Role of the UV absorber as a matrix in matrix‐assisted laser desorption/ionization mass spectrometric analysis of a mixture of a UV absorber and a stabilizer

Im, Song-Hee; Choi, Sung‐Seen

doi:10.1002/rcm.4701

Cited by 5 publications

(4 citation statements)

References 20 publications

(27 reference statements)

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“…Then, the reactions between the radicals generated the gel. 27 Correspondingly, the UV stabilizers, whose photostabilizing mechanisms were shown in Scheme 1, [45][46][47] were able to decrease the gel formation. Figure 3 revealed the gel content of samples before and after UV irradiation.…”

Section: Effect Of the Irradiation Time On The Gel Contentmentioning

confidence: 99%

Effect of UV absorbers and hindered amine light stabilizers on the photodegradation of ethylene–octene copolymer

Liu

Chen

Zhang

2012

J of Applied Polymer Sci

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The photodegradation behavior of ethylene-octene copolymer (EOC) and EOC stabilized with UV stabilizers (Tinuvin 326, Chimassorb 81, Tinuvin 770 and Chimassorb 944) were investigated by the digital photography, color difference, gel content, Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and mechanical tests. The results revealed that EOC exhibited a very poor photostability, whose performances were sharply reduced with increasing the irradiation time. The photodegradation products consisted of the carbonyl, hydroxyl and vinyl groups. The additives all showed an excellent photostabilizing effect, which effectively inhibited the gel formation and the chain photooxidation. The photostabilizing efficiency of these UV stabilizers could be ranked as Tinuvin 326 < Chimassorb 81 < Tinuvin 770 and Chimassorb 944. The secondary crystallization behavior was strongly affected by the annealing and chain scission. The chain scission, rather than the annealing, played a greater role in the secondary crystallization of the chain segments. And the serious chain scission could improve the mobility of the chain segments, which sharply promoted their crystallizability.

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Section: Effect Of the Irradiation Time On The Gel Contentmentioning

confidence: 99%

Effect of UV absorbers and hindered amine light stabilizers on the photodegradation of ethylene–octene copolymer

Liu

Chen

Zhang

2012

J of Applied Polymer Sci

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“…16,17 In this study, the UV absorbers were employed as the matrix to analyze polystyrene (PS) using MALDI-MS. The UV absorbers absorb UV radiation well, are not expensive, and are easily available materials.…”

Section: 2mentioning

confidence: 99%

“…[9][10][11][12][13][14][15] In general, the UV absorbers absorb UV wavelength between 295 and 400 nm, so they can potentially play a role as a matrix in MALDI analysis. 16,17 In this study, the UV absorbers were employed as the matrix to analyze polystyrene (PS) using MALDI-MS. The UV absorbers absorb UV radiation well, are not expensive, and are easily available materials.…”

Section: 2mentioning

confidence: 99%

Role of a UV Absorber as a Matrix for Analysis of Polystyrene Using Matrix-Assisted Laser Desorption/Ionization-Mass Spectrometry

Choi¹,

Chung²

2012

Bulletin of the Korean Chemical Society

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Matrix-assisted laser desorption/ionization (MALDI) has been widely used as a soft ionization technique and matrixassisted laser desorption/ionization-mass spectrometry (MALDI-MS) has been used to characterize polymeric materials.1-5 MALDI is achieved in two steps. [6][7][8][9] In the first step, a mixture solution of an analyte and a matrix is spotted on the sample plate, and is dried before analysis. A solid solution deposit of analyte-doped matrix crystals is obtained, and the analyte molecules are completely isolated from each other by embedding throughout the matrix. The second step involves ablation of the solid solution by pulse laser. The pulse laser irradiation induces rapid heating to cause sublimation of the matrix crystals and ionization can occur during this process. Selection of the matrix in MALDI-MS absolutely affect the MALDI process. 1,2o-Hydroxyphenyl benzotriazole and hydroxyphenyl triazine derivatives are commonly used as UV absorbers. They absorb destructive UV radiation and dissipate the energy in the form of heat.9-15 In general, the UV absorbers absorb UV wavelength between 295 and 400 nm, so they can potentially play a role as a matrix in MALDI analysis. 16,17 In this study, the UV absorbers were employed as the matrix to analyze polystyrene (PS) using MALDI-MS. The UV absorbers absorb UV radiation well, are not expensive, and are easily available materials. The analytical results using the UV absorbers were compared with that using anthracene-1,8,9-triol (DIT). DIT is the most common matrix for MALDI-MS analysis of PS. 1,18,19Tinuvin 234, Tinuvin 326, Tinuvin 327, Tinuvin 328, Tinuvin 329, Tinuvin 360, and Tinuvin P are UV absorbers of o-hydroxyphenyl benzotriazole derivatives. Tinuvin 1577 is a UV absorber of a hydroxyphenyl triazine derivative. Figure 1 shows the MALDI-MS spectra of PS obtained from the samples prepared using DIT and Tinuvin 234 as the matrix. Abundances of the [PS + Ag] + ions of the MALDI mass spectrum obtained using Tinuvin 234 were larger than those obtained using DIT by about twice. It is a very interesting result because DIT is known to be a proper matrix for MALDI-MS analysis of PS. The average molecular weights were about 4,000-4,200 as listed in Table 1. The average molecular weights for the Tinuvin 234 case were slightly larger than those for the DIT one by about 4%. The other UV absorbers of Tinuvin 326, Tinuvin 327, Tinuvin 328, Tinuvin 329, Tinuvin 360, Tinuvin P, and Tinuvin 1577 were also employed as the matrix, and the analysis results are

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“…[20][21][22] UV absorbers can be directly analyzed without any matrix only by the N 2 laser radiation. 23,24 Since the UV absorbers absorb UV radiation well, are not expensive, and are easily available materials, they will be potential matrices for MALDI-MS analysis using a UV laser. In the present work, novel matrix systems for the MALDI-MS analysis of polystyrene (PS) using UV absorbers and a UV stabilizer were investigated.…”

Section: Introductionmentioning

confidence: 99%

Novel co-matrix systems for the MALDI-MS analysis of polystyrene using a UV absorber and stabilizer

Choi

Chung

2013

Analyst

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Co-matrix systems composed of a UV absorber and a UV stabilizer applied to the analysis of polystyrene (PS) using a matrix-assisted laser desorption/ionization-mass spectrometer (MALDI-MS) equipped with a N(2) laser (337 nm) as the light source were investigated. Various UV absorbers such as Tinuvin 234, Tinuvin 326, Tinuvin 327, Tinuvin 328, Tinuvin 329, and Tinuvin 1577 and a UV stabilizer of Tinuvin 770 were used. Analytical results using the co-matrix systems were compared with those using anthracene-1,8,9-triol (DIT) as the most common matrix for PS analysis. The MALDI mass spectrum of PS obtained using single DIT showed higher ionization efficiency than that using a mixture of DIT and Tinuvin 770 as the matrix. In contrast to this, for the UV absorbers, the ionization efficiencies were notably enhanced by using the co-matrix systems of the UV absorber and Tinuvin 770. The analytical results were explained with the enhanced compatibility with PS by the formation of a complex between the UV absorber and Tinuvin 770 and with the capability of transferring silver cations. Prices of Tinuvin 770 and the UV absorbers are much cheaper than those of the common matrices. The co-matrix systems are recommendable for the MALDI-MS analysis of PS, especially the co-matrix system composed of Tinuvin 234 and Tinuvin 770.

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Role of the UV absorber as a matrix in matrix‐assisted laser desorption/ionization mass spectrometric analysis of a mixture of a UV absorber and a stabilizer

Cited by 5 publications

References 20 publications

Effect of UV absorbers and hindered amine light stabilizers on the photodegradation of ethylene–octene copolymer

Effect of UV absorbers and hindered amine light stabilizers on the photodegradation of ethylene–octene copolymer

Role of a UV Absorber as a Matrix for Analysis of Polystyrene Using Matrix-Assisted Laser Desorption/Ionization-Mass Spectrometry

Novel co-matrix systems for the MALDI-MS analysis of polystyrene using a UV absorber and stabilizer

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