The DOI matches its Crossref record; 5 of the 5 references it cites were found in a registry or an index.
Antioxidant Properties of Humic Substances
Abstract
Humic substances (HS) are heterogeneous, redox-active organic macromolecules. While electron transfer to and from HS under reducing conditions is well investigated, comparatively little is known on the electron donating (i.e., antioxidant) properties of HS under oxic conditions. In this work, the electron donating capacities (EDCs) of terrestrial and aquatic HS were quantified by mediated electrochemical oxidation over a wide range of pH values and applied redox potentials (E(h)) using 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) as an electron transfer mediator. Electrochemical oxidation of three model humic acids (HAs) was largely irreversible, and the EDCs of these HAs increased with increasing E(h) and pH. These results suggest that HS contain a wide variety of moieties that are oxidized at different potentials and that, upon oxidation, release protons and undergo irreversible follow-up reactions. At a given pH and E(h), the EDCs of the HS correlated well with their titrated phenol contents suggesting phenolic moieties as major electron donating groups in HS. Comparing the EDCs of 15 HS with their electron accepting capacities (EACs), aquatic HS had higher EDCs and lower EACs than terrestrial HS of comparable aromaticities. These results indicate that oxidative transformation of HS in the environment results in a depletion of electron donating phenolic moieties with antioxidant properties relative to the electron accepting quinone moieties.
Overview
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Citations
Cites
Structure-antioxidant activity relationships of flavonoids and phenolic acids
Rice-Evans, C. A., Miller, N. J., & Paganga, G. (1996) · Free Radical Biology and Medicine · doi:10.1016/0891-5849(95)02227-9 · Cited by 9,085
The Chemistry behind Antioxidant Capacity Assays
Huang, D., Ou, B., & Prior, R. L. (2005) · Journal of Agricultural and Food Chemistry · doi:10.1021/jf030723c · Cited by 6,162
Polyphenols: Chemistry, dietary sources, metabolism, and nutritional significance
Bravo, L. (2009) · Nutrition Reviews · doi:10.1111/j.1753-4887.1998.tb01670.x · Cited by 4,030
Humic substances as electron acceptors for microbial respiration
Lovley, D. R., Coates, J. D., Blunt-Harris, E. L., Phillips, E. J. P., & Woodward, J. C. (1996) · Nature · doi:10.1038/382445a0 · Cited by 1,834
Advertisement: Clark's Oxidation Reduction Potentials of Organic Systems
Clark, W. (1960) · The Journal of Physical Chemistry · doi:10.1021/j100830a600 · Cited by 64
Cited by
Activation of Peroxymonosulfate by Benzoquinone: A Novel Nonradical Oxidation Process
Zhou, Y., Jiang, J., Gao, Y., Ma, J., Pang, S.-Y., Li, J., Lu, X.-T., & Yuan, L.-P. (2015) · Environmental Science & Technology · doi:10.1021/acs.est.5b03595 · Cited by 1,294
Redox Properties of Plant Biomass-Derived Black Carbon (Biochar)
Klüpfel, L., Keiluweit, M., Kleber, M., & Sander, M. (2014) · Environmental Science & Technology · doi:10.1021/es500906d · Cited by 1,119
Self-citationRapid electron transfer by the carbon matrix in natural pyrogenic carbon
Sun, T., Levin, B. D. A., Guzman, J. J. L., Enders, A., Muller, D. A., Angenent, L. T., & Lehmann, J. (2017) · Nature Communications · doi:10.1038/ncomms14873 · Cited by 626
Coupled iron cycling and organic matter transformation across redox interfaces
Dong, H., Zeng, Q., Sheng, Y., Chen, C., Yu, G., & Kappler, A. (2023) · Nature Reviews Earth & Environment · doi:10.1038/s43017-023-00470-5 · Cited by 477
Multiple Roles of Dissolved Organic Matter in Advanced Oxidation Processes
Yang, X., Rosario-Ortiz, F. L., Lei, Y., Pan, Y., Lei, X., & Westerhoff, P. (2022) · Environmental Science & Technology · doi:10.1021/acs.est.2c01017 · Cited by 459
Xu, X., Huang, H., Zhang, Y., Xu, Z., & Cao, X. (2019) · Environmental Pollution · doi:10.1016/j.envpol.2018.10.068 · Cited by 414
Photochemically induced formation of reactive oxygen species (ROS) from effluent organic matter
Zhang, D., Yan, S., & Song, W. (2014) · Environmental Science & Technology · doi:10.1021/es5028663 · Cited by 385
Wood-Derived Black Carbon (Biochar) as a Microbial Electron Donor and Acceptor
Saquing, J. M., Yu, Y.-H., & Chiu, P. C. (2016) · Environmental Science & Technology Letters · doi:10.1021/acs.estlett.5b00354 · Cited by 353
Dark Formation of Hydroxyl Radical in Arctic Soil and Surface Waters
Page, S. E., Kling, G. W., Sander, M., Harrold, K. H., Logan, J. R., McNeill, K., & Cory, R. M. (2013) · Environmental Science & Technology · doi:10.1021/es4033265 · Cited by 300
Self-citationSharpless, C. M., Aeschbacher, M., Page, S. E., Wenk, J., Sander, M., & McNeill, K. (2014) · Environmental Science & Technology · doi:10.1021/es403925g · Cited by 268
Self-citation
Metadata
- Authors
- Aeschbacher, M., Graf, C., Schwarzenbach, R. P., & Sander, M.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2012-04-13
- Volume
- 46
- Issue
- 9
- Pages
- 4916-4925
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2334827312
- Cited by
- 634
- References
- 5
- FWCI
- 38.99
- Type
- journal article
- Language
- en
- Open access
- closed
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review
Data sources
Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
