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Celem niniejszej pracy była ocena wpływu utleniania, acetylacji oraz podwójnej modyfikacji (acetylacji i utleniania) na temperaturę przejścia szklistego (Tg) i krytyczne parametry przechowywania skrobi ziemniaczanej. Utlenianie skrobi prowadzono z zastosowaniem chloranu(I) sodu, natomiast acetylację – z wykorzystaniem bezwodnika kwasu octowego. Próbki o różnej aktywności wody (aw) uzyskano metodą...
Molecular oxygen (O2) is widely used as an oxidant in catalytic oxidation. This study was part of a biomimetic oxidation targeted at increasing the use of lignin in the production of chemicals through the application of salen transition metal catalysts. In this work, the catalytic performance of a cobalt-Schiff base catalyst Co(salen) in the presence of an oxidant and a ligand, such as pyridine, was...
The effect of temperature oxidation on micromechanical properties and the tribological behavior of the alloy Nb-Ti-Al has been investigated. The increasing of annealing temperature from 300 to 900 C leads to increasing of the internal stresses and microhardness in the micro/nanoscale of crystal lattice and reducing of the plasticity. The tribological properties of alloy after oxidation at temperature...
Celem pracy jest przegląd najnowszych wyników badań dotyczących wpływu różnych czynników na przebieg oksydacji lipidów w mięsie drobiowym. Ze względu na znaczny udział nienasyconych kwasów tłuszczowych jest ono szczególnie podatne na procesy utleniania tłuszczów. Oksydacja lipidów prowadzi do pogorszenia jakości produktu lub nawet jego zepsucia. Procesy jełczenia oksydacyjnego w mięsie mogą być wzmagane...
The results of studies on application of a mixture of active carbons of different surface properties in the process of purifying used frying oil are presented. The applied active carbons were prepared by heating commercial active carbon to temperature of 1000°C (ARW) and by oxidation with hydrogen peroxide (ARP2). Used frying rapeseed oil, for deep-frying of foodstuffs, was subjected to the adsorptive...
Dihydroksyaceton (DHA) jest ketotriozą o właściwościach redukujących. Znajduje zastosowanie głównie w przemyśle spożywczym (substancja słodząca, suplement diety, emulgator, plastyfikator), kosmetycznym (aktywny składnik kremów samoopalających) oraz w medycynie (leczenie bielactwa skóry, komponent biomateriałów tamujących krwotoki). Obecnie dihydroksyaceton wytwarzany jest biotechnologicznie na drodze...
An analysis of thermal decomposition in oxidative conditions of model wood-based materials glued with amino resin. The presented work includes the results of thermal analysis of model samples of particleboards glued with urea-formaldehyde resin with varying degree of sealing (5 ÷ 30%), which is a measurable factor changing the elemental nitrogen content in the samples. Changes of the kinetic parameters...
The catalytic properties of Cobalt salen? complex in the oxidation of a lignin model compound [veratrylglycerol-β-guaiacyl-α,γ-dimethylether, VGD] have been investigated in order to obtain the mechanistic aspects of the reaction between Co(salen) and VGD under an oxygen atmosphere using hydrogen peroxide as an oxidant. VGD was found to undergo structural changes in response to the catalytic reaction...
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