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Touradj Solouki - One of the best experts on this subject based on the ideXlab platform.
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Loss of Internal Backbone Carbonyls: Additional Evidence for Sequence-Scrambling in Collision-Induced Dissociation of y-Type Ions
Journal of The American Society for Mass Spectrometry, 2014Co-Authors: Brett Harper, Mahsan Miladi, Touradj SoloukiAbstract:It is shown that y-type ions, after losing C-terminal H_2O or NH_3, can lose an internal backbone carbonyl (CO) from different peptide positions and yield structurally different product fragment ions upon collision-induced dissociation (CID). Such CO losses from internal peptide backbones of y-fragment ions are not unique to a single peptide and were observed in four of five model peptides studied herein. Experimental details on examples of CO losses from y-type fragment ions for an isotopically labeled AAAAH A A-NH_2 heptapeptide and des-acetylated-α-melanocyte-stimulating hormone (dα-MSH) (SYSMEHFRWGKPV-NH_2) are reported. Results from isotope labeling, tandem mass spectrometry (MS^n), and ion mobility-mass spectrometry (IM-MS) confirm that CO losses from different amino acids of m / z -isolated y-type ions yield structurally different ions. It is shown that losses of internal backbone carbonyls (as CID products of m / z -isolated y-type ions) are among intermediate steps towards formation of rearranged or permutated product fragment ions. Possible mechanisms for generation of the observed sequence-scrambled a-“like” ions, as intermediates in sequence-scrambling pathways of y-type ions, are proposed and discussed. ᅟ
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Loss of Internal Backbone Carbonyls: Additional Evidence for Sequence-Scrambling in Collision-Induced Dissociation of y-Type Ions
Journal of The American Society for Mass Spectrometry, 2014Co-Authors: Brett Harper, Mahsan Miladi, Touradj SoloukiAbstract:It is shown that y-type ions, after losing C-terminal H_2O or NH_3, can lose an internal backbone carbonyl (CO) from different peptide positions and yield structurally different product fragment ions upon collision-induced dissociation (CID). Such CO losses from internal peptide backbones of y-fragment ions are not unique to a single peptide and were observed in four of five model peptides studied herein. Experimental details on examples of CO losses from y-type fragment ions for an isotopically labeled AAAAH A A-NH_2 heptapeptide and des-acetylated-α-melanocyte-stimulating hormone (dα-MSH) (SYSMEHFRWGKPV-NH_2) are reported. Results from isotope labeling, tandem mass spectrometry (MS^n), and ion mobility-mass spectrometry (IM-MS) confirm that CO losses from different amino acids of m / z -isolated y-type ions yield structurally different ions. It is shown that losses of internal backbone carbonyls (as CID products of m / z -isolated y-type ions) are among intermediate steps towards formation of rearranged or permutated product fragment ions. Possible mechanisms for generation of the observed sequence-scrambled a-“like” ions, as intermediates in sequence-scrambling pathways of y-type ions, are proposed and discussed. ᅟ
Brett Harper - One of the best experts on this subject based on the ideXlab platform.
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Loss of Internal Backbone Carbonyls: Additional Evidence for Sequence-Scrambling in Collision-Induced Dissociation of y-Type Ions
Journal of The American Society for Mass Spectrometry, 2014Co-Authors: Brett Harper, Mahsan Miladi, Touradj SoloukiAbstract:It is shown that y-type ions, after losing C-terminal H_2O or NH_3, can lose an internal backbone carbonyl (CO) from different peptide positions and yield structurally different product fragment ions upon collision-induced dissociation (CID). Such CO losses from internal peptide backbones of y-fragment ions are not unique to a single peptide and were observed in four of five model peptides studied herein. Experimental details on examples of CO losses from y-type fragment ions for an isotopically labeled AAAAH A A-NH_2 heptapeptide and des-acetylated-α-melanocyte-stimulating hormone (dα-MSH) (SYSMEHFRWGKPV-NH_2) are reported. Results from isotope labeling, tandem mass spectrometry (MS^n), and ion mobility-mass spectrometry (IM-MS) confirm that CO losses from different amino acids of m / z -isolated y-type ions yield structurally different ions. It is shown that losses of internal backbone carbonyls (as CID products of m / z -isolated y-type ions) are among intermediate steps towards formation of rearranged or permutated product fragment ions. Possible mechanisms for generation of the observed sequence-scrambled a-“like” ions, as intermediates in sequence-scrambling pathways of y-type ions, are proposed and discussed. ᅟ
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Loss of Internal Backbone Carbonyls: Additional Evidence for Sequence-Scrambling in Collision-Induced Dissociation of y-Type Ions
Journal of The American Society for Mass Spectrometry, 2014Co-Authors: Brett Harper, Mahsan Miladi, Touradj SoloukiAbstract:It is shown that y-type ions, after losing C-terminal H_2O or NH_3, can lose an internal backbone carbonyl (CO) from different peptide positions and yield structurally different product fragment ions upon collision-induced dissociation (CID). Such CO losses from internal peptide backbones of y-fragment ions are not unique to a single peptide and were observed in four of five model peptides studied herein. Experimental details on examples of CO losses from y-type fragment ions for an isotopically labeled AAAAH A A-NH_2 heptapeptide and des-acetylated-α-melanocyte-stimulating hormone (dα-MSH) (SYSMEHFRWGKPV-NH_2) are reported. Results from isotope labeling, tandem mass spectrometry (MS^n), and ion mobility-mass spectrometry (IM-MS) confirm that CO losses from different amino acids of m / z -isolated y-type ions yield structurally different ions. It is shown that losses of internal backbone carbonyls (as CID products of m / z -isolated y-type ions) are among intermediate steps towards formation of rearranged or permutated product fragment ions. Possible mechanisms for generation of the observed sequence-scrambled a-“like” ions, as intermediates in sequence-scrambling pathways of y-type ions, are proposed and discussed. ᅟ
Jack Harrowfield - One of the best experts on this subject based on the ideXlab platform.
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uranyl ion complexes with long chain aliphatic α ω dicarboxylates and 3d block metal counterions
Inorganic Chemistry, 2016Co-Authors: Pierre Thuéry, Jack HarrowfieldAbstract:Twelve new complexes were obtained from reaction of uranyl ions with the aliphatic dicarboxylic acids HOOC–(CH2)n−2–COOH (H2Cn; n = 7–10 and 12) under solvo-hydrothermal conditions, in the presence of 3d-block metal ions (Mn2+, Fe3+, Co2+, Ni2+, and Cu2+) and 2,2′-bipyridine (bipy) or 1,10-phenanthroline (phen). In contrast to previously reported triple-stranded helicates obtained with C92– and C122–, all these complexes crystallize as polymeric one-dimensional (1D) or two-dimensional (2D) species. [Fe(bipy)3][(UO2)2(C7)3]·3H2O (1), [Cu(phen)2]2[(UO2)3(C7)4(H2O)2]·2H2O (2), and [Cu(bipy)2]2[(UO2)2(C9)3] (6), in which the 3d cation was reduced in situ, are 1D ladderlike polymers displaying tetra- or hexanuclear rings, of sufficient width to encompass two counterions in 2 and 6. The three complexes [Co(phen)3][(UO2)3(C8)3(O)]·H2O (3), [Ni(phen)3][(UO2)3(C8)3(O)]·H2O (4) and [Co(phen)3][(UO2)3(C9)3(O)]·H2O (5) contain bis(μ3-oxo)-bridged tetranuclear secondary building units, and they crystallize as deeply f...
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Uranyl Ion Complexes with Long-Chain Aliphatic α,ω-Dicarboxylates and 3d-Block Metal Counterions
Inorganic Chemistry, 2016Co-Authors: Pierre Thuéry, Jack HarrowfieldAbstract:Twelve new complexes were obtained from reaction of uranyl ions with the aliphatic dicarboxylic acids HOOC−(CH 2) n−2 −COOH (H 2 Cn; n = 7−10 and 12) under solvo-hydrothermal conditions, in the presence of 3d-block metal ions (Mn 2+ , Fe 3+ , Co 2+ , Ni 2+ , and Cu 2+) and 2,2′-bipyridine (bipy) or 1,10-phenanthro-line (phen). In contrast to previously reported triple-stranded helicates obtained with C9 2− and C12 2− , all these complexes crystallize as polymeric one-dimensional (1D) or two-dimensional (2D) species. [Fe(bipy) 3 ][(UO 2) 2 (C7) 3 ]·3H 2 O (1), [Cu(phen) 2 ] 2 [(UO 2) 3 (C7) 4 (H 2 O) 2 ]·2H 2 O (2), and [Cu(bipy) 2 ] 2 [(UO 2) 2 (C9) 3 ] (6), in which the 3d cation was reduced in situ, are 1D ladderlike polymers displaying tetra-or hexanuclear rings, of sufficient width to encompass two counterions in 2 and 6. The three complexes [Co(phen) 3 ][(UO 2) 3 (C8) 3 (O)]·H 2 O (3), [Ni(phen) 3 ][(UO 2) 3 (C8) 3 (O)]·H 2 O (4) and [Co(phen) 3 ][(UO 2) 3 (C9) 3 (O)]·H 2 O (5) contain bis(μ 3-oxo)-bridged tetranuclear secondary building units, and they crystallize as deeply furrowed 2D assemblies. Depending on the nature of the counterion, C10 2− gives [Ni(bipy) 3 ][(UO 2) 2-(C10) 3 ]·2H 2 O (7), a 2D network displaying elongated decanuclear rings containing the counterions, or [Mn(phen) 3 ]-[(UO 2) 2 (C10) 3 ]·6H 2 O (8), [Co(phen) 3 ][(UO 2) 2 (C10) 3 ]·7H 2 O (9), and [Ni(phen) 3 ][(UO 2) 2 (C10) 3 ]·7H 2 O (10), which consist of 2D assemblies with honeycomb topology; the hexanuclear rings in 8−10 are chairlike and occupied by one counterion and two uranyl groups from neighboring layers. Two complexes of the ligand with the longest chain, C12 2−
Mahsan Miladi - One of the best experts on this subject based on the ideXlab platform.
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Loss of Internal Backbone Carbonyls: Additional Evidence for Sequence-Scrambling in Collision-Induced Dissociation of y-Type Ions
Journal of The American Society for Mass Spectrometry, 2014Co-Authors: Brett Harper, Mahsan Miladi, Touradj SoloukiAbstract:It is shown that y-type ions, after losing C-terminal H_2O or NH_3, can lose an internal backbone carbonyl (CO) from different peptide positions and yield structurally different product fragment ions upon collision-induced dissociation (CID). Such CO losses from internal peptide backbones of y-fragment ions are not unique to a single peptide and were observed in four of five model peptides studied herein. Experimental details on examples of CO losses from y-type fragment ions for an isotopically labeled AAAAH A A-NH_2 heptapeptide and des-acetylated-α-melanocyte-stimulating hormone (dα-MSH) (SYSMEHFRWGKPV-NH_2) are reported. Results from isotope labeling, tandem mass spectrometry (MS^n), and ion mobility-mass spectrometry (IM-MS) confirm that CO losses from different amino acids of m / z -isolated y-type ions yield structurally different ions. It is shown that losses of internal backbone carbonyls (as CID products of m / z -isolated y-type ions) are among intermediate steps towards formation of rearranged or permutated product fragment ions. Possible mechanisms for generation of the observed sequence-scrambled a-“like” ions, as intermediates in sequence-scrambling pathways of y-type ions, are proposed and discussed. ᅟ
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Loss of Internal Backbone Carbonyls: Additional Evidence for Sequence-Scrambling in Collision-Induced Dissociation of y-Type Ions
Journal of The American Society for Mass Spectrometry, 2014Co-Authors: Brett Harper, Mahsan Miladi, Touradj SoloukiAbstract:It is shown that y-type ions, after losing C-terminal H_2O or NH_3, can lose an internal backbone carbonyl (CO) from different peptide positions and yield structurally different product fragment ions upon collision-induced dissociation (CID). Such CO losses from internal peptide backbones of y-fragment ions are not unique to a single peptide and were observed in four of five model peptides studied herein. Experimental details on examples of CO losses from y-type fragment ions for an isotopically labeled AAAAH A A-NH_2 heptapeptide and des-acetylated-α-melanocyte-stimulating hormone (dα-MSH) (SYSMEHFRWGKPV-NH_2) are reported. Results from isotope labeling, tandem mass spectrometry (MS^n), and ion mobility-mass spectrometry (IM-MS) confirm that CO losses from different amino acids of m / z -isolated y-type ions yield structurally different ions. It is shown that losses of internal backbone carbonyls (as CID products of m / z -isolated y-type ions) are among intermediate steps towards formation of rearranged or permutated product fragment ions. Possible mechanisms for generation of the observed sequence-scrambled a-“like” ions, as intermediates in sequence-scrambling pathways of y-type ions, are proposed and discussed. ᅟ
Md Rabiul Awual - One of the best experts on this subject based on the ideXlab platform.
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optimization of an innovative composited material for effective monitoring and removal of cobalt ii from wastewater
Journal of Molecular Liquids, 2020Co-Authors: Md Rabiul Awual, Md Munjur Hasan, Aminul Islam, Abdullah M Asiri, Mohammed M RahmanAbstract:Abstract A newly designed composite adsorbent (CpAD), ultra-trace detection ability and a superior adsorption capability to that novel material, was fabricated by functional ligand (3-(((5-ethoxybenzenethiol)imino)methyl)–salicylic acid) combining with mesoporous silica. The resultant CpAD was maintained a high surface area with ordered porosity even after successful ligand anchoring. The application of cobalt (Co(II)) detection and adsorption was measured at an optimum experimental protocol with exhibition of significant color visualization. The experiment conditions were optimized based on contact time, solution pH, initial Co(II) concentration and diverse competing metal ions. The CpAD was able to detect the low level Co(II) ion as the detection limit was 0.39 μg/L. The data were clarified that the CpAD was not affected with the existing competing ions and the signal intensity and specific color was observed only toward the Co(II) ion. When used as an adsorbent, the CpAD was demonstrated a very quick adsorption property for the removal of Co(II) ions. The adsorption capability approaches 185.23 mg/g, which is one of the highest capabilities of today's materials. The data also revealed that the removal capabilities of the CpAD for Co(II) ions depended on the material functionality and initial concentration of Co(II) ions. The elution of Co(II) ions from the saturated composite adsorbent was desorbed successfully with 0.30 M HCl. The regenerated adsorbent that remained maintained the high selectivity to Co(II) ions and exhibited almost the same adsorption capacity as that of the original adsorbent. The highest percentage adsorption of Co(II) exceeds 96% in the presence of competing ion, indicating that the CpAD is one of the very suitable composite adsorbent in environmental pollution management.
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inorganic organic based novel nano conjugate material for effective cobalt ii ions capturing from wastewater
Chemical Engineering Journal, 2017Co-Authors: Md Rabiul Awual, Nabeel H Alharthi, Md Munjur Hasan, Mohammad Rezaul Karim, Aminul Islam, Hussein Znad, Mohammed Akhter Hossain, Md Ershad Halim, Mohammed M RahmanAbstract:Abstract Simultaneous detection and removal of heavy metals with high sensitivity and adsorption capacity of a suitable material is an ultimate goal in industry for the purification of contaminated water samples. This study was investigated the use of functional ligand immobilized mesoporous silica based nano-conjugate materials for efficient detection and removal of cobalt (Co(II)) ions from wastewaters with optical color optimization. The mesoporous silica, newly prepared organic ligand and the nano-conjugate materials were characterized systematically. The effect of pH on the sensitivity and selectivity of the formed complexes was studied after adding the Co(II) ions in specific condition. Under optimum conditions, the nano-conjugate materials was formed visible color after capturing of the Co(II) ions. The data of calibration graphs were linear in the low concentration level of Co(II) ions with the detection limit of 0.33 µg/L. The performance of the solid-phase adsorption was enriched the Co(II) ions efficiently into the materials surface. The kinetic performance was high and the isotherm study was conducted using the Langmuir adsorption model. The results exhibited very high adsorption capacity of 170.17 mg/g and this capacity was compared with different forms of materials. In addition, the materials was adsorbed the Co(II) ions with higher 96% from the synthetic multi-mixture metal ions containing samples and this is confirmed the materials high selectivity for efficient detection and adsorption of Co(II) ions. Desorption experiments were carried out with 0.30 M HCl proved that without significant loss in its original performance that could be reused in several cycles. Therefore, the proposed materials here is an interesting and promising attempt for the trace Co(II) ions capturing in water samples and will have much more applied field.
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simultaneous optical detection and extraction of cobalt ii from lithium ion batteries using nanocollector monoliths
Sensors and Actuators B-chemical, 2013Co-Authors: Md Rabiul Awual, Sherif A Elsafty, Mohamed A Shenashen, Ahmed ShahatAbstract:This study aims to develop novel nanocollectors for potential application in cobalt [Co(II)] detection and removal from lithium ion batteries. The optical nanocollectors were fabricated through functional immobilization of 2-nitroso-1-naphthol, bis[N,N-bis(carboxymethyl) aminomethyl]fluorescein, and pyrogallol red chromophore probes into large, open, cage-pored, three-dimensional cubic mesostructures with micrometer-sized monolith particles. The monolithic nanocollectors are stable and easy to use, and they have sensitive detection capabilities for low Co(II) ion concentrations. The construction of these probes into highly ordered pore-based monoliths transform ion sensing and removal systems into smart, stable assemblies and portable laboratory assays. The experiments were conducted to determine the effects of feed solution pH, concentration, and competing ions on the selective detection and removal of Co(II) ions. Solution pH played an important role in the selective removal of Co(II) ions. The nanocollectors were able to detect Co(II) ions selectively despite high concentrations of interfering ions. The unique features of the nanocollectors allow the visual detection, removal, and extraction of ultratrace concentrations of Co(II) ions without preconcentration. The adsorbed Co(II) was eluted/extracted with stripping agents and the nanocollectors were simultaneously regenerated for subsequent removal operations after rinsing with water. The nanocollectors retained their functionality despite several chemical treatments during the removal–extraction–regeneration cycles. Therefore, large-scale pilot studies are recommended to confirm these promising results.