Comparison with the reported data

Seven known compounds, including two neolignans, four lignans, and one flavane were isolated from the methanol extract of Pandanus tonkinenis fruits. Their structures were determined to be ficusal, vladinol F, medioresinol, syringaresinol, lariciresinol, secoisolariciresinol, and luteoliflavan by analysis of MS and NMR data as well as by comparison of their spectral data with those reported in the literature.

7p dianmotminh02 03-05-2024 3 1   Download

From CHCl3-soluble extract of the leaves of Taxus wallichiana (Taxaceae), collected in Lam Dong Province, five compounds were isolated and identified as sciadopitysin, ginkgetin, (S)-(+)-rhododenol, (+)-erythro-N-benzoyl3-phenylisoserine methyl ester, and (−)-α-conidendrin (5). Their chemical structures were determined by 1D and 2D NMR spectra and comparison with published data. Except for (−)-α-conidendrin, these remaining compounds were first reported of Taxus wallichiana.

6p dianmotminh02 03-05-2024 5 3   Download

One new sesquiterpene, (4S,7R,10S)-2-oxo-4,10,11-trihydroxyguaia-1(5)-ene, and five lignans, kadsuralignan J, isovaleroylbinankadsurin A, schizandrin O, futokakadsurin C and arisantetralone were isolated from the roots of Kadsura induta. Their chemical structures were revealed by MS, 1D and 2D NMR spectra in comparison with the reported data. The absolute configuration of compound 1 was determined by calculation of its theoretical ECD spectra and compared with the experimental results.

9p dianmotminh02 03-05-2024 4 2   Download

In this paper, the isolation and structural elucidation of three compounds: albifolione (1), zeorin (2), and atranorin (3) from the lichen P. cristiferum are reported. Their structures were elucidated from spectroscopic data and comparison with literature data.

6p vinebula 02-06-2023 6 2   Download

Reference intervals are the most common decision support tool used for interpretation of numerical pathology reports. As laboratory results may be interpreted by comparison with these intervals, the quality of the reference intervals can play as large a role in result interpretation as the quality of the result itself.

5p tailieucuibap 19-06-2022 11 2   Download

Three flavones (1-3) were isolated from the aerial part of Tithonia diversifolia (Hemsl.) A. Gray growing in Hoa Binh province, Vietnam. Their structures were identified as hispidulin (1), nepetin (2) and luteotin (3) by analysis of these spectroscopic MS, NMR data and comparison with reported data.

4p viericschmid 12-01-2022 16 0   Download

The compounds were identified by the use of 1D- and 2D-NMR and UV spectroscopic techniques and by comparisons with the reported data. The acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) inhibitory activities of the acetone, methanol, and water extracts of the plant and of the flavones penduletin and apigenin were evaluated at 200 µg/mL. The water extract exhibited better activity against the enzyme AChE as compared to both the acetone and the methanol extracts. Penduletin (1) showed significant activity against BChE (66.

9p langthannam 29-12-2021 10 0   Download

The present study was conducted to collect, record, and document local knowledge of medicinal practices in Düzce, a northwestern Anatolian province. To the best of our knowledge, no comprehensive ethnobotanical study has been reported from this province. Information was acquired through semistructured interviews and personal conversations using a questionnaire and numerous guided field trips with local knowledgeable people. For quantitative analyses and comparisons, recorded data such as informant consensus factor (FIC) and use value (UV) were calculated, respectively.

81p tudichquannguyet 29-11-2021 9 0   Download

This is the first time that it is from its roots, which were collected at Vi Xuyen district - Ha Giang province, were five compounds isolated. These compounds include two phenylethanoid glycosides, verbascoside (1), arenarioside (2); one iridoid glucoside, myxopyroside (3); one indole, 3-formylindole (4), and one furfural, 5-hydroxymethyl furfural (5). Their chemical structures were determined by ESI-MS, 1D-, 2D-NMR spectroscopic data analysis as well as in comparison with those reported in the literatures.

9p spiritedaway36 25-11-2021 4 1   Download

Seven compounds were isolated and characterized from the culture broth of the marine bacteria Nocardiopsis sp. (strain G057), which was isolated from sediment collecting at Cô Tô – Quảng Ninh. Their structures were determined by spectroscopic analysis including MS and 2D NMR, as well as by comparison with reported data in the literature. All compounds were evaluated for their antimicrobial activity against a panel of clinically significant microorganisms. Compounds 1, 2 and 7 selectively inhibited Escherichia coli with a MIC value of 32, 64, 8 μg/mL, respectively.

5p cothumenhmong11 10-05-2021 8 1   Download

One lignan (7′S,8′R,8S)-4,4′-dihydroxy-3,3′,5,5′-tetramethoxy-7′,9-epoxylignan-9′-ol-7-one (1) together with four neolignans (7α,8α)-dihydrodehydrodiconiferyl alcohol 9-O-β-D-glucopyranoside (2), (7α,8α)-dihydrodehydrodiconiferyl alcohol 9′-O-β-D-glucopyranoside (3), icariside E3 (4), and icariside E5 (5) were isolated from Pouzolzia sanguinea. Their chemical structures were elucidated by ESI-MS, NMR spectra, as well as in comparison with the data reported in literature.

7p cothumenhmong11 06-05-2021 10 2   Download

Three dihydrostilbene glycosides, 3,5-dihydroxydihydrostilbene 4′-O-β-D-glucopyranoside (1), 3,5- dimethoxydihydrostilbene 4′-O-α-L-rhamnopyranosyl-(1→6)-β-D-glucopyranoside (2), 5,4′-dihydroxydihydrostilbene 3-O-β-D-glucopyranoside (3), and one lignan, nudiposide (4) were isolated from the methanol extract of leaves of Camellia sasanqua Thunb. Their chemical structures were determined by using ESI-MS and NMR spectra as well as in comparison with the reported data. Compounds 3 and 4 were reported from Camellia genus for the first time.

5p cothumenhmong11 06-05-2021 15 2   Download

Their chemical structures were determined using ESI-MS, 1D NMR, and 2D NMR spectra as well as by comparison of the spectral data with those reported in the literature. Compounds 4 and 5 were reported from Xanthium genus for the first time. To our best knowledge, all these compounds were firstly reported from X. strumarium growing in Vietnam.

6p cothumenhmong11 06-05-2021 18 2   Download

Eight sesquiterpenoids including costunolide (1), parthenolide (2), 11α,13-dihydroparthenolide (3), 9β-hydroxydihydroparthenolide (4), (-)-bisparthenolidine (5), 11α,13-dihydro-β-cyclocostunolide (6), α-cadinol (7), magnograndiolide (8) were isolated from the barks and roots of Michelia alba. The structures of these compounds were elucidated by spectroscopic methods (MS, 1D and 2D NMR) and comparison with the reported data. Compounds 5-8 have been isolated for the first time from Michelia alba.

7p nguaconbaynhay11 16-04-2021 14 2   Download

Three iridoids, asperulosidic acid (1), geniposidic acid (2), and galioside (3) and three anthraquinones, 2- hydroxymethyl-3-hydroxyanthraquinone (4), rubiadin-1-methyl ether (5), and anthragallol-2-methyl ether (6) were isolated from the methanol extract of the Morinda officinalis leaves. Their chemical structures were elucidated by ESIMS, 1D- and 2D-NMR spectra and comparison with the data reported in the literature. Galioside (3) was reported from Morinda genus for the first time.

5p nguaconbaynhay11 16-04-2021 19 1   Download

Chemical investigation of the marine sponge-derived fungal strain Aspergillus sp. IMBC-FP2.05 resulted in isolation of five compounds, including JBIR-74 (1), homogentisic acid (2), methyl (2,5-dihydroxyphenyl)acetate (3), 3- chloro-2,5-dihydroxybenzyl alcohol (4), and p-hydroxybenzaldehyde (5). Their chemical structures were identified by comprehensive analyses of the 1D and 2D NMR and mass spectra in comparison with the previously reported data. Furthermore, nitric oxide (NO) inhibitory effects of the isolated compounds in LPS-stimulated RAW264.7 cells were also reported.

5p nguaconbaynhay11 16-04-2021 9 2   Download

A new iridoid, (4S,5R,6S,7S,9S)-7,10,11-trihydroxy dihydronepetalactone (1) together with four known flavonoids including linarin, neodiosmin, neobudofficide and rhoifolin were isolated from aerial parts of Valeriana hardwickii Wall.. Chemical structures were elucidated by extensive spectroscopic analyses including ESI-HRMS and 1D, 2DNMR spectral data as well as by comparison with those reported in the literatures. Compound 1 showed no cytotoxic activity toward three human cancer cell lines (CCRF-CEM, MDA-MB-231 and HCT-116).

5p nguaconbaynhay11 16-04-2021 13 1   Download

To the best of our knowledge, garcinone D, fuscaxanthone I and parvifoliol F were first reported as components of Garcinia cowa. Four isolated xanthones were investigated for antioxidant activities through the extent of their abilities to scavenge the ABTS·+ radical cation. The result showed that compounds 1 and 2 exhibited potent antioxidant activities with IC50 values of 74.45 ± 8.89 µM and 64.56 ± 4.51 µM, respectively.

10p nguaconbaynhay11 01-04-2021 9 2   Download

The tracheobronchomalacia is a life-threatening complication of mucopolysaccharidosis (MPS) without known effective, optimal treatment. The severe expiratory collapse of the trachea and bronchi is one of causes of the high rate of deaths in the course of airway impairment in MPSII patients.

4p vimaine2711 26-03-2021 19 3   Download

A phytochemical investigation of whole Aspidistra letreae plants led to the isolation of 2Hchromen-2-one (1), α-tocopherol (2), (E)-phytol (3), asparenydiol (4) and (25S)-spirost-1β,3α,5β-triol (5). Their structures were determined on the basis of NMR spectral evidences and in comparison with the reported data. Of these, asparenydiol (4) was isolated from the genus Aspidistra for the first time. This is also the first report on the separation and structural determination of (25S)-spirost-1β,3α,5β-triol (5) as a pure compound.

9p nguaconbaynhay9 03-12-2020 12 3   Download