An Interaction of Rhamnolipids with Cu2+ Ions

Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry
Jolanta CieślaAndrzej Bieganowski

Abstract

This study was focused on the description of interaction between Cu2+ ions and the 1:1 mono- and dirhamnolipid mixtures in the premicellar and aggregated state in water and 20 mM KCl solution at pH 5.5 and 6.0. The critical micelle concentration of biosurfactants was determined conductometrically and by the pH measurements. Hydrodynamic diameter and electrophoretic mobility were determined in micellar solutions using dynamic light scattering and laser Doppler electrophoresis, respectively. The copper immobilization by rhamnolipids, methylglycinediacetic acid (MGDA), and ethylenediaminetetraacetic acid (EDTA) was estimated potentiometrically for the Cu2+ to chelating agent molar ratio from 16:100 to 200:100. The degree of ion binding and the complex stability constant were calculated at a 1:1 metal to chelant molar ratio. The aggregates of rhamnolipids (diameter of 43-89 nm) were negatively charged. Biosurfactants revealed the best chelating activities in premicellar solutions. For all chelants studied the degree of metal binding decreased with the increasing concentration of the systems. The presence of K⁺ lowered Cu2+ binding by rhamnolipids, but did not modify the complex stability significantly. Immobilization of Cu2+ by bio...Continue Reading

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Citations

Mar 1, 2019·International Journal of Molecular Sciences·Noadya MonnierCatherine Sarazin
Dec 3, 2020·Environmental Monitoring and Assessment·Rodolfo RibasFatima Menezes Bento
Apr 4, 2021·Current Microbiology·Yaima Barrios San MartínMaria I Sánchez López

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Methods Mentioned

BETA
isothermal titration calorimetry
dynamic light scattering

Software Mentioned

MGDA

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