title: Quality parameters in convective dehydrated carrots blanched by ultrasound and conventional treatment.
abstract: The effect of previous ultrasound and conventional blanching treatments on drying and quality parameters (2-furoylmethyl-amino acids -as indicators of lysine and arginine participation in the Maillard reaction-, carbohydrates, total polyphenols, protein profile, rehydration ratio, microstructure changes) of convective dehydrated carrots has been assessed. The most striking feature was the influence of blanching on the subsequent 2-furoylmethyl-amino acid formation during drying, probably due to changes in the protein structure. The highest values of 2-furoylmethyl-amino acids were found in carrots conventionally blanched with water at 95°C for 5 min. However, samples previously treated by ultrasound presented intermediate values of 2-furoylmethyl-amino acids and carbohydrates as compared to the conventionally blanched samples. Dried carrots previously subjected to ultrasound blanching preserved their total polyphenol content and showed rehydration properties, which were even better than those of the freeze-dried control sample. The results obtained here underline the usefulness of 2-furoylmethyl-amino acids as indicators of the damage suffered by carrots during their blanching and subsequent drying.
authors.affiliation: Instituto de Investigación en Ciencias de la Alimentación (CIAL) (CSIC-UAM), CEI (UAM+CSIC), Nicolás Cabrera, 9, E-28049 Madrid, Spain.
authors.forename: Juliana
authors.initials: J
authors.lastname: Gamboa-Santos
authors.forename: Ana Cristina
authors.initials: AC
authors.lastname: Soria
authors.forename: Mar
authors.initials: M
authors.lastname: Villamiel
authors.forename: Antonia
authors.initials: A
authors.lastname: Montilla
mesh_terms: D000596:Amino Acids / Q000737:chemistry; D018552:Daucus carota / Q000737:chemistry*; D003890:Desiccation; D005519:Food Preservation / Q000379:methods*; D015416:Maillard Reaction; D011786:Quality Control; D014465:Ultrasonics
chemical_list: D000596:Amino Acids