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Highly selective colorimetric detection of Zn(II) ions using label-free silver nanoparticles
Lee, Sujin,Nam, Yun-Sik,Lee, Ho-Jin,Lee, Yeonhee,Lee, Kang-Bong Elsevier 2016 Sensors and actuators. B Chemical Vol.237 No.-
<P><B>Abstract</B></P> <P>A simple and facile colorimetric method for the detection of zinc ions (Zn<SUP>2+</SUP>) using label-free silver nanoparticles (AgNPs) has been developed. Zn<SUP>2+</SUP> ions induced the aggregation of label-free AgNPs in solution, resulting in a color change from yellow to forest green, which was accompanied by the appearance of a new surface plasmon absorption band at 635nm. The sensitivity of label-free AgNPs towards other metal ions was negligible, with the exception of Fe<SUP>3+</SUP>, which caused a modest interference. The binding site and sensing mechanism for Zn<SUP>2+</SUP> ions in label-free AgNPs were characterized by Fourier Transform infrared spectroscopy, ultraviolet-visible spectroscopy, and transmission electron microscopy. The aggregation of AgNPs in the presence of Zn<SUP>2+</SUP> ions was inhibited by polyvinyl alcohol, which formed a shell on the surface of AgNPs. Furthermore, Zn<SUP>2+</SUP> ions coordinated with BH<SUB>4</SUB> <SUP>−</SUP> on AgNPs through a triangular sixdentate binding structure, thus inducing aggregation of AgNPs in solution.</P> <P>The sensor conditions were optimized with 6.0μM of sodium dodecylbenzenesulfonate (NaDDBS) and 0.23mM AgNPs at pH 6. The absorption ratios (A<SUB>635</SUB>/A<SUB>390</SUB>) of the label-free AgNPs solution exhibited a linear correlation with Zn<SUP>2+</SUP> ion concentration within the range of 0.0−7.6×10<SUP>−6</SUP> molL<SUP>−1</SUP>, with a limit of detection of 0.36×10<SUP>−6</SUP> molL<SUP>−1</SUP>. This cost-effective sensing system allows rapid and facile determination of Zn<SUP>2+</SUP> ions in various types of biological, mineral supplement, and environmental samples.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A facile silver nanoparticle sensor for the visual detection of Zn<SUP>2+</SUP> ion. </LI> <LI> A colorimetric Zn<SUP>2+</SUP> ion sensor using label-free silver nanoparticle. </LI> <LI> This sensor exhibits excellent selectivity for Zn<SUP>2+</SUP> ion over other metal ions. </LI> <LI> This simple sensor can detect ∼0.36×10<SUP>−6</SUP> molL<SUP>−1</SUP> concentration of Zn<SUP>2+</SUP> ion within 15min. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
( Yeonhee Lee ),( Kyung Don Yoo ),( Seon Ha Baek ),( Yang Gyun Kim ),( Hyo Jin Kim ),( Ji Young Ryu ),( Jin Hyuk Paek ),( Sang Heon Suh ),( Se Won Oh ),( Jeonghwan Lee ),( Jong Hyun Jhee ),( Jin-soon 대한전해질학회 2022 Electrolytes & Blood Pressure Vol.20 No.1
The Korean Society for Electrolyte and Blood Pressure Research, in collaboration with the Korean Society of Nephrology, has published a clinical practice guideline (CPG) document for hyponatremia treatment. The document is based on an extensive evidence-based review of the diagnosis, evaluation, and treatment of hyponatremia with the multidisciplinary participation of representative experts in hyponatremia with methodologist support for guideline development. This CPG consists of 12 recommendations (two for diagnosis, eight for treatment, and two for special situations) based on eight detailed topics and nine key questions. Each recommendation begins with statements graded by the strength of the recommendations and the quality of the evidence. Each statement is followed by rationale supporting the recommendations. The committee issued conditional recommendations in favor of rapid intermittent bolus administration of hypertonic saline in severe hyponatremia, the use of vasopressin receptor antagonists in heart failure with hypervolemic hyponatremia, and syndrome of inappropriate antidiuresis with moderate to severe hyponatremia, the individualization of desmopressin use, and strong recommendation on the administration of isotonic fluids as maintenance fluid therapy in hospitalized pediatric patients. We hope that this CPG will provide useful recommendations in practice, with the aim of providing clinical support for shared decision-making to improve patient outcomes.
Characterization of dyed textiles using TOF‐SIMS and FT‐IR
Lee, Jihye,Ceglia, A.,Kim, Kang‐,Jin,Lee, Yeonhee John Wiley Sons, Ltd 2012 Surface and interface analysis Vol.44 No.6
<P>Within the field of archeology, textile research is of growing interest because of its potential to provide relevant information regarding either the development or the technological advancement of ancient populations or the socio‐economic and religious purposes of textile production. It is of paramount importance in cultural heritage research to use non‐destructive techniques. Therefore, dye analyses were performed using two non‐destructive methods: time‐of‐flight secondary ion mass spectrometry (TOF‐SIMS) and Fourier transform infrared spectroscopy (FT‐IR). In order to build a database, standard samples of dyed silk were prepared using several natural dye compounds; these samples were then analyzed with FT‐IR and TOF‐SIMS. Afterwards, spectroscopic analyses were carried out on five textile fragments coming from the 16th to the 18th century Korean tombs. FT‐IR and TOF‐SIMS spectra allowed the identification of fiber of the archeological textiles, making it possible to distinguish between the cotton and silk fibers. Furthermore, it was possible to identify indigo in three blue fabrics and to show its presence in a green textile. The results suggest that FT‐IR and TOF‐SIMS are two efficient and very helpful techniques for the characterization of excavated fabrics. Copyright © 2011 John Wiley & Sons, Ltd.</P>
Lee Seoyoung,Ryu Yeonhee,Park Hi-Joon,Lee In-Seon,Chae Younbyoung 한국한의학연구원 2022 Integrative Medicine Research Vol.11 No.2
Background: An unbiased assessment of clinical outcomes may provide greater insight into the characteristics of individual acupoints. In this study, we used machine-learning methods to examine clinical trial data for diseases treated using prescribed five-phase acupoint patterns. Methods: We performed a search of acupuncture treatment regimens used in randomized controlled trials included in the Cochrane Database of Systematic Reviews. The frequencies of 60 five-phase acupoints were calculated based on 421 clinical trials on 30 diseases. The characteristics of prescribed five-phase acupoints were further analyzed using multidimensional scaling and K-means clustering. Results: Among the five-phase acupoints, stream and sea acupoints were the most widely used, with well, spring, and river acupoints less common. Multidimensional scaling and cluster analysis revealed that the LR3, ST36, GB34, BL60, KI3, LI11, and HT7 acupoints exhibited distinct characteristics based on distances representing the similarity between acupoint indications. Conclusions: The results suggest that stream and sea acupoints exhibit distinct characteristics compared to the other acupoints. Such data-driven approaches will improve our understanding of five-phase acupoints and facilitate the establishment of new models of analysis and educational resources for major acupoint characteristics.