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Wang H, Han M, Wang M, Zhou H. Microheterogeneous Triplet Oxidation of Hydrophobic Organic Contaminants in Dissolved Black Carbon Solutions under Simulated Solar Irradiation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:14574-14584. [PMID: 36173710 DOI: 10.1021/acs.est.2c06395] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Dissolved black carbon (DBC) is proven to accelerate the triplet-mediated photodegradation of hydrophobic organic contaminants (HOCs). However, its photosensitization mechanisms are not clear. In this study, five HOCs including 2,4,6-trimethylphenol, N,N-dimethylaniline, 17β-estradiol, 17α-ethinylestradiol, and bisphenol A were selected as model compounds to explore the triplet-mediated phototransformation of HOCs in illuminated DBC solutions. All five HOCs presented high organic carbon-water partition coefficient (KOC) values in DBC solutions, indicating the strong sorption capacity of DBC for HOCs. When reaching sorption equilibrium, the apparent pseudo-first-order rate constants of HOCs vs log[DBC] were well fitted with a sorption-enhanced phototransformation model (R2 > 0.98). Using the sorption-enhanced phototransformation model, the degradation rates of HOCs determined at intra-DBC (kDBC,HOCs') were 1-2 orders of magnitude higher than those observed in aqueous bulk solution (kHOCsaq). Moreover, typical triplet quenchers (2,4,6-trimethylphenol and oxygen) exhibited a microheterogeneous quenching effect on the triplet-mediated photodegradation of 17β-estradiol. Therefore, our results suggested that HOCs underwent a microheterogeneous photooxidative degradation process in DBC solutions. Furthermore, a sorption-enhanced phototransformation mechanism was proposed to elucidate the microheterogeneous photooxidative behavior of HOCs in DBC solutions. This study provides new insights into the fate and transport of HOCs in aquatic environments.
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Affiliation(s)
- Hui Wang
- School of Resources and Environmental Engineering, Jiangsu University of Technology, Changzhou213001, P. R. China
- Department of Environmental Science & Engineering, Fudan University, Shanghai200433, P. R. China
| | - Mengqi Han
- College of Environmental Science & Engineering, Tongji University, Shanghai200092, P. R. China
| | - Mei Wang
- College of Environmental Science & Engineering, Tongji University, Shanghai200092, P. R. China
| | - Huaxi Zhou
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai201418, P. R. China
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Bhuiyan MSA, Liu B, Manuel J, Zhao B, Lee BP. Effect of Conductivity on In Situ Deactivation of Catechol-Boronate Complexation-Based Reversible Smart Adhesive. Biomacromolecules 2021; 22:4004-4015. [PMID: 34410693 DOI: 10.1021/acs.biomac.1c00802] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
To reduce the need for elevated electrical potential to deactivate catechol-based smart adhesive and preserve its reversibility, conductive 1-pyrenemethyl methacrylate (PyMA) was incorporated into a catechol and phenylboronic acid-containing adhesive coating immobilized on aluminum (Al) discs. Electrochemical impedance spectroscopy (EIS) indicated that incorporation of 26 mol % of PyMA reduced ionic resistance (Rs) and charge-transfer resistance (Rc) of the coating from over 22 Ω/mm2 to 5.9 and 1.2 Ω/mm2, respectively. A custom-built Johnson-Kendall-Roberts (JKR) contact mechanics test setup was used to evaluate the adhesive property of the coating with in situ applied electricity using a titanium (Ti) sphere both as a test substrate as well as the cathode for application of electricity and the Al disc as the anode. The adhesive coating demonstrated over 95% reduction in the adhesive property when electricity (1-2 V) was applied while the adhesive was in direct contact with the Ti surface. The addition of PyMA enables the deactivation of the adhesive using a voltage as low as 1 V. Both cyclic voltammetry (CV) and attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectra confirmed the formation of catechol-boronate complexation through electrochemical stimulation. Breaking the complex with an acidic buffer (pH 3) recovered the catechol for strong wet adhesion and the coating could be repeatedly deactivated and reactivated using low electrical potential for up to five cycles. Incorporation of both conductive PyMA and boronic acid as the temporary protecting group was required to achieve rapidly switchable adhesive that could be deactivated with low applied voltage.
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Affiliation(s)
- Md Saleh Akram Bhuiyan
- Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan 49931, United States
| | - Bo Liu
- Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan 49931, United States.,Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - James Manuel
- Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan 49931, United States
| | - Bin Zhao
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Bruce P Lee
- Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan 49931, United States
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Josephson B, Fehl C, Isenegger PG, Nadal S, Wright TH, Poh AWJ, Bower BJ, Giltrap AM, Chen L, Batchelor-McAuley C, Roper G, Arisa O, Sap JBI, Kawamura A, Baldwin AJ, Mohammed S, Compton RG, Gouverneur V, Davis BG. Light-driven post-translational installation of reactive protein side chains. Nature 2020; 585:530-537. [PMID: 32968259 DOI: 10.1038/s41586-020-2733-7] [Citation(s) in RCA: 84] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Accepted: 07/15/2020] [Indexed: 02/07/2023]
Abstract
Post-translational modifications (PTMs) greatly expand the structures and functions of proteins in nature1,2. Although synthetic protein functionalization strategies allow mimicry of PTMs3,4, as well as formation of unnatural protein variants with diverse potential functions, including drug carrying5, tracking, imaging6 and partner crosslinking7, the range of functional groups that can be introduced remains limited. Here we describe the visible-light-driven installation of side chains at dehydroalanine residues in proteins through the formation of carbon-centred radicals that allow C-C bond formation in water. Control of the reaction redox allows site-selective modification with good conversions and reduced protein damage. In situ generation of boronic acid catechol ester derivatives generates RH2C• radicals that form the native (β-CH2-γ-CH2) linkage of natural residues and PTMs, whereas in situ potentiation of pyridylsulfonyl derivatives by Fe(II) generates RF2C• radicals that form equivalent β-CH2-γ-CF2 linkages bearing difluoromethylene labels. These reactions are chemically tolerant and incorporate a wide range of functionalities (more than 50 unique residues/side chains) into diverse protein scaffolds and sites. Initiation can be applied chemoselectively in the presence of sensitive groups in the radical precursors, enabling installation of previously incompatible side chains. The resulting protein function and reactivity are used to install radical precursors for homolytic on-protein radical generation; to study enzyme function with natural, unnatural and CF2-labelled post-translationally modified protein substrates via simultaneous sensing of both chemo- and stereoselectivity; and to create generalized 'alkylator proteins' with a spectrum of heterolytic covalent-bond-forming activity (that is, reacting diversely with small molecules at one extreme or selectively with protein targets through good mimicry at the other). Post-translational access to such reactions and chemical groups on proteins could be useful in both revealing and creating protein function.
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Affiliation(s)
- Brian Josephson
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
| | - Charlie Fehl
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
- Department of Chemistry, Wayne State University, Detroit, MI, USA
| | - Patrick G Isenegger
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
| | - Simon Nadal
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
| | - Tom H Wright
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
- Department of Molecular Biology, Massachusetts General Hospital, Boston, MA, USA
| | - Adeline W J Poh
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
| | - Ben J Bower
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
| | - Andrew M Giltrap
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
- The Rosalind Franklin Institute, Harwell, UK
| | - Lifu Chen
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
| | | | - Grace Roper
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
| | - Oluwatobi Arisa
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
| | - Jeroen B I Sap
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
| | - Akane Kawamura
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
| | - Andrew J Baldwin
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
| | - Shabaz Mohammed
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
- The Rosalind Franklin Institute, Harwell, UK
- Department of Biochemistry, University of Oxford, Oxford, UK
| | - Richard G Compton
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford, UK
| | - Veronique Gouverneur
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK.
| | - Benjamin G Davis
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, UK.
- The Rosalind Franklin Institute, Harwell, UK.
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Bhuiyan MSA, Roland JD, Liu B, Reaume M, Zhang Z, Kelley JD, Lee BP. In Situ Deactivation of Catechol-Containing Adhesive Using Electrochemistry. J Am Chem Soc 2020; 142:4631-4638. [PMID: 32046478 PMCID: PMC7068691 DOI: 10.1021/jacs.9b11266] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Marine mussels secret catechol-containing adhesive proteins that enable these organisms to bind to various surfaces underwater. Synthetic mimics of these proteins have been created to function as adhesives and coatings for a wide range of applications. Here, we demonstrated the use of in situ electrical field stimulation to deactivate the adhesive property of catechol-containing adhesive that is in direct contact with a surface. Johnson-Kendall-Roberts (JKR) contact mechanics test was performed using a titanium (Ti) sphere in the presence of a pH 7.5 aqueous buffer. The Ti sphere also served as a conductive electrode for applying electricity to the adhesive, while a platinum (Pt) wire served as the counter electrode. Work of adhesion (Wadh) decreased with increased levels of applied voltage and current, exposure time to the applied electricity, and salt concentration of the interfacial buffer. Application of 9 V for 1 min completely deactivated the adhesive. UV-vis diffuse reflectance spectra and tracking of catechol oxidation byproduct, hydrogen peroxide, confirmed that catechol was oxidized as a result of applied electricity. Contact mechanics testing further confirmed that the Young's modulus of the adhesive increased by nearly 4 folds at the interface as a result of oxidative cross-linking, even though the modulus of the bulk of the adhesive was unaffected by applied electricity. The accumulation of hydroxyl ions near the cathode increased the local solution pH, which promoted oxidation-induced cross-linking of catechol and subsequently decreased its adhesive property. Tuning adhesive properties through in situ electrochemical oxidation provides on-demand control over the adhesive, which will potentially add another dimension in designing synthetic mimics of mussel adhesive proteins.
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Affiliation(s)
- Md. Saleh Akram Bhuiyan
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI-49931, USA
| | - James D. Roland
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI-49931, USA
| | - Bo Liu
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI-49931, USA
| | - Max Reaume
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI-49931, USA
| | - Zhongtian Zhang
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI-49931, USA
| | - Jonathan D. Kelley
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI-49931, USA
| | - Bruce P. Lee
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI-49931, USA
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