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The aim of the study was to compare the physicochemical properties and indices of shelf life stability of dry aged beef with wet aged beef under vacuum. The research material included two skeletal muscles (LL, m. longissimus lumborum, and ST, m. semitendinosus) taken from half carcasses of 8 head (3 bulls and 5 steers) of Whiteback cattle. The following parameters were measured: pH and oxidation-reduction potential (pH-metr Elmetron CP-401, ERH-12-6 i ERPt-13), water activity (HygroLab C1, Rotronic), and colour (according to CIE L*a*b* by Konica-Minolta 600d spectrophotometer). Reference methods were used to determine the content of moisture (PN-ISO 1442:2000), total protein (PN-A-04018:1975/Az3:2002, N × 6.25), and ash (PN-ISO 936:2000). The concentration of K, Na, Mg, Zn and Fe was determined by atomic absorption spectrometry using a Varian AA240FS spectrometer. Statistical analysis of the data was performed using STATISTICA 13 (Dell Inc.). The influence of the ageing type on the physicochemical properties and shelf life indices within muscles was verified by one-way ANOVA. A higher content of total protein and minerals, as well as lower hydration of muscle proteins were stated in dry aged beef. In turn, vacuum packaging had a stabilising effect for the colour of fresh meat (a lower value of ΔE), maintained the initial lightness (L*) and significantly increased chromatic saturation (a higher value of a* and b* coordinates). Application of acid whey (together with sea salt) positively influenced shelf life stability of dry aged beef, due to acidity increasing and lowering of moisture content and water activity. The obtained results indicate that beef from Whiteback cattle can be successfully used both for the production of wet aged beef under vacuum and for manufacturing dry aged raw beef. Each direction of use will be decided by the current market demand and consumer preferences. The present results support the need to continue research in this topic taking into account both other native cattle breeds and alternative methods of packaging.
The aim of the study was to assess the quality and safety of traditional smoked meats produced from the meat of Puławska breed pigs. The research material consisted of two skeletal muscles, namely, semimembranosus and longissimus dorsi, taken from 10 carcasses of Puławska breed fatteners. Smoked meats were produced with a 3% addition of salt, spices and acid milk whey (2%). The products were assessed in terms of their basic chemical components (water, protein, fat and salt), colour parameters in the CIE L*a*b* colour space and the content of contaminants, i.e. PAHs [chrysen, benzo(a)anthracene, benzo(b)fluoranthene, benzo(a)pyrene] and residues of nitrates (III) and (IV). The muscle type had no significant effect on the chemical composition of the products, although a higher content of fat and a lower content of salt were found in loin (by 2.79 and 0.38 percentage points, respectively). Smoked meat from longissimus dorsi was significantly lighter in colour (L*; 60.85 vs. 69.28), whereas smoked meats from ham showed a significantly greater degree of redness (a*; 13.24 vs. 8.75). The degree of yellowness of both products was similar (b*; 8.56 vs. 8.85). The content of 4 PHAs and B(a)P in smoked meats from ham was below the permissible limits for traditional products, which are 30 μg/kg and 5 μg/kg, respectively. In the case of smoked meats from loin, the threshold value (30 μg/kg) for the total of 4 PHAs was exceeded in two products, which affected their relatively high average content in smoked meat from this muscle (48.28 μg/kg). Nitrates III and IV were present only in one smoked meat from ham at the levels of 12 ± 2.7 mg/kg (expressed as NaNO₂) and 48 ± 11 mg/kg (expressed as NaNO₃), respectively. For the other products (from both ham and loin), the results were below the detection limit (results not presented in the table). From the nutritional point of view, the chemical composition of these smoked meats was beneficial: the protein content was high, the fat content was optimal, the content of table salt did not exceed the permissible limit, and there were only trace quantities of nitrates III and V. As far as PHAs are concerned, some measures should be taken to reduce their level, especially in smoked meats from loin.
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