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Qualitative 13 C-NMR experiments were performed at 298 K and for different loadings to investigate the liquid speciation in amino acid neutralized by both strong inorganic and weak organic bases. The two different systems, potassiumsarcosinate(KSAR) and sarcosine blended with equinormal quantities of 3-(methylamino)propylamine (MAPA-SAR) were studied. In presence of CO 2 , the spectra...