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한국질량분석학회> Mass Spectrometry Letters

Mass Spectrometry Letters update

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수록정보
수록범위 : 1권1호(2010)~10권4호(2019) |수록논문 수 : 199
Mass Spectrometry Letters
10권4호(2019년 12월) 수록논문
최근 권호 논문
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KCI등재 SCOPUS

1Effect of Ultrasonic Microdroplet Generation in the Low-Temperature Plasma Ionization-Mass Spectrometry

저자 : Hyoung Jun Lee , Yong-hyeon Yim

발행기관 : 한국질량분석학회 간행물 : Mass Spectrometry Letters 10권 4호 발행 연도 : 2019 페이지 : pp. 103-107 (5 pages)

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Low-temperature plasma (LTP) ionization is one of the ambient ionization methods typically used in mass spectrometry (MS) for fast screening of chemicals with minimal or no sample preparation. In spite of various advantages of LTP ionization method, including simple instrumentation and in-situ analysis, more general applications of the method are limited due to poor desorption of analytes with low volatilities and low ionization efficiencies in the negative ion mode. In order to overcome these limitations, an ultrasonic vibrator of a commercial hand-held humidifier was interfaced with an LTP ionization source, which generated microdroplets from sample solutions and assisted with LTP ionization. Ionization behaviors of various chemicals in microdroplet-assisted LTP (MA LTP) were tested and compared with typical LTP ionization from dried samples applied on a surface. MA LTP efficiently ionized small organic, amino, and fatty acids with low volatilities and high polarities, which were hardly ionized using the standard LTP method. Facile interaction of LTP with ultrafine droplets generated by ultrasonic resonator allows efficient ionization of relatively non-volatile and polar analytes both in the positive and negative ion modes.

KCI등재 SCOPUS

2Hydrolysis of Penicillin G and Carbenicillin in Pure Water - As Studied by HPLC/ESI-MS

저자 : Marta Kołek , Rafał Frański , Magdalena Frańska

발행기관 : 한국질량분석학회 간행물 : Mass Spectrometry Letters 10권 4호 발행 연도 : 2019 페이지 : pp. 108-111 (4 pages)

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The hydrolysis of penicillin G, carbenicillin and ampicillin in pure water at room temperature was studied by high pressure liquid chromatography electrospray ionization mass spectrometry. Hydrolysis of ampicillin did not occur under these conditions; however, penicillin G and carbenicillin were completely hydrolyzed after seven days. A short interpretation of this difference is proposed. The mass spectrometric behaviour, namely ESI response and fragmentation pathway, of hydrolyzed penicillin G and hydrolyzed carbenicillin have been also discussed.

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In this study, a chloroform consumer chemical product (CCP) reference material (RM) is successfully developed, with potential to be used in the proficiency testing of hazardous compounds in CCPs for analysis and testing agencies. Validation experiments are rigorously conducted to evaluate whether the RM meets the requirements set by the ISO 13528 and ISO Guide 35, using a reliable GC/MS method for the analysis of chloroform. The obtained calibration plot linearity, limit of detection (LOD), and limit of quantitation (LOQ) are excellent. The developed RM meets the homogeneity and stability requirements; the between-unit (sbb) and within-unit (swb) standard deviations are less than 2.5%, and the stability is found to be guaranteed for 50 days.

KCI등재 SCOPUS

4Electron Capture Dissociation Mass Spectrometry for Gaseous Protonated Melittin Ions and Its Single Amino Acid Substituted Variants

저자 : Seonghyun Yu , Hwa-yong Jang , Han Bin Oh

발행기관 : 한국질량분석학회 간행물 : Mass Spectrometry Letters 10권 4호 발행 연도 : 2019 페이지 : pp. 117-122 (6 pages)

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This study demonstrated the sensitivity of electron capture dissociation mass spectrometry (ECD-MS) to probe subtle conformational changes in gaseous melittin ions induced by the substitution of an amino acid. ECD-MS was performed for triply and quadruply-protonated melittin and its variants obtained by a single amino acid substitution, namely, D-Pro14, Pro14Ala, and Leu13Ala. Although native triply-protonted melittin showed only a few peptide backbone cleavage products, the D-Pro14 and Pro14Ala variants exhibited extensive backbone fragments, suggesting the occurrence of a significant structural or conformational change induced by a single amino acid substitution at Pro14. On the contrary, the substitution at Leu13, namely Leu13Ala (+3), did not cause significant changes in the ECD backbone fragmentation pattern. Thus, the sensitivity of ECD-MS is demonstrated to be good enough to probe the aforementioned conformational change in melittin.

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(2006)홍길동 외 1명심리학41회 피인용

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