3. Results and Discussion
The effects of various parameters, such as blend proportions ratio of milk and banana, feed pump speed, the type of
dryer on the relative yield of the resultant powder, moisture content, solubility, dissolution were studied.
Considering that they were all responsible for the overall quality of the final dried powder.
3.1 Yield of banana milk powder
The yield of banana milk powder is affected by the type of the dryer, the feed pump speed used and the blend
feed ratio of milk banana proportion. Loss of product in a spray dryer may occurred during drying due to the
sticking of the particle solution around the drying chamber. Figure 2 shows the product produced using freeze
drying at 1:3 proportion. Dried powder cannot be produced using freeze dry at this proportion since most of the
product was freeze at the wall of the flask. This may be due to high solid content of the liquid mixture being used to
dry in the freeze dryer
It is showed that the blend proportion of 1M:1B in the spray dryer has the highest yield compared to other
proportions. This is because the solid content is lower than the other sample solution. From Figure 2,it is also
showed that the yield of the powder production decrease as the speed of the feed pump increases. The higher the
feed flow rate will cause part of the feed passed straight to the chamber without sufficient time of atomization
resulting in a higher of process waste and a lower process yield. According to Phisut,N.,(2012) at constant atomizer
speed and increased feed pump flow will cause more liquid atomized into the chamber and thus reduced drying
time. Hence, drying will be incorrect.
3.2 Moisture content analysis
Moisture analysis was test to identify the amount of the water content in the powder. The moisture content is
important since it can keep the quality of the powder. High moisture content will decrease the quality of the product
since it lower down the activity of bacteria in the food product. Figure 3 shows the percentage of moisture content
of the product after drying. The results showed that at constant pump feed speed 2 and freeze dryer , the moisture