Concentrations Of Aluminium Chloride Research Articles

The effect of aluminium ions on chemical and functional properties of spun protein fibers

AbstractDependent on the pH, time and temperature, increasing concentrations of aluminium chloride cause an increase of firmness and a decrease of solubility of Vicia faba protein/casein (1:1) fibers. This effect is accompanied by a loss of sulfhydryl and reactive disulfide groups as well as by a masking of reactive disulfide groups and it is interpreted by a formation of trivalent aluminium coordination complexes with carboxyl and sulfhydryl groups of the protein, thus resulting in a crosslinking.Dependent on sodium hydrogen carbonate concentration, time and temperature, an increasing sodium chloride concentration leads to a further improved firmness of the protein fibers. By this treatment a further masking of reactive disulfide groups does not take place and therefore the effect on the firmness of the protein fibers may be explained by a stabilization of the crosslinkages.

Silicon heterocycle redistribution reactions

The cyclosilthian-cyclotrisilazane reaction reported by Moedritzer and van Wazer has been found to occur in three other systems. In each of these two new compounds were formed. Analysis of the cyclotrisilthian-cyclotetrasiloxane system gave anomalous results. Attempts to interchange cyclosiloxanes with cyclosilazanes and hexamethylcyclotrisithian were not successful, and no interchanges could be observed in systems containing sym-octamethylcyclotetrasiloxazane. Redistribution of tetraethylsilane with methylsiloxane mixture took place to some extent in the presence of large concentrations of aluminium chloride.