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Enzymatic hydrolysis of potato starch into maltose syrup in a tubular membrane reactor was studied. Hydrolysis and ultrafiltration conditions were determined in order to estimate the permeate flux and maltose concentration suitable for industrial production of maltose syrup. Experiments were made with different parameters such as: substrate: enzyme ratio, membrane porosity, transmembrane pressure...
The biological bases for the relation of the cereal grains low molecular weight antioxidants intake to the reduction of risk for chronic diseases caused by oxidative stress have been discussed in this article.
Porcine and bovine semimembranosus muscles were examined after, respectively, 24 h and 96 h from slaughter. The muscles were pressurised at 200, 300 and 400 MPa for 10 min. The pH value, pressure-induced drip, ability to hold free- and added water, and thermal drip were analysed. The pH values for muscles were found to increase with pressure. Pressurization at 200 MPa caused the greatest drip of meat...
The khapra beetle (Trogoderma granarium Everts) is one of the most harmful storage pests found on quarantine lists of all the EPPO member countries. The authors, therefore, undertook observations on the duration of the development of the khapra beetle on barley malt and on the kernels of some malting barley varieties, referring the results obtained to the duration of the pest's development on wheat...
Effects of enriching a non-modified diet of dyslipidaemic men and women with hull-less oats (Akt variety), contributing 10-15% to the diet's calorific content, on the levels of glucose, triacylglycerols, total cholesterol, HDL- and LDL-cholesterols, and fibrinogen were tested experimentally. The women eating the oat-enriched diet for 6 weeks were found to have reduced their triacylglycerol, total...
The studies on optimisation of citric acid biosynthesis by solid-state fermentation of sugar-beet pulp as the major material have shown that not only mono- and disaccharides initially present in the material but also the products of cellulose and hemicellulose hydrolyses were the carbon sources. Therefore, in parallel with optimisation of citric acid production, the studies were undertaken on the...
The colour pigments of paprika (Capsicum annuun) were separated by reversed-phase high-performance liquid chromatography (HPLC) using normal (4 mm I.D.) and microbore (2 mm I.D.) C18 silica columns and gradient elution (water-acetonitrile-methanol). The relative standard deviation of retention times (lower than 1.5%) and that of peak areas (3-5%) were similar for both columns proving the good stability...
Continuous cultivation of Trichodcnna reesei M-7 mutant was performed at different temperatures (26, 30 and 34°C) with 1% lactose or glucose alone or a total of 1% mixtures of both sugars at different ratio. The secretion of individual enzymes was affected by the ratio of cellulase inducer (lactose) to the repressor (glucose). The ratio of enzyme secretions was additionally modified by the temperature...
The purpose of the research was to develop the optimal palm oil/rapeseed oil blend for shallow and deep frying for household and commercial use as seen from the nutritional and technological points of view. In piloting experiment, fatty acids composition by GLC, oxidative stability by Rancimat1200C as well as several other indicators (e.g. IV, PV, FFA) were measured. It was found that 1:1 rapeseed/palm...
Effect of extrusion variables (temperature and moisture content) on amino acids, available lysine and in vitro protein digestibility of the extru- dates from pinto bean were studied. Chemical score (Cs) and essential amino acids (EAAI) indices were calculated on the basis of the amino acids composition of egg protein according to FAO/WHO. No significant changes in most amino acids were found between...
Five different extrudatcs were produced that were composed of ground oats, oat flour and corn groats. These substrates were used in different proportions: extrudates E1 and E5 did not contain corn groats but oats products only. The remaining extrudates (E2, E3, E4) contained corn groats and oats substrates in similar proportions. In the extrudates as well as in the mixtures of initial components the...
The aim of the study was to adapt the method of selenocysteine content determination elaborated by Jones et al. and Cone et al. for some oxidoreductive enzyme analysis as well as to modify it. Determination was based on usage of conventional amino acid analyzer. Modification consisted in introducing the stage of yeast protein purification from reagents after carboxymethylation process containing selenocysteine...
The objective of the study was to evaluate the effect of some technical parameters of the chopper, as: rotational speed of knives, rotation speed of the chopper bowl and the degree of the bowl filling on texture sensory profile of the model comminuted meat product. The model product of cooked sausage type was prepared in a pilot-plant scale. Basic composition of the product was analysed and the sensory...
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