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Albena Merdzhanova, Diana A. Dobreva and Stanislava Georgieva
of eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA) and docosapentaenoic acid (DPA). EFSA J. 10, 2815-2863.
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Albena Merdzhanova, Mona Stancheva, Diana A. Dobreva and Lyubomir Makedonski
. Dobreva, L. Makedonski, Ovidius University Annals of Chemistry, 21, 1, 23-28 (2010)
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Alina Soceanu, Viorica Popescu and Simona Dobrinas
Milk consumption is important in the diet of all age groups because it provides important nutrients that are essential for humans. Children are the largest consumers of milk, thus, it’s very important that milk is free of toxic compounds that can be harmful for humans. Aim of the study was to determine the physico-chemical characteristics of some samples of milk powder for different stage of baby growing and for some samples of fresh milk: raw cow’s milk, milk trade and UHT type. The following physico-chemical properties: density, pH, acidity, the presence of acetone, enzymes, antiseptics, dry substance, the ash, total fat, saponification and peroxide index, total nitrogen and protein content were determined. Comparing the values of acidity for analyzed samples it can be concluded that the powder milk acidity value is much lower than the fresh milk. The presence of antiseptics and acetone was not identified, and amylase and peroxidase were found only in raw cow's milk. The highest protein content was found for milk powder (27.22%).
Albena Merdzhanova, Diana A. Dobreva and Veselina Panayotova
African catfish (Clarias gariepinus) is new species for the Bulgarian market. It is a valuable source of biologically active components that play an important role in human diet, but there is lack of information for the quality of its dietary lipids. This study focuses on the assessment of skin and edible tissue lipid quality of farmed African catfish based on lipid content and detailed fatty acids, fat-soluble vitamins, cholesterol and carotenoids composition. Fatty acid composition was determined by gas chromatography with mass spectrometer (GC/MS) after lipid extraction. Vitamins A, D3 and E, beta-carotene, astaxanthin and cholesterol were analyzed simultaneously using high performance liquid chromatography (HPLC) with ultraviolet and fluorescence detectors. Lipids, cholesterol, astaxanthin and monounsaturated fatty acids (MUFA) were significantly higher in skin, whereas vitamin A and E, polyunsaturated fatty acids (PUFA) were higher in muscle tissue. Vitamin D3 showed comparable amounts in both tissues. Eicosapentaenoic acid (C20:5n3) and docosahexaenoic acid (C22:6n3) which are important indicators for fish lipids quality presented significantly high amounts. A portion of 100 g filet without skin contains approximately 600 mg. Results confirmed that African catfish meat - with or without the skin, can be valuable and preferable source of biologically active lipids.
Lubomir Makedonski, Katya Peycheva and Mona Stancheva
Major part of healthy human diet consist of marine fish and seafood products. And it is not surprising that there are numerous studies based on metal accumulation in various fish species. Fish may also be used for heavy metal monitoring programs of marine environments due to their easy sampling, sample preparation and chemical analysis. Concentrations of lead, cadmium, nickel, copper, manganese, zinc, iron, chromium, total mercury and total arsenic were determined in edible part of two commercially valuable fish Greek aquaculture species European sea bass (Dicentrarchus labrax) and gilthead sea bream (Sparus aurata) purchased from Bulgarian market during 2011. The concentration of metals was measured by atomic absorption spectrophotometry (AAS). The concentration of the heavy metals in examined fish species ranged as follow: Pb 0.008 - 0.013; Cd 0.0017 - 0.022; Ni 0.007 - 0.012; Cu 0.054 - 0.115; Mn 0.043 - 0.09; Zn 0.14 - 0.15; Fe 0.17 - 0.19; Cr 0.05 - 0.07; Hg 0.11 - 0.13; As 1.6 - 1.8 mg kg-1 wet weight, respectively.
The concentration of the heavy metals obtained from this study is compared with the results of a Black Sea bluefish (Pomatomus saltatrix) caught during the same year. The concentration of metals was significantly affected by the sampling site and fish species. Difference in the heavy metal concentration between European sea bass, gilthead sea bream is observed for Cu, Mn, Zn and Fe. Although, the heavy metals in the edible parts of the investigated fish were in the permissible safety levels for human uses.
Daniela Borošová, Katarína Slotová and Eleonóra Fabiánová
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Esteban M, Castano A et al. (2014): Mercury analysis in hair: Comparability and quality assessment within the transnational COPHES
Albena Merdzhanova, Veselina Panayotova, Diana A. Dobreva, Rostitsa Stancheva and Katya Peycheva
(mollusca) with economic importance in Black Sea, Izvestiya na sayuza na uchenite - Varna, Seriya “Morski nauki”, ISSN 1310-5833 (2010) 78-83. - in Bulgarian
. M. Leontowicz, H. Leontowicz, J. Namiesnik, R. Apak, D. Barasch, A. Nemirovski, S. Moncheva, I. Goshev, S. Trakhtenberg and S. Gorinstein, Rapana venosa consumption improves the lipid profiles and antioxidant capacities in serum of rats fed an atherogenic diet, Nutrition Research 35 (2015) 592-602.
. A. Merdzhanova, D.A. Dobreva and L. Makedonski, Fat soluble vitamins and fatty
Albena Merdzhanova, Mona Stancheva and Lubomir Makedonski
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. V. Shlyakhov and