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Jinbong Hwang,Hae Won Jang,Bae Namgung,Mira Oh,Soyoung Kim,Dongwon Seo,Se-Na Kim,Youngmin Choi,Jin-Sik Nam,Mi-Ok Yang 한국산업식품공학회 2015 산업 식품공학 Vol.19 No.2
The analytical method for the determination of phosphorus in foods was validated by inductively coupled plasma optical emission spectrometry (ICP-OES) in terms of precision, accuracy, recovery efficiency and linearity. Regression analysis revealed good correlation coefficient, higher than 0.999. Recovery efficiencies of the minerals ranged from 90.36% to 110.63%, and the limit of detection (LOD) and the limit of quantification (LOQ) were 0.0745 mg/ kg and 0.2482 mg/kg, respectively. The value of inter-day and intra-day ranged from 1.43 to 3.23% and from 0.40 to 1.77%. The recovery efficiencies ranged from 97.8 to 110.6%. The method was also compared with Molybdenum blue colorimetric method using certified and statistically significant difference was also not observed in the between two different analytical methods. The ICP-OES method was applied to phosphorus determination in commonly consumed foods. The obtained results suggest that the method verified in the present study may be used as an official analytical method for clear understanding of phosphorus database for national health promotion.
( Jinbong Hwang ),( Hae Won Jang ),( Bae Namgung ),( Mira Oh ),( Soyoung Kim ),( Dongwon Seo ),( Se Na Kim ),( Youngmin Choi ),( Jin Sik Nam ),( Mi Ok Yang ) 한국산업식품공학회 2015 산업 식품공학 Vol.19 No.2
The analytical method for the determination of phosphorus in foods was validated by inductively coupled plasma optical emission spectrometry (ICP-OES) in terms of precision, accuracy, recovery efficiency and linearity. Regression analysis revealed good correlation coefficient, higher than 0.999. Recovery efficiencies of the minerals ranged from 90.36% to 110.63%, and the limit of detection (LOD) and the limit of quantification (LOQ) were 0.0745 mg/ kg and 0.2482 mg/kg, respectively. The value of inter-day and intra-day ranged from 1.43 to 3.23% and from 0.40 to 1.77%. The recovery efficiencies ranged from 97.8 to 110.6%. The method was also compared with Molybdenum blue colorimetric method using certified and statistically significant difference was also not observed in the between two different analytical methods. The ICP-OES method was applied to phosphorus determination in commonly consumed foods. The obtained results suggest that the method verified in the present study may be used as an official analytical method for clear understanding of phosphorus database for national health promotion.
황진봉,정혜원,Namgung, Mira Oh,김소영,서동원,김세나,최영민,남진식,양미옥 한국산업식품공학회 2015 산업 식품공학 Vol.19 No.2
The analytical method for the determination of phosphorus in foods was validated by inductively coupled plasma optical emission spectrometry (ICP-OES) in terms of precision, accuracy, recovery efficiency and linearity. Regression analysis revealed good correlation coefficient, higher than 0.999. Recovery efficiencies of the minerals ranged from 90.36% to 110.63%, and the limit of detection (LOD) and the limit of quantification (LOQ) were 0.0745 mg/ kg and 0.2482 mg/kg, respectively. The value of inter-day and intra-day ranged from 1.43 to 3.23% and from 0.40 to 1.77%. The recovery efficiencies ranged from 97.8 to 110.6%. The method was also compared with Molybdenum blue colorimetric method using certified and statistically significant difference was also not observed in the between two different analytical methods. The ICP-OES method was applied to phosphorus determination in commonly consumed foods. The obtained results suggest that the method verified in the present study may be used as an official analytical method for clear understanding of phosphorus database for national health promotion.
생물 유기분자 유도 실리카 합성실험을 통한 생체내 유무기 복합체 형성이해
기미란,민기하,백승필 한국생물공학회 2019 KSBB Journal Vol.34 No.4
The discovery of the principle molecules involved in biosilicification both in diatoms and sponges brings out a new paradigm for silica synthesis at environmentally benign conditions. Here we introduce the biosynthetic method of silica using organic molecules for the undergraduate students. First, the biosilica synthesized was assessed through both a colorimetric method for quantification of silica and structural analysis by SEM image observation. Next, facile immobilization of an enzyme was demonstrated. Specifically, bovine carbonic anhydrase II (bCAII) was efficiently immobilized within silica matrix by simply adding itself to the reaction mixture containing polyamines and tetramethyl orthosilicate in phosphate buffer, obtaining 97% immobilization to initial amount of bCAII. The immobilized bCAII retained 40% of initial activity at 90℃ whereas free form did less than 10% of initial activity at 70℃ and the total yield from the 5 times reuses of immobilized bCAII was twice that of free bCAII. This experimental content that is hard to find in general biology or biochemistry lab could contribute to students' interest in knowledge expansion and application of new materials.
Jeong, Yeon Hun,Oh, Kyeongmin,Ahn, Sungha,Kim, Na Young,Byeon, Ayeong,Park, Hee-Young,Lee, So Young,Park, Hyun S.,Yoo, Sung Jong,Jang, Jong Hyun,Kim, Hyoung-Juhn,Ju, Hyunchul,Kim, Jin Young Elsevier 2017 Journal of Power Sources Vol.363 No.-
<P><B>Abstract</B></P> <P>Precise monitoring of electrolyte leaching in high-temperature polymer electrolyte membrane fuel cell (HT-PEMFC) devices during lifetime tests is helpful in making a diagnosis of their quality changes and analyzing their electrochemical performance degradation. Here, we investigate electrolyte leaching in the performance degradation of phosphoric acid (PA)-doped polybenzimidazole (PBI) membrane-based HT-PEMFCs. We first perform quantitative analyses to measure PA leakage during cell operation by spectrophotometric means, and a higher PA leakage rate is detected when the current density is elevated in the cell. Second, long-term degradation tests under various current densities of the cells and electrochemical impedance spectroscopy (EIS) analysis are performed to examine the influence of PA loss on the membrane and electrodes during cell performance degradation. The combined results indicate that PA leakage affect cell performance durability, mostly due to an increase in charge transfer resistance and a decrease in the electrochemical surface area (ECSA) of the electrodes. Additionally, a three-dimensional (3-D) HT-PEMFC model is applied to a real-scale experimental cell, and is successfully validated against the polarization curves measured during various long-term experiments. The simulation results highlight that the PA loss from the cathode catalyst layer (CL) is a significant contributor to overall performance degradation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The influences of electrolyte leakage on the performance of HT-PEMFC were studied. </LI> <LI> We evaluated PA leakage during the cell operation with a colorimetric detection. </LI> <LI> The higher PA leakage was observed at operation at elevated current densities. </LI> <LI> The PA loss from cell operation caused long-term performance degradation. </LI> <LI> The degradation mechanisms were investigated. </LI> </UL> </P>