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Extrudability and consolidation of CGM and DDGS blends

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Document pages: 11 pages

Abstract: In the past decade, the global biofuel industry has experienced exponential growth. By products such as high protein corn gluten meal (CGM) and high fiber distiller containing soluble dry grain (DDG) are also growing in parallel. CGM has been proved to be suitable as biopolymer; The high fiber content of DDGS reduces its effectiveness, although it is quite cheap. In this study, the processing behavior of CGM and DDGS blends was evaluated and the properties of the extrudates were determined. Urea is used as a denaturant before processing. DDGS  :   CGM ratios of 0, 33, 50, 66 and 100 are processed in a single screw extruder, which uses only dissipative heating. The blends containing DDGS have uneven consolidation, resulting in more dissipative heating. The blends showed multiphasele glass transitions, which is characteristic of mechanically compatible blends. Transmission electron microscopy revealed phase separation on a microscale, although distinct CGM or DDGS phases could not be identified. On a macroscale, optical microscopy suggested that CGM-rich blends were better consolidated, supported by visual observations of a more continuous extrudate formed during extrusion. Future work should aim to also characterize the mechanical properties of these blends to assess their suitability as either bioplastic feedstock or pelletized livestock feed.

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