Fig extract drying: The relationship between the main operating parameters of a pilot‐scale spray dryer and product specifications

Fig extract drying: The relationship between the main operating parameters of a pilot‐scale... This study aims to optimize extraction and drying conditions of fig syrup. Drying was done in a pilot scale two‐fluid nozzle spray dryer. A total of 27 experiments were conducted with varying inlet air temperatures, air flow rates, and also a maltodextrin (MD)‐ low methoxyl pectin (LMP) ratios. While feed rate, feed temperature, and compressed air flow rate of the atomizer were kept constant. The results of differential scanning calorimetry revealed that high levels of glucose and fructose in the extract resulted in a low glass transition temperature of fig syrup. By an increase in the inlet air temperature, the powder bulk density decreased. However, the MD:LMP ratio and the air flow rate were not significantly effective (p < 0/05) in changing the bulk density. SEM micrographs of spray‐dried particles and particle size distribution analysis showed that particles were largely in a range of 5 to 50 μm. The best powders were obtained at an inlet air temperature of 170°C. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Food Science & Nutrition Wiley

Fig extract drying: The relationship between the main operating parameters of a pilot‐scale spray dryer and product specifications

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Publisher
Wiley Subscription Services, Inc., A Wiley Company
Copyright
© 2018 Published by Wiley Periodicals, Inc.
ISSN
2048-7177
eISSN
2048-7177
D.O.I.
10.1002/fsn3.558
Publisher site
See Article on Publisher Site

Abstract

This study aims to optimize extraction and drying conditions of fig syrup. Drying was done in a pilot scale two‐fluid nozzle spray dryer. A total of 27 experiments were conducted with varying inlet air temperatures, air flow rates, and also a maltodextrin (MD)‐ low methoxyl pectin (LMP) ratios. While feed rate, feed temperature, and compressed air flow rate of the atomizer were kept constant. The results of differential scanning calorimetry revealed that high levels of glucose and fructose in the extract resulted in a low glass transition temperature of fig syrup. By an increase in the inlet air temperature, the powder bulk density decreased. However, the MD:LMP ratio and the air flow rate were not significantly effective (p < 0/05) in changing the bulk density. SEM micrographs of spray‐dried particles and particle size distribution analysis showed that particles were largely in a range of 5 to 50 μm. The best powders were obtained at an inlet air temperature of 170°C.

Journal

Food Science & NutritionWiley

Published: Jan 1, 2018

Keywords: ; ; ; ;

References

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