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<p>To enhance the biological activity of <i>Sargassum fusiforme</i>, a brown algae, polysaccharides were extracted and degraded using two methods: ultrasound-assisted hydrochloric acid (yielding U-SFP) and α-amylase-assisted hydrolysis (yielding M-SFP). A Box-Behnken response surface design (BBRS) was used to optimize the degradation conditions. Structural changes before and after treatment were analyzed, including molecular weight variations during in vitro digestion. The relationship between the structural characteristics and antioxidant activity of the degradation products was established, revealing significant impacts on surface morphology, solubility, crystallinity, and triple-helix structure. The DPPH radical-scavenging activities of U-SFP and M-SFP were 0.106 mg/mL and 0.045 mg/mL, respectively, compared to 0.029 mg/mL for native SFP. Similarly, the ferric reducing power of both U-SFP and M-SFP was significantly higher than that of native SFP. These results demonstrate that controlled degradation enhances the antioxidant capacity of <i>Sargassum fusiforme</i> polysaccharides, highlighting their potential for industrial and biomedical applications.</p>

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Characterization and Antioxidant Activity of Polysaccharides from Sargassum Fusiforme via Different Degradation Methods

  • 期刊论文

  • 发表日期：

    2026年3月6日

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  • Muhammad Amir Ali,
  • Yongchao Jiang,
  • Keyong Tang

摘要

To enhance the biological activity of Sargassum fusiforme, a brown algae, polysaccharides were extracted and degraded using two methods: ultrasound-assisted hydrochloric acid (yielding U-SFP) and α-amylase-assisted hydrolysis (yielding M-SFP). A Box-Behnken response surface design (BBRS) was used to optimize the degradation conditions. Structural changes before and after treatment were analyzed, including molecular weight variations during in vitro digestion. The relationship between the structural characteristics and antioxidant activity of the degradation products was established, revealing significant impacts on surface morphology, solubility, crystallinity, and triple-helix structure. The DPPH radical-scavenging activities of U-SFP and M-SFP were 0.106 mg/mL and 0.045 mg/mL, respectively, compared to 0.029 mg/mL for native SFP. Similarly, the ferric reducing power of both U-SFP and M-SFP was significantly higher than that of native SFP. These results demonstrate that controlled degradation enhances the antioxidant capacity of Sargassum fusiforme polysaccharides, highlighting their potential for industrial and biomedical applications.