Submitted to: Food and Bioprocess Technology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: June 24, 2008
Publication Date: September 1, 2009
Citation: Shi, J., Pan, Z., Mc Hugh, T.H., Hirschberg, E. 2009. Effect of Infusion Method and Parameters on Mass Transfer in Blueberries. Food and Bioprocess Technology. 2:271-278. Interpretive Summary: This research studied the effect of infusion conditions of blueberries on the solid gain and infusion rate. The results provided important information about selection of the appropriate infusion conditions.
Technical Abstract: In order to obtain optimal processing conditions for producing infused blueberries with high solid gain, we investigated the infusion characteristics of blueberries under various processing parameters in sugar solutions with 1:1 ratio of solution and berries. Static batch constant concentration infusion and dynamic batch infusion (DBI) were tested as the alternative operations for the traditional static batch infusion. The studied parameters were solution temperature (25 to 70°C), concentration (20 to 70°Brix), and types of osmotic agent (fructose, dextrose, polydextrose, sucrose, maltodextrin and corn syrup). The results showed that high solid gain can be achieved by maintaining high and constant concentration of infusion solution at a high temperature with dynamic infusion. For DBI, high temperature and high solution concentration resulted in fast and high solid gain. The rate of water loss increased with an increase in solution temperature and concentration. To obtain high quality sugar-infused products with high product yield, a DBI process of 50°C and 50°Brix sugar infusion is recommended, which could have a solid gain of 1.65 g/g after a 5-h infusion. Polydextrose showed a higher solid gain than sucrose when the infusion time was longer than 180 min, although it had a lower solid gain in short-term infusion.