This research was intended to investigate the structural feature, antioxidative activity and interaction with β-lactoglobulin (β-lg) of a polysaccharide (P) isolated from Borassus flabellifer fruit thru aqueous extraction, protein elimination and chromatographic techniques. Polysaccharide P (molecular weight: 21,000 g mol^-1) was constituted of arabinose, galactose, glucose, and rhamnose in a 50:24:20:6 M ratio alongside 9% (w/w) galacturonic acid. It encompassed a petite backbone entailing galacturonopyranosyl and rhamnopyranosyl units substituted with sizable side chains comprising of arabinofuranosyl, galactopyranosyl and esterified coumaric acid (CA) residues. Various series of oligosaccharides including (i) Gal_1,2,4-9Ac_5-29, (ii) Ara_2-3Ac_6-8, (iii) Gal₃Ara_1-3Ac_13-17, (iv) Gal_4-6Ara₂Ac_18-24, (v) Gal₆Ara₁Ac₂₂ and (vi) Gal₁Ara₂CA₁Ac₇ and Gal₁Ara₃CA₁Ac₉ epitomizing polysaccharide structure were generated and characterised. Fraction P exhibited dose-dependent antioxidant activity and possessed a strong β-lactoglobulin binding capability. Accordingly, B. flabellifer fruit offers an antioxidative polysaccharide having novel structure that can associate with β-lg and, hence, useful in formulating novel food possessing adjustable composition.

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