, which is mostly empty in the LM dimer, leads to oxidation of Q A- by O2 following an actinic flash. It is concluded that removal of the H subunit results in exposure of the semiquinone sites of the LM dimer to externally added oxidants and may provide a strategy for enhancing direct electron transfer from the RC to an electrode.
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Affiliation(s)
- Chang Sun
- Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA.
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12
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Song Y, Chen J, Sun M, Gong C, Shen Y, Song Y, Wang L. A simple electrochemical biosensor based on AuNPs/MPS/Au electrode sensing layer for monitoring carbamate pesticides in real samples. J Hazard Mater 2016; 304:103-9. [PMID: 26547618 DOI: 10.1016/j.jhazmat.2015.10.058] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2015] [Revised: 09/23/2015] [Accepted: 10/25/2015] [Indexed: 05/21/2023]
Abstract
A simple electrochemical biosensor for quantitative determination of carbamate pesticide was developed based on a sensing interface of citrate-capped gold nanoparticles (AuNPs)/(3-mercaptopropyl)-trimethoxysilane (MPS)/gold electrode (Au). The biosensor was fabricated by firstly assembling three-dimensional (3D) MPS networks on Au electrode and subsequently assembling citrate-capped AuNPs on 3D MPS network via AuS bond. The interface of AuNPs/MPS/Au was negatively charged originating from the citrate coated on AuNPs that would repulse the negatively charged ferricyanide ([Fe(CN)6](3-/4-)) to produce a negative response. In the presence of acetylcholinesterase (AChE) and acetylthiocholine (ATCl), the AChE catalyzes the hydrolysis of ATCl into positively charged thiocholine which would replace the citrate on AuNPs through the strong AuS bond and convert the negative charged surface to be positively charged. The resulted positively charged AuNPs/MPS/Au then attracted the [Fe(CN)6](3-/4-) to produce a positive response. Based on the inhibition of carbamate pesticides on the activity of AChE, the pesticide could be quantitatively determined at a very low potential. The linear range was from 0.003 to 2.00 μM. The sensing platform was also proved to be suitable for carbamate pesticides detection in practical sample.
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Affiliation(s)
- Yonghai Song
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, 99 Ziyang Road, Nanchang 330022, China
| | - Jingyi Chen
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, 99 Ziyang Road, Nanchang 330022, China
| | - Min Sun
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, 99 Ziyang Road, Nanchang 330022, China
| | - Coucong Gong
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, 99 Ziyang Road, Nanchang 330022, China
| | - Yuan Shen
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, 99 Ziyang Road, Nanchang 330022, China
| | - Yonggui Song
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, 99 Ziyang Road, Nanchang 330022, China
| | - Li Wang
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, 99 Ziyang Road, Nanchang 330022, China.
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Pristov JB, Opačić M, Dimitrijević M, Babić N, Spasojević I. A method for in-gel fluorescent visualization of proteins after native and sodium dodecyl sulfate polyacrylamide gel electrophoresis. Anal Biochem 2015; 480:6-10. [PMID: 25862081 DOI: 10.1016/j.ab.2015.04.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Revised: 03/29/2015] [Accepted: 04/03/2015] [Indexed: 11/22/2022]
Abstract
We have developed a simple one-step 30-min method for fluorescent visualization of proteins in native and sodium dodecyl sulfate polyacrylamide gel electrophoresis (PAGE) gels. The method is based on formation of strong fluorophores via potassium ferricyanide-provoked oxidation of tryptophan (Trp). Following PAGE, gels are soaked in water solution of potassium ferricyanide (100 mM) and NaOH (1 M) and are kept in the dark for 30 min. Gels are then transferred to water and scanned. The sensitivity of the method was slightly lower compared with standard Coomassie Brilliant Blue (CBB) staining. The method can be useful when rapid acquisition of data is of the essence. After preview, gels can be post-stained using the CBB protocol for further analysis. The intensity of fluorescence is dependent on Trp number, so the protocol might find application in the quantification of Trp residues as illustrated here. Importantly, there is room for improvement of the method. Namely, according to excitation-emission matrix analysis of stained protein bands, maximal fluorescence intensity (at 345/460 nm) was 3.5-fold higher compared with the settings that were available on a commercial imager (395/525 nm). As a supplement, we present an upgrade of the previously described method for in-gel detection of non-heme iron-binding proteins that also employs potassium ferricyanide.
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Liddicoat C, Hucker B, Liang H, Vriesekoop F. Thiamin analysis in red wine by fluorescence reverse phase-HPLC. Food Chem 2015; 177:325-9. [PMID: 25660893 DOI: 10.1016/j.foodchem.2015.01.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Revised: 11/11/2014] [Accepted: 01/04/2015] [Indexed: 01/03/2023]
Abstract
The derivatization of thiamin vitamers to their respective thiochrome by ferricyanide to facilitate fluorescence detection following separation by HPLC provides a powerful analytical tool. However the polyphenolic compounds in red wine readily interact with ferricyanide, reducing the effectiveness of ferricyanide oxidation in the derivatization of thiamin. We describe a method to facilitate the removal of polyphenolic compounds that interfere with the ferricyanide derivatization of thiamin. Polyvinylpolypyrrolidone afforded the total removal of phenolic compounds from red wines and allowed a spike recovery of thiamin vitamers (101% for thiamin; 104% for TMP; and 100% for TDP) in a wide range of red wines. This research found that Merlot styles of red wine contained the highest concentration of total thiamin (29.01 ng/mL) while Pinot Noir wines contained the lowest total concentration (8.27 ng/mL).
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Affiliation(s)
- Callum Liddicoat
- Institute of Food and Crop Science, School of Health Sciences, Federation University Australia, Post Office Box 663, Ballarat 3353, Victoria, Australia
| | - Barry Hucker
- Institute of Food and Crop Science, School of Health Sciences, Federation University Australia, Post Office Box 663, Ballarat 3353, Victoria, Australia
| | - Hao Liang
- Institute of Food and Crop Science, School of Health Sciences, Federation University Australia, Post Office Box 663, Ballarat 3353, Victoria, Australia; State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, PR China
| | - Frank Vriesekoop
- Institute of Food and Crop Science, School of Health Sciences, Federation University Australia, Post Office Box 663, Ballarat 3353, Victoria, Australia; Department of Food Science and Agri-Food Supply Chain Management, Harper Adams University, Newport, Shropshire TF10 8NB, United Kingdom.
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Matsumae Y, Takahashi Y, Ino K, Shiku H, Matsue T. Electrochemical monitoring of intracellular enzyme activity of single living mammalian cells by using a double-mediator system. Anal Chim Acta 2014; 842:20-6. [PMID: 25127647 DOI: 10.1016/j.aca.2014.06.047] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Revised: 06/25/2014] [Accepted: 06/27/2014] [Indexed: 11/16/2022]
Abstract
UNLABELLED We evaluated the intracellular NAD(P)H quinone oxidoreductase (NQO) activity of single HeLa cells by using the menadione-ferrocyanide double-mediator system combined with scanning electrochemical microscopy (SECM). The double-mediator system was used to amplify the current response from the intracellular NQO activity and to reduce menadione-induced cell damage. The electron shuttle between the electrode and menadione was mediated by the ferrocyanide/ferricyanide redox couple. Generation of ferrocyanide was observed immediately after the addition of a lower concentration (10 μM) of menadione. The ferrocyanide generation rate was constant for 120 min. At a higher menadione concentration (100 μM), the ferrocyanide generation rate decreased within 30 min because of the cytotoxic effect of menadione. We also investigated the relationship between intracellular reactive oxygen species or glutathione levels and exposure to different menadione concentrations to determine the optimal condition for SECM with minimal invasiveness. The present study clearly demonstrates that SECM is useful for the analysis of intracellular enzymatic activities in single cells with a double-mediator system.
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Affiliation(s)
- Yoshiharu Matsumae
- Graduate School of Environmental Studies, Tohoku University, Aramaki 6-6-11-605, Aoba, Sendai 980-8579, Japan
| | - Yasufumi Takahashi
- Advanced Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba, Sendai 980-8577, Japan
| | - Kosuke Ino
- Graduate School of Environmental Studies, Tohoku University, Aramaki 6-6-11-605, Aoba, Sendai 980-8579, Japan
| | - Hitoshi Shiku
- Graduate School of Environmental Studies, Tohoku University, Aramaki 6-6-11-605, Aoba, Sendai 980-8579, Japan.
| | - Tomokazu Matsue
- Graduate School of Environmental Studies, Tohoku University, Aramaki 6-6-11-605, Aoba, Sendai 980-8579, Japan; Advanced Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba, Sendai 980-8577, Japan.
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Schöpke C, Taylor NJ, Cárcamo R, Beachy RN, Fauquet C. Optimization of parameters for particle bombardment of embryogenic suspension cultures of cassava (Manihot esculenta Crantz) using computer image analysis. Plant Cell Rep 1997; 16:526-530. [PMID: 30727572 DOI: 10.1007/bf01142317] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/1996] [Revised: 12/30/1996] [Accepted: 01/02/1997] [Indexed: 06/09/2023]
Abstract
Tissue derived from embryogenic suspension cultures of cassava was bombarded with microparticles coated with a plasmid containing theuidA gene, which codes forβ-glucuronidase (GUS). After 3 days, the effect of different bombardment parameters was evaluated by comparing the numbers of blue spots that resulted from histological GUS assays. Counting of blue spots was performed using a system comprised of a black and white video camera, a stereoscope and a personal computer. A reproducible counting method was established by optimizing GUS assay conditions, preparation of tissue samples and acquisition of video images in view of attaining the highest possible contrast between the blue spots and the surrounding tissue. The effects of bombardment pressure, microparticle size, number of bombardments, and osmotic pretreatment on GUS expression were investigated. Optimal transient expression of theuidA gene was observed after bombardment at 1100 psi, with a particle size of 1 µm, an osmotic pretreatment and two bombardments per sample. The highest number of blue spots observed was 2400 per square centimeter of bombarded tissue.
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Affiliation(s)
- C Schöpke
- International Laboratory for Tropical Agricultural Biotechnology (ILTAB/ORSTOM-TSRI), Division of Plant Biology - BCC 206, The Scripps Research Institute, 10550 North Torrey Pines Road, 92037, La Jolla, CA, USA
| | - N J Taylor
- International Laboratory for Tropical Agricultural Biotechnology (ILTAB/ORSTOM-TSRI), Division of Plant Biology - BCC 206, The Scripps Research Institute, 10550 North Torrey Pines Road, 92037, La Jolla, CA, USA
| | - R Cárcamo
- International Laboratory for Tropical Agricultural Biotechnology (ILTAB/ORSTOM-TSRI), Division of Plant Biology - BCC 206, The Scripps Research Institute, 10550 North Torrey Pines Road, 92037, La Jolla, CA, USA
| | - R N Beachy
- International Laboratory for Tropical Agricultural Biotechnology (ILTAB/ORSTOM-TSRI), Division of Plant Biology - BCC 206, The Scripps Research Institute, 10550 North Torrey Pines Road, 92037, La Jolla, CA, USA
| | - C Fauquet
- International Laboratory for Tropical Agricultural Biotechnology (ILTAB/ORSTOM-TSRI), Division of Plant Biology - BCC 206, The Scripps Research Institute, 10550 North Torrey Pines Road, 92037, La Jolla, CA, USA
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