Title
Combining ethanol pre-treatment and ultrasound-assisted drying to enhance apple chips by fortification with black carrot anthocyanin
Date Issued
30 March 2021
Access level
open access
Resource Type
journal article
Publisher(s)
John Wiley and Sons Ltd
Abstract
BACKGROUND: An interesting approach to improve dried foods nutritional properties, functionality, and sensorial attributes, is by taking advantage of pre-treatments for incorporating components into the food matrix. Based on this, this work studied the incorporation of black carrot anthocyanins in apple tissue by using ethanol (concentrations 0–300 mL L−1) as a pre-treatment to ultrasound-assisted convective drying. Samples were pre-treated in acidified ethanol solutions, with and without anthocyanins, and then dried (50 °C, 1 m s−1) by convective and ultrasound-assisted convective (21.77 kHz, 20.5 kW m−3) drying. Both the drying process improvement and the obtained product properties were studied. RESULTS: The anthocyanins did not influence the drying kinetics. In contrast, time reduction was > 50% by using both ethanol pre-treatments and ultrasound. Ethanol pre-treatments decreased the external resistance to mass transfer, while ultrasound decreased both internal and external resistances. The impregnation increased the anthocyanins (above 947%), which were retained after drying. Colour modifications after pre-treatments and after drying (L*, b*, h° decrease, and a* increase), and antioxidant capacity retention were observed in samples with anthocyanin addition. CONCLUSION: The results point that ethanol pre-treatments and ultrasound application can accelerate drying, and through the natural colouring incorporation during pre-treatments, the nutritional properties of dried samples were better retained. © 2020 Society of Chemical Industry.
Start page
2078
End page
2089
Volume
101
Issue
5
Language
English
OCDE Knowledge area
Ingeniería de producción Alimentos y bebidas
Scopus EID
2-s2.0-85092602015
PubMed ID
Source
Journal of the Science of Food and Agriculture
ISSN of the container
00225142
Sponsor(s)
This work was supported by the São Paulo Research Foundation (FAPESP, Brazil) (project number 2019/05043‐6); the National Council for Scientific and Technological Development (CNPq, Brazil) (P.E.D. Augusto productivity grant number 306557/2017‐7); the Fondo Nacional de Desarrollo Científico, Tecnológico y de Innovación Tecnológica (FONDECYT) from CONCYTEC, Perú (M.L. Rojas PhD scholarship contract number 087‐2016‐FONDECYT) and the INIA‐Spain and the ERDF funds (RTA2015‐00060‐C04‐02).
Sources of information: Directorio de Producción Científica Scopus