Search results for "Ethoxylation"
showing 3 items of 3 documents
’Structural constraints in cyanobacteria-mediated whole-cell biotransformation of methoxylated and methylated derivatives of 2′-hydroxychalcone
2019
Halophilic and freshwater strains of cyanobacteria representing the Oscillatoriales, Nostocales, Chroococcales, and Synechococcales orders of Cyanophyta were examined to determine (i) the resistance of their cultures when suppressed by the presence of exogenous methoxylated and methylated derivatives of 2'-hydroxychalcone, (ii) morphological changes in cells treated with the tested chalcones and, most importantly, (iii) whether these photoautotrophic microorganisms transform chalcone derivatives in a structure- or strain-dependent manner. The growth of cyanobacterial cultures depended on chalcone derivatives and the strain; nevertheless, trends for correlations between these parameters are …
The Effect of Calcium on the Cohesive Strength and Flexural Properties of Low-Methoxyl Pectin Biopolymers.
2019
Abstract: Pectin binds the mesothelial glycocalyx of visceral organs, suggesting its potential role as a mesothelial sealant. To assess the mechanical properties of pectin films, we compared pectin films with a less than 50% degree of methyl esterification (low-methoxyl pectin, LMP) to films with greater than 50% methyl esterification (high-methoxyl pectin, HMP). LMP and HMP polymers were prepared by step-wise dissolution and high-shear mixing. Both LMP and HMP films demonstrated a comparable clear appearance. Fracture mechanics demonstrated that the LMP films had a lower burst strength than HMP films at a variety of calcium concentrations and hydration states. The water content also influe…
Investigation of propoxylation and ethoxylation of 2-ethylhexanol in the presence of an alkaline and DMC type catalyst at initial stages of the synth…
2016
This paper reports results from monopropoxylation and monoethoxylation of ethylhexyl alcohol performed in the presence of KOH and DMC type catalysts, respectively. The existing differences are discussed in terms of kinetic performance of the syntheses, as well as compositions of the obtained products. The investigated DMC type catalyst showed 60 to 70 times higher conversion rates, narrower homologue distributions and higher selectivity, as compared to KOH. Interpretation of the experimental results was performed using kinetic parameters of the Wejbul Nycander Gold model and the Natta Mantica relationships. In spite of any differences between the reactivity of the investigated catalysts and…