Molecules 2009, 14(1), 266-272; doi:10.3390/molecules14010266
Article

Isolation of Betulinic Acid, its Methyl Ester and Guaiane Sesquiterpenoids with Protein Tyrosine Phosphatase 1B Inhibitory Activity from the Roots of Saussurea lappa C.B.Clarke

1, 1,* email, 1, 1,* email, 2, 2 and 2,* email
Received: 5 December 2008; in revised form: 26 December 2008 / Accepted: 4 January 2009 / Published: 8 January 2009
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Activity-guided fractionation of a MeOH extract of the roots of Saussurea lappa C.B.Clarke (Compositae), using an in vitro protein tyrosine phosphatase 1B (PTP1B) inhibition assay, led to the isolation of four active constituents: betulinic acid (1), betulinic acid methyl ester (2), mokko lactone (3) and dehydrocostuslactone (4), along with nine inactive compounds. Our findings indicate that betulinic acid (1) and its methyl ester 2, as well as the two guaiane sesquiterpenoids 3 and 4 are potential lead moieties for the development of new PTP1B inhibitors.
Keywords: Protein tyrosine phosphatase 1B; Saussurea lappa C.B.Clarke; Betulinic acid; Betulinic acid methyl ester; Mokko lactone; Dehydrocostuslactone
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MDPI and ACS Style

Choi, J.Y.; Na, M.; Hyun Hwang, I.; Ho Lee, S.; Young Bae, E.; Yeon Kim, B.; Seog Ahn, J. Isolation of Betulinic Acid, its Methyl Ester and Guaiane Sesquiterpenoids with Protein Tyrosine Phosphatase 1B Inhibitory Activity from the Roots of Saussurea lappa C.B.Clarke. Molecules 2009, 14, 266-272.

AMA Style

Choi JY, Na M, Hyun Hwang I, Ho Lee S, Young Bae E, Yeon Kim B, Seog Ahn J. Isolation of Betulinic Acid, its Methyl Ester and Guaiane Sesquiterpenoids with Protein Tyrosine Phosphatase 1B Inhibitory Activity from the Roots of Saussurea lappa C.B.Clarke. Molecules. 2009; 14(1):266-272.

Chicago/Turabian Style

Choi, Ji Y.; Na, MinKyun; Hyun Hwang, In; Ho Lee, Seung; Young Bae, Eun; Yeon Kim, Bo; Seog Ahn, Jong. 2009. "Isolation of Betulinic Acid, its Methyl Ester and Guaiane Sesquiterpenoids with Protein Tyrosine Phosphatase 1B Inhibitory Activity from the Roots of Saussurea lappa C.B.Clarke." Molecules 14, no. 1: 266-272.

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