Pub Date : 2021-01-01DOI: 10.5478/MSL.2021.12.3.118
Lee Seulgidaun, Kim Sunghwan
{"title":"Study on Photodegradable Water-Soluble Compounds of Expanded Polystyrene","authors":"Lee Seulgidaun, Kim Sunghwan","doi":"10.5478/MSL.2021.12.3.118","DOIUrl":"https://doi.org/10.5478/MSL.2021.12.3.118","url":null,"abstract":"","PeriodicalId":18238,"journal":{"name":"Mass Spectrometry Letters","volume":"245 1","pages":"118-124"},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77772497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.5478/MSL.2021.12.3.59
J. Kim, Jeongkwon Kim
{"title":"Special Issue in Honor of Dr. Jong Shin Yoo’s Retirement","authors":"J. Kim, Jeongkwon Kim","doi":"10.5478/MSL.2021.12.3.59","DOIUrl":"https://doi.org/10.5478/MSL.2021.12.3.59","url":null,"abstract":"","PeriodicalId":18238,"journal":{"name":"Mass Spectrometry Letters","volume":"18 1","pages":"59-59"},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87271582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.5478/10.5478/MSL.2021.12.3.66
Ju Yeon Lee, Jinwoong Choi, Sang-Bum Bae, Heeyoun Hwang, J. Yoo, J. Lee, Eun Ji Kim, Y. Jeon, J. Kim
{"title":"Characterization of the N-glycosylation of Recombinant IL-4 and IL-13 Proteins Using LC-MS/MS Analysis and the I-GPA Platform","authors":"Ju Yeon Lee, Jinwoong Choi, Sang-Bum Bae, Heeyoun Hwang, J. Yoo, J. Lee, Eun Ji Kim, Y. Jeon, J. Kim","doi":"10.5478/10.5478/MSL.2021.12.3.66","DOIUrl":"https://doi.org/10.5478/10.5478/MSL.2021.12.3.66","url":null,"abstract":"","PeriodicalId":18238,"journal":{"name":"Mass Spectrometry Letters","volume":"153 1","pages":"66-75"},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78203355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.5478/MSL.2021.12.1.26
M. Hossion, B. Arora
The impurity concentration is a crucial parameter for semiconductor thin films. Evaluating the impurity distribution in silicon thin film is another challenge. In this study, we have investigated the doping concentration of boron in silicon thin film using time of flight secondary ion mass spectrometry in dynamic mode of operation. Boron doped silicon film was grown on i) p-type silicon wafer and ii) borosilicate glass using hot wire chemical vapor deposition technique for possible applications in optoelectronic devices. Using well-tuned SIMS measurement recipe, we have detected the boron counts 101~104 along with the silicon matrix element. The secondary ion beam sputtering area, sputtering duration and mass analyser analysing duration were used as key variables for the tuning of the recipe. The quantitative analysis of counts to concentration conversion was done following standard relative sensitivity factor. The concentration of boron in silicon was determined 1017~1021 atoms/cm3. The technique will be useful for evaluating distributions of various dopants (arsenic, phosphorous, bismuth etc.) in silicon thin film efficiently.
{"title":"Boron Detection Technique in Silicon Thin Film Using Dynamic Time of Flight Secondary Ion Mass Spectrometry","authors":"M. Hossion, B. Arora","doi":"10.5478/MSL.2021.12.1.26","DOIUrl":"https://doi.org/10.5478/MSL.2021.12.1.26","url":null,"abstract":"The impurity concentration is a crucial parameter for semiconductor thin films. Evaluating the impurity distribution in silicon thin film is another challenge. In this study, we have investigated the doping concentration of boron in silicon thin film using time of flight secondary ion mass spectrometry in dynamic mode of operation. Boron doped silicon film was grown on i) p-type silicon wafer and ii) borosilicate glass using hot wire chemical vapor deposition technique for possible applications in optoelectronic devices. Using well-tuned SIMS measurement recipe, we have detected the boron counts 101~104 along with the silicon matrix element. The secondary ion beam sputtering area, sputtering duration and mass analyser analysing duration were used as key variables for the tuning of the recipe. The quantitative analysis of counts to concentration conversion was done following standard relative sensitivity factor. The concentration of boron in silicon was determined 1017~1021 atoms/cm3. The technique will be useful for evaluating distributions of various dopants (arsenic, phosphorous, bismuth etc.) in silicon thin film efficiently.","PeriodicalId":18238,"journal":{"name":"Mass Spectrometry Letters","volume":"39 1","pages":"26-30"},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77804124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.5478/MSL.2020.11.2.30
Hyung-Ju Seo, Seung-Bae Ji, Sin-Eun Kim, Gyung-Min Lee, Seong-Hun Moon, D. Jang, Kwang-Hyeon Liu
{"title":"Analysis of Dibenzocyclooctadiene Lignans in Omija Wine and Cheong by Liquid Chromatography-Tandem Mass Spectrometry","authors":"Hyung-Ju Seo, Seung-Bae Ji, Sin-Eun Kim, Gyung-Min Lee, Seong-Hun Moon, D. Jang, Kwang-Hyeon Liu","doi":"10.5478/MSL.2020.11.2.30","DOIUrl":"https://doi.org/10.5478/MSL.2020.11.2.30","url":null,"abstract":"","PeriodicalId":18238,"journal":{"name":"Mass Spectrometry Letters","volume":"24 1","pages":"30-35"},"PeriodicalIF":0.5,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78989656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.5478/MSL.2020.11.4.108
Tegegn Gizachew Betru, Y. Yim, K. Lee
A certified reference material (CRM) for the analysis of nutrient elements in an edible mushroom (Ganoderma lyceum) powder has been developed (KRISS CRM 108-10-011). The mass fractions of calcium (Ca), iron (Fe), and zinc (Zn) were measured by isotope dilution inductively coupled plasma mass spectrometry (ID ICP/MS). To dissolve the fungi cell wall of mushroom consisted of chitin fibers, sample preparation method by single reaction chamber type microwave-assisted acid digestion with acid mixtures was optimized. The mean measurement results obtained from 12 sample bottles were used to assign as the certified values for the CRM and the between-bottle homogeneities were evaluated from the relative standard deviations. The certified values were metrologically traceable to the definition of the kilogram in the International System of Units (SI). This CRM is expected to be used for validation of analytical methods or quality control of measurement results in analytical laboratories when they determine the mass fractions of elements in mushroom or other similar samples.
{"title":"Development of a Mushroom Powder Certified Reference Material for Element Analysis","authors":"Tegegn Gizachew Betru, Y. Yim, K. Lee","doi":"10.5478/MSL.2020.11.4.108","DOIUrl":"https://doi.org/10.5478/MSL.2020.11.4.108","url":null,"abstract":"A certified reference material (CRM) for the analysis of nutrient elements in an edible mushroom (Ganoderma lyceum) powder has been developed (KRISS CRM 108-10-011). The mass fractions of calcium (Ca), iron (Fe), and zinc (Zn) were measured by isotope dilution inductively coupled plasma mass spectrometry (ID ICP/MS). To dissolve the fungi cell wall of mushroom consisted of chitin fibers, sample preparation method by single reaction chamber type microwave-assisted acid digestion with acid mixtures was optimized. The mean measurement results obtained from 12 sample bottles were used to assign as the certified values for the CRM and the between-bottle homogeneities were evaluated from the relative standard deviations. The certified values were metrologically traceable to the definition of the kilogram in the International System of Units (SI). This CRM is expected to be used for validation of analytical methods or quality control of measurement results in analytical laboratories when they determine the mass fractions of elements in mushroom or other similar samples.","PeriodicalId":18238,"journal":{"name":"Mass Spectrometry Letters","volume":"5 1","pages":"108-112"},"PeriodicalIF":0.5,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81627744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.5478/MSL.2020.11.4.90
H. Yoo, Yoon-Ji Choi, Kun Cho
Interest in aspects of industrialization relating to human health has increased. Accordingly, the use of labels such as ‘natural foods’ and ‘organic ingredients’ has become more widespread, and greater emphasis is being placed on improving quality of life. Water is an essential element for human life, and water quality has a significant impact on human health. However, technology that can precisely determine the substances present in water is still lacking. This study was conducted to establish a complete mass spectrometry process, from pretreatment to analysis, to measure and characterize natural organic matter (NOM) in Korean spring water samples. Salts and other matrices were removed from the samples using solid-phase extraction (SPE) with two different columns (PPL and C18). After establishing an accurate analysis method, the experimental results were evaluated based on Van Krevelen diagrams and analysis of molar O/C and H/C ratios. The method for characterizing NOM introduced herein should facilitate evaluation of water quality.
{"title":"Characterization of Natural Organic Matter in Spring Water","authors":"H. Yoo, Yoon-Ji Choi, Kun Cho","doi":"10.5478/MSL.2020.11.4.90","DOIUrl":"https://doi.org/10.5478/MSL.2020.11.4.90","url":null,"abstract":"Interest in aspects of industrialization relating to human health has increased. Accordingly, the use of labels such as ‘natural foods’ and ‘organic ingredients’ has become more widespread, and greater emphasis is being placed on improving quality of life. Water is an essential element for human life, and water quality has a significant impact on human health. However, technology that can precisely determine the substances present in water is still lacking. This study was conducted to establish a complete mass spectrometry process, from pretreatment to analysis, to measure and characterize natural organic matter (NOM) in Korean spring water samples. Salts and other matrices were removed from the samples using solid-phase extraction (SPE) with two different columns (PPL and C18). After establishing an accurate analysis method, the experimental results were evaluated based on Van Krevelen diagrams and analysis of molar O/C and H/C ratios. The method for characterizing NOM introduced herein should facilitate evaluation of water quality.","PeriodicalId":18238,"journal":{"name":"Mass Spectrometry Letters","volume":"18 1","pages":"90-94"},"PeriodicalIF":0.5,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82450782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.5478/MSL.2020.11.3.52
Yan Gao, Doeun Kim, Eunji Sung, Minjia Tan, T. Kwon, J. N. Lee, Sangkyu Lee
{"title":"Global Histidine Phosphoproteomics in Human Prostate Cancer Cells","authors":"Yan Gao, Doeun Kim, Eunji Sung, Minjia Tan, T. Kwon, J. N. Lee, Sangkyu Lee","doi":"10.5478/MSL.2020.11.3.52","DOIUrl":"https://doi.org/10.5478/MSL.2020.11.3.52","url":null,"abstract":"","PeriodicalId":18238,"journal":{"name":"Mass Spectrometry Letters","volume":"2 1","pages":"52-58"},"PeriodicalIF":0.5,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83001418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Matrix-assisted laser desorption/ionization-mass spectrometry (MALDI-MS) analysis of ionic liquid matrices (ILMs) prepared using pyridine and dihydroxybenzoic acid (DHB), such as 2,3-DHB and 2,5-DHB, displayed an unconventional peak at m/z 232.0, which was regarded as [DHB+pyridine-H]+. The peak at m/z 232.0 was not observed from other ILMs prepared using other DHB isomers, such as 2,4-DHB, 2,6-DHB, 3,4-DHB, and 3,5-DHB. Two requirements to observe the peak at m/z 232.0 in a DHB/pyridine ILM are suggested. First, carboxyl and hydroxyl groups must be located ortho to each other. Second, the secondary hydroxyl group must be located at a carbon with a high electron density. Based on these two requirements, a potential mechanism for the generation of the peak at m/z 232.0 is suggested.
{"title":"Characterization of an Unconventional MALDI-MS Peak from DHB/pyridine Ionic Liquid Matrices","authors":"Jangmi Hong, Jeongkwon Kim","doi":"10.5478/MSL.2020.11.1.6","DOIUrl":"https://doi.org/10.5478/MSL.2020.11.1.6","url":null,"abstract":"Matrix-assisted laser desorption/ionization-mass spectrometry (MALDI-MS) analysis of ionic liquid matrices (ILMs) prepared using pyridine and dihydroxybenzoic acid (DHB), such as 2,3-DHB and 2,5-DHB, displayed an unconventional peak at m/z 232.0, which was regarded as [DHB+pyridine-H]+. The peak at m/z 232.0 was not observed from other ILMs prepared using other DHB isomers, such as 2,4-DHB, 2,6-DHB, 3,4-DHB, and 3,5-DHB. Two requirements to observe the peak at m/z 232.0 in a DHB/pyridine ILM are suggested. First, carboxyl and hydroxyl groups must be located ortho to each other. Second, the secondary hydroxyl group must be located at a carbon with a high electron density. Based on these two requirements, a potential mechanism for the generation of the peak at m/z 232.0 is suggested.","PeriodicalId":18238,"journal":{"name":"Mass Spectrometry Letters","volume":"57 1","pages":"6-9"},"PeriodicalIF":0.5,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81130881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.5478/MSL.2020.11.4.113
Zhexue Wu, Su-Nyeong Jang, So-Young Park, Nguyen Minh Phuc, Kwang-Hyeon Liu
Cytochrome P450 2J2 (CYP2J2) is a member of the cytochrome P450 superfamily, and is known to be arachidonic acid epoxygenase that mediates the formation of four bioactive regioisomers of epoxyeicosatrienoic acids (EETs). CYP2J2 is also involved in the metabolism of drugs such as albendazole, astemizole, danazol, ebastine, and terfenadine. CYP2J2 is highly expressed in the heart and cancer tissues. In this study, the inhibitory potential of ten natural products against CYP2J2 activity was evaluated using human liver microsomes and tandem mass spectrometry. Among them, bilobetin, which is a kind of biflavonoid, exhibits a strong inhibitory effect against the CYP2J2-mediated astemizole O-demethylation (IC50 = 0.73 μM) and terfenadine hydroxylation (IC50 = 0.89 μM). This result suggests that bilobetin can be used as strong CYP2J2 inhibitor in drug metabolism study.
{"title":"Inhibitory Potential of Bilobetin Against CYP2J2 Activities in Human Liver Microsomes","authors":"Zhexue Wu, Su-Nyeong Jang, So-Young Park, Nguyen Minh Phuc, Kwang-Hyeon Liu","doi":"10.5478/MSL.2020.11.4.113","DOIUrl":"https://doi.org/10.5478/MSL.2020.11.4.113","url":null,"abstract":"Cytochrome P450 2J2 (CYP2J2) is a member of the cytochrome P450 superfamily, and is known to be arachidonic acid epoxygenase that mediates the formation of four bioactive regioisomers of epoxyeicosatrienoic acids (EETs). CYP2J2 is also involved in the metabolism of drugs such as albendazole, astemizole, danazol, ebastine, and terfenadine. CYP2J2 is highly expressed in the heart and cancer tissues. In this study, the inhibitory potential of ten natural products against CYP2J2 activity was evaluated using human liver microsomes and tandem mass spectrometry. Among them, bilobetin, which is a kind of biflavonoid, exhibits a strong inhibitory effect against the CYP2J2-mediated astemizole O-demethylation (IC50 = 0.73 μM) and terfenadine hydroxylation (IC50 = 0.89 μM). This result suggests that bilobetin can be used as strong CYP2J2 inhibitor in drug metabolism study.","PeriodicalId":18238,"journal":{"name":"Mass Spectrometry Letters","volume":"68 1","pages":"113-117"},"PeriodicalIF":0.5,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87644579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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