Preserved lignin structures in Miocene-aged lignite lithotypes, Bulgaria.

Maya Stefanova (1) , O. Maman (1) , Bernard Guillet (1) , Jean-Robert Disnar (1)

1 ISTO - Institut des Sciences de la Terre d'Orléans

Contents of preserved lignin structures in Miocene-aged lignite lithotypes were determined. Phenol aldehydes, ketones and acids released from lignin by CuO oxidative hydrolysis were separated by capillary zone electrophoresis (CZE). Products of degradation were separated and identified by GC–MS to confirm CZE data and to complement composition data. The following values for the contents of preserved lignin structures in lignite lithotypes were determined (in wt%): xylain, 8.5; humovitrain, 6.7; liptain, 6.4; and humoclarain, 3.3. Some fatty acids, negligible contents of benzene polycarboxylic acids and their hydroxy/methoxy counterparts were also observed using GC–MS.

Keywords: Coal; Lignin; Capillary electrophoresis

Domains: Geochemistry

Maya Stefanova, O. Maman, Bernard Guillet, Jean-Robert Disnar. Preserved lignin structures in Miocene-aged lignite lithotypes, Bulgaria.. Fuel, 2004, 83, pp.123-128. ⟨10.1016/S0016-2361(03)00037-1⟩. ⟨hal-00069184⟩