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Idesia (Arica)

versión On-line ISSN 0718-3429

Resumen

SOARES WENNECK, Gustavo et al. Drying process: effects of temperature on the oil of different sunflower genotypes. Idesia [online]. 2020, vol.38, n.1, pp.93-98. ISSN 0718-3429.  http://dx.doi.org/10.4067/S0718-34292020000100093.

Drying is a critical stage in postharvest grain processing and alters its structural and physiological characteristics, affecting the quality of the final product. This study aimed to assess the effect of drying sunflower achenes on oil content. A randomized block design was used, in a 5 x 4 factorial scheme consisting of four drying treatments (35, 40, 50 and 70 °C) in a forced-air dryer and one under uncontrolled conditions (drying terrace), with four repetitions. Oil content and acid value were analyzed in oil extracted from the achenes of 13 sunflower genotypes grown under the same conditions, whose moisture content declined from 30 to 8 % (dry basic) under different drying temperatures. Data were analyzed using the Scott-Knott test (p < 0.05). Drying under controlled conditions at high temperatures (50 and 70 0C) reduced the achene oil content for all the genotypes assessed, with an acid value close to (50 °C) or above (70 °C) the maximum legal limit. Uncontrolled drying and controlled low temperatures (35 and 40 oQ showed no significant variations in oil content or acid value.

Palabras clave : Heat stress; Helianthus annuus L.; postharvest; quality; yield.

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