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- 저자 : Sahar S. Mohamed (검색결과 3 건)
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Fatma Abdelghaffar,Manal G. Mahmoud,Mohsen S. Asker,Sahar S. Mohamed 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.99 No.-
Linen fabrics, one of the oldest natural cellulose fabrics, lack the functional properties for the medicalgarments that can be acquired using the green synthesis of silver nanoparticles. Therefore, the currentstudy presents a statistical design for one-pot green synthesis of silver nanoparticles (AgNPs) under UVlight using the natural polysaccharide (BSEPS) produced by Bacillus subtilis sp. suppress. The Taguchimethod was used to evaluate the optimal green synthesis of AgNPs, and obtain smaller nanoparticlessizes, by three effective factors, AgNO3 concentration, BSEPS concentration, and pH. In addition, thedeposition of AgNPs capped with BSEPS was investigated onto linen to promote antibacterial activity,functional surface properties, and dyeability. FTIR, XRD, TEM, SEM, and EDX have confirmed thefabrication and deposition of AgNPs on linen fabrics. BSEPS/AgNPs fabricating shows positive results forantibacterial activities against E. coli and S. aureus for linen fabrics, both undyed and dyed. The resultsrevealed that BSEPS/AgNPs played a dual role in reducing bacterial activity and increasing dyeability.
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Synthesis of Some New 4,5-dihydro-6-(4-methoxy-3-methylphenyl)-3(2H)-pyridazinone Derivatives
Soliman, Mohamed H. A.,El-Sakka, Sahar S. Korean Chemical Society 2011 대한화학회지 Vol.55 No.2
4,5-Dihydro-6-(4-methoxy-3-methylphenyl)-3(2H)-pyridazinone derivative계 화합물의 합성연구를 수행하였다. 첫 번째로, 4,5-dihydro-6-(4-methoxy-3-methylphenyl)-3(2H)-pyridazinone (1)은 o-cresyl methyl ether와 succinic anhydride를 Friedel-Crafts 아실화 반응을 통하여 얻은 다음에, 고리화 반응을 통하여 합성하였다. 얻어진 화합물 1을, NaOEt조건 하에서, 방향족 알데히드와 반응시켜서 4-substituted benzyl pyridazinones (3a-d)을 합성하였으며, 화합물 1을 탈수소화반응을 시켜서 화합물 4를 얻었다. 한편 pyridazine 5는 화합물 1과 1,3-diphenyl-2-propen-1-one을 Michael 첨가반응을 이용하여 합성하였다. N-Dialkylaminomethyl 화합물 6a-b는 pyridazinone 1과 formaldehyde 및 2차 amine을 바능시켜서 얻은 반면에, 화합물 7은 pyridazinone 1을 반응시켜서 얻었으며, 화합물 8은 pyridazinone 3b를 phosphorus oxychloride 와 반응시켜서 얻었다. The present study describes the synthesis of 4,5-dihydro-6-(4-methoxy-3-methylphenyl)-3(2H)-pyridazinone derivatives. The synthesis of the first target compound, 4,5-dihydro-6-(4-methoxy-3-methylphenyl)-3(2H)-pyridazinone (1), was achieved by Friedel-Crafts acylation of o-cresyl methyl ether with succinic anhydride and subsequent cyclization of the intermediary g-keto acid with hydrazine hydrate. Condensation of compound 1 with aromatic aldehydes in the presence of sodium ethoxide affords the corresponding 4-substituted benzyl pyridazinones (3a-d). The dihydropyridazinone 1 underwent dehydrogenation upon treatment with bromine/acetic acid mixture to give (4). Pyridazine (5) has been synthesized upon the reaction of pyridazinone (1) with 1,3-diphenyl-2-propen-1-one under the Michael addition reaction. N-dialkylaminomethyl derivatives 6a-b have been obtained from the reaction of pyridazinone 1 with formaldehyde and secondary amine, whereas reaction of 1 with formaldehyde gives N-hydroxymethyl derivative (7). This study also includes the synthesis of the 3-chloropyridazine derivative 8 in excellent yield by heating pyridazinone 3b in phosphorus oxychloride. The behaviour of the chloro derivative toward sodium azide, benzyl amine and anthranilic acid was also studied. The proposed structures of the products were confirmed by elemental analysis, spectral data and chemical evidence.
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Fatma M. Abdel Bar,Dina S. Ibrahim,Sahar R. Gedara,Mohammed S. Abdel-Raziq,Ahmed M. Zaghloul 한국생약학회 2018 Natural Product Sciences Vol.24 No.4
The root-knot nematode, Meloidogyne incognita caused a serious damage to many plants. The phenolic components of the leaves of Schinus terebinthifolius were investigated as potential nematicidal agents for M. incognita. Nine compounds were isolated and characterized as viz., 1,2,3,4,6-pentagalloyl glucose (1), kaempferol-3-O-a-L-rhamnoside (Afzelin) (2), quercetin-3-O-a-L-rhamnoside (Quercetrin) (3), myricetin (4), myricetin-3-O-a-L-rhamnoside (Myricetrin) (5), methylgallate (6), protocatechuic acid (7), quercetin (8), and gallic acid (9) using nuclear magnetic resonance (NMR) spectroscopy. Compound 1 showed pronounced nematicidal activity compared to Oxamyl as a positive control. It showed the lowest eggs-hatchability (34%) and the highest mortality in nematode population (21% after 72 hours of treatment) at a concentration of 200 mg/mL. It exhibited the best suppressed total nematode population, root galling and number of eggmasses in infected tomato plants. The total carbohydrates and proteins were also significantly induced by 1 with reduction in total phenolics and increase in defense-related proteins. Thus, compound 1 could be a promising, more safe and effective natural nematicidal agent for the control of root-knot nematodes.
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