Phytochemistry of cimicifugic acids and associated bases in Cimicifuga racemosa root extracts

INTRODUCTION: Earlier studies reported serotonergic activity for cimicifugic acids (CA) isolated from Cimicifuga racemosa. The discovery of strongly basic alkaloids, cimipronidines, from the active extract partition and evaluation of previously employed work-up procedures has led to the hypothesis of strong acid/base association in the extract. OBJECTIVE: Re-isolation of the CAs was desired to permit further detailed studies. Based on the acid/base association hypothesis, a new separation scheme of the active partition was required, which separates acids from associated bases. METHODOLOGY: A new 5-HT(7) bioassay guided work-up procedure was developed that concentrates activity into one partition. The latter was subjected to a new two-step centrifugal partitioning chromatography (CPC) method, which applies pH zone refinement gradient (pHZR CPC) to dissociate the acid/base complexes. The resulting CA fraction was subjected to a second CPC step. Fractions and compounds were monitored by (1)H NMR using a structure-based spin-pattern analysis facilitating dereplication of the known acids. Bioassay results were obtained for the pHZR CPC fractions and for purified CAs. RESULTS: A new CA was characterised. While none of the pure CAs was active, the serotonergic activity was concentrated in a single pHZR CPC fraction, which was subsequently shown to contain low levels of the potent 5-HT(7) ligand, N(omega)-methylserotonin. CONCLUSION: This study shows that CAs are not responsible for serotonergic activity in black cohosh. New phytochemical methodology (pHZR CPC) and a sensitive dereplication method (LC-MS) led to the identification of N(omega)-methylserotonin as serotonergic active principle.

Gödecke, Tanja
Nikolic, Dejan
Lankin, David C.
Chen, Shao-Nong
Powell, Sharla L.
Dietz, Birgit
Bolton, Judy L.
van Breemen, Richard B.
Farnsworth, Norman R.
Pauli, Guido F.
Item Type: 
Journal Article
Publication Title: 
Phytochemical analysis: PCA
Journal Abbreviation: 
Phytochem Anal
Publication Date: 
2009 Mar-Apr
Publication Year: 
Library Catalog: 
NCBI Published Medical (?)
PMID: 19140115 PMCID: PMC2715282

Turabian/Chicago Citation

Tanja Gödecke, Dejan Nikolic, David C. Lankin, Shao-Nong Chen, Sharla L. Powell, Birgit Dietz, Judy L. Bolton, Richard B. van Breemen, Norman R. Farnsworth and Guido F. Pauli. 2009 Mar-Apr. "Phytochemistry of cimicifugic acids and associated bases in Cimicifuga racemosa root extracts." Phytochemical analysis: PCA 20: 2: 120-133. 10.1002/pca.1106.

Wikipedia Citation

<ref> {{Cite journal | doi = 10.1002/pca.1106 | issn = 1099-1565 | volume = 20 | pages = 120-133 | last = Gödecke | first = Tanja | coauthors = Nikolic, Dejan, Lankin, David C., Chen, Shao-Nong, Powell, Sharla L., Dietz, Birgit, Bolton, Judy L., van Breemen, Richard B., Farnsworth, Norman R., Pauli, Guido F. | title = Phytochemistry of cimicifugic acids and associated bases in Cimicifuga racemosa root extracts | journal = Phytochemical analysis: PCA | date = 2009 Mar-Apr | pmid = | pmc = }} </ref>