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Functional properties of protein isolate and acid soluble protein-rich ingredient co-produced from ethanol-treated industrial rapeseed meal

100%
Kalaydzhiev H., Ivanova P., Silva C. L. M., Chalova V. I.
Polish Journal of Food and Nutrition Sciences
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2019
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tom 69
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nr 2
Rapeseed meal is produced in large quantities as a by-product of vegetable oil production. To enhance the utility and profitability of the rapeseed meal, it was treated with ethanol and used for concomitant preparation of two protein-rich ingredients, namely protein isolate (PI) and acid soluble protein (ASP). Their functional properties were evaluated in response to two boundary concentrations of NaCl (0.03 and 0.25 mol/L) in a wide pH range (2 to 10). The PI exhibited the lowest protein solubility at isolectric point (pH 4.5) which increased both at lower and higher pH. In contrast, ASP exhibited high protein solubility (>70%) which was negligibly influenced by pH. The addition of 0.03 mol/L NaCl increased its protein solubility to almost 100% at acidic pH. The water holding capacity of PI was positively influenced by the additionf 0.25 mol/L NaCl. The ASP did not exhibit any capacity to hold water but demonstrated higher ability to absorb oil compared to the PI. Both ingredients exhibited different thermal stability in response to salt addition at pH 7 and 8. PI and ASP exhibited completely different pattern of emulsion stability as influenced by pH. While the stability of PI emulsions was close to 100% and only negligibly affected by pH, the ASP emulsion stability significantly varied in response to pH variation. The concomitant production of PI and ASP resulted in products with distinctive techno-functional properties, which makes them suitable for different applications as additives in the formulation of new food products.
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New data for invasive pilengas mullet species Liza haematocheila (Temminck & Schlegel, 1845) along Bulgarian Black Sea coast

100%
Ivanova P., Nikolov V., Dzhembekova N.
Annals of Warsaw University of Life Sciences - SGGW. Animal Science
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2017
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tom 56[2]
New data for invasive pilengas mullet species Liza haematocheila, (Temminck and Schlegel, 1845) along Bulgarian Black Sea coast.Liza haematocheila(Temminck & Schlegel) (syn. Mugil soiuyBasilewsky)is an invasive mugilid species, native to the Amu Darya River basin. After numerous introduction attempts to support commercial fisheries, this species established a successful breeding population in the Sea of Azov during the early 1980s. This invasive species expanded its areal of distribution and has been recorded for north-eastern Black Sea, Turkish coast, Aegean Sea and Western Meditteranean. The present study covered new data for morphometrical and meristic characteristics of the speciemens caught along Bulgarian Black Sea coast as well as genetic-biochemical evidence for species identification.
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Biochemical-genetic comparison of Cobitis simplicispina from Turkey, and C.taenia, C.albicoloris and C.elongata from Bulgarian freshwaters

100%
Ivanova P., Erk'akan F., Ozeren S. C., Dobrovolov I.
Folia Biologica
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2003
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tom 51
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nr Suppl.
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