According to the composition of EPS no metal was found to be attached with the structure of purified EPS. Likewise, in this study the monomeric composition was analysed to demonstrate the structure of purified EPS, where no metal was found to be attached with the chemical structure of it. This is also mentioned and referred in the revised version of the manuscript.
According to the 1H NMR spectrum, it can be assumed that EPS has a complex branched structure.