Abstract
Dissolved and particulate fractions extracted from a lake diatom ooze were examined for individual amino acids. The study focused on combined amino acids, the predominant form in the interstitial dissolved pool (> 90%). An abundance of glycine and β-alanine was observed in porewater samples of sediments both squeezed manually and gathered with in-situ dialysis (“peeper”). Sedimentpress squeezing and leaching of the sediment by water gave higher total quantities and different compositions (with more aliphatic and aromatic protein amino acids, α-alanine being predominant). These two methods modify the original composition, presumably due to the formation of Fe-oxides and dissolution of sediment organic fractions, the alteration being aggravated if squeezing is delayed.
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