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Noh, Yuseon,Jo, Eun-Jung,Mun, Hyoyoung,Ahn, Young-deok,Kim, Min-Gon Elsevier 2017 CHEMOSPHERE - Vol.174 No.-
<P><B>Abstract</B></P> <P>We synthesized fluorescent Cd nanoclusters (CdNCs) through a protein-directed method, and the synthesis method was utilized for a homogeneous, ultrasensitive, and selective detection of cadmium ion (Cd<SUP>2+</SUP>). CdNCs were synthesized using a modified protein-directed method for developing a rapid Cd<SUP>2+</SUP> detection system. For rapid Cd<SUP>2+</SUP> detection, the reaction time was reduced by optimizing the reaction conditions such as temperature, reducing agent concentration, and protein concentration. The synthesized CdNCs had <I>ca</I>. 2 nm diameter and showed strong fluorescence at 485 nm under 365 nm UV light. The fluorescence of the CdNCs increased with increasing Cd<SUP>2+</SUP> concentrations, and the limit of detection in deionized water was 15.68 fM. This method enables the detection of Cd<SUP>2+</SUP> through the Cd concentration-dependent formation of fluorescent CdNCs in tap, fountain, and pond water samples with detection limits of 0.75, 7.65, and 48.2 fM, respectively. The sensitivity and specificity of our method are comparable to those of several existing methods for Cd<SUP>2+</SUP> detection. Furthermore, the system enables the homogeneous detection of Cd<SUP>2+</SUP> without separation and washing, thereby broadening its application in analytical chemistry.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The reaction time was reduced by optimizing reaction conditions. </LI> <LI> The fluorescence intensity of cadmium nanoclusters increased with increasing concentrations of cadmium ions. </LI> <LI> This is a homogeneous, ultrasensitive, and highly-selective method. </LI> </UL> </P>
JiEun LEE,SungHwa OH,YuSeon NOH,JiHun SEOK,YongJoo KIM,YoungSu JANG 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Microcapsules could be used in cosmetics, pharmaceutical, quasi drugs and medical applications. Poly(ϵ-caprolactone) (PCL), a biodegradable and biocompatible polymer is useful to encapsulate a wide range of drugs making it material for the preparation of carriers with potential applications in therapeutics. Poly(ϵ-caprolactone) microcapusules containing Scolopedera subspinipes Extract were prepared by solvent evaporation method. Poly(vinyl alcohol) was used as a emulsifier and dichloromethane was used as a solvent for PCL and Scolopedera subspinipes Extract. Image analyzer and scanning electron microscope (SEM) were used to observe the shape and surface of microcapsule. Thermal behaviors were studied by using a differential scanning calorimetry (DSC). The partical size of microcapsules were measured by PSA(particle size analyzer). Specific peaks of Scolopedera subspinipes Extract in microcapsules were confirmed using FT-IR spectra.
Whitening Effects of GC/MS Components from Scolopendra subspinipes mutilans Fractions
JiEun LEE,SungHwa OH,YuSeon NOH,JiHun SEOK,YongJoo KIM,YoungSu JANG 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
This study was performed to determine the whitening effect of several solvent fractions of Scolopedra subspinipes mutilans(SSM) extracts. Fractions from ethanol and distilled water extracts of SSM were prepared by a systematic fractionation procedure using n-hexane, chloroform, ethyl acetate, n-butanol and d.w. Also, Cholroform, ethyl acetate and n-hexane extractions of SSM were analyzed by gas chromatography-mass spectrometry (GC-MS). The results demonstrated that 4 components were identified totally in samples, and 4-Hydroxyphenyl acetic acid(4-HPAA) was confirmed as a selective component for whitening effect and melanin synthesis in B16F10 melanoma cells. The 4-HPAA showed the tyrosinase inhibition activity to 77.34% and concentration-dependent. These results showed that fractions from SSM and 4-HPAA could be developed as a skin whitening material in cosmetics.
Kim, Seong U,Jo, Eun-Jung,Noh, Yuseon,Mun, Hyoyoung,Ahn, Young-Deok,Kim, Min-Gon American Chemical Society 2018 ANALYTICAL CHEMISTRY - Vol.90 No.17
<P>Bacterial infections are common causes of morbidity and mortality worldwide; therefore, environmental contamination by bacterial pathogens represents a global public health concern. Consequently, a selective, rapid, sensitive, and in-field detection platform for detecting significant bacterial contamination is required to ensure hygiene and protect public health. Here, we developed a fast and simple platform for the selective and sensitive detection of bacteria by measuring adenosine triphosphate (ATP) bioluminescence following targeted photothermal lysis mediated by antibody-conjugated gold nanorods. This method employed both targeted photothermal lysis of bacteria by near-infrared (NIR) irradiation and highly selective detection of the lysed bacteria via ATP bioluminescence within 36 min (incubation, 30 min; NIR irradiation, 6 min). The use of the proposed method allowed limits of detection in pure solution of 12.7, 70.7, and 5.9 CFU for <I>Escherichia coli</I> O157:H7, <I>Salmonella typhimurium</I>, and <I>Listeria monocytogenes</I>, respectively. Additionally, bacteria were successfully detected on artificially inoculated plastic cutting boards. Furthermore, this method was highly specific, without cross-reaction among pathogenic bacteria. We believe that the proposed method has significant potential as an on-site diagnostic tool for applications associated with public health and environmental pollution monitoring.</P> [FIG OMISSION]</BR>