Steroids from herbs of Reineckia carnea and their anticomplement activities
摘要:
A new polyhydroxylated pregnane, named l beta,2 beta,3 beta,4 beta,5 beta,6 beta-hexolhydroxy-pregn-16-en-20-one (1), along with nine known (2-10) steroidal saponins were isolated from the whole plant of Reineckia carnea. Structure elucidations of all compounds were established by interpretation of their NMR spectral data, HR-ESI-MS and comparing with literatures. In addition, these compounds were evaluated with anticomplement activity. The result showed that compound 1 exhibited anticomplement effects with the CH50 values of 0.043 mg/mL, but saponins (2-10) showed no inhibition. Interestingly, hydrolysis of steroidal saponins (2-10) resulted in its aglycones (2a-10a) correspondingly which showed anticomplement activity with the CH50 values of 0.049-0.156 mg/mL.[GRAPHICS].
Five steroidal compounds were isolated from the dried underground part of Aspidistra elatior BLUME (Liliaceae), and four of them were elucidated to be aspidistrin (diosgenin 3-O-β-lycotetraoside), proto-aspidistrin, methyl proto-aspidistrin, and 1β, 2β, 3β, 4β, 5β-pentahydroxyspirost-25 (27)-ene (Δ25 (27)-pentologenin or Δ25 (27)-neopentologenin), on the basis of physical and chemical investigations. The remaining steroidal compound is suggested to be a new spirostanol compound.
A new polyhydroxylated pregnane, named l beta,2 beta,3 beta,4 beta,5 beta,6 beta-hexolhydroxy-pregn-16-en-20-one (1), along with nine known (2-10) steroidal saponins were isolated from the whole plant of Reineckia carnea. Structure elucidations of all compounds were established by interpretation of their NMR spectral data, HR-ESI-MS and comparing with literatures. In addition, these compounds were evaluated with anticomplement activity. The result showed that compound 1 exhibited anticomplement effects with the CH50 values of 0.043 mg/mL, but saponins (2-10) showed no inhibition. Interestingly, hydrolysis of steroidal saponins (2-10) resulted in its aglycones (2a-10a) correspondingly which showed anticomplement activity with the CH50 values of 0.049-0.156 mg/mL.[GRAPHICS].