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Open AccessArticle

Physicochemical Properties of Guava Snacks as Affected by Drying Technology

School of Food Engineering, University of Valle, Cali 760031, Colombia
Author to whom correspondence should be addressed.
Processes 2020, 8(1), 106;
Received: 20 October 2019 / Revised: 27 December 2019 / Accepted: 10 January 2020 / Published: 14 January 2020
(This article belongs to the Special Issue Drying Kinetics and Quality Control in Food Processing)
Guava is widely consumed because of its agro-industrial use, and its antioxidant properties attributed to vitamin C and carotenoids content. However, it has a short shelf life. Guava has been dried by atomization, fluidized bed, lyophilization (FD) and convective drying (CD). CD requires long operation times and the product characteristics are not desirable. In contrast, FD produces high quality products, but requires long processing times, high energy consumption and high operation costs. As an alternative, the Refractance Window® (RW) drying is relatively simple and cheap technique. The objective of this study was to compare the effect of CD, FD and RW techniques, on the moisture content, water activity, color, porosity, volume change, vitamin C and carotenoids content in guava samples. The samples dried by RW required less time to reduce the moisture content and exhibited smaller changes in color than CD or FD. There were greater losses of carotenoids and vitamin C when drying by CD whereas RW had similar losses than FD. Lyophilized products exhibited minor change in volume and greater porosity. RW results in better retention of properties, compared with other drying techniques. Based on this, RW is a promising technique for the development of guava snacks. View Full-Text
Keywords: convective drying; lyophilization; Refractance Window®; guava; properties convective drying; lyophilization; Refractance Window®; guava; properties
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MDPI and ACS Style

Leiton-Ramírez, Y.M.; Ayala-Aponte, A.; Ochoa-Martínez, C.I. Physicochemical Properties of Guava Snacks as Affected by Drying Technology. Processes 2020, 8, 106.

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