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There is relatively little information concerning the bioavailability of thiamine from food products; nevertheless available data on thiamine show that this vitamin is a significant factor that plays an important role in their nutritional status. The bioavailability of thiamine depends on several factors of which food and diet composition appears to play a paramount importance.
The micro gold electrode modified by thiol layer was used as a working electrode in the cyclic voltammetry method. This analytical system was used for determining the neutral smell compounds: geraniol and coumarin. The decrease in reduction current value of [Fe(CN)6]-3 ions was observed already at the concentration of 10-5 M of the compound investigated. The dimensions of these changes were different...
The objective of the study was to determine the roasting-induced changes in texture, muscle fibre microstructure, and cooking losses for the bovine m.semitendinosus (ST) muscle. The muscle slices were roasted at 170°C until they reached the internal temperatures of 50, 60, 70, 80, 90 and 95°C. The texture profile analysis of the samples was carried out using a texture analyser. The changes in microstructure...
The number of microorganisms in the jejunum and stomach of rats on pectin diet was found to be increased. In the case of animals fed diet with potassium nitrate and 10% pectin, methaemoglobin appeared in the blood, what was associated with increased number of the bacteria Enterobacteriaceae responsible for the reduction of nitrates to nitrites.
The rapeseed protein preparations were obtained by isolation of proteins from the extracted, non-toasted meal by means of the fractionation and enzymatic modification of proteins with utilisation of membrane techniques. Enzymatic hydrolysis of proteins was performed during extraction by means of Alcalase 2.5L in the portion of 9 AU/kg of the substrate protein. To recover and purify the non-precipitating...
The aim of the study was (1) to determine changes in the total (TC), free (FC) and esterified (EC) L-carnitine (C) in plasma and urine of biathlonists ingesting various doses of C and (2) to find out whether the quantities of C ingested with the diet covered the metabolic needs for this compound. Male (n = 24) and female (n = 22) athletes, aged 17 years were divided in 4 groups given 0, 250, 500 and...
The objectives of this work were to characterise on a broad basis the staling process of wholemeal bread and to attempt to find the relationship between the instrumental and sensory measures. During seven consecutive days of bread storage at room temperature, the rheological, sensory and some physico-chemical analyses were carried out. The greatest changes in the instrumental measures, between which...
The content of carbohydrates soluble in water at 80°C was examined in wheat grain at the stages of incomplete maturity (33 and 40 days from blooming). High content of the carbohydrates was found, which rapidly decreased during grain development. The high-performance liquid chromatography of hot-water extracts showed several percentages of fructose and glucose and many times greater percentages of...
Oxidation of potato starch (PS) to dialdehyde starch (DAS) with simultaneous electrochemical recovery of periodate oxidant was studied. Increase in the degree of oxidation (DO) of DAS up to 13% was paralleled with increasing up the dose of iodate (V) up to 20%. At constant reaction time further doses of iodate (V) resulted in only small increase in DO. At constant dose of the oxidant DO of DAS was...
The objective of this work was to use the fluorometric method to study the antioxidative properties of the preparations obtained from the seed coats of red and brown beans. The preparations were obtained by extraction of the polyphenols with 0.5% HCl solution in methanol, vacuum concentration and lyophilisation. The qualitative and quantitative compositions of the preparations were determined. The...
The susceptibility of crystalline and amorphous proteins from beans to enzymatic hydrolysis were compared. The crystalline proteins were obtained by precipitating the crystals (5°C, 18 h) from acid extracts. The amorphous forms were obtained by isoelectric precipitation of proteins from alkaline extracts. The content of proteins in crystalline forms was higher (81-82%) than in amorphous forms (77%)...
A combination of immuno absorption and isoelectric focusing (IEF) was adapted for the study on the inheritance of α-amylase isozymes in tri ticale from its wheat and rye parents. It was shown that the isozyme pattern of tri ticale contained components present in wheat and rye. Quantitative differences between the spectrum of triticale and that of its parents, and in the rate of isozyme staining were...
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