The effect of different concentrations of sugar solution (hypertonic) (30%, 45% and 60% w/v) and carboxyl methyl cellulose (CMC) (0%, 1% and 2% w/v) coating on freeze drying of apple slices was studied. In total, nine treatments with respect to concentrations of hypertonic solution and coating layer were prepared to analyze their influence on the physical and chemical properties of freeze dried apple slices. It was observed that increase in the sugar solution concentration, decreased the moisture content of the apple slices significantly impacting its water activity, texture and sugar gain. Application of different concentrations of CMC coating had no significant effect on the properties of dried apple slices. A significant change was observed for color of CMC coated freeze dried apple slices pretreated with 60% sugar solution. Drying kinetics of pretreated apple slices were fitted by using two drying models, Newton’s and Page’s. Page’s model showed higher R-square and lower root mean square error (RSME) compared to Newton’s model.
|Number of pages||13|
|State||Published - Jun 2013|
Bibliographical noteFunding Information:
The authors are grateful to NSERC (Natural Sciences and Engineering Research Council of Canada) for their financial support for this study. Authors would also like to extend their gratitude to Yvan Gariepy for his constant support and suggestions during the course of the study.
© 2013 by the authors; licensee MDPI, Basel, Switzerland.
- Apple slices
- Carboxyl methyl cellulose coating
- Drying kinetics
- Freeze drying
ASJC Scopus subject areas
- Food Science
- Health(social science)
- Health Professions (miscellaneous)
- Plant Science