Organic Matter Preservation In Marine Environments: Insights From A Study Of Marine Dissolved Organic Matter (DOM) Composition, Age And Source. R. de Jesus and L. I. Aluwihare Associated lipids and two sugar fractions released by acid hydrolysis of a DOM fraction are of marine origin in the estuary. However, the glucose-rich carbohydrate fraction (potentially derived from cellulose) appears to be primarily of terrestrial/river origin even in the estuary. This is the first demonstration that glucose in marine environments may be derived from an allocthonous source. Solid Phase Extract Fraction B d13C = -23.3 D14C = -45.4 1H NMR Spectra and Carbon Isotope Signatures of a Subset of Dissolved Organic Matter (DOM) Isolated From the Delaware Estuary By Solid Phase Extraction Solvent peak Trifluoroacetic acid hydrolysis Hydrolysed Lipid d13C = -24.8 D14C = -97.5 Marine aqueous Ethyl acetate Hydrolysed Polar HPLC separation S1 Glucose + Unknown d13C = -23.3 D14C = -36.4 Terrestrial? S2 Xylose+Rhamose+Galactose d13C = -21.3 D14C = 48.1 Marine S3 Fucose+Mannose+Arabinose d13C = -20.4 D14C = 21 Marine