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

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

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 Structure Elucidation of an Pentacyclic Triterpenoid and Phenolic from Steam Bark of Vitex Pubescens Vahl

2019 ◽  
Vol 1 (1) ◽  
pp. 68-74
Author(s):  
Lenny Anwar
Keyword(s):  
1H Nmr ◽  
13C Nmr ◽  
Betulinic Acid ◽  
Spectroscopic Data ◽  
Structure Elucidation ◽  
Stem Bark ◽  
Hydroxybenzoic Acid ◽  
Pentacyclic Triterpenoid ◽  
Reported Data ◽  
First Time

Pentacyclic triterpenoid, betulinic acid (1) and phenolic, p-hydroxybenzoic acid (2), had been isolated for the first time from the stem bark of Vitex pubescens Vahl. The structure of compounds 1 and 2 was determined based on the interpretation of spectroscopic data including UV, IR, NMR (1H-NMR, 13C-NMR, HMQC, HMBC, COSY) and MS, as well as by comparison with those reported data.

scholarly journals Investigations on Terminalia Arjuna Fruits: Part 1- Isolation of Comounds from Petroleum Ether Fractions

1970 ◽  
Vol 43 (1) ◽  
pp. 123-130 ◽  
Author(s):  
M Zahurul Haque ◽  
M Abdullah As Saki ◽  
M Umar Ali ◽  
M Yusuff Ali
Keyword(s):  
Petroleum Ether ◽  
Key Words ◽  
1H Nmr ◽  
13C Nmr ◽  
Chromatographic Separation ◽  
Spectroscopic Studies ◽  
Biologically Active ◽  
Terminalia Arjuna ◽  
Pure Compounds ◽  
Column Chromatographic

Arjun (Terminalia arjuna) is a source of many potent, biologically active compounds, planned all over Bangladesh. The chemical examinations of its fruits were taken up to isolate and identify active principles. For this purpose fresh fruits of Terminalia arjuna were extracted with rectified spirit. The extract was then triturated with petroleum ether (40-60°C), which was then subjected to column chromatographic separation followed by PTLC. Such separation led to the isolation of some new pure compounds, TA-1 to TA-5. The structures of compounds were characterized through spectroscopic studies (IR, 1H-NMR and 13C-NMR). Key words: Arjun, TA-1, TA-5, Spectroscopic studies DOI: 10.3329.bjsir.v43i1.863 Bangladesh J. Sci. Ind. Res. 43(1),123-130, 2008

Isolation of Bioactive Compounds from Aspergillus terreus

2004 ◽  
Vol 59 (3) ◽  
pp. 324-328 ◽  
Author(s):  
Muhammad I. Choudhary ◽  
Syed G. Musharraf ◽  
Talat Mukhmoor ◽  
Farzana Shaheen ◽  
Shamsher Ali ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
13C Nmr ◽  
Culture Medium ◽  
Aspergillus Terreus ◽  
Ethyl Acetate Extract ◽  
Microsporum Canis ◽  
Spectroscopic Techniques ◽  
Significant Activity ◽  
Nmr Data ◽  
First Time

A new metabolite, 6-(4’-hydroxy-2’-methyl phenoxy)-(-)-(3R)-mellein (1) was isolated from the ethyl acetate extract of Aspergillus terreus culture medium along with three known isocoumarin derivatives, (-)-(3R)-6-methoxymellein (2), (-)-(3R)-6,7-dimethoxymellein (Kigelin) (3) and (3R, 4R)-6,7-dimethoxy-4-hydroxymellein (4). Metabolites 1 and 4 showed significant activity against human pathogenic dermatophytes, Microsporum canis and Trichophyton longifusus. Metabolite 1 also exhibited potent antioxidant activity. The structures of metabolites were characterized on the basis of spectroscopic techniques. 13C NMR data of metabolites 2 - 4 are also being reported for the first time

scholarly journals Four Flavan-3-ol Compounds From The Stembark of Chisocheton balansae C.DC. (MELIACEAE)

Molekul ◽  
2021 ◽  
Vol 16 (1) ◽  
pp. 9
Author(s):  
Unang Supratman ◽  
Mohamad Fajar ◽  
Supriatno Salam ◽  
Rani Maharani ◽  
Desi Harneti ◽  
...  
Keyword(s):  
Ethyl Acetate ◽  
13C Nmr ◽  
Chemical Structure ◽  
Ethyl Acetate Extract ◽  
2D Nmr ◽  
Stem Bark ◽  
Spectroscopic Methods ◽  
Endemic Plants ◽  
North Sulawesi ◽  
First Time

Chisocheton balansae C.DC., is one of the Meliaceae family plants which is the endemic plants from Soputan Mountain, North Sulawesi, Indonesia. This study was aimed to determine the chemical structure of flavan-3-ol compounds from ethyl acetate extract of C. balansae C.DC stembark. Dried powder of C. balansae C.DC stem bark was extracted consecutively with n-hexane, ethyl acetate, and methanol solvents. Four flavan-3-ol compounds, named catechin (1), epicatechin (2), epigallocatechin-3-O-gallate (3), and epicatechin-3-O-gallate (4) were successfully isolated from ethyl acetate extract. The chemical structure of these isolates was determined by spectroscopic methods (1H-NMR, 13C-NMR, DEPT, and 2D-NMR) and comparison with previous reported spectral data. These compounds are first time reported from this plant.

scholarly journals DIPRENYLATED XANTHONE FROM THE STEM BARK OF KANDIS GAJAH (Garcinia griffithii)

2010 ◽  
Vol 8 (1) ◽  
pp. 97-100
Author(s):  
Elfita Elfita ◽  
Supriyatna Supriyatna ◽  
Husen H. Bahti ◽  
Dachriyanus Dachriyanus
Keyword(s):  
1H Nmr ◽  
13C Nmr ◽  
Spectroscopic Data ◽  
Stem Bark ◽  
First Time

A diprenylated xanthone, 1,5-dihydroxy-3-methoxy-4,7-diprenylxanthone (1) had been isolated the first time from the dichloromethane extract of the stem bark of Garcinia griffithii, together with 1,7-dihydroxyxanthone (2) and polyisoprenylated benzophenone, guttiferone I (3). The structure of these compounds were determined on the basis of spectroscopic data including UV, IR,  1H NMR, 13C NMR, HMQC, HMBC and COSY.   Keywords: diprenylated xanthone, 1,5-dihydroxy-3-methoxy-4,7-diprenylxanthone, Garcinia griffithii

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 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 The phytochemical investigation from n-hexane extract of the lichen Roccella montagnei

2021 ◽  
Vol 24 (2) ◽  
pp. first
Author(s):  
Thu Thi-Hoai Nguyen ◽  
Duong Thuc Huy
Keyword(s):  
Ethyl Acetate ◽  
Hexane Extract ◽  
Published Data ◽  
Chemical Structures ◽  
Nmr Data ◽  
Phytochemical Investigation ◽  
Partition Method ◽  
First Time ◽  
Ethyl Acetate Extracts

Introduction: R occella montagnei is widely distributed in subtropical regions. As the continuous study on the hexane extract of Roccella montagnei lichen, the isolation and structural determination of five compounds were addressed. Method: The crude extract was obtained from the dried lichen powder's extraction at room temperature. The n-hexane, n-hexane-ethyl acetate, and ethyl acetate extracts were obtained by the liquid-liquid partition method. The organic compounds were isolated from n-hexane extract by silica gel and Sephadex LH-20 column chromatography. Their chemical structures were identified by the NMR and HR-ESI-MS data analysis and the comparison of their NMR data with the published data. Results: Five compounds were isolated and chemically structural identified, consisting of 3b -hydroxy-7a-methoxystigmast-5-ene (1), sekikaic acid (2), lichenxanthone (3), (+)-6,8-dihydroxy-3-propyl-3,4-dihydroisocoumarin (4), and ar-turmerone (5). Conclusion: To the best of our knowledge, except 3 which was reported from this species for the first time, four isolated compounds left did not known to be present in Roccella genus before.

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