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Alam H, Ozesme Taylan G, Yamali C, Oztop MH. Synergistic quantification of mixed insulin preparations using time domain NMR techniques. J Pharm Biomed Anal 2024; 247:116260. [PMID: 38823221 DOI: 10.1016/j.jpba.2024.116260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2024] [Revised: 05/23/2024] [Accepted: 05/24/2024] [Indexed: 06/03/2024]
Abstract
Diabetes patients often rely on tailored insulin therapies, necessitating precise blends of various insulin types to achieve optimal pharmacokinetic profiles, including the quantity and action duration of insulin absorption into the bloodstream. This study aimed to develop an accurate quantification method for mixed insulin preparations, consisting of Insulin-NPH and Insulin Regular in ratios varying between 0:100-100:0. Time Domain NMR (TD-NMR) techniques, T2 relaxation times, and T1T2 maps were used to analyze the mixtures. Individually, neither technique provided a reliable determination of insulin ratios. However, the integration of both methods through chemometrics has been proven to be a synergistic approach, yielding a robust quantification technique suitable for quality control in the assessment of mixed insulin drugs. This innovative combined TD-NMR method is non-invasive, cost-effective, and user-friendly, offering at the same time a significant potential for preventing health complications associated with improper insulin dosing. Furthermore, our work elucidates the broader applicability of converging multiple TD-NMR techniques for analyzing intricate mixtures.
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Affiliation(s)
- Hani Alam
- Department of Biotechnology, Graduate School of Natural and Applied Sciences, Middle East Technical University, Çankaya, Ankara 06800, Turkey
| | - Gozde Ozesme Taylan
- Department of Biotechnology, Graduate School of Natural and Applied Sciences, Middle East Technical University, Çankaya, Ankara 06800, Turkey
| | - Cem Yamali
- Department of Basic Pharmaceutical Sciences, Faculty of Pharmacy, Çukurova University, Sarıçam, Adana 01330, Turkey
| | - Mecit H Oztop
- Department of Biotechnology, Graduate School of Natural and Applied Sciences, Middle East Technical University, Çankaya, Ankara 06800, Turkey; Department of Food Engineering, Faculty of Engineering, Middle East Technical University, Çankaya, Ankara 06800, Turkey.
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Zhang M, Inoue S, Matsumura Y. Mechanism simulation of polar and nonpolar organic solvent vapor adsorption on a multiwall carbon nanotubes paper gas sensor. RSC Adv 2024; 14:24985-24991. [PMID: 39131492 PMCID: PMC11310837 DOI: 10.1039/d4ra04474f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2024] [Accepted: 08/03/2024] [Indexed: 08/13/2024] Open
Abstract
We investigate the adsorption behavior of polar and nonpolar molecules on carbon nanotube interfaces through computational simulations. Gaussian 16 was utilized to calculate the total energy of each possible molecular structure and analyze the adsorption mechanisms in stacked and inline configurations. The study reveals that nonpolar molecules favor stacked adsorption on two graphene interfaces, while polar molecules prefer inline adsorption. The findings suggest that inline adsorption of polar molecules results in minimal changes to the local dielectric constant, which may explain the absence of multi-step adsorption isotherms. The research examines the stability and energetics of molecular adsorption on graphene layers simulating CNT interfaces. Different types of molecules (polar and nonpolar) exhibit distinct adsorption behaviors, with nonpolar molecules aligning with the IUPAC type VI isotherm model and polar molecules following the Langmuir isotherm model (IUPAC type I). This study provides insight into how molecules are likely to adsorb on CNT surfaces and the impact on the local dielectric constant. This understanding has implications for the design and optimization of CNT-based sensors, particularly in detecting organic solvents and gases in various environments.
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Affiliation(s)
- Mengli Zhang
- Graduate School of Advanced Science and Engineering, Hiroshima University Higashi-Hiroshima 739-8527 Japan
| | - Shuhei Inoue
- Department of Mechanical Engineering, Kindai University Higashi-Hiroshima 739-2116 Japan
| | - Yukihiko Matsumura
- Graduate School of Advanced Science and Engineering, Hiroshima University Higashi-Hiroshima 739-8527 Japan
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Low-field time-domain NMR relaxometry for studying polymer hydration and mobilization in sodium alginate matrix tablets. Carbohydr Polym 2023; 299:120215. [PMID: 36876817 DOI: 10.1016/j.carbpol.2022.120215] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 09/26/2022] [Accepted: 10/08/2022] [Indexed: 11/09/2022]
Abstract
Sodium alginate is used in various industries, including food, pharmaceutical, and agriculture. Matrix systems, e.g., tablets, and granules, are macro samples with incorporated active substances. During hydration, they are neither equilibrated nor homogenous. Phenomena occurring during hydration of such systems are complex, determine their functional properties and hence require multimodal analysis. Still, there's a lack of comprehensive view. The study aimed to obtain unique characteristics of the sodium alginate matrix during hydration, particularly considering polymer mobilization phenomena using low-field time-domain NMR relaxometry in H2O and D2O. An increase in total signal during 4 h of hydration in D2O of ca. 30 μV resulted from polymer/water mobilization. Modes in T1-T2 maps and changes in their amplitudes reflected physicochemical state of the polymer/water system: e.g. air-dry polymer mode (T1/T2 ~ 600) and two mobilized polymer/water modes (at T1/T2 ~ 40 and T1/T2 ~ 20). The study describes the approach to evaluating the hydration of the sodium alginate matrix in terms of the temporal evolution of proton pools: those existing in the matrix before hydration and those entering the matrix from the bulk water. It provides data complementary to spatially resolved methods like MRI and microCT.
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Tsuji T, Ono T, Taguchi H, Leong KH, Hayashi Y, Kumada S, Okada K, Onuki Y. Continuous Monitoring of the Hydration Behavior of Hydrophilic Matrix Tablets Using Time-Domain NMR. Chem Pharm Bull (Tokyo) 2023; 71:576-583. [PMID: 37394606 DOI: 10.1248/cpb.c23-00214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/04/2023]
Abstract
Time-domain NMR (TD-NMR) was used for continuous monitoring of the hydration behavior of hydrophilic matrix tablets. The model matrix tablets comprised high molecular weight polyethylene oxide (PEO), hydroxypropyl methylcellulose (HPMC), and polyethylene glycol (PEG). The model tablets were immersed in water. Their T2 relaxation curves were acquired by TD-NMR with solid-echo sequence. A curve-fitting analysis was conducted on the acquired T2 relaxation curves to identify the NMR signals corresponding to the nongelated core remaining in the samples. The amount of nongelated core was estimated from the NMR signal intensity. The estimated values were consistent with the experiment measurement values. Next, the model tablets immersed in water were monitored continuously using TD-NMR. The difference in hydration behaviors of the HPMC and PEO matrix tablets was then characterized fully. The nongelated core of the HPMC matrix tablets disappeared more slowly than that of the PEO matrix tablets. The behavior of HPMC was significantly affected by the PEG content in the tablets. It is suggested that the TD-NMR method has potential to be utilized to evaluate the gel layer properties, upon replacement of the immersion medium: purified (nondeuterated) water is replaced with heavy (deuterated) water. Finally, drug-containing matrix tablets were tested. Diltiazem hydrochloride (a highly water-soluble drug) was employed for this experiment. Reasonable in vitro drug dissolution profiles, which were in accordance with the results from TD-NMR experiments, were observed. We concluded that TD-NMR is a powerful tool to evaluate the hydration properties of hydrophilic matrix tablets.
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Affiliation(s)
- Takahiro Tsuji
- Formulation Development Department, Development & Planning Division, Nichi-Iko Pharmaceutical Co., Ltd
| | - Takashi Ono
- Formulation Development Department, Development & Planning Division, Nichi-Iko Pharmaceutical Co., Ltd
- Laboratory of Pharmaceutical Technology, School of Pharmacy and Pharmaceutical Sciences, University of Toyama
| | - Hiromu Taguchi
- Laboratory of Pharmaceutical Technology, School of Pharmacy and Pharmaceutical Sciences, University of Toyama
| | - Kok Hoong Leong
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Malaya
| | - Yoshihiro Hayashi
- Formulation Development Department, Development & Planning Division, Nichi-Iko Pharmaceutical Co., Ltd
| | - Shungo Kumada
- Formulation Development Department, Development & Planning Division, Nichi-Iko Pharmaceutical Co., Ltd
| | - Kotaro Okada
- Laboratory of Pharmaceutical Technology, School of Pharmacy and Pharmaceutical Sciences, University of Toyama
| | - Yoshinori Onuki
- Laboratory of Pharmaceutical Technology, School of Pharmacy and Pharmaceutical Sciences, University of Toyama
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Tsuji T, Kobayashi R, Hayashi Y, Kumada S, Mizuguchi M, Okada K, Onuki Y. Determination of Hardness of a Pharmaceutical Oral Jelly by Using <i>T</i><sub>2</sub> Relaxation Behavior Measured by Time-Domain NMR. Chem Pharm Bull (Tokyo) 2022; 70:558-565. [DOI: 10.1248/cpb.c22-00261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Takahiro Tsuji
- Formulation Development Department, Development & Planning Division, Nichi-Iko Pharmaceutical Co., Ltd
| | - Ryosuke Kobayashi
- Laboratory of Pharmaceutical Technology, School of Pharmacy and Pharmaceutical Sciences, University of Toyama
| | - Yoshihiro Hayashi
- Formulation Development Department, Development & Planning Division, Nichi-Iko Pharmaceutical Co., Ltd
| | - Shungo Kumada
- Formulation Development Department, Development & Planning Division, Nichi-Iko Pharmaceutical Co., Ltd
| | - Mineyuki Mizuguchi
- Laboratory of Structural Biology, School of Pharmacy and Pharmaceutical Sciences, University of Toyama
| | - Kotaro Okada
- Laboratory of Pharmaceutical Technology, School of Pharmacy and Pharmaceutical Sciences, University of Toyama
| | - Yoshinori Onuki
- Laboratory of Pharmaceutical Technology, School of Pharmacy and Pharmaceutical Sciences, University of Toyama
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Surangsrirat D, Sridhar V, Srikun O, Puanglamjeak M, Birdi P, Dumnin S, Thanawattano C, Chana KS. Non-destructive measurement technique for water content in organic solvents based on a thermal approach. RSC Adv 2022; 12:6181-6185. [PMID: 35424568 PMCID: PMC8981578 DOI: 10.1039/d2ra00352j] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Accepted: 02/09/2022] [Indexed: 11/21/2022] Open
Abstract
The water content of organic solvents is one of the crucial properties that affect the quality of the products and the efficiency of the manufacturing processes. The established water determination methods such as Karl Fischer titration and gas chromatography require skilled operators, specific reagents, and prolonged measurement time. Thus, they are not suitable for both on-line and in-line applications. In this study, we aim to develop a real-time and low-cost device with reliable accuracy. The proposed device based on a newly developed thermal approach could non-destructively detect the water content in multiple organic solvents at low concentrations with high accuracy and without the use of any specific reagent. Experiments were performed for the determination of water content in organic solvents such as methanol, ethanol, and isopropanol. The results show that the proposed device is feasible for the water content determination in methanol, ethanol, and isopropanol at 0–1% w/w. A Bland–Altman plot to illustrate the differences in measurements between the proposed device and coulometric Karl Fischer titration shows that most of the measurements lie within the limits of agreement where 95% of the differences between the two methods are expected to fall in the range of −0.13% and 0.09%. The proposed device could non-destructively detect the water content in organic solvents at low concentrations with high accuracy and without any specific reagent. It could determine the water content in methanol, ethanol, and isopropanol at 0–1% w/w.![]()
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Affiliation(s)
- Decho Surangsrirat
- Assistive Technology and Medical Devices Research Center, National Science and Technology Development Agency, Pathum Thani, Thailand
| | - Vikram Sridhar
- Department of Engineering Science, University of Oxford, Oxford, England
| | - Onsiri Srikun
- Pharmaceutical Ingredient Research Group, The Government Pharmaceutical Organization, Bangkok, Thailand
| | - Mananya Puanglamjeak
- Assistive Technology and Medical Devices Research Center, National Science and Technology Development Agency, Pathum Thani, Thailand
| | | | - Songphon Dumnin
- Assistive Technology and Medical Devices Research Center, National Science and Technology Development Agency, Pathum Thani, Thailand
| | - Chusak Thanawattano
- Assistive Technology and Medical Devices Research Center, National Science and Technology Development Agency, Pathum Thani, Thailand
| | - Kam S. Chana
- Department of Engineering Science, University of Oxford, Oxford, England
- Proxisense Limited, Oxford, England
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