Vietnam Journal of Chemistry

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Flavonoit glycosit từ cây cách thư Poilanei Fissistigma poilanei (Ast) Tsiang & P. T. Li], họ na (Annonaceae)
Vietnam Journal of Chemistry - Tập 47 Số 4 - 2012
Three flavonoid glycosides: (2R,3R)-3’,4’,5,7-tetrahydroxydihydroflavonol-3-O-a-L rhamnopyranoside (1), (+)-catechin 3-O-a-L-rhamnopyranoside (2) and quercetine 3,7 dimethoxy-3’-O-a-L-rhamnopyranosyl-(1®2)-b-D-glucopyranoside  (3) were isolated from the ethyl acetate extract of Fissistigma poilanei. Their structures were elucidated by analysis of MS and NMR spectra and comparison with the publishe...... hiện toàn bộ
Synthesis and antibacterial activities of some novel hybrid compounds based on 2‐mercapto‐3‐arylquinazolin‐4(3H)‐one scaffold bearing specific coumarin
Vietnam Journal of Chemistry - Tập 61 Số S2 - Trang 131-136 - 2023
Linh Bui Thi Thuy, Phuoc Le Thien, Chi–Hien Dang, Hai Ha Pham Thi, Cong Tien Nguyen
AbstractTwo series of novel hybrid compounds, in which a variety of 2‐mercapto‐3‐arylquinazolin‐4(3H)‐ones (3a‐d)/6‐bromo‐2‐mercapto‐3‐phenylquinazolin‐4(3H)‐one (9) act as fundamental moieties are incorporated in particular 3‐(2‐bromoacetyl)‐2H... hiện toàn bộ
Diterpenoid mới được phân lập từ cây thuốc giấu Euphorbia tithymaloides (P.).
Vietnam Journal of Chemistry - Tập 54 Số 3 - Trang 274 - 2016
Cầm Thị Ính, Nguyễn Thị Hồng Vân, Phạm Minh Quân, Trần Thị Quỳnh Trang, Trịnh Anh Viên, Nguyễn Thị Thuỷ, Đỗ Thị Thảo
A new compound 1α,13β,14α-trihydroxy-3β-benzoyloxy-7β-methoxy-9β,15β-diacetoxyjatrophan-5,11E-dien (1), and two known compounds poly-O-acylated jatrophan diterpenoids (2, 3) were isolated and identified from Euphorbia tithymaloides (P.). Their structures were elucidated by spectroscopic methods and comparison with the reported data. Compound 1 showed good cytotoxicity against four cancer lines. Ke...... hiện toàn bộ
Nghiên cứu chế tạo vật liệu nanocompozit trên cơ sở nhựa epoxy DER 331 và nanoclay. Phần 1. Nghiên cứu chế độ phân tán nanoclay vào nhựa epoxy, ảnh hưởng của hàm lượng nanoclay đến tính chất cơ học của vật liệu.
Vietnam Journal of Chemistry - Tập 52 Số 1 - 2014
In this paper, the influence of dispersion methods on dispersion degree of nanoclay in epoxy matrix was studied. The dispersion degree of nanoclay was evaluated by various, method, namely XRD, viscosity measurement and TEM techniques. The results showed that high speed stirring (2000 rpm) may create the interchalated structure of nanoclay in matrix: the d-spacing of I28E increased from 23.33 Å to ...... hiện toàn bộ
CYANIDE DETECTION ABILITY OF THE PbO2 ELECTRODE SYNTHESIZED BY PULSED CURRENT METHOD
Vietnam Journal of Chemistry - Tập 49 Số 2 - 2012
Duong Thi Doan, Phan Thi Binh, Mai Thi Thanh Thuy, Nguyen Van Toan
Lead dioxide electrode was prepared by pulsed current method on stainless steel (pulse height: 30 mA/cm2, pulse width: 1 s, Q = 5100 mAs) from solution of 0.5 M HNO3 + 0.5 M Pb(NO3)2 + 0.05 M Cu(NO3)2 at  room temperature. The electro-catalytic oxidation of cyanide on PbO2 was investigated by potentiodynamic method at different scan rates in medium of 0.1 M NaOH. The result showed that PbO2 can el...... hiện toàn bộ
Recovery of L-lactic acid from fermantaion broth by using strong anionic resin.
Vietnam Journal of Chemistry - Tập 48 Số 5 - 2012
The technique of ion exchange for separation of lactic acid from fermentation broth is used in our study. The ion exchange resin used is a strong anionic resin, a product of Jacobi Carbons Company, Italy (trade name is Resinex A-4). The process at laboratory scale is realized in a chromatographic column with dimensions d x h = 10mm x 110mm which contains 6 g of anionic resin. Two solvents used are...... hiện toàn bộ
Nghiên cứu ảnh hưởng của điều kiện chế tạo đến sự phân bố Pt trong các xúc tác Pt/gamma-Al2O3
Vietnam Journal of Chemistry - Tập 45 Số 3 - 2012
In the Pt/γ-Al2O3catalysts, the distribution of uniform, small particle-size Pt metal on the carrier with high surface area of metal will result in high catalytic activities and will economize noble metals. The distribution of metal depends on the technology of preparation and post-preparation. The influences of the impregnating, drying, calcining and reducing on the distribution of metal have bee...... hiện toàn bộ
Nghiên cứu quy trình tổng hợp dietylferrocen
Vietnam Journal of Chemistry - Tập 52 Số 3 - 2014
Diethyl ferrocene is an important additive used in producing missile fuel. It plays role as a combustive catalyst in fuel component, it can enhance combustive rate of fuel from 2 to 3 times when its content is used from 1.5 to 2.5 wt%. In this paper, we report some results in synthesizing diethyl ferrocene. Its structure was confirmed by IR, 1H-, 13C-NMR and MS spectra. Its specifications were als...... hiện toàn bộ
Phenolic glycosides from Antidesma ghaesembilla
Vietnam Journal of Chemistry - Tập 54 Số 2 - Trang 170 - 2016
Le Canh Viet Cuong, Do Thi Trang, Nguyen Xuan Nhiem, Pham Hai Yen, Bui Huu Tai, Hoang Le Tuan Anh, Le Mai Huong, Nguyen Quoc Binh, Chau Van Minh, Phan Van Kiem
Five phenolic glycosides, vanillyl alcohol 4-O-β-D-glucopyranoside, 4-hydroxy-3,5-dimethoxybenzyl-O-β-D-glucopyranoside, 3-hydroxy-4,5-dimethoxyphenyl-O-β-D-glucopyranoside, 3,4,5-trimethoxyphenyl-O-β-D-glucopyranoside, and sinapyl alcohol 4-O-β-D-glucopyranoside (1-5), respectively were isolated from the methanol extract of the Antidesma ghaesembilla leaves. Their structures were elucidated by sp...... hiện toàn bộ
#Antidesma ghaesembilla #Euphorbiaceae #phenolic.
Khả năng hấp phụ crom(III) bằng vật liệu compozit polyanilin-lignin
Vietnam Journal of Chemistry - Tập 54 Số 5 - Trang 575 - 2016
Nguyễn Ngọc Thanh, Bùi Thị Phương Thảo, Nguyễn Văn Hùng, Đường Khánh Linh, Dương Thị Huyền Hải, Nguyễn Thị Nga, Trần Thị Thanh Vân, Vũ Quốc Trung
Polyaniline-lignin composite were prepared by polymerization of aniline in the presence of lignin using (NH4)2S2O8 as oxidant. Properties of the obtained polyaniline-lignin composite were studied by FT-IR spectra, thermal gravimetric analysis (TGA) and scanning electron microscopy (SEM). Results on absorption of Cr(III) by polyaniline-lignin composite showed the optimal absorption conditions of Cr...... hiện toàn bộ
#Polyaniline #lignin #grafted copolymer #cromium absorption.
Tổng số: 851   
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