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Enzymatically Hydrolyzable Amino Acids In North Sea Sediments And Their Possible Implication For Sediment Nutritional Values, B. Dauwe, J. J. Middelburg, P. Van Rijswijk, J. Sinke, P. M. J. Herman, C. H. R. Heip
Enzymatically Hydrolyzable Amino Acids In North Sea Sediments And Their Possible Implication For Sediment Nutritional Values, B. Dauwe, J. J. Middelburg, P. Van Rijswijk, J. Sinke, P. M. J. Herman, C. H. R. Heip
Journal of Marine Research
The nutritional value of peptidic material in five North Sea sediments that differ in organic matter quality has been investigated with an enzymatic approach measuring the digestibility (rate constant k of proteolysis by protease) and the proportion of bioavailable fraction of amino acids (%EHAA-i:THAA). The bioavailable fraction in sediments varied between 14-50% EHAA-i:THAA and was generally lower than in potential source organisms such as algae (40-43%), plankton (~80%) and bacteria (57-72%). The rate of proteolysis of the amino acids varied among stations (k = 0.3-3.1 h-1) with a systematic decrease when going from labile to more refractory …