ASA Optimisation - Control of Particle Size, Stability and Hydrolysis

ASA Optimisation - Control of Particle Size, Stability and Hydrolysis Martorana, Emanuele ; Belle, Jürgen ; Kleemann, Stephan Emulsion , Teilchengröße , Hydrolyse ASA , Emulgierung sizing , alkenyl succinic anhydride (ASA) , emulsion , particle size , hydrolysis This work has shown that a reproducible ASA emulsification with optimal particle size is possible, and well controllable, in the laboratory. The most important factors for the adjustment of particle size are emulsification time, shear forces, ASA concentration and temperature. The protection colloid and the emulsifier used are also important factors for the particle size that can be achieved. Concerning the emulsification there is an optimum as regards particle size - which is mainly dependent on the starch or polymer to ASA ratio. The stability and hydrolysis of ASA emulsions depend mainly on pH, temperature and water hardness (Ca2+, Mg2+). However, the tendency to build up agglomerates and deposits is only caused by calcium ions, due to the fact that the ASAcid calcium salts are of much lower solubility than the magnesium salts. Agglomeration and hydrolysis can be reduced by increased starch addition or by the introduction of long-chain polymers such as polyacrylamides. It is surprising that the cationic charge of the used protection colloid showed almost no or even a negative influence on the emulsion and hydrolysis stability of the ASA. Furthermore, particle size plays an important role during the evaluation of hydrolytic stability and deposition. Therefore, it is very important that emulsions and different protection colloids should only be compared at the same particle size. However, high cationic liquid starches or the new “particle stabilized ASA” (bentonite or colloidal silica) seem to be the best alternative solution, as compared to the standard cooking starches. 2008 InProceedings englisch urn:nbn:de:bvb:m347-opus-172

ASA Optimisation - Control of Particle Size, Stability and Hydrolysis

Martorana, Emanuele ; Belle, Jürgen ; Kleemann, Stephan

Emulsion , Teilchengröße , Hydrolyse

ASA , Emulgierung

sizing , alkenyl succinic anhydride (ASA) , emulsion , particle size , hydrolysis

This work has shown that a reproducible ASA emulsification with optimal particle size is possible, and well controllable, in the laboratory. The most important factors for the adjustment of particle size are emulsification time, shear forces, ASA concentration and temperature. The protection colloid and the emulsifier used are also important factors for the particle size that can be achieved. Concerning the emulsification there is an optimum as regards particle size - which is mainly dependent on the starch or polymer to ASA ratio. The stability and hydrolysis of ASA emulsions depend mainly on pH, temperature and water hardness (Ca2+, Mg2+). However, the tendency to build up agglomerates and deposits is only caused by calcium ions, due to the fact that the ASAcid calcium salts are of much lower solubility than the magnesium salts. Agglomeration and hydrolysis can be reduced by increased starch addition or by the introduction of long-chain polymers such as polyacrylamides. It is surprising that the cationic charge of the used protection colloid showed almost no or even a negative influence on the emulsion and hydrolysis stability of the ASA. Furthermore, particle size plays an important role during the evaluation of hydrolytic stability and deposition. Therefore, it is very important that emulsions and different protection colloids should only be compared at the same particle size. However, high cationic liquid starches or the new “particle stabilized ASA” (bentonite or colloidal silica) seem to be the best alternative solution, as compared to the standard cooking starches.

2008

InProceedings

englisch

urn:nbn:de:bvb:m347-opus-172


ASA Optimisation - Control of Particle Size, Stability and Hydrolysis Martorana, Emanuele ; Belle, Jürgen ; Kleemann, Stephan Emulsion , Teilchengröße , Hydrolyse ASA , Emulgierung sizing , alkenyl succinic anhydride (ASA) , emulsion , particle size , hydrolysis This work has shown that a reproducible ASA emulsification with optimal particle size is possible, and well controllable, in the laboratory. The most important factors for the adjustment of particle size are emulsification time, shear forces, ASA concentration and temperature. The protection colloid and the emulsifier used are also important factors for the particle size that can be achieved. Concerning the emulsification there is an optimum as regards particle size - which is mainly dependent on the starch or polymer to ASA ratio. The stability and hydrolysis of ASA emulsions depend mainly on pH, temperature and water hardness (Ca2+, Mg2+). However, the tendency to build up agglomerates and deposits is only caused by calcium ions, due to the fact that the ASAcid calcium salts are of much lower solubility than the magnesium salts. Agglomeration and hydrolysis can be reduced by increased starch addition or by the introduction of long-chain polymers such as polyacrylamides. It is surprising that the cationic charge of the used protection colloid showed almost no or even a negative influence on the emulsion and hydrolysis stability of the ASA. Furthermore, particle size plays an important role during the evaluation of hydrolytic stability and deposition. Therefore, it is very important that emulsions and different protection colloids should only be compared at the same particle size. However, high cationic liquid starches or the new “particle stabilized ASA” (bentonite or colloidal silica) seem to be the best alternative solution, as compared to the standard cooking starches. 2008 InProceedings englisch urn:nbn:de:bvb:m347-opus-172