Akiko Okawa

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The C-26 amino group of steroidal alkaloids, such as tomatine, is introduced during an early step of their biosynthesis from cholesterol. In the present study, the mechanism of C-26 amination was reinvestigated by administering stable isotope labeled compounds, such as (26,26,26,27,27,27-(2)H6)cholesterol during biosynthesis of tomatine, solanine and(More)
The C-26 amino group of tomatine, a representative Solanaceae steroidal alkaloid, is introduced in an early step of its biosynthesis from cholesterol. We recently proposed a transamination mechanism for the C-26 amination as opposed to the previously proposed mechanism involving a nitrogen nucleophilic displacement. In the present study, a deuterium labeled(More)
Chemical investigation of the glandular trichome exudate of Verbascum blattaria f. erubescens (Scrophulariaceae) led to the isolation of four new glycerides, 1-O-acetyl-2-O-[(R)-3-hydroxytetradecanoyl]-sn-glycerol, 1-O-acetyl-2-O-[(R)-3-hydroxyhexadecanoyl]-sn-glycerol, 2-O-[(R)-3-hydroxytetradecanoyl]glycerol and 2-O-[(R)-3-hydroxyhexadecanoyl]glycerol.(More)
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