Z. Lalic’s research while affiliated with Faculty of Music in Belgrade and other places

Results of the analysis of lipids, proteins and amino acids as well as calculation of nutritive value parameters in samples of two sea shellfish (Venus verucosa and Mytilus galloprovincialis), a marine snail (Monodonta turbinata) and two terrestrial snails (Helix pomatia and Helix nemoralis) are presented. Lipid analysis revealed a high relative content of cholesterol among the other identified and unidentified sterols. Of significant nutritional importance is a high content of polyunsaturated fatty acids with more than 20 C atoms. Hydrolysed proteins contain all essential amino acids. Calculated from amino acids, pure proteins represent more than 36% and 54% of dry matter of shellfish and snails, respectively. In the case of snails a large difference between crude proteins (determined by Kjeldahl's method) and pure proteins (calculated from amino acid content) indicates the presence of other nitrogen-containing material in considerable quantities. Nutritive values indicate high biological value of proteins in shellfish, very similar to the biological values of other meat sources. Biological value of the snail's protein is lower and similar to soya protein.