Modified citrus pectins by UV/H2O2 oxidation at acidic and basic conditions: Structures and in vitro anti-inflammatory, anti-proliferative activities

作者：Cao, Jing; Yang, Jian; Wang, Zhaomei^*; Lu, Muwen; Yue, Kaiting

来源：Carbohydrate Polymers, 2020, 247: 116742.

DOI：10.1016/j.carbpol.2020.116742

• Modified citrus pectin
• UV/H2O2 oxidation
• Alkaline and acidic pH
• Anti-inflammation
• Anti-proliferation

Two modified citrus pectins, MCP4 and MCP10, were prepared by UV/H2O2 treatment at pH 4 and pH 10, respectively, and their structures were characterized. MCP10 had a rhamnogalacturonan-I (RG-I) enriched backbone with a high degree of branching (DB similar to 61 %) and a low methoxylation degree (24 %). MCP4 had a homogalacturonan enriched backbone with a high degree (46 %) of methoxylation and a low DB (similar to 41 %) of RG-I branches. MCP10 exhibited a higher anti-inflammatory activity than MCP4 in suppressing the NF-kappa B expression and the production of pro-inflammatory factors TNF-alpha and IL-1 beta of THP-1 cells stimulated by lipopolysaccharide. MCP10 also showed a stronger inhibitory effect on Caco-2 cell proliferation. The stronger bioactivities of MCP10 may be attributable to the abundant branches and the proper length of terminal galactan residues attached to the RG-I domain.

• 单位
  5; 华南农业大学