Effect of intermittent high-intensity sonication and temperature on barley steeping for malt production

Autor(es)

de Carvalho, Gisandro Reis ^[1] ; Polachini, Tiago Carregari ^{[2, 1]} ; Darros-Barbosa, Roger ^[1] ; Bon, Jose ^[2] ; Telis-Romero, Javier ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ, Inst Biosci Humanities & Exact Sci Ibilce, Food Engn & Technol Dept DETA, UNESP, Campus Sao Jose Do Rio Preto, BR-15054000 Sao Jose Do Rio Preto - Brazil

^[2] Univ Politecn Valencia, Dept Tecnol Alimentos, Grp Anal & Simulat Proc Agroalimentarios ASPA, C Camino Vera S-N, Valencia 46071 - Spain

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF CEREAL SCIENCE; v. 82, p. 138-145, JUL 2018.
• Citações Web of Science: 2

Resumo

Barley malt production comprises three main steps: steeping, germination, and drying. Ultrasound technology has been widely studied to find ways to improve mass transfer in food processes and, consequently, to reduce process times. So, this study evaluated the effect of temperature and the intermittent application of ultrasound on the steps involved in barley hydration. The barley hydration was carried out at 10, 15, 20, and 25 degrees C with and without the application of 0.75 W/mL and 1.5 W/mL of nominal power density at 20 kHz. The ultrasonic energy delivered was measured in the same conditions as the steeping process using a calorimetric method, taking distinct differential volume measurements throughout the hydration medium. The ultrasonic energy delivered presented average values of 51.1 W at 750 W and 84.7 W at 1500 W nominal power. Ultrasound application increased both water uptake rates and equilibrium moisture content as shown by the Peleg and Weibull-ex-ponential model parameters, with the latter showing better adjustment (R-adj(2) > 0.953 and NRMSE < 5%). Applying ultrasound also significantly reduced the time required to achieve the conventional moisture level required for barley germination: 29% and 44% at controlled temperatures of 20 degrees C and 25 degrees C, respectively. (AU)

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• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Regular
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