Journal
FOOD HYDROCOLLOIDS
Volume 118, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodhyd.2021.106790
Keywords
Cassava starch; Cassava inner bark; Gelatinized starch; Pre-gelatinization; Themocompression
Categories
Funding
- CAPES (Coordenadoria de Aperfeicoamento de Pessoal para o Ensino Superior)
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)
- FAPERGS (Fundacao de Amparo a Pesquisa do Estado do Rio Grande do Sul) [19/2551-0000708-6]
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This study explored the use of cassava residues in producing foams, finding that pre-gelatinization can enhance the mechanical strength and elongation of biocomposites, while cassava inner bark can be used to create packaging materials with lower water absorption capacity. Additionally, skipping the pre-gelatinization step can increase production speed and reduce costs.
Two residues from the cassava processing industry, cassava inner bark and gelatinized starch, were applied as substitutes for native cassava starch in the development of foams using a thermocompression process (180 ?C, 6 min, 7 MPa). The starchy pastes were also submitted to a pre-gelatinization step in a water bath (80 ?C, 2 min) to evaluate the effect of this step on the properties of the foams. The thickness measurements seemed to be more influenced by the starch amount in the formulations, while the bulk density and the water absorption capacity (WAC) were more influenced by the starch source and its chemical composition. In general, the pregelatinization seemed to have affected more directly the properties of the biocomposites fabricated solely with cassava starch. Moreover, these pre-gelatinized biocomposites presented greater mechanical resistance and higher elongation values. Biocomposites with the incorporation of cassava inner bark presented lower WAC (84% after 90 min), demonstrating their high potential for application as a quick-use packaging for low-moisture foods. These results showed that the non-necessity of the pre-gelatinization step could lead to an increase in biocomposites? fabrication speed due to the elimination of the water bath heating stage, minimizing production costs. Besides that, it is important to highlight the cost reduction related to the use of cassava residues instead of native cassava starch.
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