Publications by authors named "Alan C. Hopkinson"

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Understanding the Binding and Structures in Model Complexes of Polypeptides and Cofactors.
Yinan Li, Kenny K Y Lun, Justin Kai-Chi Lau, Jonathan Martens, Giel Berden, Alan C Hopkinson

ACS Phys Chem Au· September 2025

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Structure and fragmentation chemistry of the peptide radical cations of glycylphenylalanylglycine (GFG).
Yinan Li, Justin Kai-Chi Lau, Teun van Wieringen, Jonathan Martens, Giel Berden, Alan C Hopkinson

PLoS One· August 2024

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Phosphate Migration versus the Loss of Phosphoric Acid in Protonated Phosphopeptides: A Computational Study.
Justin Kai-Chi Lau, Alan C Hopkinson, K W Michael Siu

J Phys Chem B· January 2024

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Cations Derived from Fentanyls Generated by Atmospheric Pressure Photoionization in the Presence of Ammonia: An IMS-MS Study.
Justin Kai-Chi Lau, Vladimir Romanov, Stefan Lukow, Alan C Hopkinson, Udo H Verkerk

J Am Soc Mass Spectrom· July 2021

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Generation, Characterization, and Dissociation of Radical Cations Derived from Prolyl-glycyl-glycine.
Justin Kai-Chi Lau, Francis Esuon, Giel Berden, Jos Oomens, Alan C Hopkinson

J Phys Chem B· June 2021

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Dissociative electron transfer of copper(ii) complexes of glycyl(glycyl/alanyl)tryptophan in vacuo: IRMPD action spectroscopy provides evidence of transition from zwitterionic to non-zwitterionic peptide structures.
Yinan Li, Mengzhu Li, Daniel M Spencer, Justin Kai-Chi Lau, Jonathan Martens, Alan C Hopkinson

Phys Chem Chem Phys· June 2020

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Doubly Charged Small Organic Fragments Derived from [Ce(tripeptide)(CHCN)] Complexes: Observation of the Elusive [b + H] Ions.
Yating Wang, Justin Kai-Chi Lau, Cheuk-Kuen Lai, Alan C Hopkinson, K W Michael Siu

J Phys Chem B· December 2019

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Structures and Dissociation Products of Ce/Peptide Complexes: Competition between Coordination and Charge Delocalization.
Yating Wang, Cheuk-Kuen Lai, Justin Kai-Chi Lau, Alan C Hopkinson, K W Michael Siu

J Phys Chem B· June 2019

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Hydrogen atom transfer in the radical cations of tryptophan-containing peptides AW and WA studied by mass spectrometry, infrared multiple-photon dissociation spectroscopy, and theoretical calculations.
Andrii Piatkivskyi, Justin Kai-Chi Lau, Giel Berden, Jos Oomens, Alan C Hopkinson

Eur J Mass Spectrom (Chichester)· February 2019

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Loss of water from protonated polyglycines: interconversion and dissociation of the product imidazolone ions.
K H Brian Lam, Justin Kai-Chi Lau, Cheuk-Kuen Lai, Ivan K Chu, Jonathan Martens, Alan C Hopkinson

Phys Chem Chem Phys· July 2018

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Interconversion between 4-Imidazolone Ions; Isomers of [b] Derived from Protonated Tetraglycine.
K H Brian Lam, Justin Kai-Chi Lau, Cheuk-Kuen Lai, Alan C Hopkinson, K W Michael Siu

J Phys Chem B· October 2017

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Isomerization versus dissociation of phenylalanylglycyltryptophan radical cations.
Xiaoyan Mu, Justin Kai-Chi Lau, Cheuk-Kuen Lai, K W Michael Siu, Alan C Hopkinson

Phys Chem Chem Phys· June 2017

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Radical-induced dissociation leading to the loss of CO2 from the oxazolone ring of [b5- H]˙(+) ions.
Justin Kai-Chi Lau, Junfang Zhao, Declan Williams, Bai-Han Backen Wu, Yating Wang, Alan C Hopkinson

Phys Chem Chem Phys· July 2016

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Cysteine Radical/Metal Ion Adducts: A Gas-Phase Structural Elucidation and Reactivity Study.
Michael Lesslie, Justin Kai-Chi Lau, John T Lawler, K W Michael Siu, Vincent Steinmetz, Alan C Hopkinson

Chempluschem· May 2016

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Nucleophilic substitution by amide nitrogen in the aromatic rings of [zn - H]˙⁺ ions; the structures of the [b₂ - H - 17]˙⁺ and [c1 - 17]⁺ ions.
Xiaoyan Mu, Justin Kai-Chi Lau, Cheuk-Kuen Lai, K W Michael Siu, Alan C Hopkinson

Phys Chem Chem Phys· April 2016

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Alkali-Metal-Ion-Assisted Hydrogen Atom Transfer in the Homocysteine Radical.
Michael Lesslie, Justin Kai-Chi Lau, John T Lawler, K W Michael Siu, Jos Oomens, Alan C Hopkinson

Chemistry· February 2016

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Transnitrosylation products of the dipeptide cysteinyl-cysteine: an examination by tandem mass spectrometry and density functional theory.
Matias Butler, K W Michael Siu, Alan C Hopkinson

Phys Chem Chem Phys· February 2016

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Investigation of Fragmentation of Tryptophan Nitrogen Radical Cation.
Andrii Piatkivskyi, Marshall Happ, Justin Kai-Chi Lau, K W Michael Siu, Alan C Hopkinson

J Am Soc Mass Spectrom· August 2015

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Radical-induced, proton-transfer-driven fragmentations in [b(5)-H]˙(+) ions derived from pentaalanyl tryptophan.
Declan Williams, Justin Kai-Chi Lau, Junfang Zhao, Stefanie Mädler, Yating Wang, Alan C Hopkinson

Phys Chem Chem Phys· April 2015

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Formation, isomerization, and dissociation of ε- and α-carbon-centered tyrosylglycylglycine radical cations.
Cheuk-Kuen Lai, Xiaoyan Mu, Qiang Hao, Alan C Hopkinson, Ivan K Chu

Phys Chem Chem Phys· November 2014

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Fragmentation of peptide radical cations containing a tyrosine or tryptophan residue: structural features that favor formation of [x(n-1) + H]˙⁺ and [z(n-1) + H]˙⁺ ions.
Stefanie Mädler, Justin Kai-Chi Lau, Declan Williams, Yating Wang, Irine S Saminathan, Alan C Hopkinson

J Phys Chem B· June 2014

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Structures of a(n)* ions derived from protonated pentaglycine and pentaalanine: results from IRMPD spectroscopy and DFT calculations.
Junfang Zhao, Justin Kai-Chi Lau, Josipa Grzetic, Udo H Verkerk, Jos Oomens, Alan C Hopkinson

J Am Soc Mass Spectrom· December 2013

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Metal ion complexes with HisGly: comparison with PhePhe and PheGly.
Robert C Dunbar, Jos Oomens, Giel Berden, Justin Kai-Chi Lau, Udo H Verkerk, Alan C Hopkinson

J Phys Chem A· June 2013

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Fragmentation chemistry of [Met-Gly]•+, [Gly-Met]•+, and [Met-Met]•+ radical cations.
Justin Kai-Chi Lau, Seydina Lo, Junfang Zhao, K W Michael Siu, Alan C Hopkinson

J Am Soc Mass Spectrom· April 2013

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Structure and reactivity of the distonic and aromatic radical cations of tryptophan.
Andrii Piatkivskyi, Sandra Osburn, Kendall Jaderberg, Josipa Grzetic, Jeffrey D Steill, Alan C Hopkinson

J Am Soc Mass Spectrom· April 2013

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