Response surface optimisation of spray dryer operational parameters for low‐phenylalanine skim milk powder

Abstract

The aim of this study was to optimise the spray-drying process for low-phenylalanine (low-Phe) milk. Influence of inlet air temperature (100, 150 and 200°C), feed flow rate (5, 10 and 15 mL min )1 ) and air flow rate (400, 600 and 800 L h )1 ) on the solubility, yield, water activity and moisture content (MC) of the milk powder were assessed using response surface methodology. The following optimum process parameters were determined: inlet air temperature of 160°C, feed flow rate of 8 mL min )1 and air flow rate of 400 L h )1 . The predicted values for the solubility, yield, water activity and MC were 98.77%, 88.08%, 0.263% and 5.48%, respectively. With the optimum parameters, the experimental values for the solubility, yield, water activity and MC were 97.56 ± 0.03%, 87.00 ± 0.10%, 0.26 ± 0.01% and 5.53 ± 0.08%, respectively. The similarity of the experimental results to the predicted values verified the models.

Optimization of spray drying process parameters for kefir powder using response surface methodology

“…Water activity increases with decreasing of the inlet temperature (Table 3). These findings agrees with reported by Amiri-Rigi et al (2011) who determined that inlet air temperature and feed flow rate affected water activity significantly (p < 0.001). Fig.…”

Characterisation of spray‐dried microparticles containing iron coated by pectin/resistant starch

“…In the present study, the yield of powder was 72.07%. Due to the higher total electric charge of the small particles and their light weight, the stickiness of these particles to the instrument wall and the removal of them through the vacuum line increase (Prinn et al ., ; Amiri‐rigi et al ., ). In this study, the size of particles was measured 3.5 ± 1.14 μm, which was fine enough to be lost by the reasons described above.…”

“…Therefore, the relatively low solubility of the powder helps to its low absorption in the upper gastrointestinal tract and decreases the interfering effect of released Fe 2+ on other cationic minerals in the small intestine. It has been reported that high temperatures result in higher solubility of powders due to decreased cohesion rates (Amiri‐rigi et al ., ). However, in this study, in addition to high temperature, the use of HACS limited the powder solubility.…”

“…Yield of spray‐dried microparticles was calculated by the following equation (Amiri‐rigi et al ., ):…”

Antimicrobial activity of carboxymethyl cellulose–gelatin film containing Dianthus barbatus essential oil against aflatoxin‐producing molds

“…p values < .05 were considered statistically significant for all comparisons. Values were reported as mean ± standard deviation ( SD ) of duplicate treatments (six repetitions for each formula) (Amiri‐Rigi, Mohammadifar, Emam‐Djomeh, & Mohammadi, ).…”