The objective of the study was to evaluate the technological value of double-improved Polish varieties of rape, i.e. two winter varieties: pollinated variety Kana and hybrid variety Pomorzanin, and one spring variety pollinated Bios. The technological values of seeds and the quality of oils were evaluated by determining their traits which are important in processing and nutrition, i.e.: 1000 seeds mass, geometric features of seeds, contents of oil, phosphorus, phenolic compounds and glucosinolates in seeds, pressing yield, lipid composition, degree of hydrolysis and oxidation of oil as well as contents of total phosphorus and non-hydratable phosphorus. Analyses demonstrated that seeds of the winter variety (Kana, Pomorzanin) were characterized by a higher technological value than those of the spring variety (Bios) due to a higher mass of 1000 seeds and oil content and a lower concentration of phosphorus compounds, including non-hydratable phospholipids. The highest nutritive value was demonstrated for oil processed from seeds of the winter hybrid variety Pomorzanin as it was characterized by the most optimal ratios of n-6 and n-3 acids. The least valuable raw material for the production of edible oil turned out to be seeds of the spring pollinated variety Bios which characterized by the lowest content of oil and, simultaneously, the highest content of non-hydratable phospholipids and unfavorable to health ratio of monounsaturated fatty acids.
Cruciferin was separated from the rapeseed crude proteins using salting out with ammonium sulphate and Sephadex G-200 gel filtration. Then, so obtained protein fraction was separated using a micellar electrokinetic chromatography (MEKC) with SDS as a the surfactant. Nine peaks with migration times between 14.33 and 20.48 min were recorded on the chromatogram. The main cruciferin subfractions were characterised with molecular mass of 22 000 and 33 000 determined using MEKC technique. UV spectra showed that cruciferin protein appears as a complex with phenolic acids.
The aim of the study was to determine the effect of linseed and rapeseed dietary supplementation on the fatty acids profiles of two ostrich fat depots: breast and subcutaneous (above the leg). The study was carried out on 40 ostriches raised in five groups – control (C) or with 4% (L4) or 8% (L8) linseed, or 5% (R5) or 10% (R10) rapeseed in the diet, from hatching to 12 months of age. Fat samples of breast (BF) and leg fat (LF) were taken for fatty acids analysis. Generally ostrich fat has high contents of PUFA (BF – 23.9, LF – 20.2 g/100 g FAME), especially linoleic acid (BF – 16.4, LF – 12.5 g/100 g FAME) and linolenic acid (BF – 5.7 and LF – 6.2 g/100 g FAME). Ostrich BF had a higher content of n-6 FA and total PUFA and lower n-3 FA than the LF. Both fat depots had desired PUFA/SFA ratios above 0.4, but not desirable n-6/n-3 ratios. BF had significantly higher (0.69)PUFA/SFA ratio than LF (0.55). Both L4 and L8 caused higher total PUFA content (27.8, 25.6 g/100 g FAME, respectively) and higher PUFA/SFA ratios (0.74, 0.75, respectively) and lower n-6/n-3 ratios (1.5, 1.8, respectively) compared to C. The rapeseed supplementation decreased the LA content in ostrich fats (R5- 14.1, R10-13.4g/100g FAME), causing a lower n-6/n-3 (4.1, 4.6, respectively) ratio compared to C (6.1). The supplementation of ostrich diets with linseed improved the nutritional value of ostrich fat by increasing the n-3 FA, total PUFA content and PUFA/SFA ratio. Although the leg fat had a lower PUFA content, both depots of ostrich fats can be recommended as valuable ingredients for value-added meat products fit for human consumption.
W prezentowanych badaniach materiałem badawczym były nasiona rzepaku poddane procesowi obłuskiwania, a celem było określenie parametrów pracy separatora sitowo-pneumatycznego, z założeniem uzyskania największej skuteczności. Podczas badań zmieniana była wielkość otwarcia przesłony w cyklonie, która reguluje prędkość przepływu powietrza oraz zastosowano trzy rodzaje sit prostokątnych, tj.: sito 2,5 x 25 mm, 5 x 25 mm i 1,3 x 20 mm oraz sito z otworami okrągłymi o średnicy 2,5 mm w celu doboru najefektywniejszej separacji. Analizując wyniki strat liścieni oraz skuteczności oddzielenia okrywy owocowo-nasiennej najefektowniejsze okazało się zastosowanie sita prostokątnego o wymiarach 1,3 x 20 mm jako górne oraz 2,5 x 25 mm jako dolne oraz ustawiając prędkość przepływu powietrza 7,5 m·s-1.
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