Mucilage refers to a complex mixture of high-molecular-weight polysaccharides, primarily composed of arabinose, galactose, rhamnose, and galacturonic acid units, extracted from various plant sources such as seeds (e.g., flax, psyllium), roots, and bark. It functions as a hydrocolloid with excellent water-binding capacity, forming viscous gels or solutions that act as demulcents, thickeners, and stabilizers in food and pharmaceutical applications. Chemically, it consists of branched chains with both neutral and acidic sugar residues, often including uronic acids that contribute to its polyelectrolyte behavior. In food science, mucilages from sources like okra or aloe are valued for their texture-modifying properties and potential prebiotic effects. They are generally stable under neutral pH but may degrade under strong acidic or alkaline conditions or high temperatures. Mucilages play roles in plant physiology for water retention and seed germination.