^*Indicates author to whom correspondence should be addressed

A new maximum likelihood approach with asymmetric residual distribution for multicomponent mass spectra analysis

Jukka Heikkonen,^a,* Jouni Juujarvi,^a,f Marianna Ridderstad,^bTapio Kotiaho,^c Raimo A. Ketola^d and Virpi Tarkiainen^e
aHelsinki University of Technology, Laboratory of Computational Engineering, PO Box 9203, FIN-02015 Hut, Finland. E-mail: jukka.heikkonen@hut.fi, jouni.juujarvi@codator.fi
^bHelsinki University, Observatory, University of Helsinki, Tahtitorninmaki, PO Box 14, FIN-00014, Finland. E-mail: marianna@astro.helsinki.fi
^cUniversity of Helsinki, Laboratory of Analytical Chemistry, Department of Chemistry, University of Helsinki, A.I. Virtasen aukio 1, PO Box 55, FIN-00014, Finland. E-mail:tapio.kotiaho@helsinki.fi
^dUniversity of Helsinki, Drug Discovery Technology Center DDTC, Department of Pharmacy, University of Helsinki, PO Box 56, Viikinkaari 5E, FIN-00014 Finland. E-mail: raimo.ketola@helsinki.fi
^eTechnical Research Centre of Finland, VTT ProcessesBiologinkuja 7, P.O.Box 1602, FIN-02044 VTT, Finland. E-mail: virpi.tarkiainen@vtt.fi

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DOI: 10.1255/ejms.672

Comparison of three types of mass spectrometers for HPLC/MS analysis of perfluoroalkylated substances and fluorotelomer alcohols

Urs Berger^a,* Ingrid Langlois,^b Michael Oehme^b and Roland Kallenborn^a
aNorwegian Institute for Air Research (NILU), Instituttveien 18, NO-2027 Kjeller and The Polar Environmental Centre, NO-9296 Tromsø, Norway. E-mail: urs.berger@nilu.no
^bOrganic Analytical Chemistry, University of Basel, Neuhausstr. 31, CH-4057 Basel, Switzerland

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DOI: 10.1255/ejms.679

Determination of rare earth impurities in high purity europium oxide by inductively coupled plasma-mass spectrometry and evaluation of concentration values for europium oxide standard material

Anding Zhang^a*, Xiangsheng Liu^b and Wen Zhang^b
aUniversity of New Mexico, Department of Chemistry, Albuquerque, NM 87131, USA. E-mail: zhangad@unm.edu
^bBeijing General Research Institute for Non-Ferrous Metals, Beijing 100088, PR China

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DOI: 10.1255/ejms.667

Electrospray ionization mass spectrometry studies of rhenium(I) bipyridyl complexes

Rong Zhang,^a Shiguo Sun,^a Xiaojun Peng,^a,* Licheng Sun^a,b,*
,^aState Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China. E-mail: pengxj@dlut.edu.cn
^bDepartment of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 106 91 Stockholm, Sweden

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DOI: 10.1255/ejms.676

Electrospray mass spectrometry of a series of mixed nitrido ^99gTc-heterocomplexes conjugated with bioactive molecules

Michela Tubaro,^a Ester Marotta,^a Francesco Tisato,^b Cristina Bolzati,^b Marina Porchia,^b Fiorenzo Refosco,^b Patrizia Tomasin,^b Mario Cavazza-Ceccato^c and Pietro Traldi^a,*
aCNR, Istituto di Scienze e Tecnologie Molecolari, Corso Stati Uniti 4, I-35127 Padova, Italy
^bCNR, Istituto di Chimica Inorganica e delle Superfici, Corso Stati Uniti 4, I-35127 Padova, Italy
^cUniversity of Padova, Dipartimento di Scienze Farmaceutiche, Via Marzolo 5, I-35131 Padova, Italy

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DOI: 10.1255/ejms.677

Identification of some polymeric materials by low-temperature pyrolysis mass spectrometry

Sayed M. Badawy
Laboratory of Mass Spectrometry, Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt. E-mail: sayedbadawy@hotmail.com

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DOI: 10.1255/ejms.668

Determination of phenylalanine isotope ratio enrichment by liquid chromatography/time-of-flight mass spectrometry

Zhanpin Wu,^a* Xiao-Jun Zhang,^b Robert B. Cody^a and Robert R. Wolfe^b
aAnalytical Instrument Division, JEOL USA, Inc., 11 Dearborn Road, Peabody, MA 01960, USA. E-mail: zwu@jeol.com
^bMetabolism Division, Department of Surgery, University of Texas Medical Branch at Galveston, Galveston, TX 77550, USA

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DOI: 10.1255/ejms.670

Models of fragmentations induced by electron attachment to protonated peptides

Vebjørn Bakken, Trygve Helgaker and Einar Uggerud^*
Department of Chemistry, University of Oslo, P.O. Box 1033 Blindern, N-0315 Oslo, Norway. E-mail: einar.uggerud@kjemi.uio.no

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DOI: 10.1255/ejms.665

Fragmentation study of peptides using Fourier transform ion cyclotron resonance with infrared multiphoton dissociation : experiment and simulation

Kazuhiko Fukui,^a,* Yasuhide Naito,^b Yutaka Akiyama,^a and Katsutoshi Takahashi^a
aComputational Biology Research Center (CBRC), National Institute of Advanced Industrial Science and Technology (AIST), 2-41-6 Aomi, Koto-ku, Tokyo 135-0064, Japan. E-mail: k-fukui@aist.go.jp
^bDepartment of Glycobiology, Tokyo Metropolitan Institute of Gerontology (TMIG), 35-2 Sakae-cho, Itabashi-ku, Tokyo, 173-0015, Japan

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DOI: 10.1255/ejms.656

Chiral discrimination on the host-guest-complexation of resorc[4]arenes with quarternary amines

Ahmad Mehdizadeh, Matthias C. Letzel, Michael Klaes, Ceno Agena and Jochen Mattay^*
Organische Chemie I, Fakultät für Chemie, Universität Bielefeld, Postfach 100131, 33501 Bielefeld, Germany. E-mail: mattay@uni-bielefeld.de

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DOI: 10.1255/ejms.675

Changes of phospholipid composition within the dystrophic muscle by matrix-assisted laser desorption/ionization mass spectrometry and mass spectrometry imaging

David Touboul,^a Hélène Piednoël,^a Vincent Voisin,^b Sabine De La Porte,^b Alain Brunelle,^a Frédéric Halgand^a*and Olivier Laprévote^a
aLaboratoire de Spectrométrie de Masse, Institut de Chimie des Substances Naturelles, CNRS, 1 Avenue de la Terrasse, F91198 Gif sur Yvette Cedex, France. E-mail: halgand@icsn.cnrs-gif.fr
^bLaboratoire de Neurobiologie Cellulaire et Moléculaire, Institut de Neurobiologie Alfred Fessard, CNRS, 1 Avenue de la Terrasse, F91198 Gif sur Yvette Cedex, France

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DOI: 10.1255/ejms.671

Electrospray mass spectrometry and tandem mass spectrometry of the natural mixture of cyclic peptides from linseed

Piotr Stefanowicz
Faculty of Chemistry, University of Wrocław, Joliot Curie 14, PL 50383 Wrocław, Poland. E-mail: Stp@wchuwr.chem.uni.wroc.pl

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DOI: 10.1255/ejms.657

N-methyl-N-trimethylsilyltrifluoroacetamide-promoted synthesis and mass spectrometric characterization of deuterated ephedrines

Mario Thevis,^* Georg Opfermann and Wilhelm Schänzer
Institute of Biochemistry, German Sport University Cologne, Carl-Diem Weg 6, 50933 Cologne, Germany. E-mail: m.thevis@biochem.dshs-koeln.de

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DOI: 10.1255/ejms.669

Electrospray tandem mass spectrometry for structural characterization of aporphine-benzylisoquinoline alkaloids

Wu-Nan Wu^* and Michael D. Moyer
Division of Preclinical Drug Evaluation, Johnson & Johnson Pharmaceutical Research & Development, LLC, Spring House, PA 19477, USA. E-mail: jawee@erols.com

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DOI: 10.1255/ejms.660

High resolution electrospray and electrospray tandem mass spectra of rotenone and its isoxazoline cycloadducts

Massimiliano Cordaro,^a Leonardo Di Donna,^b Giovanni Grassi,^a Loredana Maiuolo,^b Fabio Mazzotti,^b,c, Enzo Perri,^c Giovanni Sindona^b and Antonio Tagarelli^b
aDipartimento di Chimica Organica e Biologica, Università, Vill. S. Agata, I-98166 Messina, Italy
^bDipartimento di Chimica, Università della Calabria, cubo 12/C I- 87030 Arcavacata di Rende (CS), Italy
^cIstituto Sperimentale per l’Olivicoltura, Contrada Li Rocchi, I-87036 Rende (CS), Italy

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DOI: 10.1255/ejms.664

Characterization of novel nucleoside analogs by electrospray ionization mass spectra

Liu Yan,^a Chen Xiao- Lan,^b He Juan,^c Hou Jian-Bo,^bQu Ling-Bo^a and Zhao Yu-Fen^a,b,d*
aThe Key Laboratory for Chemical Biology of Fujian Province, Department of Chemistry, Xiamen University, Xiamen, 361005, PR China
^bDepartment of Chemistry, Zhengzhou University, Zhengzhou, 450052, PR China
^cDepartment of Chemistry, Zhengzhou Engineering Institute, Zhengzhou, 450052, PR China
^dThe Key Laboratory of Bioorganic Phosphorous Chemistry of Education Ministry, Department of Chemistry, School of Life Science and Engineering, Tsinghua University, Beijing 100084, PR China

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DOI: 10.1255/ejms.678

Characterization of G-rich and T-rich oligonucleotides using ion-pair reversed-phase high-performance liquid chromatography/tandem electrospray ionization mass spectrometry

Renfang Song,^a,b Wenbing Zhang,^a Huayong Chen,^a,b Huimin Ma,^a,b Yulian Dong,^a Guoying Sheng,^a Zhen Zhou^a and Jiamo Fu^a,*
aState Key Laboratory of Organic Geochemistry, Guangzhou Research Center of Mass Spectrometry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China. E-mail: fujm.gig.ac.cn
^bGraduate School of the Chinese Academy of Sciences, Beijing , China

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DOI: 10.1255/ejms.666

Characterization of the O-4 phosphorylated and O-5 substituted Kdo reducing end group and sequencing of the core oligosaccharide of Aeromonas salmonicida ssp salmonicida lipopolysaccharide using tandem mass spectrometry

Joseph Banoub,^a,b* Anas El Aneed,^b Alejandro Cohen,^c and Patrick Martin^b
aDepartment of Fisheries and Oceans, Science Branch, Special Projects, PO Box 5667, St. John’s, NL A1C 5X1, Canada. E-mail: banoubjo@dfo-mpo.gc.ca
^bMemorial University of Newfoundland, Biochemistry Department, St. John’s, NL A1C 5S7, Canada
^cIUT Bethune, Departement de Chimie, Université d’Artois, Bethune, France

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DOI: 10.1255/ejms.673

Mass spectrometric identification of cyclic polysulfides in sediment of the Eastern Gulf of Finland. I

Larisa O. Khoroshko^a, Viatcheslav V. Takhistov^a, Varvara N. Petrova,^aIgor V. Viktorovskii,^a Mirja Lahtiperä^b and Jaakko Paasivirta^b,*
aSaint-Petersburg Center of Ecological Safety, Russian Academy of Sciences, 197042 St.-Petersburg, Korpusnaya Str. 18, Russia
^bDepartment of Chemistry, University, PO Box 35, FIN-40351 Jyväskylä, Finland

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DOI: 10.1255/ejms.661

Mass spectrometric identification of cyclic polysulfides in sediment of the Eastern Gulf of Finland. II

Viatcheslav V. Takhistov,^a Larisa O. Khoroshko,^a Igor V. Viktorovskii,^a Mirja Lahtiperä^b and Jaakko Paasivirta^b,*
aSaint-Petersburg Center of Ecological Safety, Russian Academy of Sciences, 197042 St.-Petersburg, Korpusnaya Str. 18, Russia
^bDepartment of Chemistry, University, PO Box 35, FIN-40014 Jyväskylä, Finland

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DOI: 10.1255/ejms.662