scholarly journals Isolation and identification of different compounds from Citrus assamensis leaf

2021 ◽  
Vol 44 (2) ◽  
pp. 85-93
Author(s):  
Mohammad Shahriar Shahriar ◽  
Mohiuddin Ahmed Bhuiyan ◽  
Md Sohel Rana
Keyword(s):  
1H Nmr ◽  
13C Nmr ◽  
High Field ◽  
Spectroscopic Studies ◽  
Published Data ◽  
Leaf Extracts ◽  
Isolation And Identification ◽  
Academy Of Sciences

Six coumarins, one benzene, one flavone, one acridone, one limonoid, one triterpene and two phytosterol derivatives were isolated from the methanol, ethanol and chloroform leaf extracts of Citrus assamensis. Extensive spectroscopic studies, including high field 1H NMR and 13C NMR analyses, allowed the identification of thirteen known compounds as bergapten (1), umckalin (2), citropten (3), 4-hydroxybenzaldehyde (4), bergamottin (5), β-amyrin (6), umbeliferone (7), scopoletin (8), citrusinol (9), citracridone-III (10), limonin (11), stigmasterol (12), and β-sitosterol (13). The identity of these compounds was confirmed by comparison with published data as well as co-TLC with authentic samples. Journal of Bangladesh Academy of Sciences, Vol. 44, No. 2, 85-93, 2020

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

scholarly journals A Spinasteryl Glycoside from Ipomoea turpethum L. Herb (Stem) Growing in Bangladesh

2012 ◽  
Vol 36 (1) ◽  
pp. 13-17
Author(s):  
Md Harun Or Rashid ◽  
Md Abdul Gafur ◽  
Md Moklesur Rahman Sarker ◽  
Nurul Karim
Keyword(s):  
Salicylic Acid ◽  
Ir Spectroscopy ◽  
1H Nmr ◽  
13C Nmr ◽  
Spectroscopic Analysis ◽  
Chromatographic Purification ◽  
Stem Extract ◽  
Academy Of Sciences

Chromatographic purification and spectroscopic analysis of the constituents from the stem  extract of Ipomoea turpethum L. reported 22, 23-dihydro-?-spinasteryl-?-D glucoside (H-1) in  addition to salicylic acid and N-p-comaryltyramine. The structures were elucidated by  spectroscopic analysis including 1H-NMR and 13C-NMR, 1H-1H COSY, 1H-13C COSY, HMQC,  HMBC, UV and IR spectroscopy. 22, 23-dihydro-?-spinasteryl-?-D-glucoside is first reported  from Ipomoea turpethum. DOI: http://dx.doi.org/10.3329/jbas.v36i1.10906 Journal of Bangladesh Academy of Sciences, Vol. 36, No. 1, 13-17, 2012

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

A preliminary analysis of the high field 13C-NMR and 1H-NMR spectra of poly(2-thienyl vinyl ketone)

1994 ◽  
Vol 32 (3) ◽  
pp. 305-310
Author(s):  
D. L. Trumbo ◽  
S. C. Guhaniyogi ◽  
H. J. Harwood
Keyword(s):  
1H Nmr ◽  
13C Nmr ◽  
Preliminary Analysis ◽  
High Field ◽  
Nmr Spectra ◽  
Vinyl Ketone ◽  
1H Nmr Spectra

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)

scholarly journals Identification and Quantitation of Ursolic and Oleanolic Acids in Ilex aquifolium L. Leaf Extracts Using 13C and 1H-NMR Spectroscopy

Molecules ◽  
2019 ◽  
Vol 24 (23) ◽  
pp. 4413
Author(s):  
Doreen Palu ◽  
Ange Bighelli ◽  
Joseph Casanova ◽  
Mathieu Paoli
Keyword(s):  
Nmr Spectroscopy ◽  
1H Nmr ◽  
13C Nmr ◽  
1H Nmr Spectroscopy ◽  
Limit Of Detection ◽  
Biologically Active ◽  
Leaf Extracts ◽  
Simple Method ◽  
Ilex Aquifolium ◽  
Limit Of Quantitation

Leaves of Ilex aquifolium L. have been used for their therapeutic properties. In previous studies, components contained in the leaves were first isolated by various chromatographic techniques. Then, quantitation of oleanolic and ursolic acids, which are responsible for the biological and therapeutic activities of the plant, was performed by HPLC, HPTLC, and somewhat by GC-MS. Our objective was to develop a simple method that allows the identification of compounds contained in the leaves of Corsican I. aquifolium and to quantify ursolic and oleanolic acids. Leaves were successively extracted with hexane and dichloromethane. The extracts were chromatographed on silica gel and the fractions of column chromatography submitted to 13C-NMR analysis, following a computerized method developed in the laboratory. 13C-NMR allowed the identification of various triterpenes including ursolic acid and oleanolic acid. Quantitation of both acids was achieved, for the first time, by 1H-NMR after validation of the method (accuracy, precision, linearity, limit of detection and limit of quantitation). Ursolic and oleanolic acids accounted for 55.3% and 20.8% of the dichloromethane extract, respectively. This represents 1.3% and 0.5% of the mass of dried leaves. 1H-NMR spectroscopy appeared as a powerful tool for a rapid quantitation of biologically active compounds from I. aquifolium.

scholarly journals Synthesis, Spectroscopic Studies and Keto-Enol Tautomerism of Novel 1,3,4-Thiadiazole Derivative Containing 3-Mercaptobutan-2-one and Quinazolin-4-one Moieties

Molecules ◽  
2020 ◽  
Vol 25 (22) ◽  
pp. 5441
Author(s):  
Sewara J. Mohammed ◽  
Akam K. Salih ◽  
Mohammad Amin M. Rashid ◽  
Khalid M. Omer ◽  
Karzan A. Abdalkarim
Keyword(s):  
1H Nmr ◽  
13C Nmr ◽  
Solvent Polarity ◽  
Spectroscopic Studies ◽  
Keto Form ◽  
Tautomeric Forms ◽  
Fragmentation Mechanisms ◽  
Visible Spectra ◽  
Thiadiazole Derivative ◽  
Uv Visible

In this study, a novel 1,3,4-thiadiazole derivative containing 3-mercaptobutan-2-one and quinazolin-4-one moieties (Compound 3) is synthesized by the coupling of 2-amino-1,3,4-thiadiazole-5-(3-mercaptobutan-2-one) (Compound 1) with 2-Phenyl-4H-3,1-benzoxazin-4-one (Compound 2) in one molecule moiety. Compound 3 is found to exist as two types of intra-molecular hydrogen bonding with keto-enol tautomerism characters, which is further confirmed using FTIR, 1H-NMR, 13C-NMR, mass spectrometer, and UV-Visible spectra. The 1H-NMR and UV-Visible spectra of Compound 3 are investigated in different solvents such as methanol, chloroform, and DMSO. Compound 3 exhibits keto-enol tautomeric forms in solvents with different percentage ratios depending on the solvent polarity. The 1H-NMR and UV-Visible spectral results show that Compound 3 favors the keto over the enol form in polar aprotic solvents such as DMSO and the enol over the keto form in non-polar solvents such as chloroform. The 13C-NMR spectrum gives two singles at δ 204.5 ppm, due to ketonic carbon, and δ 155.5 ppm, due to enolic carbon, confirming the keto-enol tautomerism of Compound 3. Furthermore, the molecular ion at m/z 43 and m/z 407 in the mass spectrum of Compound 3 and fragmentation mechanisms proposed reveal the existence of the keto and enol forms, respectively.

scholarly journals Isolasi dan Identifikasi Senyawa Seskuiterpen dari Curcuma soloensis Val. (Temu Glenyeh)

2018 ◽  
Vol 4 (2) ◽  
pp. 137-142
Author(s):  
Soerya Dewi Marliyana ◽  
Muhamad Widyo Wartono ◽  
Fajar Rakhman Wibowo ◽  
Gesti Munasah
Keyword(s):  
Data Analysis ◽  
Medicinal Plant ◽  
1H Nmr ◽  
13C Nmr ◽  
Nmr Spectra ◽  
2D Nmr ◽  
Chemical Components ◽  
Spectroscopic Methods ◽  
Isolation And Identification

Curcuma soloensis Val. is a family plant Zingiberaceae and is known as "temu gelnyeh". This plant has been used as a medicinal plant but has not been widely reported about its chemical components. Therefore, this study was carried out to isolation and identification of the chemical components of the C. soloensis Val. rhizome. Isolation was done by extraction, fractionation, and purification. The fractionation and purification of the compound were carried out using chromatography methods. The identification of the compound was determined by spectroscopic methods including 1D-NMR (1H NMR, 13C NMR) and 2D-NMR (HSQC, HMBC). Based on NMR spectra data analysis and compared with literature, the compound obtained yellow liquid was ar-turmerone (2-methyl-6- (4-methylphenyl) hept-2-en-4-on) which was a terpenoid sesquiterpene. Ar-turmerone is the first compound that found from Curcuma soloensis Val. rhizome.  

Synthesis and Biological Evaluation of Various New Substituted 1,3,4-oxadiazole-2-thiols

2008 ◽  
Vol 59 (4) ◽  
Author(s):  
Gabriela Laura Almajan ◽  
Stefania Felicia Barbuceanu ◽  
Ioana Saramet ◽  
Mihaela Dinu ◽  
Cristian Vasile Doicin ◽  
...  
Keyword(s):  
Biological Activity ◽  
Plant Growth ◽  
1H Nmr ◽  
Elemental Analysis ◽  
13C Nmr ◽  
Biological Evaluation ◽  
Ethyl Chloroacetate ◽  
Low Concentrations ◽  
Synthesis And Biological Evaluation

5-[4-(4X-phenylsulfonyl)phenyl]-1,3,4-oxadiazole-2-thiols, X=H, Cl, Br, reacted with ethyl chloroacetate to give S-alkylated compounds. Aminomethylation of the thione form of oxadiazoles yielded N(3)-derivatives. All the products have been characterized by elemental analysis, IR, 1H-NMR and 13C-NMR. The plant-growth regulating effects of the title compounds were examined. From the biological activity results, we found that most compounds showed weak stimulatory activities at low concentrations.

Synthesis and Spectral Characterization of New S-Alkylated 1,2,4-Triazoles as Potential Biological Agents

2017 ◽  
Vol 68 (10) ◽  
pp. 2436-2439
Author(s):  
Stefania Felicia Barbuceanu ◽  
Laura Ileana Socea ◽  
Constantin Draghici ◽  
Elena Mihaela Pahontu ◽  
Theodora Venera Apostol ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Spectral Data ◽  
1H Nmr ◽  
Elemental Analysis ◽  
13C Nmr ◽  
Ethyl Bromide ◽  
Spectral Characterization ◽  
Basic Medium ◽  
Phenacyl Bromide

In the work we presented the behavior of 5-(4-(4-X-phenylsulfonyl)phenyl)-4-(n-propyl)-2H-1,2,4-triazole-3(4H)-thiones (X= Cl or Br) with some alkylation agents. Thus, new S-alkylated 1,2,4-triazole derivatives were synthesized by reaction of the corresponding 1,2,4-triazole-3-thione derivatives with different �-halogenated compounds (ethyl bromide, ethyl chloroacetate or phenacyl bromide), in basic medium. The structures of synthesized compounds were elucidated by spectral data (1H-NMR, 13C-NMR, mass spectrometry) and elemental analysis.

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