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The antioxidative effects of about one hundred methanol extracts of crude drugs were examined on the air oxidation of linoleic acid. Several methanol extracts had a moderately strong antioxidative effect. Especially, the materials of spices and aromatic crude drugs such as Zingiberis Rhizoma, Magnolicae Cortex, and Curcumae Rhizoma possessed a relatively strong activity.
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Toda et al. (1984) studied this question.
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