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Triticale starches were y-radiated at the doses from 0.1 to 5.0 kGy to study, comparatively to wheat starch, the effects on reducing value, water solubility, water binding capacity, and rétrogradation. Triticale starches were found to be more resistant to y-radiation than wheat starch. The doses ranging from 0.1 to 2.0 kGy had a little effect on the reducing value of triticale starches with the dose of 5 kGy resulting in a more pronounced effect. Water binding capacity and water solubility increased and the paste viscosity decreased upon y-radiation of triticale starches. The dose of 2 kGy decreased the rétrogradation of Lasco triticale starch, whereas it increased the rétrogradation of Grana wheat starch.
An ultrasonic viscometry method has been applied to study enzymie milk coagulation. Time elapsing to the starting of the change of milk viscosity as caused by proteolytic enzyme is directly correlated to reciprocal enzyme concentration and the rate of the change stands in close correlation to enzyme concentration. The method based on these correlations may be used to determine milk clotting activity and to establish the suitability of enzymes for cheese-making.
The effects of γ-irradiation on the browning reaction in the model system of fructose-alanine solution were investigated. The irradiation was followed by the heating of the solution at 100°C to develop the brown colóur. The run of the reaction was determined spectrophotometrically by measuring the absorbance at 450 nm. The optical spectra of irradiated and heated solutions of fructose-alanine exhibit a broad absorption maximum at about 280 nm.
It was observed that within the pH range between 5.57 and 6.37 the time of development of the secondary phase of the rennet milk coagulation is independent from temperatures between 25° and 35°C. Increased concentration of Ca-ions between 0.66 and 1.1 mg CaCl₂ /ml milk accelerates the formation of the secondary phase.
The ultrasonic viscometric method is applied to study the secondary phase of milk coagulation which has been initiated by immobilized rennin. The physico-chemical parameters for the secondary phase are evaluated.
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