Journal
AQUA-WATER INFRASTRUCTURE ECOSYSTEMS AND SOCIETY
Volume 70, Issue 5, Pages 731-740Publisher
IWA PUBLISHING
DOI: 10.2166/aqua.2021.016
Keywords
bacteriostasis; calcium ions; concentration; disinfection; EGCG; tea polyphenols
Categories
Funding
- National Natural Science Foundation of China [51678026]
- Beijing University of Civil Engineering Postgraduate Innovation Project [PG2020044]
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Research has shown that the presence of low concentration Ca2+ inhibits the disinfection effect of EGCG, while higher concentrations enhance its effects. As Ca2+ concentration increases, the proportion of damaged bacteria also increases.
The antibacterial properties of tea polyphenols make them suitable for drinking water disinfection, but it is necessary to clarify the influence of metal ions on the sterilization efficacy. Epigallocatechin gallate (EGCG) was selected as a representative tea polyphenol, and the effects of calcium ion (Ca2+) concentration on its disinfection properties in Escherichia coli cultures were investigated. Changes in bacterial growth and structures were detected. The presence of low concentration Ca2+ (1-5 mM) inhibited the disinfection effect of EGCG but higher concentrations (6-10 mM) enhanced its effects. As Ca2+ concentration increased, the proportion of damaged bacteria also increased (15-43%). The presence of Ca2+ lessened the damaging effects of EGCG on the surface structures of E. coli but may have facilitated the entry of EGCG into the bacteria, enhancing its antibacterial efficacy. Tea polyphenols may be useful additives for the disinfection of groundwater and other raw waters containing calcium ions.
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