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Disinfection properties of the tea polyphenol epigallocatechin gallate in the presence of calcium ions
- Source :
- Aqua, Vol 70, Iss 5, Pp 731-740 (2021)
- Publication Year :
- 2021
- Publisher :
- IWA Publishing, 2021.
-
Abstract
- 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. HIGHLIGHTS Low concentration calcium ions inhibit the disinfection effect of EGCG, but high concentrations enhance disinfection.; Rate of EGCG-induced E. coli damage rises, as calcium ion concentration increases.; Calcium ions inhibit EGCG-induced damage to cell walls and membranes but promote internal structural damage.; Tea polyphenols may be useful for processing raw water with high calcium ion concentrations.
- Subjects :
- 0301 basic medicine
concentration
030103 biophysics
Environmental Engineering
Health, Toxicology and Mutagenesis
chemistry.chemical_element
Epigallocatechin gallate
Calcium
Environmental technology. Sanitary engineering
complex mixtures
egcg
Ion
03 medical and health sciences
chemistry.chemical_compound
GE1-350
disinfection
TD1-1066
Water Science and Technology
calcium ions
Chemistry
food and beverages
bacteriostasis
tea polyphenols
Environmental sciences
030104 developmental biology
Polyphenol
sense organs
Nuclear chemistry
Subjects
Details
- ISSN :
- 16053974 and 00037214
- Database :
- OpenAIRE
- Journal :
- Journal of Water Supply: Research and Technology-Aqua
- Accession number :
- edsair.doi.dedup.....02a31c6d9065495575e3d6e2bf64c882