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2D 23Na 3Q/MAS NMR spectra of mono- (Na+) and multivalent ions alginate gels. Reprinted with permission from [216] (Available online: https://pubs.acs.org/doi/full/10.1021/acs.biomac.7b00627. Accessed on 14 November 2022. Further permission related to the material excerpted should be directed to the ACS).
