The Mass Spectrometry society of Japan - The 68th Annual Conference on Mass Spectrometry, Japan
Japanese

Abstract

Table of contents

Timetable

Plenary Lectures

Award Lecture

Oral Sessions (Day1, Day2, Day3)

Poster Presentations (Day1, Day2, Day3)

Panel Discussion

Luncheon Seminars (Day1, Day2, Day3)

Corporate Program

Oral Sessions

Day 3, June 24（Fri.）　9:20-9:40　Room D (413 and 414)

3D-O1-0920　　PDF

Verification of phase explosion in the MALDI process using ultraviolet post-laser ionization method

(Niigata Univ. Pharm. Appl. Sci.)
oTatsuro Shirota, Kennosuke Hoshina

Neutral 2,5-dihydroxy benzoic acid (DHB) in the MALDI plume was probed by UV laser post-ionization. DHB+ (m 154), dehydrated ions [DHB-H2O]+ (m 136) were detected as the neutral DHB-derived ions and decarbonated ions [DHB-CO2]+ (m 110) was detected as the neutral dehydrated DHB-derived ions by a time-of-flight mass spectrometer. With increasing delay time between lasers, the ratio m136/m154 decreases and converges to a constant value, while the ratio m110/m154 increases and converges to a constant value. This result indicates that the highly excited neutral DHB molecules remain without sufficient energy relaxation through collisions in the front part of the plume, while the energy relaxation sufficiently proceeds, and the overall temperature rises higher than the pyrolysis temperature in the rear part of the plume, resulting in the phase explosion.