2002/10/14 by F. Shishehgarha, Joseph Makhlouf, Cristina Ratti · 1 citation
Agricultural and Biological Sciences · Engineering · Chemistry · #Microencapsulation and Drying Processes #Food Drying and Modeling #Freezing and Crystallization Processes #Dehydration #Freeze-drying #Shrinkage #Chemistry #Hue #Glass transition #Food science #Horticulture #Materials science #Composite material #Chromatography #Biology
paper · doi:10.1081/drt-120001370
openalex publication_date 2002/10/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29
Drying kinetic, as well as color and volume variation, of whole and sliced strawberries were investigated after freeze-drying under various temperatures (30, 40, 50, 60 and 70°C). Dehydration time increased proportionally to the thickness of the product and heating plate temperature markedly reduced it. Freeze-drying caused a pronunciation in red color of strawberries. A decrease in hue angle by 22.5% (skin) and by 42.4% (pulp) was noted, with no significant effect of freeze-drying temperature up to 70°C. The strawberries had a volume reduction of 8% (whole) and 2% (sliced) due to freeze-drying although the level of shrinkage was also independent of freeze-drying temperature. However, the percentage of collapsed strawberries increased with process temperature. At heating temperatures higher than 50°C, the strawberry dry layer temperature was higher than the estimated glass transition temperature of dried fruit, increasing the risk of collapse.