In this study, flaxseed mucilage was extracted using distilled water as a green solvent and dried by spray-drying and freeze-drying, with and without added maltodextrin (control). The extraction process was optimized using response surface methodology, with seed-to-water ratio (1:30–1:8), temperature (20 °C–90 °C), and time (30–120 min) as variables. Responses included gel yield, dry matter, and °Brix. Optimal extraction conditions (90 °C, 120 min, 1:8 ratio) yielded the highest dry matter and °Brix values, and this mucilage was used in drying experiments. Mucilage solutions with maltodextrin (dextrose equivalents 5–7 and 18–20) and control samples were dried and characterized. Powders were evaluated for moisture content, density, flowability, solubility, particle size, color, viscosity, thermal properties, and microstructure. The freeze-dried control had the lowest moisture content (p < 0.05). Maltodextrin significantly increased bulk density (p < 0.05), with no significant difference obtained associated with dextrose equivalent levels (p > 0.05). Freeze-drying improved solubility, while spray-dried powders had smaller particle sizes compared to freeze-dried powders. Scanning electron microscope images exhibited the presence of larger particles in freeze-dried powders.
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