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Almeida LS, Garcia RHDS, Ticona J, Cuffini SL, deAzevedo ER, Colnago LA. NMR Longitudinal Rotating Frame Relaxation Time (T 1ρ) with a Weak Spin Locking Field as an Approach to Characterize Solid-State Active Pharmaceutical Ingredients: Proof of Concept. Anal Chem 2024; 96:8317-8324. [PMID: 38739544 DOI: 10.1021/acs.analchem.3c04935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2024]
Abstract
Nuclear magnetic resonance (NMR) longitudinal rotating frame relaxation time (T1ρ), rarely used in low-field NMR, can be more effective than conventional T1 and T2 relaxation times to differentiate polymorphic forms of solid pharmaceuticals. This could be attributed to T1ρ sensibility to structural and molecular dynamics that can be enhanced by changing the strength of the oscillating magnetic field (B1) of spinlock pulses. Here, we compared the capacity of T1, T2, and T1ρ to differentiate inactive (A) and active (C) crystalline forms of the World Health Organization essential drug Mebendazole. The results showed that T1 and T2 values of both forms were statistically identical at 0.47 T. Conversely, T1ρ of both forms measured with weak spinlock B1 fields, ranging from 0.08 to 0.80 mT were statistically different in the same spectrometer. The T1ρ also has the limit of detection to detect the presence of at least 10% of inactive A form in the active C form. Therefore, T1ρ, measured with weak spinlock B1 fields can be an effective, streamlined, and complementary approach for characterizing not only solid active pharmaceutical ingredients but other solid-state materials as well.
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Affiliation(s)
- Luisa Souza Almeida
- São Carlos Institute of Chemistry, University of São Paulo, 13566-590 São Carlos, Brazil
| | | | - Julian Ticona
- Instituto de Ciência e Tecnologia, Universidade Federal de São Paulo, 12231-280 São José dos Campos, Brazil
| | - Silvia L Cuffini
- Instituto de Ciência e Tecnologia, Universidade Federal de São Paulo, 12231-280 São José dos Campos, Brazil
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2
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Facchinatto WM, Dos Santos Garcia RH, Dos Santos DM, Fiamingo A, Menezes Flores DW, Campana-Filho SP, de Azevedo ER, Colnago LA. Fast-forward approach of time-domain NMR relaxometry for solid-state chemistry of chitosan. Carbohydr Polym 2021; 256:117576. [PMID: 33483071 DOI: 10.1016/j.carbpol.2020.117576] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2020] [Revised: 12/11/2020] [Accepted: 12/27/2020] [Indexed: 11/19/2022]
Abstract
Chitosans with different average degrees of acetylation and weight molecular weight were analyzed by time-domain NMR relaxometry using the recently proposed pulse sequence named Rhim and Kessemeier - Radiofrequency Optimized Solid-Echo (RK-ROSE) to acquire 1H NMR signal of solid-state materials. The NMR signal decay was composed of faster (tenths of μs) and longer components, where the mobile-part fraction exhibited an effective relaxation transverse time assigned to methyl hydrogens from N-acetyl-d-glucosamine (GlcNAc) units. The higher intrinsic mobility of methyl groups was confirmed via DIPSHIFT experiments by probing the 1H-13C dipolar interaction. RK-ROSE data were modeled by using Partial Least Square (PLS) multivariate regression, which showed a high coefficient of determination (R2 > 0.93) between RK-ROSE signal profile and average degrees of acetylation and crystallinity index, thus indicating that time-domain NMR consists in a promising tool for structural and morphological characterization of chitosan.
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Affiliation(s)
- William Marcondes Facchinatto
- Sao Carlos Institute of Chemistry, University of Sao Paulo, Av. Trabalhador sao-carlense 400, CEP 13566-590, Caixa Postal 780, Sao Carlos, SP, Brazil.
| | - Rodrigo Henrique Dos Santos Garcia
- Sao Carlos Institute of Chemistry, University of Sao Paulo, Av. Trabalhador sao-carlense 400, CEP 13566-590, Caixa Postal 780, Sao Carlos, SP, Brazil
| | - Danilo Martins Dos Santos
- Brazilian Corporation for Agricultural Research, Embrapa Instrumentation, Rua XV de Novembro 1452, CEP 13560-970, Caixa Postal 741, Sao Carlos, SP, Brazil
| | - Anderson Fiamingo
- Sao Carlos Institute of Physics, University of Sao Paulo, Av. Trabalhador sao-carlense 400, CEP 13566-590, Caixa Postal 369, Sao Carlos, SP, Brazil
| | - Douglas William Menezes Flores
- Superior College of Agriculture "Luiz de Queiroz", University of Sao Paulo, Av. Padua Dias 11, CEP 13418-900, Caixa Postal 9, Piracicaba, SP, Brazil
| | - Sérgio Paulo Campana-Filho
- Sao Carlos Institute of Chemistry, University of Sao Paulo, Av. Trabalhador sao-carlense 400, CEP 13566-590, Caixa Postal 780, Sao Carlos, SP, Brazil
| | - Eduardo Ribeiro de Azevedo
- Sao Carlos Institute of Physics, University of Sao Paulo, Av. Trabalhador sao-carlense 400, CEP 13566-590, Caixa Postal 369, Sao Carlos, SP, Brazil
| | - Luiz Alberto Colnago
- Brazilian Corporation for Agricultural Research, Embrapa Instrumentation, Rua XV de Novembro 1452, CEP 13560-970, Caixa Postal 741, Sao Carlos, SP, Brazil
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3
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Nie X, Su H, Chen X, Huang W, Huang L, Chen B, Miao H, Jiang J, Wang T, Zhang G. Persistent Radical Pairs between N‐Substituted Naphthalimide and Carbanion Exhibit p
K
a
‐Dependent UV/Vis Absorption. Chemistry 2020; 26:12743-12746. [DOI: 10.1002/chem.201905865] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Indexed: 12/23/2022]
Affiliation(s)
- Xiancheng Nie
- Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China 96 Jinzhai Road Hefei China
| | - Hao Su
- Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China 96 Jinzhai Road Hefei China
| | - Xiaoyu Chen
- Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China 96 Jinzhai Road Hefei China
| | - Wenhuan Huang
- Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China 96 Jinzhai Road Hefei China
| | - Linkun Huang
- Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China 96 Jinzhai Road Hefei China
| | - Biao Chen
- Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China 96 Jinzhai Road Hefei China
| | - Hui Miao
- Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China 96 Jinzhai Road Hefei China
| | - Jun Jiang
- Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China 96 Jinzhai Road Hefei China
| | - Tao Wang
- Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China 96 Jinzhai Road Hefei China
| | - Guoqing Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China 96 Jinzhai Road Hefei China
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4
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Chen F, Chen C, Zhao D, Zhang S, Ma G, Su Z, Li X. On-line monitoring of the sol-gel transition temperature of thermosensitive chitosan/β-glycerophosphate hydrogels by low field NMR. Carbohydr Polym 2020; 238:116196. [PMID: 32299576 DOI: 10.1016/j.carbpol.2020.116196] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 03/18/2020] [Accepted: 03/18/2020] [Indexed: 11/27/2022]
Abstract
A temperature controlled low field nuclear magnetic resonance (LF-NMR) T2 relaxometry technique based on the mobility changes of water trapped in hydrogels, was successfully used for on-line determination of the sol-gel transition temperature for chitosan/β-glycerophosphate (CS/GP) hydrogels in real time. The LF-NMR results indicated that the gelation temperature decreased gradually with increasing GP concentration, and the results were supported by both thermogravimetric differential scanning calorimetry (DSC) and rheological findings; however, LF-NMR allows non-destructive monitoring of samples during continuous heating. Moreover, as the mobility of water molecules varies greatly during the sol-gel phase transition, the LF-NMR measurement was more sensitive and accurate (RSD ≤ 0.1 %, n = 5) compared with DSC (RSD: 1.2 %-3.7 %, n = 5) and rheology (RSD: 1.1 %-2.3 %, n = 5).
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Affiliation(s)
- Fangyu Chen
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Chao Chen
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Dawei Zhao
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Songping Zhang
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Guanghui Ma
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Zhiguo Su
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
| | - Xiunan Li
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
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Monaretto T, Montrazi ET, Moraes TB, Souza AA, Rondeau-Mouro C, Colnago LA. Using T 1 as a direct detection dimension in two-dimensional time-domain NMR experiments using CWFP regime. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2020; 311:106666. [PMID: 31846810 DOI: 10.1016/j.jmr.2019.106666] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Revised: 12/05/2019] [Accepted: 12/06/2019] [Indexed: 06/10/2023]
Abstract
The transverse relaxation time (T2), measured with Carr-Purcell-Meiboom-Gill (CPMG) sequence, has been widely used to obtain the direct dimension data in two-dimension time domain NMR (2D TD-NMR). In this paper we are demonstrating that Continuous Wave Free Precession sequence, with low flip angle (CWFP-T1), can be an alternative to CPMG as direct detection dimension. CWFP-T1 is a fast single shot sequence, like CPMG, and yields an exponential signal governed predominantly by the longitudinal (T1) relaxation time. To obtain the correlations between T1 and T2 (T1-T2 maps) we are proposing the use of CPMG-CWFP-T1 pulse sequence. In this sequence CPMG encodes T2 information (indirect dimension) that modulates the CWFP-T1 (direct dimension) signal amplitudes. CPMG-CWFP-T1 experiments were compared with classical 2D sequences such as Saturation-Recovery-CPMG (SR-CPMG) and Inversion-Recovery-CPMG (IR-CPMG) sequence and yields similar results in phantom sample. The experimental time for the 2D sequences, using single scan, shows that SR-CPMG ≤ CPMG-CWFP-T1 < IR-CPMG. Experimental and simulated results demonstrated that 2D-CPMG-CWFP-T1 maps have higher resolution in T1 dimension than the techniques that uses CPMG as direct dimension. CPMG-CWFP-T1 sequence was also applied to study beef samples, and 2D maps showed higher resolution in the two fat signals than the classical IR-CPMG method.
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Affiliation(s)
- Tatiana Monaretto
- Instituto de Química de São Carlos, Universidade de São Paulo, Av. Trabalhador São-carlense 400, São Carlos, SP 13566-590, Brazil
| | - Elton Tadeu Montrazi
- Instituto de Física de São Carlos, Universidade de São Paulo, Av. Trabalhador São-carlense 400, São Carlos, SP 13566-590, Brazil
| | - Tiago Bueno Moraes
- Instituto de Física de São Carlos, Universidade de São Paulo, Av. Trabalhador São-carlense 400, São Carlos, SP 13566-590, Brazil
| | - Andre Alves Souza
- Schlumberger Brazil Technology Integration Center, Av. Rep. do Chile, 330, Torre Oeste, 18° andar, Rio de Janeiro, RJ 20031-170, Brazil
| | | | - Luiz Alberto Colnago
- Embrapa Instrumentação, Rua XV de Novembro 1452, São Carlos, SP 13560-970, Brazil.
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Kock FVC, Higuera-Padilla AR, Vigatto MDSS, Martin Neto L, Colnago LA. Magnetic resonance studies of copper (II) sorbitol complex, in solution, reveal a supramolecular structure compatible to the crystal structure. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2019; 57:404-411. [PMID: 30864253 DOI: 10.1002/mrc.4863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Revised: 02/23/2019] [Accepted: 03/04/2019] [Indexed: 06/09/2023]
Abstract
Although the Cu2+ -sorbitol complex [Cu2+ -Sorb] structure in crystalline state has been determined by X rays, it is not known in solution, where most studies of this complex are performed. Therefore, the goal of this work was to obtain information about the structure of this complex in aqueous solution using nuclear magnetic resonance and electron paramagnetic resonance spectroscopies. The magnetic resonance results indicate that the complex is formed at approximately pH 12. In this pH the sorbitol 1 H relaxation times were so short (broad line) that was not possible to use standard nuclear magnetic resonance parameters (nuclear Overhauser effect and spin-spin coupling constants values) to solve the three-dimensional structure. However, valuable structural information about the complex in solution was obtained. The relaxation results indicate that the Cu2+ ions are buried in the structure and not accessible to solvent; the 1 H and 13 C spectra shows strong paramagnetic shift effect indicating short distance between these nuclei and Cu2+ in the structure. No electron paramagnetic resonance signal was observed in pH 12 indicating strong Cu2+ - Cu2+ dipolar interaction, compatible to Cu2+ -Cu2+ distances measured in crystal, from 1.148 to 1.393 Angstroms. The complex self-diffusion coefficient (D) of 1.58 × 10-10 m2 /s value, determined by Diffusion-Ordered Spectroscopy, is compatible to a molecular weight of 3-6 KDa. Therefore, these results corroborate that the [Cu2+ -Sorb] complex is assembled in solution, at pH 12, with several structural parameters compatible to the toroidal hexadecacuprate supramolecular structure determined in solid state.
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7
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Applications of Continuous Wave Free Precession Sequences in Low-Field, Time-Domain NMR. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app9071312] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
This review discusses the theory and applications of the Continuous Wave Free Precession (CWFP) sequence in low-field, time-domain nuclear magnetic resonance (TD-NMR). CWFP is a special case of the Steady State Free Precession (SSFP) regime that is obtained when a train of radiofrequency pulses, separated by a time interval Tp shorter than the effective transverse relaxation time (T2*), is applied to a sample. Unlike regular pulsed experiments, in the CWFP regime, the amplitude is not dependent on T1. Therefore, Tp should be as short as possible (limited by hardware). For Tp < 0.5 ms, thousands of scans can be performed per second, and the signal to noise ratio can be enhanced by more than one order of magnitude. The amplitude of the CWFP signal is dependent on T1/T2; therefore, it can be used in quantitative analyses for samples with a similar relaxation ratio. The time constant to reach the CWFP regime (T*) is also dependent on relaxation times and flip angle (θ). Therefore, T* has been used as a single shot experiment to measure T1 using a low flip angle (5°) or T2, using θ = 180°. For measuring T1 and T2 simultaneously in a single experiment, it is necessary to use θ = 90°, the values of T* and M0, and the magnitude of CWFP signal |Mss|. Therefore, CWFP is an important sequence for TD-NMR, being an alternative to the Carr-Purcell-Meiboom-Gill sequence, which depends only on T2. The use of CWFP for the improvement of the signal to noise ratio in quantitative and qualitative analyses and in relaxation measurements are presented and discussed.
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8
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Drying process of sodium alginate edible films forming solutions studied by LF NMR. Food Chem 2018; 250:83-88. [DOI: 10.1016/j.foodchem.2018.01.043] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 12/15/2017] [Accepted: 01/04/2018] [Indexed: 12/20/2022]
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9
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Kirtil E, Cikrikci S, McCarthy MJ, Oztop MH. Recent advances in time domain NMR & MRI sensors and their food applications. Curr Opin Food Sci 2017. [DOI: 10.1016/j.cofs.2017.07.005] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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10
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Kock FVC, Monaretto T, Colnago LA. Time-domain NMR relaxometry as an alternative method for analysis of chitosan-paramagnetic ion interactions in solution. Int J Biol Macromol 2017; 98:228-232. [DOI: 10.1016/j.ijbiomac.2017.01.083] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Revised: 01/04/2017] [Accepted: 01/18/2017] [Indexed: 11/28/2022]
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