Study of the products of alkaline decomposition of hydrolysis lignin by high resolution mass spectrometry with atmospheric pressure photoionization
T14N1
D.S. Kosyakov, E.V. Ipatova, S.M. Krutov, N.V. Ul’yanovskii, I.I. Pikovskoi
A method of high resolution mass spectrometry with acetone doped atmospheric pressure photoionization was used to study the products of alkaline solvolysis of hydrolysis lignin. It was found that the mass spectrum of hydrolysis lignin depolymerization products comprises about seven thousand peaks of oligomers containing up to 10 aromatic units with an average molecular weight of 150 Da. The calculation of the elemental compositions of all detectable oligomers and their visualization in van Krevelen coordinates allowed us to show that the studied sample is different from the native (virgin released) lignin due to the presence of fractions with a high oxygen content and highly unsaturated condensed structures, including polyaromatic hydrocarbons. To characterize the structural units of lignin oligomers an approach based on the collision induced dissociation of precursor ions in a broad m/z range was used.
