Rice starch-alginate systems gelatinised by high hydrostatic pressure (HHP) as dysphagia-oriented matrices

Pedro Rivero-Ramos, Maria Ines Valdez, Teresa Sanz, Raquel Garzon, Cristina M. Rosell, Maria Benlloch-Tinoco, Dolores Rodrigo*

*Corresponding author for this work

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The rheological, mechanical and structural properties of conventional and waxy rice starch-alginate composite gels formed by heat (90 ± 1 °C, 20 min) and high hydrostatic pressure (500 MPa at 20 ± 3 °C for 20 min) were investigated to explore the feasibility of these matrices as novel dysphagia-oriented foods. Amylose containing rice starch composite samples processed by HHP exhibited a rheological pattern typical of weaker networks with more fluid-like behaviour among all formulations (G’ = 300–1200 Pa, tan δ = 0.10–0.20), which was considered favourable for dysphagia patients. HHP gelatinisation led to marked short-term retrogradation of normal starch gels, as reflected by the significantly higher values of gel firmness (72 ± 4 g) (p < 0.05). However, this phenomenon was significantly attenuated by the presence of alginate (10–15 g) (p < 0.05). The texture profile analysis (TPA) parameters of all formulations were within the range recommended for texture-modified food products for dysphagia patients. HHP treatment indicated a positive effect on the long-range and short-range ordered structure of the composite gels, which was further confirmed by the SEM micrographs. The international dysphagia diet standardization initiative (IDDSI) tests indicated that only amylose-containing starch-alginate composites produced by HHP could be classified as level 5. These results provide insights into the potential benefits of utilising HHP to produce starch-alginate composites for the development of the novel soft gel-type dysphagia food matrices.

Original languageEnglish
Article number109793
Number of pages11
JournalFood Hydrocolloids
Early online date27 Jan 2024
Publication statusE-pub ahead of print - 27 Jan 2024

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