Assuntos
Espectroscopia de Ressonância Magnética/métodos , Magnoliopsida/química , Ácido Oleanólico/análogos & derivados , Saponinas/análise , Estrutura Molecular , Ácido Oleanólico/análise , Raízes de Plantas/química , Espectrometria de Massas por Ionização por Electrospray , Espectrofotometria UltravioletaRESUMO
A nuclear magnetic resonance (NMR) methodology was assessed regarding the identification and quantification of additives in three types of polylactide (PLA) intended as food contact materials. Additives were identified using the LNE/NMR database which clusters NMR datasets on more than 130 substances authorized by European Regulation No. 10/2011. Of the 12 additives spiked in the three types of PLA pellets, 10 were rapidly identified by the database and correlated with spectral comparison. The levels of the 12 additives were estimated using quantitative NMR combined with graphical computation. A comparison with chromatographic methods tended to prove the sensitivity of NMR by demonstrating an analytical difference of less than 15%. Our results therefore demonstrated the efficiency of the proposed NMR methodology for rapid assessment of the composition of PLA.
