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Abdolmajid Bayandori Moghaddam Forugh Gudarzy Yadolah Ganjkhanlou 《Journal of fluorescence》2014,24(4):1025-1030
Determination of molecules and biomolecules using nanoparticles is promising in the development of analytical techniques. Modified Eu-doped Y2O3 nanoparticles (Y2O3:Eu NPs) by captopril have been used as a probe for thiamine (vitamin B1) determination. According to the fluorescence enhancement of modified Eu-doped Y2O3 nanoparticles caused by thiamine, a simple and sensitive method were proposed for its detection. The increase in modified Y2O3:Eu NPs fluorescence signal as a function of thiamine concentration was found to be linear in the concentration range of 0–44 μM. The limit of detection (LOD) of thiamine by this method was 0.144 μM. All the measurements were performed in natural pH, at the room temperature under ambient conditions. Possible interaction mechanism was discussed. 相似文献
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Forugh Gudarzy Abdolmajid Bayandori Moghaddam Shahla Mozaffari Yadolah Ganjkhanlou Mahmood Kazemzad Reza Zahed Farhad Bani 《Mikrochimica acta》2013,180(13-14):1257-1262
We report on a novel luminescent method for the detection of folic acid (FA), a member of the vitamin B family. Y2O3 nanoparticles were doped with europium(III) ions and surface-modified with captopril. Their fluorescence is quenched by FA, and intensity is a function of folic acid concentration in the 0.1 – 40 μM concentration range. The detection limit is 83 nM of FA at pH 7 and room temperature. Figure
In this work, we propose a novel method based on the changes in the fluorescence intensity of nanoparticles. Modified Eu-doped Y2O3 nanoparticles by captopril have been used as a probe for the detection of folic acid. 相似文献
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The use of supported Cu complex on mesoporous as a novel, efficient, heterogeneous, reusable and green catalyst for the synthesis of spiro‐dihydrofuran derivatives is reported. This methodology is effective for the reaction of dimedone with a wide range of aldehyde in the presence of BrCN and triethylamine. The structure of catalyst was characterized by different techniques such as EDX, SEM, TGA, ICP‐OES, XRD, TEM, FT‐IR, and BET. The recycled nanocatalyst was used at least five times with no significant loss of its activity. 相似文献
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Synthesis and characterization of MCM‐41‐Biurea‐Pd as a heterogeneous nanocatalyst and using its catalytic efficacy in C–C,C–N and C–O coupling reactions 下载免费PDF全文
MCM‐41‐Biurea‐Pd is introduced as a new, heterogeneous and reusable catalyst for C–C and C–heteroatom bond formation between various aryl halides, phenols and amines, in the presence of Ph3SnCl (Stille reaction) in PEG‐400 as a green solvent at room temperature. The structure of the functionalized MCM‐41 was analysed using various techniques. 相似文献
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Guanidinum Chloride as Dehydrocyclization Agent in the Synthesis of 2‐Fuctionalized (4H)‐3,1‐Benzoxazine‐4‐ones 下载免费PDF全文
Farzad Nikpour Asrin Bahmani Forugh Havasi Mahnaz Sharafi‐Kolkeshvandi 《Journal of heterocyclic chemistry》2014,51(1):34-37
A facile and expedient route for the synthesis of 2‐ethoxy‐ and 2‐(ethylcarboxylate)‐(4H)‐3,1‐benzoxazine‐4‐ones is described using guanidinium chloride as a safe and convenient dehydrocyclization agent. High yields of the products obtain under mild reaction conditions without need to use of any catalyst and with easy work‐up of the reaction mixture. 相似文献
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