Spray drying of green corn pulp

• Autor(a) principal: Marques, Gerson Reginaldo
• Data de Publicação: 2014
• Outros Autores: Borges, Soraia Vilela, Botrel, Diego Alvarenga, Costa, Joyce Maria Gomes da, Silva, Eric Keven, Corrêa, Jefferson Luiz Gomes
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFLA
• Texto Completo: http://www.tandfonline.com/doi/abs/10.1080/07373937.2013.873452#.VIBe49LF-dI; http://repositorio.ufla.br/jspui/handle/1/4759
• topic: Drying; Green corn; Morphology; Physical properties

Maize (Zea mays) is a cereal grown in Brazil, and its availability is limited to the harvest season. An alternative processing route is based on the production of green corn powder, which has a longer shelf-life and increased versatility. This study aimed to evaluate the influence of drying conditions on the physical characteristics, size, and morphology of green corn powder. Drying experiments were performed on a spray dryer according to a central composite rotational design to evaluate inlet air temperature, feed flow rate, and pulp concentration. The yield of dried pulp corn had an average value of 36.19%. The following mean values for the physical properties of the powder were measured: solubility of 94.37 g/100 g, wettability of 128.05 seconds, moisture content of 1.97%, water activity of 0.13, density of 0.79 g/mL, and a particle diameter of 31.02 µm. The powder was also yellow with less intensity, and the particle surface was smooth at higher temperatures and had a tendency to form agglomerates. The estimated optimal conditions for spray drying were 48% (w/w) pulp concentration, 172°C inlet air temperature, and feed flow rate of 0.56 L/h.