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In this study, Lallemantia royleana seed mucilage (LRSM) was extracted from whole seeds using hot-water extraction. The structural information (monosaccharide compositions and molecular weight analysis), chemical composition (moisture, protein, ash, fat and carbohydrate), biological activity (antimicrobial, total phenol content and antioxidant activity) and effect LRSM edible coating on population of microbial pathogens (total viable count (TVC), psychrotrophic bacteria, Escherichia coli, Staphylococcus aureus and fungi), chemical changes (thiobarbituric acid, peroxide value and pH) and sensory attributes (color, odor and total acceptability) of the beef slices at 4 °C for 18 days (0, 3, 6, 9, 12, 15 and 18) were determined. The LRSM had 76.74% carbohydrate, 3.86% protein, 9.92% ash and 9.48% moisture. LRSM is a high molecular weight (1.19 × 10⁶ Da) polysaccharide, composed of galactose (36.28 …