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Hu, Liqin,Zhou, Tingting,Feng, Jingwen,Jin, Hua,Tao, Yun,Luo, Dan,Mei, Surong,Lee, Yong-Ill Elsevier 2018 Journal of Electroanalytical Chemistry Vol.813 No.-
<P><B>Abstract</B></P> <P>Azithromycin (AZM) is a widely used macrolide antibiotic to treat infections caused by bacteria. Considering the side-effect to human health, a rapid and selective electrochemiluminescence (ECL) sensor was fabricated on the basis of molecularly imprinted polymer (MIP) modified carbon paste electrode as a recognition element. We systematically optimized the factors influencing the processes on the extraction and determination for AZM, including the amount of MIP power and paraffin oil, extraction solution, extraction time and the pH of Ru(bpy)<SUB>3</SUB> <SUP>2+</SUP> solution. Under the optimal condition, the wide linear range was observed from 1.0 × 10<SUP>−10</SUP> to 4.0 × 10<SUP>−7</SUP> mol L<SUP>−1</SUP>, and the limit of detection (LOD) was low as 2.3 × 10<SUP>−11</SUP> mol L<SUP>−1</SUP> (S/N = 3). The spiked recoveries of AZM in urine and blood samples were from 98.4% to 113.5% with RSD changing from 3.7% to 13.2%, respectively. The results of AZM determination by this proposed sensor were in accordance with that of high-performance liquid chromatography–tandem mass spectrometry method. Thus, the developed MIP-based ECL sensor will have a great potential application in rapid and sensitive determination of trace AZM in complex biological samples.</P> <P><B>Highlights</B></P> <P> <UL> <LI> ECL sensor </LI> <LI> MIP modified CP electrode </LI> <LI> Trace AZM determined in biological samples </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Cha, Hyeong-Rae,Babu, V. Ramesh,Rao, K.S.V. Krishna,Kim, Yong-Hyun,Mei, Surong,Joo, Woo-Hong,Lee, Yong-Ill Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.10
New silver nanoparticle (AgNP)-loaded amino acid based hydrogels were synthesized successfully from poly (vinyl alcohol) (PVA) and poly(acryl amide-co-acryloyl phenyl alanine) (PAA) by redox polymerization. The formation of AgNP in hydrogels was confirmed by using a UV-Vis spectrophotometer and XRD. The structure and morphology of silver nanocomposite hydrogels were studied by using a scanning electron microscopy (SEM), which demonstrated scattered nanoparticles, ca. 10-20 nm. Thermogravimetric analysis revealed large differences of weight loss (i.e., 48%) between the prestine hydrogel and silver nanocomposite. The antibacterial studies of AgNP-loaded PAA (Ag-PAA) hydrogels was evaluated against Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive) bacteria. These Ag-PAA hydrogels showed significant activities against all the test bacteria. Newly developed hydrogels could be used for medical applications, such as artificial burn dressings.
Hyeong-Rae Cha,V. Ramesh Babu,K. S. V. Krishna Rao,Yong-Hyun Kim,Surong Mei,주우홍,이용일 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.10
New silver nanoparticle (AgNP)-loaded amino acid based hydrogels were synthesized successfully from poly (vinyl alcohol) (PVA) and poly(acryl amide-co-acryloyl phenyl alanine) (PAA) by redox polymerization. The formation of AgNP in hydrogels was confirmed by using a UV-Vis spectrophotometer and XRD. The structure and morphology of silver nanocomposite hydrogels were studied by using a scanning electron microscopy (SEM), which demonstrated scattered nanoparticles, ca. 10-20 nm. Thermogravimetric analysis revealed large differences of weight loss (i.e., 48%) between the prestine hydrogel and silver nanocomposite. The antibacterial studies of AgNP-loaded PAA (Ag-PAA) hydrogels was evaluated against Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive) bacteria. These Ag-PAA hydrogels showed significant activities against all the test bacteria. Newly developed hydrogels could be used for medical applications, such as artificial burn dressings.