Conclusion
Ultrasound pre-treatment and osmotic dehydration enhanced
the colour in strawberry samples, especially after
prolonged ultrasonic exposure and applying high sucrose
concentrations with the pre-treatment. Freeze-dried strawberry
subjected to ultrasound presented a more reddish and
vivid colour then the fresh and non-treated strawberries.
Acknowledgments The authors thank the financial support provided
through the Hatch Act, USDA, the College of Engineering at the
University of Nebraska-Lincoln, USA and the Brazilian funding institutes
CNPq and CAPES.