Results 121 to 130 of about 780 (161)

The Role of Pentacyclic Triterpenoids in the Allelopathic Effects of Alstonia scholaris

Journal of Chemical Ecology, 2014
Alstonia scholaris is a tropical evergreen tree native to South and Southeast Asia. Alstonia forests frequently lack understory species. However, potential mechanisms-particularly the allelochemicals involved-remain unclear. In the present study, we identified allelochemicals of A.
Chao-Min Wang, Chang-Hung Chou, Wang Chao-Min   +2 more
exaly   +3 more sources

Alkaloids from Alstonia scholaris

Phytochemistry, 1997
Abstract Three new indole alkaloids, nareline ethyl ether, 5- epi -nareline ethyl ether and scholarine- N (4)-oxide, in addition to nareline methyl ether, picrinine and scholaricine were isolated from the leaf extract of Alstonia scholaris . © 1997 Elsevier Science Ltd.
Kam Toh-Seok, Nyeoh Kok-Tih, Sim Kooi-Mow, K. Yoganathan   +3 more
openaire   +3 more sources

Antibacterial activity of Alstonia scholaris and Leea tetramera

Fitoterapia, 2003
The crude methanolic extracts of the leaves, stem and root barks of Alstonia scholaris and Leea tetramera on partitioning (petrol, dichloromethane, ethyl acetate, butanol) gave fractions exhibiting improved and broader spectrum of antibacterial activity. Especially the butanol fractions of A. scholaris and the root bark of L. tetramera.
M R, Khan, A D, Omoloso, M, Kihara
openaire   +2 more sources

Mechanisms underlying the antihypertensive effect of Alstonia scholaris

Journal of Ethnopharmacology, 2015
Alstonia scholaris has a long history of use in the Ayurveda traditional treatment of various ailments including hypertension. We have reported the blood pressure lowering activity of the extract of A. scholaris. The following research aim to delineate the pharmacological mechanism involve in the antihypertensive action.Vasorelaxant effect of the n ...
Idris, Bello, Nasiba Salisu, Usman, Roziahanim, Mahmud, Mohd Zaini, Asmawi   +3 more
openaire   +2 more sources

Indole Alkaloids from the Leaves of Philippine Alstonia scholaris.

ChemInform, 2005
The first seco-uleine alkaloids, manilamine (1) (18-hydroxy-19,20-dehydro-7,21-seco-uleine) and N4-methyl angustilobine B (2), were isolated from the (pH 5) alkaloid extract of Philippine Alstonia scholaris leaves together with the known indole alkaloids 19,20-(E)-vallesamine (3), angustilobine B N4-oxide (4), 20(S)-tubotaiwine (5), and 6,7-seco ...
Allan Patrick G, Macabeo, Karsten, Krohn, Dietmar, Gehle, Roger W, Read, Joseph J, Brophy, Geoffrey A, Cordell, Scott G, Franzblau, Alicia M, Aguinaldo   +7 more
openaire   +2 more sources

Scholarine: An indole alkaloid of Alstonia scholaris

Phytochemistry, 1981
Abstract A new alkaloid designated scholarine was isolated from the leaves of Alstonia scholaris . It was (±) 12-methoxyechitamidine as determined by chemical and spectroscopic investigations.
Avijit Banerji, Arup K. Siddhanta
openaire   +1 more source

Indole alkaloids from Alstonia scholaris

Phytochemistry, 1987
Abstract A new indole alkaloid, alstonamine and a sitsirikine type indole alkaloid, rhazimanine, have been isolated from the leaves of Alstonia scholaris .
null Atta-Ur-Rahman, K.A. Alvi
openaire   +1 more source

Scholaricine, an alkaloid from alstonia scholaris

Phytochemistry, 1985
Abstract A new alkaloid, scholaricine, has been isolated to which structure 2 (demethylscholarine) has been assigned.
A. Atta-Ur-Rahman, M. Asif, M. Ghazala, J. Fatima, K.A. Alvi   +4 more
openaire   +1 more source

Evaluation of Alstonia scholaris leaves for broncho-vasodilatory activity

Journal of Ethnopharmacology, 2005
The present study demonstrates that the ethanol extract of Alstonia scholaris (Apocynaceae) leaves induced pronounced bronchodilatory activity in anaesthetized rats with the probable involvement of prostaglandins. However, in vitro preparations of guinea-pig trachea did not confirm this property, indicating that bronchodilation is not due to the direct
Shabana, Channa, Ahsana, Dar, Shakeel, Ahmed, , Atta-ur-Rahman   +3 more
openaire   +2 more sources