Results 151 to 160 of about 20,581 (189)

New ent-kaurane diterpenes from the roasted arabica coffee beans and molecular docking to α-glucosidase.

Food Chemistry, 2020
Ten new (1-10) and five known (11-15) ent-kaurane diterpene derivatives were identified from the roasted beans of coffea arabica. Their structures were established by extensive spectroscopic analysis including 1D, 2D NMR (HSQC, HMBC, COSY, and ROESY ...
G. Hu, Xingrong Peng, Ding Dong, Y. Nian, Ya Gao, Xiaoyuan Wang, Defu Hong, M. Qiu   +7 more
semanticscholar   +1 more source

Trypanosomicidal Kaurane Diterpenes fromWedelia paludosa

Planta Medica, 1999
The diterpenes ent-kaur-16-en-19-oic acid, ent-kaur-9(11),16(17)-dien-19-oic acid and 3 alpha-angeloiloxy-ent-kaur-16-en-19-oic acid were identified as trypanosomicidal compounds of the ethanolic extract from the aerial parts of Wedelia paludosa D.C.
R, Batista, E, Chiari, A B, de Oliveira
openaire   +2 more sources

A new kaurane diterpene dimer from Parinari campestris

Fitoterapia, 2005
A new kaurane diterpene dimer, 15-oxozoapatlin-13alpha-yl-10'alpha,16'alpha-dihydroxy-9'alpha-methyl-20'-nor-kauran-19'-oic acid gamma-lactone-17'-oate (1), together with the known 13-hydroxy-15-oxozoapatlin (2), 10alpha,13alpha,16alpha,17-tetrahydroxy-9alpha-methyl-15-oxo-20-nor-kauran-19-oic acid gamma-lactone (3), 2alpha,10alpha,13alpha,16alpha,17 ...
BRACA, ALESSANDRA, A. F. ABDEL RAZIK, J. MENDEZ, MORELLI, IVANO   +3 more
openaire   +3 more sources

HPLC quantitation of kaurane diterpenes in Xylopia species

Fitoterapia, 2001
Xylopia frutescens is a tree native to the Brazilian Amazon whose seeds are rich in kaurenoic acid, a diterpene that showed in vitro activity against Trypanosoma cruzi. Aiming to find out alternative sources for kaurenoic acid, the content of some kaurane diterpenes was evaluated in X. aromatica and X.
A C, de Melo, B B, Cota, A B, de Oliveira, F C, Braga   +3 more
openaire   +2 more sources

Bioactive Kaurane Diterpenes and Coumarins from Fortunella margarita.

ChemInform, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
A M, el-Shafae, M A, Ibrahim
openaire   +2 more sources

Kauranes and related diterpenes from Adenostemma brasilianum

Phytochemistry, 1996
Aerial parts of Adenostemma brasilianum provided a number of new ent-kauranes oxygenated at C-1 and a modified abietane.
Alicia Bardón, Susana Montanaro, César A.N. Catalán, Jesús G. Díaz, Werner Herz   +4 more
openaire   +1 more source

Kaurane and trachylobane diterpenes from Xylopia aethiopica

Phytochemistry, 1994
Abstract Phytochemical investigation of Xylopia aethiopica (Annonaceae) has resulted in the isolation of two novel diterpenes, 15-oxo-(-)-trachyloban-19-oic acid and (-)-kaur-15-en-17-al-19-oic acid. Also encountered were the known compounds 15-hydroxy-(-)-trachyloban-19-oic acid, 15β-hydroxy-(-)-kaur-16-en-19-oic acid (as an inseperable mixture), 15-
George G. Harrigan, Vanderlan da S.Bolzani, A.A. Leslie Gunatilaka, David G.I. Kingston   +3 more
openaire   +1 more source

MALDI-HRMS imaging and HPLC-HRESI-MSn characterisation of kaurane diterpenes in the fruits of Xylopia aethiopica (Dunal) A. Rich (Annonaceae).

Phytochemical Analysis, 2019
INTRODUCTION Kaurane diterpenes, notably xylopic acid, have demonstrated important biological activities including analgesia, anti-oxidant, antimicrobial and cytotoxicity. The fruits of Xylopia aethiopica have been reported to be a rich source of kaurane
James Oppong Kyekyeku, S. Asare-Nkansah, S. Bekoe, Selahaddin Sezgin, R. Adosraku, M. Spiteller   +5 more
semanticscholar   +1 more source

Frutoic acid, a dimeric kaurane diterpene from Xylopia frutescens

Phytochemistry, 1995
Sitosterol and six diterpenes were isolated from green fruit, stem bark and leaves of Xylopia frutescens and characterized as ent-15α-acetoxy-kaur-16-en-19-oic acid (xylopic acid), ent-kaur-16-en-19-oic acid (kaurenoic acid), ent-16β-hydroxy-kaurane, ent-kaur-16-en-19-ol, ent-16β-hydroxy-kauran-19-oic acid and ent-16β,17-dihydroxy-kauran-19-oic acid ...
Jacqueline A. Takahashi, Maria Amélia D. Boaventura, Joaquim de Carvalho Bayma, Oliveira Alaíde B.   +3 more
openaire   +1 more source

Correlation of diterpenes of the (–)-kaurane series and atractyligenin

Australian Journal of Chemistry, 1968
19-Nor-16a- and 19-nor-16ß-(-)-kaurane (11) and (111) have been prepared by unambiguous methods from 16a-( -)-kaurane-3a,l7,19-triol (IV) and (-)-kaur-16-ene-3a,l9-diol (V) and have been identified with samples derived from atractyligenin, thus providing conclusive proof for the skeleton of the latter.
EL Ghisalberti, PR Jefferies, S Passannanti, F Piozzi   +3 more
openaire   +1 more source