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Abou-Zeid L, Pell A, Garcia Cortes M, Isnard H, Delangle P, Bresson C. Determination of the affinity of biomimetic peptides for uranium through the simultaneous coupling of HILIC to ESI-MS and ICP-MS. Anal Chim Acta 2023; 1242:340773. [PMID: 36657886 DOI: 10.1016/j.aca.2022.340773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Revised: 12/17/2022] [Accepted: 12/30/2022] [Indexed: 01/01/2023]
Abstract
Several proteins have been identified in the past decades as targets of uranyl (UO22+) in vivo. However, the molecular interactions responsible for this affinity are still poorly known which requires the identification of the UO22+ coordination sites in these proteins. Biomimetic peptides are efficient chemical tools to characterize these sites. In this work, we developed a dedicated analytical method to determine the affinity of biomimetic, synthetic, multi-phosphorylated peptides for UO22+ and evaluate the effect of several structural parameters of these peptides on this affinity at physiological pH. The analytical strategy was based on the implementation of the simultaneous coupling of hydrophilic interaction chromatography (HILIC) with electrospray ionization mass spectrometry (ESI-MS) and inductively coupled plasma mass spectrometry (ICP-MS). An essential step had been devoted to the definition of the best separation conditions of UO22+ complexes formed with di-phosphorylated peptide isomers and also with peptides of different structure and degrees of phosphorylation. We performed the first separations of several sets of UO22+ complexes by HILIC ever reported in the literature. A dedicated method had then been developed for identifying the separated peptide complexes online by ESI-MS and simultaneously quantifying them by ICP-MS, based on uranium quantification using external calibration. Thus, the affinity of the peptides for UO22+ was determined and made it possible to demonstrate that (i) the increasing number of phosphorylated residues (pSer) promotes the affinity of the peptides for UO22+, (ii) the position of the pSer in the peptide backbone has very low impact on this affinity (iii) and finally the cyclic structure of the peptide favors the UO22+ complexation in comparison with the linear structure. These results are in agreement with those previously obtained by spectroscopic techniques, which allowed to validate the method. Through this approach, we obtained essential information to better understand the mechanisms of toxicity of UO22+ at the molecular level and to further develop selective decorporating agents by chelation.
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Affiliation(s)
- Lana Abou-Zeid
- Université Paris-Saclay, CEA, Service d'Etudes Analytiques et de Réactivité des Surfaces, F-91191, Gif-sur-Yvette, France; Sorbonne Université, UPMC, F-75005, Paris, France
| | - Albert Pell
- Université Paris-Saclay, CEA, Service d'Etudes Analytiques et de Réactivité des Surfaces, F-91191, Gif-sur-Yvette, France
| | - Marta Garcia Cortes
- Université Paris-Saclay, CEA, Service d'Etudes Analytiques et de Réactivité des Surfaces, F-91191, Gif-sur-Yvette, France
| | - Hélène Isnard
- Université Paris-Saclay, CEA, Service d'Etudes Analytiques et de Réactivité des Surfaces, F-91191, Gif-sur-Yvette, France
| | - Pascale Delangle
- Univ. Grenoble Alpes, CEA, CNRS, GRE-INP, IRIG, SyMMES, 38 000, Grenoble, France
| | - Carole Bresson
- Université Paris-Saclay, CEA, Service d'Etudes Analytiques et de Réactivité des Surfaces, F-91191, Gif-sur-Yvette, France.
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Xue T, Wang W, Yang Z, Wang F, Yang L, Li J, Gan H, Gu R, Wu Z, Dou G, Meng Z. Accurate Determination of the Degree of Deacetylation of Chitosan Using UPLC-MS/MS. Int J Mol Sci 2022; 23:ijms23158810. [PMID: 35955947 PMCID: PMC9369293 DOI: 10.3390/ijms23158810] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 08/03/2022] [Accepted: 08/06/2022] [Indexed: 11/16/2022] Open
Abstract
The mole fraction of deacetylated monomeric units in chitosan (CS) molecules is referred to as CS's degree of deacetylation (DD). In this study, 35 characteristic ions of CS were detected using liquid chromatography-electrospray ionization-mass spectrometry (LC-ESI-MS/MS). The relative response intensity of 35 characteristic ion pairs using a single charge in nine CS samples with varying DDs was analyzed using 30 analytical methods. There was a good linear relationship between the relative response intensity of the characteristic ion pairs determined using ultrahigh performance (UP) LC-MS/MS and the DD of CS. The UPLC-MS/MS method for determining the DD of CS was unaffected by the sample concentration. The detection instrument has a wide range of application parameters with different voltages, high temperatures, and gas flow conditions. This study established a detection method for the DD of CS with high sensitivity, fast analysis, accuracy, stability, and durability.
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