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Encapsulation of Gallic Acid with Acid-Modified Low Dextrose Equivalent Potato Starch Using Spray- and Freeze-Drying Techniques
 
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Publication date: 2018-09-30
 
Pol. J. Food Nutr. Sci. 2018;68(3):273–280
 
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ABSTRACT
The main objective of the present study was to investigate the effect of spray- and freeze-drying technologies on the microencapsulation of a gallic acid compound using the acid-hydrolyzed low dextrose equivalent potato starch as a wall material. During the experiment, it was possible to achieve encapsulation efficiency of 70–84% for the freeze-dried and 65–79% for spray-dried samples, without statistically significant difference (P>0.05) in the encapsulation efficiency between the mentioned methods. Spray-dried samples formed spherical capsules with a HIGHER number of micropores. Meanwhile, freeze-dried samples were shapeless, exposed larger pore volume (from 2.4×10-3 to 9.5×10-3 cm3/g against 1.2×10-3 4.9×10-3 cm3/g; analyzed by Barrett-Joyner-Halenda method) and overall higher surface area (0.632–1.225 m²/g against 0.472–1.296 m²/g; analyzed by Barrett-Joyner-Halenda method). Due to this fact, more phenolics were exposed to environmental factors and can be counted as losses. In addition, freeze-dried samples demonstrated lower water activity than spray-dried samples (0.075±0.014 against 0.178±0.008). Results showed that it is not practical to use freeze-drying for modelling encapsulation technology for food industry without a special necessity for protection of easily degradable chemical compounds. The present work makes a basis for the future studies of the microencapsulated phenolics application in food production.
 
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