Amino acid composition of sediments from a deltaic environment |
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| Authors: | JM Gonzalez J Grimalt J Albaigés |
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| Institution: | Laboratorios Menarini, Alfonso XIII, Badalona Spain;Environmental Chemistry Unit, Institute of Bio-Organic Chemistry, J. Girona Salgado, Barcelona-34 Spain |
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| Abstract: | Nineteen amino acids in sediments from the Ebro Delta (Spain) have been determined by HPLC. According to quantitative and qualitative data it is suggested that the distributions reflect organic autochthonous contributions and are constrained by environmental conditions of deposition.In the more reducing areas (8.7–11.6 mg total amino acids/g of dry sediment) hydroxyproline, threonine, glycine and glutamic acid are the major amino acids, while in the off-shore stations (1.0–2.7 mg total amino acids/g of dry sediment) ornithine, lysine, phenylalanine, serine and valine are dominant. In these samples absolute concentrations decrease with water depth.The analysis of two cores has shown that sulfur-containing and neutral branched-chain amino acids are the least resistant to geochemical degradation. Within the basic fraction, which appeared to be the most stable, ornithine is produced geochemically and preferentially in the more oxic sediments. |
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| Keywords: | From whom reprints should be requested |
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