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Optimization in Detecting Multiply-charged Protein Ions using MALDI TOF-MS
( Jihyeon Lee ),( Jangmi Hong ),( Taehee Kim ),( Jeongkwon Kim ) 한국질량분석학회 2013 Mass spectrometry letters Vol.4 No.1
The effects of trifluoroacetic acid (TFA) were evaluated on the generation of multiply charged ions of cytochrome c in a 2-nitrophloroglucinol (2-NPG) matrix in high-vacuum, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). The presence of 1% TFA in the 2-NPG matrix solution was more effective in generating multiply charged protein ions than matrix solutions containing 0.1% or 0% TFA. Regarding the matrix itself, with 1% TFA, 2-NPG was significantly more effective in generating multiply charged ions than 2,5-dihydroxybenzoic acid (2,5-DHB). The maximum charge state of cytochrome c was +8 when using a 2-NPG matrix containing 1% TFA.
김지현(Jihyeon Kim),김진호(Jin-Ho Kim),김효식(Hyo-Sik Kim),류재홍(Jae-Hong Ryu),강석환(Suk-Hwan Kang),이예지(Ye-Jee Lee),이수출(Soo-Chool Lee) 한국에너지기후변화학회 2020 에너지기후변화학회지 Vol.15 No.2
Combustion characteristics of fuel oils such as bio heavy oil, pyrolysis oil, and ion refined oil were investigated to reserve basic data in terms of designing a reactor using fuel oil and selecting operating conditions. For the analysis of combustion characteristics, fuel oil was combusted with a thermogravimetric analyzer (TGA) under non-isothermal heating conditions (5 °C/min, 10 °C/min, 20 °C/min) in the air within the range of 25 °C to 945 °C. The activation energy and reaction order for fuel oil combustion have been kinetically interpreted using various methods such as the Kissinger, Chatterjee-Conrad, Coats-Redfern or Freeman-Carroll method. In this study, the activation energy of the three fuel oils was less than 50 kJ/mol, and Kissingers method with a reaction order of 1 showed an activation energy of less than 7.5. As a result, the activation energy and reaction order for the combustion characteristics of the three fuel oils were obtained for Freeman-Carrolls method among several interpretation methods. Through this, the Freeman-Carroll method was commonly applied according to the type of fuel oil (bio heavy oil, pyrolysis oil, ion refined oil), and the Kissinger method was limited to pyrolysis oil within a certain range. Through this study, it was possible to classify an appropriate analysis method according to the type of fuel oil.
김지현(Jihyeon Kim),김효식(Hyo-Sik Kim),김진호(Jin-Ho Kim),류재홍(Jae-Hong Ryu) 한국에너지기후변화학회 2021 한국에너지기후변화학회 학술대회 Vol.2021 No.11
우리 삶에 있어 생활 편의성이 중요시되면서 포장용기나 일회용품 사용량이 급증함에 따라 폐플라스틱의 발생량이 매년 증가하고 있다. 이에 폐플라스틱을 처리할 수 있는 기술에 대한 관심도가 높아지고 있다. 폐플라스틱 처리 기술 중 하나인 열분해 공정을 통해 연료유로 사용 가능한 열분해유를 생산할 수 있다. 이러한 연료유를 사용할 수 있는 반응 장치 설계나 운전조건 선정을 위해 기초 특성에 대한 자료가 필요한 상황이다. 이에 열분해유를 포함하여 연료유에 속하는 바이오중유, 이온정제유의 연소 특성을 열중량 분석기로 분석하여 비교하였다. 연소 특성 분석은 25 ~ 945 ℃ 온도 범위 내에서 승온 조건 (5 ℃/분, 10 ℃/분, 20 ℃/분)에서 열중량 분석기로 연소 특성을 관찰하였다. 분석 결과는 여러 가지 속도론적 해석(Kissinger, Chatterjee-Conrad, Coats-Redfern, Freeman-Carroll) 방법을 사용하여 비교 해석하였다. 그 결과 연료유 종류에 따라 적합한 해석 방법을 구분 지을 수 있었다.