scholarly journals THE STUDY ON CHEMICAL CONSTITUENTS FROM THE SEED OF CAESALPINIA BONDUCELLA FLEM. (CAESALPINIACEAE)

2011 ◽  
Vol 14 (2) ◽  
pp. 5-11
Author(s):  
Nhan Trung Nguyen ◽  
Dung Thi Thuy Vu ◽  
Mai Thi Thanh Nguyen
Keyword(s):  
Chemical Constituents ◽  
Published Data ◽  
Spectroscopic Methods ◽  
Caesalpinia Bonducella

From the seed of Caesalpinia bonducella Flem. (Caesalpiniaceae), four compounds were isolated: caesalpinin K (1), caesalpinin E (2), caesalpinin J (3) and caesalpinin MP (4). Their structures were determined by spectroscopic methods and compared with published data.

scholarly journals CHEMICAL CONSTITUENTS OF THE SEED OF CASSIA OCCIDENTALIS L. (CAESALPINIACEAE).

2011 ◽  
Vol 14 (2) ◽  
pp. 89-95
Author(s):  
Nhan Trung Nguyen ◽  
Mai Thi Phuong Pham ◽  
Mai Thi Thanh Nguyen
Keyword(s):  
Ferulic Acid ◽  
Chemical Constituents ◽  
Chloroform Extract ◽  
Published Data ◽  
Spectroscopic Methods ◽  
Cassia Occidentalis ◽  
Chemical Structures

From the chloroform extract of the seed of Cassia occidentalis L., which was collected in Dong Nai province, four compounds were isolated: emodin (1), ferulic acid (2), quercetin (3) and tectochryzin (4). Their chemical structures were elucidated by using spectroscopic methods and comparision with published data.

scholarly journals THE STUDY ON CHEMICAL CONSTITUENTS FROM THE NEEDLES OF TAXUS WALLICHIANA ZUCC. (TAXACEAE)

2009 ◽  
Vol 12 (10) ◽  
pp. 57-63
Author(s):  
Tam Thi Thanh Nguyen ◽  
Nhan Trung Nguyen
Keyword(s):  
Chemical Constituents ◽  
Published Data ◽  
Spectroscopic Methods ◽  
Chemical Structures ◽  
Taxus Wallichiana

A new taxane-type diterpene named 10-deacetyltaxuspine F (2) together with a known compound, taxuspine F (1), were isolated from the needles of Taxus wallichiana Zucc. (Taxaceae). Their chemical structures were elucidated by using spectroscopic methods and comparision with published data.

scholarly journals CONTRIBUTE TO STUDY ON CHEMICAL CONSTITUENTS OF URENA LOBATA (L.) OF VIETNAM

2019 ◽  
Vol 57 (2) ◽  
pp. 162
Author(s):  
Quan Minh Pham ◽  
Hoai Van Thi Tran ◽  
Lam Tien Do ◽  
Phuong Lan Doan ◽  
Inh Thi Cam ◽  
...  
Keyword(s):  
Mental Disorders ◽  
Ethyl Acetate ◽  
Ethyl Acetate Extract ◽  
Chemical Constituents ◽  
2D Nmr ◽  
Spectroscopic Methods ◽  
Tree Roots ◽  
Chemical Structures ◽  
Phytochemical Investigation ◽  
First Time

Urena lobata L. is used in Vietnamese traditional medicine for the treatment of several diseases. Tree roots are used to treat rheumatism, dysentery, poor digestion, flu, tonsils, malaria, asthma, goiter. Flowers are used to treat chickenpox, fever, and mental disorders. Branches, leaves or whole trees used to treat injuries bruises, rheumatism, mastitis, bites. Phytochemical investigation of the n-hexan and ethyl acetate extract of Urena lobata L. led to the isolation of β-sitosterol (1), β-sitosterol-3-O-β-D-glucopyranoside (2), a-acetylamino-phenylpropyl a-benzoylamino-phenylpropanoate (3), quercetin (4), and trans-tiliroside (5). Their chemical structures were determined by spectroscopic methods including MS, 1D, 2D NMR and comparing with those reported in previous papers. Two compounds 3, 5 were isolated for the first time from Urena lobata plant.

scholarly journals Studies on Chemical Constituents and Biological Activities of an Endophytic Fungi from Magnifera indica L.

2015 ◽  
Vol 13 (1) ◽  
pp. 63-67
Author(s):  
Mozammel Haque ◽  
Mohammad Shoeb ◽  
Nilufar Nahar
Keyword(s):  
Ethyl Acetate ◽  
Ethyl Acetate Extract ◽  
Biological Activities ◽  
Chemical Constituents ◽  
Radical Scavenging ◽  
Acid Methyl Ester ◽  
Diffusion Method ◽  
Published Data ◽  
Nmr Studies ◽  
Brine Shrimp Lethality Assay

Two compounds, ergosterol (1) and 4-hydroxy-hexadec-6-enoic acid methyl ester (2) were isolated from the ethyl acetate extract of the endophytic fungal strain labeled as MI-3, isolated from the leave of Magnifera indica L. The structures of the isolated compounds were elucidated by 1H NMR studies and comparing with published data. The crude ethyl acetate extract, three column fractions and ergosterol were tested for antimicrobial activity against five Gram-positive and eight Gram-negative bacteria and three fungi by disc diffusion method. The general toxicity and antioxidant activity of the parent extract, column fractions and ergosterol were also evaluated by using brine shrimp lethality assay and free radical scavenging assay, respectively. Low activities were observed in all cases. DOI: http://dx.doi.org/10.3329/dujps.v13i1.21862 Dhaka Univ. J. Pharm. Sci. 13(1): 63-67, 2014 (June)

scholarly journals JOINT SEALS FOR HYDRAULIC STRUCTURES IN SEVERE CLIMATES

2014 ◽  
Vol 20 (1) ◽  
pp. 38-46 ◽  
Author(s):  
Jahangir Mirza
Keyword(s):  
Cement Mortar ◽  
Chemical Constituents ◽  
Deformation Behaviour ◽  
Peel Strength ◽  
Climatic Conditions ◽  
Hydraulic Structures ◽  
Published Data ◽  
Closed Cell ◽  
Dry Conditions ◽  
Steel Substrates

This paper presents laboratory test data on 21 joint seals: 10 field-moulded sealants (FMS; 1- and 2-components polyurethanes, polysulphides, silicones, etc.) and 11 preformed seals (neoprene, silicone, high-density open-cell and low-density closed-cell foams, etc.). The aim was to evaluate their performance in submerged, partially submerged and essentially dry conditions in extremely severe climates. These seals were tested on cement mortar substrates as well as on steel substrates. The tests carried out on FMS were: adhesion-in-peel strength, compression-extension cycling at severe temperatures, Shore A hardness, weatherability and modulus of elasticity, etc. On preformed seals, the tests conducted were weatherability, % recovery and load deformation behaviour, etc. Conclusions, recommendations and the specific suitability of joint seals with cement mortar and steel substrates are reported. The general conclusion is that even though the joint seals evaluated had similar base chemical constituents, they showed variable results. Their properties and characteristics differ from one manufacturer to others, indicating that prior knowledge about their performance is essential to the user. Furthermore, the published data on the performance of seals used in hydraulic structures situated in severe climatic conditions is sparse. It is recommended that utilities publish as much information as possible to help others.

Chemical Constituents from Euphorbia helioscopia

2011 ◽  
Vol 396-398 ◽  
pp. 1337-1340 ◽  
Author(s):  
Di Geng ◽  
Lian Jin Weng ◽  
Yuan Yuan Han ◽  
Xin Yang
Keyword(s):  
Silica Gel ◽  
Chemical Constituents ◽  
2D Nmr ◽  
Spectroscopic Methods ◽  
Nmr Spectrum ◽  
Euphorbia Helioscopia ◽  
First Time ◽  
Spectrum Data

AIM: To study the chemical constituents of Euphorbia helioscopia. METHODS: Compounds 1-10 were isolated and purified by silica gel, Sephadex LH-20 and Rp-18 chromatogarphy. Their structures were elucidated mainly by spectroscopic methods. RESULTS: Ten known compounds, helioscopinolide A(1), helioscopinolide B(2), scopoletin(3), scoparone(4), isoscopoletin(5), licochalone A(6), quercelin(7), 7, 4’-dihydroxy-5-methoxy flacanone(8), 2’, 4’-dihydroxy-6’-methoxydihydrochalcone(9) and pinocembrin(10), were isolated and structurally elucidated. CONCLUSION: Compound 3-5 and 8-10 were isolated from this plant for the first time. 2D NMR spectrum data of 2 were also reported in this paper.

Design Considerations for Space Mission Washwater Processing by Reverse Osmosis

1973 ◽  
Vol 95 (4) ◽  
pp. 1030-1038
Author(s):  
G. W. Wells ◽  
W. Wong ◽  
D. F. Putnam
Keyword(s):  
Reverse Osmosis ◽  
Chemical Constituents ◽  
Theoretical Estimate ◽  
Space Mission ◽  
Wash Water ◽  
Personal Hygiene ◽  
Published Data ◽  
Mass Balances ◽  
Major Chemical ◽  
The Impact

Reverse osmosis (RO) is shown to be a promising method of reclaiming wash water. The amounts of wash water and cleansing agent required for showering, personal hygiene, housekeeping, dish washing, laundry, and experiment purposes are presented and the impact of clothing types and laundry schedule are discussed. A theoretical estimate of the contaminants found in wash water is made based on published data for sebum, sweat, and other body excretions. An analytical method for calculating mass balances in a reverse osmosis recycle system is presented and concentrations of the major chemical constituents expected in the RO feed, product and brine streams are projected.

The chemical constituents of Australian Flindersia species. XIX. Triterpenoids from the leaves of F. bourjotiana F. Muell

1966 ◽  
Vol 19 (3) ◽  
pp. 455 ◽  
Author(s):  
GJW Breen ◽  
E Ritchie ◽  
WTL Sidwell ◽  
WC Taylor
Keyword(s):  
Chemical Constituents ◽  
Chemical Degradation ◽  
Spectroscopic Methods ◽  
The Absolute ◽  
Absolute Stereochemistry

From the leaves of Flindersia bourjotinna F. Muell. there were isolated sitosterol, triacontanol, lupeol, germanicol, germanicone, and four new triterpenoids, the bourjotinolones A, B, and C, and bourjotone. By chemical degradation and spectroscopic methods, the structures of these substances were shown to be 21,24-epoxy-23,25-dihydroxytirucall-7-en-3one, 23,24-dihydroxytirucalla-7,25-dien- 3-one, 25-chloro-23,24-dihydroxytirucall-7-en-3-one, and 25,26,27-trisnortirucall-7- ene-3,23-dione, respectively. Bourjotinolone C is almost certainly an artefact but bourjotinolone B and bourjotone are less likely to be. From biogenetic and N.M.R. spectral considerations, the absolute stereochemistry of the new triterpenes may be deduced.

scholarly journals CHEMICAL CONSTITUENTS OF THE ROOT OF STREPTOCAULON JUVENTAS MERR.

2011 ◽  
Vol 14 (2) ◽  
pp. 28-35
Author(s):  
Hao Xuan Bui ◽  
Duc Minh Nguyen ◽  
Quan Le Tran
Keyword(s):  
Methanol Extract ◽  
Chemical Constituents ◽  
Spectroscopic Methods ◽  
First Time

From the methanol extract of the root of Streptocaulon juventas Merr, three cardenolide derivatives were isolated. Their strutures were determined by spectroscopic methods. This is the first time that (17α)-H-periplogenin-3-O-β-D-glucopyranosyl-(1–4)-2-O-acetyl-3-O-methyl-β- fucopyranoside (1) and periplogenin-3-O-β-cymaropyranosyl-(1®4)--glucopyranoside (2) were isolated from the root of S. juventas together with the known 17α-H-periplogenin-3-O-β- digitoxopyranosyl-(1®4)-O-β-glucopyranosyl-(1®6)-O-β-glucopyranoside (3).

scholarly journals Chemical Constituents from an Endophytic Fungus Chaetomium Globosum Z1

2013 ◽  
Vol 8 (9) ◽  
pp. 1934578X1300800
Author(s):  
Chun-Yan Zhang ◽  
Xiao Ji ◽  
Xuan Gui ◽  
Bao-Kang Huang
Keyword(s):  
Cytotoxic Activity ◽  
Cell Lines ◽  
Endophytic Fungus ◽  
Chemical Constituents ◽  
2D Nmr ◽  
Chaetomium Globosum ◽  
Spectroscopic Methods ◽  
Esi Ms

A new ergosterol, 15β-hydroxyl-(22 E,24 R)-ergosta-3,5,8,22-tetraen-one (1), along with three known ergosterols, two known cytochalasins, and two known azapholines were isolated from Chaetomium globosum Z1. The structures of these compounds were elucidated on the basis of spectroscopic methods (HR-ESI-MS, 1D NMR, and 2D NMR). Compound 6 showed significant cytotoxic activity against A-549 and MG-63 cell lines with IC50 values of 6.96 and 1.73 μg/mL, respectively.

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