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Updated: Jul 20, 2026

Catalytic Scavenging of Plant Reactive Oxygen Species In Vivo by Anionic Cerium Oxide Nanoparticles
Published on: August 26, 2018
Structure-activity relationship of neuroprotective and reactive oxygen species scavenging activities for allium
Ji-Myung Kim1, Hyun Joo Chang, Won-Ki Kim
1Korea Food Research Institute, San 46-1, Backhyun, Bundang-gu, Sungnam, Kyonggi-do 463-746, Korea.
Abstract:
The neuroprotective and antioxidative activities of five organosulfur compounds with a thioallyl structure (-S-CH2CH=CH2) were characterized in terms of structure-activity relationships. Among five organosulfur compounds, only S-allyl-L-cysteine (SAC) having the alanyl group (-CH2CH-NH2-COOH) and lacking the oxo (O=) group with in between molecular properties, was effective in protecting cell death induced by both oxygen glucose deprivation and global cerebral ischemia. Conversely, lipophillic organosulfur compounds including diallyl sulfide, diallyl disulfide, and diallyl trisulfide were devoid of in vitro and in vivo neuroprotective activities. Furthermore, a significant correlation was only found between the in vivo neuroprotective activity and the OH- scavenging activity (gamma = 0.55 and p = 0.032) among reactive oxygen species scavenging activities. These results indicate that the presence of the alanyl group and the absence of the oxo group are essential for the manifestation of neuroprotective activity against ischemic insults and scavenging of OH radical, with SAC surfacing as a potent neuroprotectant.
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