AIN-93 M (Oriental Yeast Co., Ltd., Tokyo, Japan) was used as the normal diet. A special diet containing 1.0 wt% Si-based agent in AIN-93 M was made as described previously16 (link),20 (link)–22 (link). The Si-based agent reacts with water to continuously generate a high amount of hydrogen in the alkaline intestinal environment. The diet also contains pH-adjusting agents, mainly citric acid, which prevent the Si-based agent from reacting with air moisture during feeding.
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