Phytochemical Studies of Amoora cucullata

1970 ◽  
Vol 4 (1) ◽  
Author(s):  
Mohammad S Rahman ◽  
Rasheduzzaman Chowdhury ◽  
Bilkis Begum ◽  
Khondaker M Rahman ◽  
Mohammad A Rashid
Keyword(s):  
Key Words ◽  
Caffeic Acid ◽  
Betulinic Acid ◽  
Full Text ◽  
High Field ◽  
Stem Bark ◽  
Spectroscopic Studies ◽  
Hexane Extract ◽  
First Report ◽  
Phytochemical Studies

Five compounds were isolated from a hexane extract of the stem bark of Amoora cucullata. The structures of the isolated compounds were established as fridelin (1), stigmasterol, β-sitosterol, betulinic acid (2) and caffeic acid (3) by extensive spectroscopic studies, including high field NMR and MS analyses. This is the first report of occurrence of these compounds from A. cucullata. Key words: Amoora cucullata, Meliaceae, Fridelin, Betulinic acid, Caffeic acid, β-Sitosterol, Stigmasterol Dhaka Univ. J. Pharm. Sci. Vol.4(1) 2005 The full text is of this article is available at the Dhaka Univ. J. Pharm. Sci. website

Oleanane Glycosides from Eclipta prostrata

1970 ◽  
Vol 4 (2) ◽  
Author(s):  
Mohammad S Rahman ◽  
Rasheduzzaman Chowdhury ◽  
Chodhury M Hasan ◽  
Mohammad A Rashid
Keyword(s):  
Key Words ◽  
13C Nmr ◽  
Full Text ◽  
High Field ◽  
Stem Bark ◽  
Spectroscopic Studies ◽  
Hexane Extract ◽  
Nmr Data ◽  
Eclipta Prostrata ◽  
First Time

Two oleanane-type glycosides eclalbasaponin II (1) and eclalbasaponin I (2) along with the ubiquitous steroid, stigmasterol were isolated from an n-hexane extract of the stem bark of Eclipta prostrata. The structures of the isolated compounds were confirmed by extensive spectroscopic studies, notably high field NMR and MS. The 13C NMR data of the parent saponins 1 and 2 are reported here for the first time. Key words: Eclipta prostrata, Compositae, Oleanane glycoside, Eclalbasaponin I, Eclalbasaponin II. Dhaka Univ. J. Pharm. Sci. Vol.4(2) 2005 The full text is of this article is available at the Dhaka Univ. J. Pharm. Sci. website

scholarly journals Secondary Metabolites from Sterespermum chelonoides

1970 ◽  
Vol 4 (1) ◽  
Author(s):  
Mohammad R Haque ◽  
Khondaker M Rahman ◽  
Bilkis Begum ◽  
Choudhury M Hasan ◽  
Mohammad A Rashid
Keyword(s):  
Secondary Metabolites ◽  
Key Words ◽  
Full Text ◽  
High Field ◽  
Methanolic Extract ◽  
Stem Bark ◽  
Spectroscopic Studies ◽  
First Report

Five compounds namely, sterekunthal B (1), sterequinone C (2), p-hydroxybenzaldehyde (3), p-hydroxyphenylmethyl ketone (4) and stigmasterol (5) were isolated from methanolic extract of the stem bark of Stereospermum chelonoides. The structures of compounds 1-5 were established by extensive spectroscopic studies, notably high field NMR and MS. This is the first report of occurrence of 1-5 from Stereospermum chelonoides. Key words: Stereospermum chelonoides, Bignoniaceae, Sterekunthal B, Sterequinone C Dhaka Univ. J. Pharm. Sci. Vol.4(1) 2005 The full text is of this article is available at the Dhaka Univ. J. Pharm. Sci. website

scholarly journals Terpenoids and Coumarin from Bursera serrata Wall.

1970 ◽  
Vol 8 (2) ◽  
pp. 107-110 ◽  
Author(s):  
Kulsum Ara ◽  
Mohammad S Rahman ◽  
AHMM Rahman ◽  
Choudhury M Hasan ◽  
Mohammad A Rashid
Keyword(s):  
Antimicrobial Activity ◽  
Petroleum Ether ◽  
Key Words ◽  
Plant Species ◽  
Stem Bark ◽  
Spectroscopic Studies ◽  
Published Data ◽  
First Report

Two terpenoids, β-amyrin (1) and β-sitostenone (2) and a coumarin, scopoletin (3) were isolated from petroleum ether and dichloromethane soluble extracts of the stem bark of Bursera serrata Wall. The structures of the isolated compounds 1-3 were established by extensive spectroscopic studies as well as by comparison with published data. Although compounds 1-3 have been isolated from various plant species previously, this is the first report of the occurrence of these compounds from B. serrata. The crude extractives exhibited weak antimicrobial activity and cytotoxicity. Key words: Bursera serrata; Burseraceae; β-amyrin; β-sitostenone; scopoletin; antimicrobial; cytotoxicity   DOI: 10.3329/dujps.v8i2.6023 Dhaka Univ. J. Pharm. Sci. 8(2): 107-110, 2009 (December)

scholarly journals 7-Methoxy-8-Prenylated Coumarins from Murraya koenigii (Linn.) Spreng.

2017 ◽  
Vol 15 (2) ◽  
pp. 155-159 ◽  
Author(s):  
Md Mubarak Hossain ◽  
Faiza Tahia ◽  
Md Abdullah Al Mansur ◽  
Mohammad A Rashid
Keyword(s):  
High Field ◽  
Methanol Extract ◽  
Stem Bark ◽  
Spectroscopic Studies ◽  
Published Data ◽  
Coumarin Derivatives ◽  
Murraya Koenigii ◽  
First Report ◽  
Meranzin Hydrate

Four coumarin derivatives were isolated from the methanol extract of stem bark of Murraya koenigii (Linn.) Spreng. Extensive spectroscopic studies, including high field NMR analyses allowed to identify these compounds as meranzin hydrate (1), epoxyosthol (2), isomeranzin (3) and murracarpin (4). The identity of the compounds was confirmed by comparison with published data as well as co-TLC with authentic samples. This is the first report of occurrence of meranzin hydrate (1), epoxyosthol (2) and isomeranzin (3) from M. koenigii.Dhaka Univ. J. Pharm. Sci. 15(2): 155-159, 2016 (December)

Phytochemical Studies on Alstonia scholaris

2010 ◽  
Vol 65 (2) ◽  
pp. 203-210 ◽  
Author(s):  
Nighat Sultana ◽  
Muhammad Saleem
Keyword(s):  
Ursolic Acid ◽  
Spectroscopic Studies ◽  
First Report ◽  
Alstonia Scholaris ◽  
Phytochemical Studies

Reinvestigation of the flowers of Alstonia scholaris of Pakistan origin have resulted in the isolation of three new triterpenoids, two of the ursane type, 3β -acetate-24-nor-urs-4,12-diene ester triterpene (1) and 3β -hydroxy-24-nor-urs-4,12,28-triene triterpene (2), and one of the oleanane type, 3,28-β - diacetoxy-5-olea-triterpene (3), together with two known triterpenes,α-amyrin acetate (4) and ursolic acid (5). This is the first report of the isolation of 4 and 5 from the flower part of this species. The structures of 1 - 5 were elucidated with the aid of extensive NMR-spectroscopic studies.

scholarly journals Triterpenoids from the Stem Bark of Crataeva nurvala

1970 ◽  
Vol 7 (1) ◽  
pp. 71-74 ◽  
Author(s):  
Md Enamul Haque ◽  
Md Nahidul Islam ◽  
Dipankar Das Gupta ◽  
Mahbub Hossain ◽  
Hossain Uddin Shekhar ◽  
...  
Keyword(s):  
Ethyl Acetate ◽  
Key Words ◽  
Silica Gel ◽  
1H Nmr ◽  
13C Nmr ◽  
Ethyl Acetate Extract ◽  
Stem Bark ◽  
First Report ◽  
Spectroscopic Analyses ◽  
Phytochemical Investigation

Two triterpenoids, phragmalin triacetate (1) and lupeol (2) were isolated from an ethyl acetate extract of the stem bark of Crataeva nurvala (Capparidaceae) by repeated chromatography over silica gel. The structures of these compounds were determined by spectroscopic analyses (UV, IR, 1H NMR, 13C NMR and EIMS). This is the first report of the systematic phytochemical investigation and the presence of these compounds 1 and 2 from this plant. Key words: Crataeva, Capparidaceae, Phragmalin triacetate and Lupeol.  DOI = 10.3329/dujps.v7i1.1221 Dhaka Univ. J. Pharm. Sci. 7(1): 71-74, 2008 (June)

scholarly journals A Novel Iridoid from Plumeria Obtusa

2008 ◽  
Vol 3 (2) ◽  
pp. 1934578X0800300
Author(s):  
Firdous Imran Ali ◽  
Imran Ali Hashmi ◽  
Bina Shaheen Siddiqui
Keyword(s):  
Natural Product ◽  
Stem Bark ◽  
Spectroscopic Studies ◽  
Chemical Transformations ◽  
Compound Identification ◽  
Synthetic Compound ◽  
First Report ◽  
Isolation And Characterization

Phytochemical investigations of fresh leaves and stem bark of Plumeria obtusa Linn. have led to the isolation and characterization of a new iridoid, p-methoxy- E-cinnamoyloxy plumieride (1), to which the trivial name champalinin has been assigned, and a triterpene lactone, 3β-hydroxy-urs-12-one-13β,28-olide (2). This is the first report of compound 2 as a natural product, although it has been reported earlier as a synthetic compound. Identification of these compounds was achieved through spectroscopic studies and chemical transformations.

scholarly journals Triterpenoids from the Stem Bark of Avicennia officinalis

1970 ◽  
Vol 5 (1) ◽  
pp. 53-57 ◽  
Author(s):  
Md. Enamul Haque ◽  
Hussain Uddin Shekhar ◽  
Akim Uddin Mohamad ◽  
Hafizur Rahman ◽  
AKM Mydul Islam ◽  
...  
Keyword(s):  
Thin Layer ◽  
Betulinic Acid ◽  
Full Text ◽  
Spectroscopic Analysis ◽  
Ethyl Acetate Extract ◽  
Preparative Thin Layer Chromatography ◽  
Stem Bark ◽  
Phytochemical Investigation ◽  
Avicennia Officinalis ◽  
Layer Chromatography

The triterpinoids, betulinic acid, lupeol and betulinaldehyde, were isolated from the ethyl acetate extract of the stem bark of Avicennia officinalis (Avicenniaceae) by a combination of column and preparative thin-layer chromatography over silica gel. The structures of these compounds were determined by spectroscopic analysis (UV, IR, 1H NMR, 13CNMR and EIMS). This is the first report of a systematic phytochemical investigation and the presence of these triterpoids from this plant. Key words: Triterpenoid, Avicenniaceae, Betulinic acid, Lupeol and Betulinaldehyde Dhaka Univ. J. Pharm. Sci. Vol.5(1-2) 2006 The full text is of this article is available at the Dhaka Univ. J. Pharm. Sci. website

Steriod and Triterpenoid from Anogeissus latifolia

1970 ◽  
Vol 6 (1) ◽  
pp. 47-50 ◽  
Author(s):  
Mohammad S Rahman ◽  
Mohammad Z Rahman ◽  
ABM Ahad Uddin ◽  
Mohammad A Rashid
Keyword(s):  
Ethyl Acetate ◽  
Key Words ◽  
Inhibitory Activity ◽  
Full Text ◽  
Brine Shrimp ◽  
Microbial Growth ◽  
Ethyl Acetate Extract ◽  
Stem Bark ◽  
Disc Diffusion ◽  
Antimicrobial Screening

3-?-hydroxy-28-acetyltaraxaren (1) and ?-sitosterol (2) were isolated from an ethyl acetate extract of the stem bark of Anogeissus latifolia. The ethyl acetate and methanol extracts when subjected to antimicrobial screening showed significant inhibitory activity to microbial growth, while the ethyl acetate showed demonstrated significant cytotoxicity to brine shrimp with LC50 of 0.50 ?g/ml. Key words: Anogeissus latifolia, Combretaceae, 3-?-hydroxy-28-acetyltaraxaren, ?-sitosterol, antimicrobial, cytotoxiciy, disc diffusion Dhaka Univ. J. Pharm. Sci. 6(1): 47-50, 2007 (June) The full text is of this article is available at the Dhaka Univ. J. Pharm. Sci. website

Prolyl Endopeptidase Inhibitors from Syzygium samarangense (Blume) Merr. & L. M. Perry

2004 ◽  
Vol 59 (1-2) ◽  
pp. 86-92 ◽  
Author(s):  
Evangeline C. Amor ◽  
Irene M. Villaseñor ◽  
Amsha Yasin ◽  
M. Iqbal Choudhary
Keyword(s):  
Betulinic Acid ◽  
Inhibitory Activity ◽  
Serine Proteases ◽  
Selective Inhibition ◽  
Prolyl Endopeptidase ◽  
Hexane Extract ◽  
First Report ◽  
Β Carotene ◽  
Plant Compounds

Compounds isolated from the hexane extract of the leaves of Syzygium samarangense (Blume) Merr. & L. M. Perry were tested for inhibitory activity against the following serine proteases: trypsin, thrombin and prolyl endopeptidase. The compounds were identified as an intractable mixture of α-carotene and β-carotene (1), lupeol (2), betulin (3), epi-betulinic acid (4), 2′,4′-dihydroxy-6′-methoxy-3′-methylchalcone (5), 2′-hydroxy-4′,6′-dimethoxy-3′- methylchalcone (6), 2′,4′-dihydroxy-6′-methoxy-3′,5v-dimethylchalcone (7), 2′,4′-dihydroxy- 6′-methoxy-3′-methyldihydrochalcone (8) and 7-hydroxy-5-methoxy-6,8-dimethylflavanone (9). Hydrogenation of compounds 5, 6 and 7 yielded compound 8, 2′-hydroxy-4′,6′-dimethoxy- 3′-methyldihydrochalcone (10) and 2′,4′-dihydroxy-6′-methoxy-3′,5-dimethyldihydrochalcone (11), respectively. The hydrogenated products of compounds 6 and 7 were also tested for enzyme inhibitory activity. In addition, β-sitosterol (12) and β-ᴅ-sitosterylglucoside (13) were also isolated. This is the first report of the isolation of compounds 1-6, 8 and 13 from this plant. Compounds 3-8 and 10 exhibited significant and selective inhibition against prolyl endopeptidase among three serine proteases. This is the first report of this kind of activity for all these compounds.

Sign in / Sign up

Export Citation Format

Share Document