Work

Effects of ultrasound-assisted multienzymolysis combined with gallic acid grafting or acetylation on the structural and lipid adsorption-relative properties of Ziziphus jujuba residue dietary fibre

Year: 2025

Type: article

Abstract: Although Ziziphus jujuba juice residue is rich in fibre and polyphenols, it has relatively poor functionalities and limited application in food industry. This study investigates the effects of ultrasound-assisted multienzymatic treatment combined with acetylation or gallic acid grafting on the structural characteristics and lipid adsorption-relative properties of Ziziphus jujuba juice residue dietary fibre (ZJJRDF). More porous or fragmented microstructure, lower crystallinity and lightness were observed in ZJJRDF upon performing ultrasound-assisted multienzymatic treatment combined with acetylation or gallic acid grafting. The combination of ultrasound-assisted multienzymatic treatment and gallic acid grafting is the most effective at increasing the soluble fibre and polyphenol contents, oil-holding capacity (2.23 g∙g ‒1 ), hydrophobicity (2,553), emulsifying activity (103 m 2 ∙g ‒1 ), emulsion stability (89.7%) and cholesterol-sorption ability (43.5 mg∙g ‒1 ) of ZJJRDF. Alternatively, the largest surface area (148 m 2 ∙kg ‒1 ) as well as the highest sodium cholate sorption ability (79.2 mg∙g ‒1 ) and pancrelipase-inhibitory activity (28.5%) were observed in ZJJRDF modified via ultrasound-assisted multienzymatic treatment combined with acetylation. Therefore, ultrasound-assisted enzymolysis combined with gallic acid grafting or acetylation are both effective in improving the lipid adsorption-relative properties of ZJJRDF. However, the special mechanisms of these composite methods warrant further investigation. • Ultrasound, enzymolysis and acetylation increased hydrophobicity of ZJJRDF • Ultrasound, enzymolysis, gallic acid grafting increased total phenols of ZJJRDF • Ultrasound, enzymolysis, gallic acid grafting enhanced ZJJRDF’s emulsion properties • Ultrasound, enzymolysis and acetylation improved ZJJRDF’s bile sorption ability • Ultrasound, enzymolysis, acetylation enhanced the pancrelipase-inhibitory ability

Source: LWT

DOI: 10.1016/j.lwt.2025.118789