Đồ án, luận văn, do an, luan van

Essential oils of Tunisian Pinus radiata D. Don, chemical composition and study of their herbicidal activity
Little 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: 532 | Lượt tải: 0
Isolation of lignans and neolignans from Pouzolzia sanguinea with their cytotoxic activity
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. T...
7 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 521 | Lượt tải: 0
Synthesis of 2-(3-methyl-5-oxo-4,5-dihydro-1H-pyrazol-1-yl) quinazolin-4(3H)-one derivatives
A 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: 389 | Lượt tải: 0
Nitrate, nitrite, and lead contamination in leafy vegetables collected from local market sites of Go Vap district, Ho Chi Minh City
Lead, 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: 484 | Lượt tải: 0
Phytochemical investigation of Eurycoma longifolia roots collected in Gia Lai province, Viet Nam
From 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: 352 | Lượt tải: 0
Morphology and properties of polybutylene succinic and cassava starch blend: Effect of esterification catalysts on graft copolymer formation
The 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: 475 | Lượt tải: 0
Effect of different polarity solvents on the anti-inflammatory activity of Symplocos cochinchinensis leaves and correlation with total polyphenol content
Symplocos 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: 474 | Lượt tải: 0
SERS chemical enhancement by copper - Nanostructures: Theoretical study of Thiram pesticide adsorbed on Cu₂₀ cluster
Surface-enhanced Raman spectroscopy (SERS), a surface-sensitive technique, allows the practicability of detecting chemical compounds in ultra-low concentration. In this work, a chemical enhancement mechanism of SER process of Thiram pesticide adsorbed on copper nanomaterial surface was proposed based on density functional theory (DFT) approaches...
8 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 392 | Lượt tải: 0
Flavonoids and phenolics from the wholeplant of Macrosolen bidoupensis Tangane & V.S. Dang
Five flavonoids, including quercetin (1) and four its derivatives, quercitrin (2), isoquercitrin (3), astibin (4), and rutin (5), together with two phenolic glycosides, 3,3′-di-O-methylellagic acid 4-O-β-D-xylopyranoside (6), and aesculin (7) were isolated from the whole plants of Macrosolen bidoupensis Tangane & V.S. Dang. Their chemical structu...
5 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 360 | Lượt tải: 0
An efficient synthesis, characterization and docking studies of 2-methoxy-3-(1-substituted-1H-pyrazol-3-yl)quinoxalines
Quinoxaline subsidiaries are a significant class of nitrogen-containing heterocycles, as they establish helpful intermediates in organic synthesis. This substructure plays a significant role as an essential skeleton for the plan of various heterocyclic compounds with various biological activities, hence thesecompounds significant in the field...
6 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 784 | Lượt tải: 0