فهرست مقالات Mixture Design

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  1 - Physical and Rheological Properties of Oil in Water Heat Stable Emulsions Made from Different Stabilizers
  A. Ahmadi-Dastgerdi A. Nasirpour E. Rahimi
  Oil in water emulsions have attracted considerable attention in food industry due to their large applications. In this study, the effect of thermal treatment on oil in water emulsions (o/w) containing 40% oil was studied. The emulsions were prepared using xanthan gum, g چکیده کامل

  Oil in water emulsions have attracted considerable attention in food industry due to their large applications. In this study, the effect of thermal treatment on oil in water emulsions (o/w) containing 40% oil was studied. The emulsions were prepared using xanthan gum, guar gum and carboxymethyl cellulose as stabilizer and polyoxyethylen sorbitan monooleat as emulsifier. A mixture design was used to define the percentage of each stabilizer to simulate wide range of emulsions. The emulsions were pasteurized at 87 ºC for 15 minutes. Thermal treatment had a considerable influence on rheological properties of the emulsions. Viscosity of all emulsions decreased after thermal treatment and stabilizers had increasing effect on this response. All emulsionsexhibited non Newtonianpseudo plastic flow behaviorthat often referred to as shear thinning (n<1). A non linear relation between shear rate and shear stress was observed. Shear stress versus shear rate data was successfully fitted to the Power-law model. Consistency coefficient (K) decreased and flow behavior index (n) increased after thermal processing. Thermal treatment caused an increase in particle size of emulsions because of coalescence. Some of emulsions had heterogeneous coalescence (bimodal) and some of them had homogenous coalescence (mono modal). All emulsions were stable to centrifugation and did not breakdown. It was found that surface tension was affected more by temperature than by stabilizer content. Surface tension decreased by thermal processing. Viscosity of all the samples was reduced during storage. The results showed that developed emulsions are thermally under pasteurization temperatures. پرونده مقاله
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  2 - Design and preparation of Magnesium (II) selective electrode based on novel synthetic ligand and optimization by D-optimal method
  Ahmad Adeli Razieh Sanavi Khoshnood S.Ali Beyramabadi Mehdi Pordel Ali Morsalia
  The utility of carbon as the base material for carbon paste electrodes has been considered for many years. In this work, we were applied MWCNT as a modifier and Schiff base chitosan and 5-nitro isatin as ionophore along with carbon. Prepared CPE shows a Nernstian respon چکیده کامل

  The utility of carbon as the base material for carbon paste electrodes has been considered for many years. In this work, we were applied MWCNT as a modifier and Schiff base chitosan and 5-nitro isatin as ionophore along with carbon. Prepared CPE shows a Nernstian response of 29.567 mV per decade in a wide linear dynamic range of 1.0 × 10-5 to 1.0 ×10-1 M for Mg2+ ion. The optimization process had performed by Mixture design in design expert software. This present sensor has a short time of response of about 10 s. The applicable pH range was obtained 3.51-9.0 and Detection limit was calculated 1.4 ×10-5 M. Lastly, the prepared sensor was used in the indirect potentiometry (potentiometric titration) as an indicator or working electrode. The data obtained from the experiments showed that the electrode is usable in analytical applications. پرونده مقاله