Abstract

GALLEGO-CASTILLO, Sonia  and  AYALA-APONTE, Alfredo Adolfo. Changes in physical properties of sweet potato due to effects of thermal pre-treatments for puree production. Dyna rev.fac.nac.minas [online]. 2018, vol.85, n.207, pp.135-142. ISSN 0012-7353.  https://doi.org/10.15446/dyna.v85n207.72876.

In response to increasing consumer demand for high-quality, easy-to-prepare foods, it is necessary to develop innovative ways to use roots and tubers, such as sweet potatoes, in processed foods. Thus, two thermal processes were evaluated, freezing-cooking (F+C) and blanching-freezing-cooking (B+F+C) on the physical properties of the orange-fleshed sweet potato (OFSP) cultivar, which has a high content of β-carotene, in terms of drip loss (Δm), volume variation (ΔV), color, and texture. Cylindrical samples of OFSP were used. Blanched and unblanched samples were stored by freezing, at -18 °C for 2 months, and subsequently cooked at 95 °C. The blanching process was carried out at 95 °C for 2 min. The results showed that, when blanching was used as a pre-treatment for freezing-cooking, a product with fewer physical changes, with a lighter and more intense color (chroma), and with a lower loss of elasticity (Ed) and firmness (F) was obtained.

Keywords : blanching; color; freezing; sweet potato; texture.

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