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퀘쳐스 전처리와 질량분석기를 이용한 논과 밭 토양 중 463종 다성분 분석법 정립 및 검증
백은주 ( Eunjoo Baek ),박혜진 ( Hyejin Park ),임채욱 ( Chaiuk Lim ),신병곤 ( Byeung Gon Shin ),조순길 ( Soon-kil Cho ),홍성희 ( Sung-hee Hong ) 한국환경농학회 2022 한국환경농학회 학술대회집 Vol.2022 No.-
Residual pesticides remaining in the soil may be absorbed and transferred to crops, causing unintentional contamination of agricultural products. So, proper management of the cultivation environment such as soils must be preceded. It is necessary to establish an analytical method to accurately and reliably analyze residual pesticides in paddy and unpland soils. In this study, a QuEChERS method for simultaneous determination of 463 pesticide residues in paddy and upland soils was developed and validated. Soil samples were extracted using a modified QuEChERS.. And then targeted pesticides were purified following the dispersive solid phase extraction(d-SPE, PSA) cleanup method and detected by liquid and gas chromatography-tandem mass spectrometry(LC-MS/MS and GC-MS/MS). To evaluate performance of the method, validation experiments were carried out on paddy and unpland soils at three spiking levels (0.01, 0.05, 0.1 mg kg<sup>-1</sup>). The recoveries of the paddy soil ranged between 70.15 and 120.0% with associated relative standard deviations(RSD) less than 22% for the 445 pesticides. The recoveries of the unpland soil ranged between 70.62 and 115.5% with associated relative standard deviations(RSD) less than 22% for the 449 pesticides. The limit of quantification (LOQ) of methods were below 0.01 mg/kg<sup>-1</sup>, and the coefficient of determination (R<sup>2</sup>) of matrix-matched standards were > 0.997. In order for the developed method to be certified as an analytical method determined by the head of NAQs, cross-validation of the three labs is in progress.
C-Reactive protein-directed immobilization of phosphocholine ligands on a solid surface
Kim, Eunjoo,Kim, Hyun-Chul,Lee, Se Geun,Lee, Sung Jun,Go, Tae-Jung,Baek, Chul Su,Jeong, Sang Won Royal Society of Chemistry 2011 Chemical communications Vol.47 No.43
<P>The complexes of C-reactive protein (CRP) with its polymerizable phosphocholine ligands adsorbed at the styrene–water interface were polymerized. The molecularly imprinted polymer (MIP) exhibited a binding affinity for CRP comparable to that of immobilized anti-CRP antibody. The determination of human serum CRP using the MIP-based sandwich immunoassay has been demonstrated.</P> <P>Graphic Abstract</P><P>The surface molecular imprinting of multivalent proteins was demonstrated using C-reactive protein with its polymerizable ligands adsorbed at the oil–water interface. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1cc15079k'> </P>
Kim, Eunjoo,Kang, Changjoon,Baek, Heeyoel,Hwang, Kyosung,Kwak, Dongwoo,Lee, Eunkyung,Kang, Youngjong,Thomas, Edwin L. WILEY‐VCH Verlag 2010 Advanced Functional Materials Vol.20 No.11
<P><B>Abstract</B></P><P>Polystyrene‐<I>block</I>‐poly(2‐vinyl pyridine) (PS‐<I>b</I>‐P2VP) block copolymer photonic gels are fabricated that exhibit controllable optical hysteresis in response to a cyclic pH sweep. The optical hysteresis is tuned by controlling the ion‐pairing affinity between various anions and the protonated pyridinium ions on the P2VP block, which is highly dependent on the hydration energy of the ions, the dielectric constant of the solvent, and the ionic strength of the medium. The pH coercivity defining the magnitude of hysteresis of the photonic gels could be varied from 0.26 to 7.4. Photonic gel films with strong optical hysteresis can serve as wet photonic memory films where information can be cyclically recorded and erased at least 15 times and maintained for at least 96 h. The memory colors can be further tuned by selection of the copolymer molecular weight.</P>
Kim, Eunjoo,Lee, Se Geun,Kim, Hyun-Chul,Lee, Sung Jun,Baek, Chul Su,Jeong, Sang Won Bentham Science Publishers 2013 Current topics in medicinal chemistry Vol.13 No.4
<P>The preparation of a synthetic receptor for multivalent protein binding by a directed immobilization of bifunctional ligands was demonstrated using pentameric C-reactive protein (CRP) and a thiolated phosphocholine-containing ligand on a gold surface. CRP consisting of five identical, noncovalently linked subunits and having five phosphocholine-binding sites on the same face was complexed with 12-mercaptododecylphosphocholine. The complexes were reacted with a gold surface, which was blocked with BSA or 2-mercaptoethanol to avoid non-specific binding. CRP binding to the molecularly imprinted monolayer was investigated by surface plasmon resonance, exhibiting high sensitivity with a detection limit as low as 1 pM (0.12 ng/mL) and binding affinity (K(A) ~ 10(-7)-10(-9) M(-1)) comparable to that of immobilized anti- CRP.</P>