KINETICS OF OSMOTIC DEHYDRATION OF APPLES WITH PECTIN COATINGS

ABSTRACT

The solids gain and water loss during osmotic dehydration of coated apples were found to be dependend on concentration of pectin solution (0.5–4%) and drying time of coated apples (0–40 min). The coated apples were found to have generally a smaller the solids gain and higher or the same water loss than uncoated samples. For analysed low methyled pectin solutions and drying time the best for coating the apples before osmotic dehydration considering the highest water loss and the smallest solids gain was 2% pectin solution and 10 min drying time.

Key Words and Phrases:

• calcium chloride
• drying time
• low methyled pectin
• solids gain
• sucrose and glucose solution
• water loss