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In the reported study, analyses were carried out to determine the effect of agglomeration and raw material composition on cohesive properties of model powdered formulas for children. Measurements were carried out in a uniaxial shearing test according to a measuring procedure following Jenike’s theory, at four levels of consolidating stress in the range of 4.6÷17.2 kPa. The examined powdered children...
Two PCR-based methods for identification of emetic toxin producing Bacillus cereus strains were developed. The first set of primers cesBF and cesBR allowed for the amplification of cesBI 838 bp long fragment of cereulide biosynthesis operon for cereulide producing strains, or 421 bp long fragment of nonribosomal peptide synthetase (nrps) for emetic toxin non producing strains. Detection of both genes...
The research was undertaken to examine the effect of the addition of comminuted out roasted at a temperature of 100°C on the oxidative stability of comminuted meat products during their chill storage. It was demonstrated that values of the redox potential of oat-supplemented products were lower during 30-day storage period as compared to values obtained for the control product. The products enriched...
The objective of the study was to analyse cellular structure of selected cereal products and its effect on acoustic emission generated during their breaking. Analyses were carried out for biscuits “A” and “B” and crackers. The structure of those products was determined by means of an electron scanning microscope FEI QUANTA 200 at 20x magnification, which enabled carrying out analyses in the natural...
The study was aimed at investigating caking of sweet whey powder and whey demineralized as a result of water vapor adsorption in respect of their sorption capacity. The analysis of the course of kinetic curves demonstrated that sweet whey was characterised by a higher capacity and rate of water vapour adsorption as compared to the demineralized whey. During storage at relative humidity of RH>0...
The aim of this study was to compare two research methods (visual and homogenization- colorimetrically) in the evaluation of the degree of discoloration of potato tubers. Three cultivars of potato tubers (Victoria, Asterix, Dorota) were selected for analyses. They originated from a plantation at which the following agricultural practices were applied in the vegetative season: herbicides, constant...
The study deals with the dependencies between indicators characterising the colored matter in cherry wines as well as three technological parameters: pH, sulfur dioxide, and alcohol. The experiment has been established in accordance with the CCRD system (Central Composite Rotatable Design) considering each of three independent variables at five different levels. Second-order polynomial equation has...
The aim of the study was to research the correlation of the level of PUFA (polyunsaturated fatty acids), PUFA-3, PUFA-6, EPA (eicosapentaenoic acid), DHA (docosahexaenoic acid), CLA (conjugated linoleic acids), MUFA (monounsaturated fatty acids), MUFA+PUFA and the proportion of PUFA-6/PUFA-3 in the profile of higher fatty acids of carp meat in the second year of life to the respective fractions in...
The objective is to investigate the importance of perceived health risk for consumers’ preferences to purchase functional food without and with genetically modified technology. An interview-assisted questionnaire on attitudes towards the metabolic syndrome, potential agro-food technologies and genetics in nutrition was applied within a Polish representative sample of 1005 adults. There was a tendency...
Sorption properties of some ingredients of muesli such as flakes and dried and candied fruits were investigated in this work. Kinetics of water vapor sorption at water activity of 1.00, 0,755, 0.239 and 0.00 was continuously measured. Kinetics of water sorption was well described by the solution of the Second Fick’s Law. However, the superficial values of equilibrium water content were obtained by...
The results of the study on the content of selected chemical components of watermelon (total sugars, reducing sugars, vitamin C, carotenoids and beta-carotene) of Polish cultivar ‘Bingo’ are presented in the paper. Cultivation was conducted in two successive vegetative seasons (2005 and 2006) near Bydgoszcz, with the use of drip irrigation. During seedling production three different variants of irradiation...
Results of rosemary oil microcapsulation process are shown in the presented work. The microcapsulation process has taken place in a spray dryer. The core of the microcapsules was maltodextrin. The two mass concentrations of maltodextrin in emulsion, i.e. 25%and 30%, one spray disc speed, inlet air temperature of 200oC and three feed fluid fluxes were used. Efficiency of closing rosemary aroma in the...
The effect of addition of single (shWPI) and double-heated whey proteins polymers (dhWPI) to set yoghurts and its influence on the rheological properties was investigated. The hardness of set yoghurt was investigated by TA-XT2i Texture Analyser. The yoghurt fermentation process was monitored by the oscillatory rheometer for 4 h at 43°C and next cooling to 4°C and stored for 3 h. The gelation of yoghurt...
Investigations were carried out into the effect of sonication of bee honeys on the course of their crystallization during storage. Use was made of ultrasounds with a frequency of 40 kHz and intensity of ca. 2 W/cm2. Analyses were carried out for physicochemical characteristics of honeys, including: viscosity, texture, conductance and crystallization degree. After 30-min sonication, an increase in...
The influence of food gums (guar, xanthan, arabic) and carboxymethylcellulose (CMC) on bitterness and astringency of caffeine and tannic acid has been studied. The study was performed in critical concentrations (c*) for particular hydrocolloids as well as for values above and below c*. The ability of hydrocolloids to reduce the astringency and bitterness was evaluated using the method of taste indicator...
The aim of this study was to evaluate the influence of light on the production of carotenoids by Phaffia rhodozyma CBS 5626 yeast. The fed-cultures at different illuminance were conducted: in the dark, at constant illuminance of 400 lux and 600 lux, at variable illuminance. It was found that illuminance and time had a significant effect on the level of carotenoids synthesized by Phaffia rhodozyma...
The study was undertaken to determine the effect of the type and composition of filling on changes in the content and activity of water in biscuits. The experimental materials were multi-layer short dough biscuits composed of three layers: bottom made of short dough, filling in the form fruit jelly or flavors mousse, and one-sided chocolate glazing. It was demonstrated that in the samples examined...
The aim of the study was to determine the effect of essential unsaturated fatty acids (EUFA) in fish oil supplemented to doe diets on rearing performance of young rabbits and quality of their meat obtained at the end of growth at 90 days of age. Feeding a pelleted mixture containing 4% fish oil had a varying effect on rearing performance of young rabbits. It enabled better weight gains to be obtained...
The experiment was performed on 121 Jersey cows in the years 2003/2004. The aim of this study was to determine the yields of ECM, milk fat and milk protein as well as milk fat content and milk protein content during four successive 305-day lactations as dependent on the genotypes and polymorphic variants of milk proteins. Depending on their genotype, the cows were divided into the following groups:...
This paper reports the use of an in vitro chemiluminescent method, ORACFL and SOD-like activity assays for the evaluation of antioxidant capacity of the whole buckwheat and its products after hydrothermal treatment. Phosphate buffer (0.75 mmol/L, pH 7.4) and 80% methanol (v/v) were used for the preparation of extracts originated from untreated buckwheat, hydrothermally-processed whole buckwheat, and...
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