Antioxidant and semicarbazide-sensitive amine oxidase inhibitory activities of glucuronic acid hydroxamate

作者：Liu Yuh Hwa; Liang Wen Li; Lee Chi Ching; Tsai Yow Fu; Hou Wen Chi^*

来源：Food Chemistry, 2011, 129(2): 423-428.

DOI：10.1016/j.foodchem.2011.04.094

• Antioxidant activity
• Electron spin resonance (ESR)
• 1-Methoxyl-6-glucuronic acid hydroxamate (GluA-NHOH)

The antioxidant and inhibitory activities of glucuronic acid (GluA) and its synthesized 1-methoxyl-6-glucuronic acid hydroxamate (GluA-NHOH) against semicarbazide-sensitive amine oxidase (SSAO) were investigated. The scavenging activities of GluA-NHOH against 2,2-diphenyl-1-picryl-hydrazyl-hydrate (DPPH) radicals (half-inhibition concentration [IC50], 152 mu M) and hydroxyl radicals (IC50, 70 nM) were determined. The protective activities of GluA-NHOH against hydroxyl radical-mediated calf thymus DNA damage and peroxynitrite-mediated dihydrorhodamine oxidation were also investigated. GluA-NHOH, but not GluA, exhibited close-dependent protective activities. GluA-NHOH, but not GluA, effectively inhibited bovine SSAO activities in a dose-dependent manner, and was further confirmed by AO activity stains on an acrylamide gel. GluA-NHOH showed mixed noncompetitive inhibition of bovine SSAO with respect to benzylamine (substrate) and benzylamine-SSAO (substrate enzyme complex). The V-max' and K-m' values were reduced in the presence of GluA-NHOH (0.04 mM).

• 出版日期2011-11-15