Pasta is a popular staple food. Today, there is a trend to consume less processed foods. Products fortification with certain properties, such as antioxidant potential and dietary fiber, represents an added value. Chia is an ancient grain, that contains exceptional proportions of polyunsaturated fatty acids (ω-3/ω-6). After oil extraction, a residue, termed partiallydeoiled chia flour (PDCF), high in protein content, dietary fiber, and phenolic compounds, remains as a by-product. The main goal of this work was to evaluate the nutritional and technological quality of pasta supplemented with PDCF at different proportions (2.5%, 5% and 10%). Parameters such as texture, color, microstructure, protein and fiber content, polyphenol content and antioxidant activity (FRAP and DPPH) were analyzed. A sensory evaluation has been also performed. Our results demonstrate that the addition of PDCF improves the antioxidant capacity with respect to a non-supplemented pasta (0% PDCF). The acceptance of pasta by semi-trained judges was also good. As a concluding remark, the study confirms the feasibility to introduce this food product, and also lead us to consider a profitable application of a by-product of the chia oil extraction process.
Partially defatted chia flour (PDCF) is a byproduct of oil extraction from chia seeds (Salvia hispanica L.). It may be used as an ingredient to improve food products, especially due to its antioxidant properties. In this work, we studied the best screw press extraction conditions that allow preserving the antioxidant properties of PDCF. A central composite design was applied to perform a response surface analysis in order to optimize the oil extraction. The variables considered for optimization were seed moisture content and pressing temperature. Besides the oil quality indicators, the study was focused on the assessment of PDCF properties, including total polyphenol content and antioxidant capacity determined by chemical methods. Our results show that, within the range of screw press conditions evaluated, the chemical quality of the oil and the antioxidant properties of PDCF are both preserved. The best results (highest oil yield and stability) were obtained under a seed moisture content of 10.2% and a pressing temperature of 58.5 °C. In general, our results indicate that screw press methodology can be applied to process chia seeds, using a wide range of conditions, to concurrently produce good quality oil and a PDCF with beneficial properties.
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