A new approach for the synthesis of sotolon in racemic and enantioenriched formsSotolon (3-hydroxy-4,5-dimethyl-2(5H)-furanone) has been synthezised both in racemic and enantioenriched forms by a short sequence involving intramolecular tandem isomerization-aldolisation and tandem izomerization/Mannich reactions as key steps. Optically active Sotolon has been obtained by using (S)-N-tert-butane sulfinimine as a chiral starti...
5 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 659 | Lượt tải: 0
Anti-inflammatory metabolites from a marine sponge-associated fungus Aspergillus sp. IMBC-FP2.05Chemical 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 compre...
5 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 512 | Lượt tải: 0
Synthesis, characterization and biological activity of mixed ligand chelates of Ni(II) with pyridoxalthiosemicarbazone and dipeptidesThe synthesis, characterization of mixed ligand chelates of Ni(II), [NiAL] involving Pyridoxalthiosemicarbazone (A) and dipeptides (L) viz., glycyl-glycine (gly-gly), glycyl-L-leucine (gly-leu), glycyl-L-tyrosine (gly-tyr) and glycylL-valine (gly-val) and their biological activities have been studied. The complexes were characterized based on thei...
12 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 149 | Lượt tải: 0
Essential oils of Tunisian Pinus radiata D. Don, chemical composition and study of their herbicidal activityLittle is known about the phytotoxic effects of essential oils from Pine species, GC and GC/MS analysis of Pinus radiata D. Don essential oil obtained from needles, resulted in the identification of 49 components comprising 97.6 % of the oil totality. The composition was l dominated by monoterpene hydrocarbons (86.4 %) with β-pinene (40.2 %), li...
6 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 302 | Lượt tải: 0
Isolation of lignans and neolignans from Pouzolzia sanguinea with their cytotoxic activityOne 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. T...
7 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 241 | Lượt tải: 0
Synthesis of 2-(3-methyl-5-oxo-4,5-dihydro-1H-pyrazol-1-yl) quinazolin-4(3H)-one derivativesA simple, synthesis of 2-(3-methyl-5-oxo-4, 5-dihydro-1h-pyrazol-1-yl) quinazolin-4(3H)-one 6(a-d) derivatives, an easy, clean, and economical methodology has been defined. The development of a new pathway for the preparation of substituted derivatives of Quinazoline Pyrazole is highlighted in this report. The mild, inexpensive polyphosphoric ac...
6 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 221 | Lượt tải: 0
Nitrate, nitrite, and lead contamination in leafy vegetables collected from local market sites of Go Vap district, Ho Chi Minh CityLead, nitrate, and nitrite are among the major contaminants of vegetables. These concentrations appraise the quality characteristic of vegetables. Governments and regulators has control the level of nitrate, nitrite, and lead in vegetables to protect the human health. The present study was initiated to investigate the levels of these contaminants...
8 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 242 | Lượt tải: 0
Phytochemical investigation of Eurycoma longifolia roots collected in Gia Lai province, Viet NamFrom the roots of Eurycoma longifolia, seven compounds including β-carboline-2N-oxide-1-propionic acid (1), 9,10-dimethoxycanthin-6-one (2), β-carboline-1-propionic acid (3), infractine (4), eurylene (5), eurycomanone (6), 14,15-β-hydroxyklaineanol (7) were isolated. Their structures were determined by means of spectroscopic methods (UV, IR, HR-...
6 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 173 | Lượt tải: 0
Morphology and properties of polybutylene succinic and cassava starch blend: Effect of esterification catalysts on graft copolymer formationThe purpose of this research is to produce of esterified thermoplastic starch (ETPS) for reactive extrusion meltblending with polybutylene succinate (PBS) in film blowing application. Esterification TPS named M-TPS and T-TPS were prepared from cassava starch, glycerol (plasticizer), and maleic anhydride (MA), tartaric acid (TA) as reactive compat...
8 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 226 | Lượt tải: 0
Effect of different polarity solvents on the anti-inflammatory activity of Symplocos cochinchinensis leaves and correlation with total polyphenol contentSymplocos cochinchinensis leaves known as Vietnamese traditional herbal medicines which have been utilized anciently to support the medication of infirmities. The study aimed to explore the correlation of total polyphenol content (TPC) with anti-inflammatory activity of S. cochinchinensis leaves. S. cochinchinensis leaf extracts (ethanol extract,...
9 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 274 | Lượt tải: 0
