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A study was undertaken in order to monitor the effect of vibrations with variable frequency (10-60 Hz) and different times of exposure to vibrations (30 and 120 min) on changes in selected physicochemical properties of milk, especially those determining its technological usability. Vibrations were found to negatively affect the properties of milk significant from the technological point of view, producing...
The study was aimed at developing, in the spreadsheet environment, an application for the assessment of product batch compliance with values provided in product’s specification, by applying parametric tests method. The investigation was carried out on batches of selected products consisting of 300 pieces of packed product. Dixon’s Q test was applied for verification of the data obtained aiming at...
The influence of the addition of cheese base on some physicochemical and textural properties of processed cheese spread was investigated. Cheese base was obtained from whole milk (3.2% fat) concentrated by UF (CF=4–5), inoculated with yoghurt starter culture and fermented at 44±1oC until its pH dropped down to 5.1–5.2. Cheese base was used for the production of processed cheese spread standardised...
The paper focused on the evaluation of a fatty acid profile and mineral component contents in milk obtained from cows of 5 breeds maintained in Poland. The studies covered 147 milk samples collected from cows of Polish Holstein-Friesian black-white (42) and red-white (26) varieties, Simental (31), Whitebacks (15) and Polish Red (33). Milk was sampled at the spring-summer season when dietary units...
This work was addressed to monitor some quality indicators content in commercial powdered infant milk formulas. Furosine, furfural compounds, vitamins (B1, B2, B6, and C) were determined in starting and follow-up infant milk formulas. Contents of furosine, total and free furfural compounds, and B group vitamins were assayed by RP-HPLC with UV detection. The contents of furfural (F), free and total...
A method is described for the determination of bovine milk in cheeses by polyacrylamide gel isoelectric focusing according to EC reference method on ready-to-use gel plates. The advantages of this method are easy to use handling and good reproducibility by application of ampholytes with high concentration of urea. The method includes (i) recovery of cheese proteins fat and salt free; (ii) hydrolysis...
Securing food safety is one of the priority political tasks of almost every country. Assessment of risk in its microbiological aspect is a systematic process of identification and evaluation of hazards resulting from microbiological contaminations. Predictive microbiology that serves identification and understanding of microorganisms’ ecology in food, influence of the technological process, distribution...
The aim of the research project was to assess the quality parameters of goat milk permeate subjected to the fermentation process with the assistance of thermophilic cultures of traditional composition and enriched with probiotic strains. The fermented permeates were stored in refrigerated conditions for 6 weeks and during this period, changes in their active and titratable acidity were estimated,...
Milk fat retention in cheese was determined during the production of six various types of cheese, Ementalski, Gouda, Mazurski, Tylżycki, Warmiński and Jeziorański, at different dairy plants (DP-A, ... DP-F), depending on the technological and technical conditions of the production process, taking into account seasonal changes in milk composition. A statistical analysis of the results showed that in...
The aim of the present study was to determine the effects of temperature, the strength of coffee infusions and the addition of saccharose and CaSO4 on the degree of reconstitution of selected milk concentrates. The following coffee additives were used: dried milk concentrates (instant whole milk powder, skim agglomerated milk powder and coffee whitener “Cremilka”), evaporated UHT milk, 12% UHT coffee...
The aim of the work was to analyse differentiation of calcium and dairy products intake by older women in a retrospective analysis, taking into consideration place of residence. The study was carried out in two stages in years 1999 and 2004 among 192 women aged 75-80 living in the city, town and country. In the first stage, nutrition manner was evaluated, using the 24-h recall method. After 5 years...
The growth of pathogenic microflora was monitored in fresh white cheeses stored for 7, 14 and 21 days at a temperature of 5oC±0.5oC, packed under vacuum, modified atmosphere and air atmosphere conditions. The fresh and stored white cheeses were determined for the numbers of Listeria monocytogens, Enterococcus spp, coli group bacili, and Escherichia coli. The results obtained indicated that the method...
The paper proposes two methods of expressing the turnover of foreign trade in dairy products using a milk equivalent. The first of them is based on applying conversion ratios indicating how many liters of milk are needed to manufacture a unit of a given product. The ratio allowing calculation of butter quantity that could be obtained from fat retained during processing milk into individual products...
During this study quality and declared health features of probiotic yogurt milk were assessed. Using the methods of statistical analysis a tool was developed allowing verification of formulated statistical hypotheses. It was established that no statistically significant differences were present in the assessment of the number of microorganisms dependent on the dilutions applied. It was shown that...
The study included 9339 people aged from 13 to 75 years, inhabiting 6 macro regions of Poland. Thirty choice factors of dairy products were evaluated. A statistical analysis of the results obtained was carried out after separating the following factors: sensory, functional, health, economic and socio-cultural ones. Dairy product’s choice was more affected by sensory and functional factors than the...
The objective of the research was to assess the changes in the quality and shelf life of tvarog wrapped in Eco Lean and packed either under vacuum or atmospheric air, during its storage in refrigerated conditions. The performed investigations comprised the following analyses: physicochemical (whey drainage, water and fat content, pH, titrable acidity, content of free fatty acids, colour indices),...
The chemical composition and fatty acid profile of milk from French Alpine dairy goats, obtained during the period of summer feeding and winter feeding, were studied. Milk samples were collected at one-month intervals, to determine dry matter, solids non-fat, protein, fat, fatty acid profile, lactose, urea and somatic cell count. The fatty acid composition of milk fat was determined for particular...
The investigations included 333 milk samples obtained from cows of 6 breeds maintained in Poland, i.e. Polish Holstein-Friesian black-white (150) and red-white (40) variety, Simental (29), Whitebacks (28), Jersey (37) and Polish Red (49). Milk was collected in the spring-summer season, when the dietary units included green forage. At the milk sampling a lactation phase was regarded, that is up to...
This review is a brief description of the current state of research on the functional and bioactivite properties of caseins, their hydrolysates and peptides. The functional properties of casein and casein-originated hydrolysates and peptides reflect the natural features of their molecules and environmental characteristics. Many proteolytic enzymes are used for modifying functional and biological properties...
The study was aimed at determining the impact of the milk production period and selected dairy products on the level of external chemical compound residues in milk. For this reason the experimental material was sampled in the summer and in winter season. A total of 120 dairy products were assayed for the concentrations of lead, cadmium, Σ DDT (as a total sum of DDT+DDE+DDD), γ HCH, total PCB, nitrates...
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