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Lim, Jong-Hyun,Lee, Jeong-Ae,Jang, Yu-Ra,Chung, He-Sson,Lee, Won-Yong,Chung, Bong-Chul Korean Society for Mass Spectrometry 2012 Mass spectrometry letters Vol.3 No.3
Fat malabsorption is an important cause of poor growth in infancy and childhood. Steatorrhea tests have been developed using various methods. Traditional measurements of stool fat, however, require large samples and it often takes as a week to complete the analysis. In this paper, a liquid chromatography-electrospray ionization/mass spectrometry (LC-ESI/MS) method was developed for simultaneous quantitative analysis of triacylglycerols, triolein, diolein and monoolein, in mouse feces. Moreover, the procedure was rapid, simple as well as compatible with LC-ESI/MS. Chloroform-isopropyl alcohol solution was used for fat-soluble sample extraction. After centrifugation and filtration, an analytical solution was prepared. Triolein, diolein and monoolein were separated using non-aqueous reversed-phase column with the mobile phase consisting of A (methanol) and B (acetone-isopropyl alcohol). The precision (% CV) and accuracy (% bias) of the assay were 3.8-14.7% and 85.2-114.9%, respectively. This method has been successfully applied to simultaneous determination of triolein, diolein and monoolein in feces from 30 mice. This method can therefore be applied to measure triacylglycerols in mouse feces accurately and precisely by LC-ESI/MS, thereby helping to predictive biomarker in fat malabsorption and diagnostic research.
Device characteristics of inkjet-printed ZnO TFTs by solution process
Lim, Sang Chul,Koo, Jae Bon,Park, Chan Woo,Jung, Soon-Won,Na, Bock Soon,Lee, Sang Suk,Chu, Hye Yong IOP Publishing 2014 Japanese journal of applied physics Vol.53 No.5
<P>We report on solution-processed n-channel ZnO thin-film transistors. We fabricated by a low-temperature process to improve their performance using inkjet printing under various conditions. The resulting films were inkjet-printed with a resolution 200 dpi using droplets of 50 mu m diameter and 35 pl volume. The characteristics of the inkjet-printed TFTs were improved significantly at an annealing temperature of 150 degrees C. The field-effect mobility, Vth, and on/off current ratio were 3.03cm(2)V(-1) s(-1), -3.3V, and 10(6), respectively. These results indicate that annealing at 150 degrees C is sufficient to obtain a mobility (mu(sat)) as large as 3.03cm(2)V(-1) s(-1). (C) 2014 The Japan Society of Applied Physics</P>