Effect of solar drying methods on color kinetics and texture of dates

Seerangurayar, T. and Al-Ismaili, Abdulrahim M. and Jeewantha, L.H. Janitha ORCID: https://orcid.org/0000-0002-0244-6159 and Al-Habsi, Nasser Abdullah (2019) Effect of solar drying methods on color kinetics and texture of dates. Food and Bioproducts Processing, 116. pp. 227-239. ISSN 0960-3085


The present work investigates the effect of solar drying methods on the color and textural attributes of Khalas dates at three ripening stages (khalal, rutab and tamr) and evaluates color change kinetics using three kinetic models. Three solar drying methods, namely, open sun drying (OSD), forced convective drying (FCD) and greenhouse tunnel drying (GTD) were studied. The drying methods and ripening stages had significant effect on all color attributes. Khalal stage dates dried in FCD had the lowest color variations (L*: −12%, a*: +4%, b*: −46%, chroma: −38%, hue angle: −21% and total color change, ΔE:14.05) and thus, the highest color stability. At the end of drying, color of rutab and tamr stage dates changed red-brown in all the three drying methods due to the massive loss of b* (88–92%) and hue angle (63–73%), and altering hue angle from 23° (tamr fresh) to 9–12° (dried), respectively. The most appropriate model to describe the color change kinetics of dates at the three ripening stages was the fractional conversion model. The texture profile analysis revealed that FCD produced the softest dates for all the three ripening stages (hardness ranged 2.52–3.42 N). Overall, dates dried in FCD had the best color and textural properties as compared to the OSD and GTD dried dates in all ripening stages.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 27 Jan 2021 04:57
Last Modified: 31 Jan 2021 23:19
Uncontrolled Keywords: Dates; Open sun drying; Forced convective solar dryer; Greenhouse tunnel dryer; Color kinetics; Texture
Fields of Research (2008): 07 Agricultural and Veterinary Sciences > 0705 Forestry Sciences > 070510 Wood Processing
Fields of Research (2020): 30 AGRICULTURAL, VETERINARY AND FOOD SCIENCES > 3006 Food sciences > 300604 Food packaging, preservation and processing
30 AGRICULTURAL, VETERINARY AND FOOD SCIENCES > 3006 Food sciences > 300607 Food technology
Identification Number or DOI: https://doi.org/10.1016/j.fbp.2019.03.012
URI: http://eprints.usq.edu.au/id/eprint/40935

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