The ethyl acetate extract

The extraction of oil from passion fruit seeds with acetone, ethanol, ethyl acetate, isopropanol, and hexane was studied This study was the first step in investigating the exploitation of passion seeds as an additional dietary source of an essential polyunsaturated fatty acid (PUFA).

6p vibecca 01-10-2024 3 1   Download

In this study, the antidengue virus activity of the ethanol extract from the leaves and twigs of E. cyathophora on four virus serotypes DENV1-DENV4 was examined. The result showed that the ethanol extract displayed antidengue activity on DENV1-4 with PRNT50 values of 15.625-62.5 µg/mL. This extract was fractionated to the n-hexane and ethyl acetate fractions.

7p dianmotminh02 03-05-2024 6 2   Download

The phytochemical analysis and antibacterial and antioxidant activity of Ardisia silvestris extracts were carried out. The bioactive compounds of Ardisia silvestris leaves were extracted with petroleum ether, ethyl acetate, ethanol and water by immersion and microwave method. The DPPH method was used to determine the antioxidant activity of Ardisia silvestris extracts.

8p larachdumlanat129 19-01-2021 21 5   Download

The maceration was applied to the seeds of the plant to afford the crude extract which was then fractionated by liquid-liquid extraction to obtain the ethyl acetate extract. The extract was carried out by using normal phase silica gel column chromatography and thin-layer chromatography. Analysis of spectroscopic data including HR-ESI-MS, 1D and 2D-NMR and a comparison of the NMR data with that in the literature led to the structural elucidation of isolated compounds.

4p larachdumlanat127 02-01-2021 11 1   Download

Mugwort (Artemisia vulgaris L.) is a familiar herbal medicine and also a daily vegetable. It is one of the ingredients in the famous remedy "Cao ích mẫu" specializing in menstrual disorders or the omelet with mugwort that helps save blood flow to the brain to treat headaches. In both traditional medicine and the new drugs, diseases are usually treated by mugwort as diabetes, epilepsy combination for psychoneurosis, depression, irritability, insomnia, anxiety, and stress. To demonstrate the medicinal uses, the chemical constituents of this herbal were continually studied.

4p larachdumlanat127 02-01-2021 24 3   Download

The methanol extract of P. palatiferum (Nees) Radlk. leaves exhibited a moderate inhibitory effect on the L-3,4-dihydroxyphenylalanine (L-DOPA) oxidase activity of tyrosinase in the melanin biosynthesis pathway. Further study may lead to new bioactive compounds from ethyl acetate and n-hexane fractions.

11p tamynhan5 10-12-2020 28 2   Download

This fraction showed the highest antioxidant activity by dose-dependent free radical scavenging action (IC50 69.50 ± 1.55 µg/mL). R. tomentosa leaf extracts, especially the n-hexane fraction, also exhibited strong antimicrobial activity against Gram-negative and Gram-positive bacteria and fungi as well as moderate inhibitory effect on L-DOPA (L-3,4-dihydroxyphenylalanine) oxidase activity of tyrosinase in the melanin biosynthesis pathway.

9p tamynhan8 04-11-2020 13 1   Download

Investigation on the chemical constituents of ethyl acetate extract from leaves of Taxus wallichiana Zucc. (Taxaceae), collected in Ha Giang province, has resulted in the isolation of three metabolites for the first time: sciadopitysin (1), β-sitosterol (2), and isoquercitrin (3). Their structures were determined by spectroscopic methods.

6p koxih_kothogmih5 04-09-2020 25 2   Download

The main objective of this study was to confirm and estimate the algal inhibiting effects of the ethanol and ethyl acetate E. fortunei extracts at concentrations of 500 mg.L- in some natural water samples collected from Hoan Kiem and Lang Lakes. The results of this work may be useful for controlling the toxic cyanobacterium bloom in natural aquatic ecosystem.

10p koxih_kothogmih5 04-09-2020 12 4   Download

Nine Propionibacterium acnes (P. acnes) strains resistant to both clindamycin and erythromycin were selected to investigate the inhibitory ability of extracts and isolated compounds from leaves of Cassia grandis L.f to P. acnes. Ethyl acetate extract inhibited all P. acnes strains, with an aseptic ring diameter of 15-25 mm at a concentration of 200 mg/mL and a MIC value of 30 mg/mL.

11p slimzslimz 08-12-2019 6 2   Download

Helicteres hirsuta Lour., particularly its stems and leaves have been used in Vietnamese traditional medicine to cure furuncles, dysentery, measles and flu. In this study, we examined biological activities of 5 fractions from methanol extract of H. hirsuta roots. The results showed that ethyl acetate fraction has the highest content of phenolic and flavonoid compounds (220.9 ± 15.67 mg GAE, gallic acid equivalents/g dry weight and 23.03 ± 0.97 mg QE, quercetin equivalents/g dry weight, respectively).

7p shiwo_ding7 05-06-2019 42 2   Download

Knema is a genus of tropical evergreen trees of the family Myristicaceae found in South East Asian countries such as Vietnam, Thailand, and Malaysia. In this paper, four lignans, (+)-pinoresinol (1),(+) epi-pinoresinol (2), piperitol (3), and pluviatilol (4), were isolated from the ethyl acetate extract of the fruit of Knema pachycarpa, an indigenus tree in Vietnam. The chemical structures were determined by spectroscopic data and comparison with the reported literature. These compounds were isolated from Knema genus for the first time.

5p bautroibinhyen211 26-11-2018 21 1   Download

From the ethyl acetate extract of the rhizomes from Belamcanda chinensis (Iridaceae) five compounds irisflorentin (1), tectorigenin (2), iristectorigenin A (3), irigenin (4), and acetovanillone(5) were isolated. Their structures were elucidated by spectroscopic methods. This is first report of 5 from B. chinensis.

5p giesumanh 13-11-2018 32 1   Download

The ethanol extract of rambutan seeds were prepared by maseration method and the fractions (nhexane, ethyl acetate, buthanol and water) by separation of extract based on the polarity. The antioxidant activity was determined by using superoxide dismutase value (SOD), 1,1-diphenyl-2-picryl-hydrazyl (DPPH) radical scavenging activity,... Invite you to consult the documentation.

6p cnguyena1 25-03-2018 36 2   Download

The different components of the rihzomes of Alpinia laosensis Gagnep was extracted by petroleum ether, ethyl acetate and methanol. From residue of the extract of petroleum ether, 3- (p-acetylphenyl)-3-metylcacboxyl-1-propen was isolated fraction distillation. The structure of the compound determined methods.

4p uocvong04 24-09-2015 43 3   Download

Angelica sinensis (OLiv.) Diels ("Danggui") belongs to the family Umbelliferae. Its rhizomes are reputed to have marked restorative, antianaemic and haemagogic properties. From ethyl acetate and butanol extracts of rhizomes of this plant 8 nitrogen-containing compounds (1-8) have been isolated. Their structures were elucidated by means of MS and NMR spectroscopic methods as 5-oxo-proline, 5-oxo-prolin-ethylester, nicotinamide, tryptophane, perlolidine, 1,2,3,4-tetrahydro-1-methyl- -carboline-3-carboxylic acide, adenosine and uridine.

6p uocvong04 24-09-2015 49 3   Download

The rhizome of Angelica sinensis (Oliv.) Diels (Umbelliferae) is one of the most commonly used traditional drugs in China, indicated against anemia, menstrual disorders, amenorroehea and rheumatism. From the ethyl acetate extract of the roots of A. sinensis a stilbene, ferulic acid, coniferylferulate and decorticate have been isolated. Their structures were identified by MS and NMR spectroscopic methods.

5p uocvong04 24-09-2015 79 3   Download

The rhizome of Angelica sinensis (Oliv.) Diels (Umbelliferae) is known as "Danggui" in China, has been used widely in traditional Chinese medicine to treat irregular menstruation, anaemia, headache, hypertension, chronic asthma and rheumatism. From the ethyl acetate extract of its roots four phthalides have been isolated. Their structures were identified by MS and NMR spectroscopic methods to be (Z)-3-butylidenphthalide, senkyunolide H, senkyunolide I and dihydroxyligustilide.

4p uocvong04 24-09-2015 55 5   Download

Physalis philadelphicaLam, commonly known as a tomatillo, is a staple of the Mesoamerican cuisine. In our laboratory, an ethyl acetate-soluble extract and four withanolides [ixocarpalactone A (IxoA), ixocarpalac-tone B, philadelphicalactone B, and withaphysacarpin] were isolated. Stud-ies conducted on Hepa-1c1c7 hepatoma cells revealed that withanolides were potent inducers of quinone reductase, suggesting possible cancer chemo-protective activity.

10p inspiron33 23-03-2013 36 3   Download

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học General Psychiatry cung cấp cho các bạn kiến thức về ngành y đề tài:Therapeutic impact of the ethyl acetate extract of Tripterygium wilfordii Hook F on nephritis in NZB/W F1 mice...

11p thulanh12 13-10-2011 47 3   Download