5 results
Fatty acid composition in the wild boars muscles from different regions of Poland
- Renata Pietrzak-Fiecko, Monika Modzelewska-Kapitula
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- Journal:
- Proceedings of the Nutrition Society / Volume 79 / Issue OCE2 / 2020
- Published online by Cambridge University Press:
- 10 June 2020, E688
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Meat and meat products are one of the most relevant food groups in the human diet due to high content of protein. Meat from wild animals is considered a delicacy and commands a high price compared to other sorts of meat. Due to the characteristic sensory properties (taste), lower fat and cholesterol contents and higher share of polyunsaturated fatty acids (PUFA) a growing interest of this meat is noted(1,2).
The aim of the study was to compare fatty acid profile in wild boars muscles depending on the feeding grounds.
The research material consisted of 37 samples of wild boars (Sus scrofa) muscles from three different regions in Poland: Warmia and Mazury, Podlasie and Silesia. The fat was extracted from the muscle samples by the Folch method. The fatty acid (FA) composition was determined after the acids were trans-methylated according to the Peisker method. Chromatographic separation was performed using an Agilent Technologies 7890A gas chromatograph with a flame-ionization detector (FID).
The average share of sum of saturated fatty acids (ΣSFA) in wild boars fat from Warmia and Mazury, Podlasie and Silesia regions were 41.5%, 39.6% and 38.8%, respectively. In wild boars fat from Silesia the highest share of sum of monounsaturated fatty acids (ΣMUFA) was found (46.9%), while in wild boars fat from Warmia and Mazury, Podlasie it accounted for: 44.4% and 39.9%, respectively. A similar share of ΣPUFA (approx. 14%) was determined in wild boars fat from Warmia and Mazury, and Silesia region, whereas in those from Podlasie region ΣPUFA accounted for approx. 12%.
Meat fat from wild boars is a valuable source of fatty acids with a beneficial impact on human health. However, the fatty acids profile depends of the region, which indicated the predominant influence of the animal's feed on FA composition of meat fat.
Influence of carbohydrate additives on 5-hydroxymethylfurfural (HMF) content in pork tenderloin
- Julia Bogdanowicz, Wacław Mozolewski, Monika Modzelewska-Kapituła, Katarzyna Tkacz, Adam Wie˛k
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- Journal:
- Proceedings of the Nutrition Society / Volume 79 / Issue OCE2 / 2020
- Published online by Cambridge University Press:
- 10 June 2020, E323
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Heat-processed foodstuffs are a rich source of Maillard reaction products (MRPs) in the daily human diet. Although MRPs favourably affect the colour and flavour of heat-processed foods, they also have an impact on nutritional value and safety. Some MRPs (e.g. 5-hydroxymethylfurfural) may be toxic, mutagenic or carcinogenic and their presence in food has been studied extensively due to possible negative health effects(1,2). There is a general scarcity of published information on 5-hydroxymethylfurfural (HMF) concentrations in meat products.
This study analysed whether there are differences in the concentrations of HMF between smoked pork tenderloins previously cured with the addition of glucose, saccharose or maltodextrin at concentrations of 0.5, 1.0 or 1.5% (including the control trial without sugar). Material for the tenderloin production consisted of longissimus dorsi muscles collected from 20 porcine carcasses. Colour parameters of the external surface (CIE L*a*b* system) and the content of water and 5-hydroxymethylfurfural were determined. The HMF content was analysed with reversed-phase high-performance liquid chromatography (RP-HPLC).
The type of sugar used for curing had a significant impact on the amount of HMF formed in the product. The highest HMF content was found in the tenderloins cured with saccharose (it was about three-fold higher than the control trial and trials with glucose or maltodextrin). The formation of HMF was influenced not only by the type but also by the concentration of carbohydrates. Higher concentrations of glucose and maltodextrin resulted in a slight increase in the HMF content in the product (P > 0.05), while a higher concentration of saccharose produced a very pronounced HMF content increase (P < 0.05). Furthermore, tenderloins cured with a 2% carbohydrate addition were characterized by a lower water content (P < 0.01) and a darker surface colour (P < 0.01) compared to tenderloins with a lower carbohydrate addition. The results indicate the clear impact of technological additives on the HMF content of tenderloins. Conducting studies on the HMF in meat products is fully justified due to the relatively high HMF contents observed in the experiment (approximately 20–23 mg/kg), which were comparable to products such as bread or fruit jams.
Quality changes in oil marinades used for flavoring of meat
- Adam Wie˛k, Monika Modzelewska-Kapituła, Katarzyna Tkacz, Renata Pietrzak-Fiećko, Janusz Pomianowski
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- Journal:
- Proceedings of the Nutrition Society / Volume 79 / Issue OCE2 / 2020
- Published online by Cambridge University Press:
- 10 June 2020, E719
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Meat semi-finished products that are portioned or not, meat with the addition of a different composition of spices and oil are a common element of the commercial offer in the convenient ready to cook food segment. During the refrigeration storage in this complex system of meat, oil and spices, there is a number of physicochemical changes, including hydrolytic and oxidative changes of the oil(1). The products of these reactions become integral components of the meat subjected to heat treatment. As a result of heating, secondary oxidation products of lipids may be formed which constitute a serious health risk(2). The study was aimed at determination of the effect of spices containing antioxidants and sulfur-organic compounds on hydrolytic and oxidative changes in the oil that formed the base of the marinade in which meat was kept. Pork neck was minced and formed into burgers (250 g), rapeseed oil (120 g) and spices (5 g) were used. Four research groups were analyzed meat / oil / spices system with rosemary, oregano, garlic or onion. Oil samples were collected on the third, fifth and eighth day of refrigerated storage. The control sample was the oil from the meat / oil system only. The quality of the oil was evaluated on the basis of the acid value, peroxide value and TBARS index. In the oil with onion, garlic, rosemary and oregano the hydrolytic changes on the 8th day of storage were significantly lower compared to the control. On the basis of the average peroxide value in oil marinades with the addition of rosemary and oregano, significantly lower values of this indicator were found when using rosemary (3.61 meq O2/kg) in comparison with oregano (6.01 meq O2/kg). The average of TBARS index in marinade with onions and garlic was lower by 31% and 48%, respectively. Also the use of rosemary and oregano was effective in blocking the formation of secondary oxidation products (rosemary even three times higher than that of oregano).
Nutritional value of cooked and sous-vide beef: mineral compounds content
- Monika Modzelewska-Kapituła, Renata Pietrzak-Fiećko, Katarzyna Tkacz, Adam Więk, Julia Bogdanowicz
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- Journal:
- Proceedings of the Nutrition Society / Volume 79 / Issue OCE2 / 2020
- Published online by Cambridge University Press:
- 10 June 2020, E433
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Meat, including beef, is a rich source of minerals in the human diet(1,2). However, different thermal treatments might affect minerals concentration in beef and thus its nutritional value. The aim of the study was to determine the degree of coverage of the demand for minerals by consuming 100 g of steam-cooked and sous-vide beef. Material for the study were semimembranosus muscles (n = 12), cut into 2.5 cm thick steaks, which were subjected to steam cooking to obtain 75°C in geometric centre and sous-vide treatment at 60°C for 4 h. The content of minerals was analyzed by flame atomic absorption spectrometry method (flame:acetylene-air). Percentages of the recommended daily allowance (RDA) of Ca, Cu, Fe, Mg, Zn and the adequate intake (AI) of Mn, K, Na in 100 g of thermal processed beef were determined for adults (males and females, aged 19–50 years) and for children (aged 4–8 years) based on the Institute of Medicine, National Academies, recommendations. The concentration of Ca, Fe, Zn, and Cu was higher in steam-cooked beef, whereas Na and K in sous-vide beef. Thermal processes beef was very good source of Zn and Fe; 100 g of steam-cooked beef satisfied 119% of Zn RDA for children, 54% for males and 74% for females, whereas sous-vide beef 101%, 46% and 63%, respectively. A portion of steam-cooked beef provided 32% of Fe RDA for children, 40% for males and 18% for females, whereas sous-vide beef 21%, 26% and 11%, respectively. The steam-cooked meat was also relatively good source of Cu and provided from 12% RDA (males and females) to 25% (children), whereas sous-vide beef from 10% to 20%, respectively. Thermal processed beef was moderate source for Mg (from 4 to 13% of RDA) and K (from 7 to 9% of AI) and poor source of Ca (up to 0.5% of RDA), Mn (up to 0.3% of AI) and Na (up to 3% of AI). Daily requirements for minerals were satisfied to higher degree by a 100 g portion of steam-cooked beef, which was caused by lower cooking loss than sous-vide samples.
The influence of marinade composition on pork tenderness
- Katarzyna Tkacz, Monika Modzelewska-Kapituła, Adam Wie˛k
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- Journal:
- Proceedings of the Nutrition Society / Volume 79 / Issue OCE2 / 2020
- Published online by Cambridge University Press:
- 10 June 2020, E576
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The aim of the study was to identify the effect of marinating meat on selected quality determinants. Fifty-four pork samples were prepared from longissimus dorsi muscles, each 2.5-cm-thick; they were subsequently marinated for 24 hours (n = 12) and control samples were also prepared (n = 6). The following marinades were used: base marinade (M) whose ingredients included a mixture of herbs and condiments (salt, pepper, juniper berries, rosemary, bay, pimento, garlic) and 3 liquid marinades obtained by adding to the base marinade of apple cider vinegar (MV), light beer (MB) and buttermilk (MM). In the samples pH, marinade absorption, drip loss, cooking loss, WBSF and tenderness by sensory assessment were measured(1,2).
The pH value of the material used for the study was 5.8 ± 0.02. The use of the base marinade increased the pH to 6.37 ± 0.03, whereas the liquids used in the marinades decreased the pH to 5.5 ± 0.05. Marination resulted in an increase in the material weight by 2.87 ± 0.05% (MB), 4.45 ± 0.07% (MM), 0.87 ± 0.03% (M). The addition of vinegar resulted in exuding meat juice and a decrease in the material weight by 2.53 ± 0.06% (MV). Using the base marinade reduced drip loss (0.53 ± 0.01%) compared with the control (1.37 ± 0.03%). Sour marinade (MV) increased cooking loss by 18% compared to the control, the MB and MM marinades did not affect this parameter significantly, and the base marinade had a significant effect on reducing cooking loss by 24%. Each of the marinades used had a significant effect on reducing the maximum shear strength by 31% (liquid marinades) and by as much as 46% – base marinade. This relationship was confirmed in a sensory assessment, where higher notes for tenderness were given when base marinade (9.2 ± 0.3pts), marinade with buttermilk (8.1 ± 0.2pts), and marinades with vinegar and beer (7.3 ± 0.3pts) was used compared with control samples (5.7 ± 0.4pts).
This study has shown a beneficial effect of the marinades on the tenderness of the products. The most beneficial effect on the quality determinants under study was exerted by the base marinade, which consisted of herbs and condiments only.