Efficient extraction, physiochemical, rheological properties, and antioxidant activities of polysaccharides from Armeniaca vulgaris Lam

Abstract

To improve the extraction efficiency of polysaccharides from Armeniaca vulgaris Lam (APP) by microbial fermentation assisted extraction (MFE), the optimal extraction conditions were optimized as follows: fermentation time, 8 h; rotation speed, 145 r/min; inoculation amount, 8%, and fermentation temperature, 31 °C. When compared to hot water extraction (HWE), the yield of APP increased by 79.77%. Meanwhile, the physical and chemical properties, structural characteristic, rheological, and antioxidant properties of polysaccharides obtained using hot water extraction (APP-H) and microbial fermentation assisted extraction (APP-F) were investigated and compared. These findings revealed that two of the polysaccharides are pectin polysaccharides. APP-F had a lower molecular weight. APP-H and APP-F had the same monosaccharide composition, but different ratio. Furthermore, rheological properties revealed that two polysaccharides had extremely high viscosities. At low concentrations and high frequencies, APP-F had a predominant storage modulus, whereas APP-H had the opposite. Finally, the antioxidant activities of two polysaccharides revealed that APP had a significant difference and APP-F had the highest hydroxyl radical scavenging effect. As a result, microbial fermentation assisted extraction could be an efficient method of extracting APP.