Fruit juice powders obtained by spray drying may have some problems in their properties, such as stickiness, hygroscopicity and solubility, due to the presence of low molecular weight sugars and acids, which have low glass transition temperature (Bhandari et al., 1993). Thus they can stick on the dryer chamber wall during drying, leading to low product yield and operational problems.
Part of these problems can be solved by the addition of some carrier agents, like polymers and gums, to the product before being atomized. Besides reducing powder hygroscopicity, such agents, normally used for microencapsulation, can protect sensitive food components against unfavorable ambient conditions, mask or pre- serve flavors and aromas, reduce the volatility and reactivity and provide additional attractiveness for the merchandising of food products (Ré, 1998).
Fruit juice powders obtained by spray drying may have some problems in their properties, such as stickiness, hygroscopicity and solubility, due to the presence of low molecular weight sugars and acids, which have low glass transition temperature (Bhandari et al., 1993). Thus they can stick on the dryer chamber wall during drying, leading to low product yield and operational problems.Part of these problems can be solved by the addition of some carrier agents, like polymers and gums, to the product before being atomized. Besides reducing powder hygroscopicity, such agents, normally used for microencapsulation, can protect sensitive food components against unfavorable ambient conditions, mask or pre- serve flavors and aromas, reduce the volatility and reactivity and provide additional attractiveness for the merchandising of food products (Ré, 1998).
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