Weak interaction-alleviated toxicity of aromatic compounds in EPS matrices : Quantifying the noncovalent bonding-to-EPS ecoservice chain

Copyright © 2021 Elsevier B.V. All rights reserved..

Extracellular polymeric substances (EPSs) constitute a largely global carbon pool that could participate in geochemical process of organic chemicals. Besides the chemical hydrolysis and redox of chemicals exerted by the EPS, weakly noncovalent interactions with dispersive EPS control the toxicity of numerous organic compounds. Nevertheless, there has been a lack of in-depth research on this issue. This work quantified a chain of links from bonding to detoxification using natural biofilms to explore the control behavior of fragile noncovalent bonding to the ecotoxicity of aromatic compounds. Such bonding decreases cell absorbability of m-phenylenediamine, 2-naphthol, and phenanthrene by 5.3-53.6%, resultantly increasing the indices of microbial diversity by 122.2-279.5%. Herein, the 60 kDa chaperonin in EPS acts as the most important contributor (16.4% of the top 20 proteins) to noncovalent interactions. Hydrophilic carboxyl groups in EPS bind with hydroxyl and amino groups of m-phenylenediamine and 2-naphthol via H-bonds, respectively. Methylene and carboxyl groups combine with hydrophobic phenanthrene via CH···π and H-bonding, respectively. A quantified chain was consequently established that weak interaction linearly controls ecotoxicity of aromatic compounds via the above suppressive cell absorbability of aromatic compounds (R2 =0.82). Considering ubiquitous EPS and prevailing aromatic compounds, our findings revealed a previously unnoticed phenomenon in which seemingly fragile noncovalent bonding profoundly alleviates the ecotoxicity of aromatic compounds in Earth's surface system.

Medienart:

E-Artikel

Erscheinungsjahr:

2021

Erschienen:

2021

Enthalten in:

Zur Gesamtaufnahme - volume:416

Enthalten in:

Journal of hazardous materials - 416(2021) vom: 15. Aug., Seite 125824

Sprache:

Englisch

Beteiligte Personen:

Chen, Kai [VerfasserIn]
Wang, Qian [VerfasserIn]
Fu, Yaojia [VerfasserIn]
Yu, Xiaoxiao [VerfasserIn]
Liu, Peilin [VerfasserIn]
Kang, Fuxing [VerfasserIn]

Links:

Volltext

Themen:

7440-44-0
Aromatic compound
Carbon
Ecotoxicity
Extracellular polymeric substance
Journal Article
Noncovalent bonding
Organic Chemicals
Research Support, Non-U.S. Gov't

Anmerkungen:

Date Completed 16.09.2021

Date Revised 16.09.2021

published: Print-Electronic

Citation Status MEDLINE

doi:

10.1016/j.jhazmat.2021.125824

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM330351141