1
|
Abdollahi S, Raissi H, Farzad F. Examine stability polyvinyl alcohol-stabilized nanosuspensions to overcome the challenge of poor drug solubility utilizing molecular dynamic simulation. Sci Rep 2024; 14:17386. [PMID: 39075104 PMCID: PMC11286956 DOI: 10.1038/s41598-024-68362-2] [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: 04/13/2024] [Accepted: 07/23/2024] [Indexed: 07/31/2024] Open
Abstract
The pharmaceutical industry faces a significant challenge from the low water solubility of nearly 90% of newly developed Active Pharmaceutical Ingredients (APIs). Despite extensive efforts to improve solubility, approximately 40% of these APIs encounter commercialization hurdles, impacting drug efficacy. In this context, a promising strategy will be introduced in which nanosuspensions, particularly polyvinyl alcohol (PVA) as a stabilizer, are applied to increase drug solubility. In this work using molecular dynamics simulations, the nanosuspension of four poorly water-soluble drugs (flurbiprofen, bezafibrate, miconazole, and phenytoin) stabilized with PVA is investigated. The simulation data showed van der Waals energies between polyvinyl alcohol with flurbiprofen and bezafibrate are - 101.12 and - 58.42 kJ/mol, respectively. The results indicate that PVA is an effective stabilizer for these drugs, and superior interactions are obtained with flurbiprofen and bezafibrate. The study also explores the impact of PVA on water molecule diffusion, providing insights into the stability of nanosuspensions. Obtained results also provide valuable insights into hydrogen bond formation, diffusion coefficients, and nanosuspension stability, contributing to the rational design and optimization of pharmaceutical formulations.
Collapse
Affiliation(s)
| | - Heidar Raissi
- Department of Chemistry, University of Birjand, Birjand, Iran.
| | - Farzaneh Farzad
- Department of Chemistry, University of Birjand, Birjand, Iran
| |
Collapse
|
2
|
Weerapol Y, Jarerattanachat V, Limmatvapirat S, Limmatvapirat C, Manmuan S, Tubtimsri S. Unveiling the Molecular Dynamics, Anticancer Activity, and Stability of Spearmint Oil Nanoemulsions with Triglycerides. Mol Pharm 2024; 21:3151-3162. [PMID: 38804164 PMCID: PMC11220747 DOI: 10.1021/acs.molpharmaceut.3c01060] [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: 11/08/2023] [Revised: 05/17/2024] [Accepted: 05/17/2024] [Indexed: 05/29/2024]
Abstract
Although spearmint oil (SMO) has various pharmacological properties, especially for cancer treatment, its low water solubility results in poor bioavailability. This limits its application as a medicine. One possible solution is to the use of SMO in the form of nanoemulsion, which has already been shown to have anticancer effects. However, the mechanism of SMO nanoemulsion formation remains unclear. The objective of this study was to use molecular dynamics (MD) for clarifying the formation of SMO nanoemulsion with triglycerides (trilaurin, tripalmitin, and triolein) and Cremophor RH40 (PCO40). Nanoemulsions with different SMO:triglyceride ratios and triglyceride types were prepared and analyzed for anticancer activity, droplet size, droplet morphology, and stability. Despite switching the type of carrier oil, SMO nanoemulsions retained strong anticancer effects. A ratio of 80SMO:20triglycerides produced the smallest droplets (<100 nm) and exhibited excellent physical stability after a temperature cycling test. MD simulations showed that polyoxyethylenes of PCO40 are located at the water interface, stabilizing the emulsion structure in an egglike layer. Droplet size correlated with triglyceride concentration, which was consistent with the experimental findings. Decreasing triglyceride content, except for the 90SMO:10triglyceride ratio, led to a decrease in droplet sizes. Hydrogen bond analysis identified interactions between triglyceride-PCO40 and carvone-PCO40. Geometry analysis showed PCO40 had an "L-like" shape, which maximizes the hydrophilic interfaces. These findings highlight the value of MD simulations in understanding the formation mechanism of SMO and triglyceride nanoemulsions. In addition, it might also be beneficial to use MD simulations before the experiment to select the potential composition for nanoemulsions, especially essential oil nanoemulsions.
Collapse
Affiliation(s)
- Yotsanan Weerapol
- Faculty
of Pharmaceutical Sciences, Burapha University, Chonburi 20131, Thailand
| | - Viwan Jarerattanachat
- NSTDA
Supercomputer Center, National Electronics and Computer Technology
Center, National Science and Technology
Development Agency, Khlong
Luang, Pathumthani 12120, Thailand
| | - Sontaya Limmatvapirat
- Department
of Industrial Pharmacy, Faculty of Pharmacy, Silpakorn University, Nakhon
Pathom 73000, Thailand
| | - Chutima Limmatvapirat
- Department
of Industrial Pharmacy, Faculty of Pharmacy, Silpakorn University, Nakhon
Pathom 73000, Thailand
| | - Suwisit Manmuan
- Faculty
of Pharmaceutical Sciences, Burapha University, Chonburi 20131, Thailand
| | - Sukannika Tubtimsri
- Faculty
of Pharmaceutical Sciences, Burapha University, Chonburi 20131, Thailand
| |
Collapse
|
3
|
Gupta KM, Das S, Wong ABH, Chow PS. Formulation and Skin Permeation of Active-Loaded Lipid Nanoparticles: Evaluation and Screening by Synergizing Molecular Dynamics Simulations and Experiments. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:308-319. [PMID: 36573314 DOI: 10.1021/acs.langmuir.2c02550] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Encapsulation into nanoparticles (NPs) is a potential method to deliver pharmaceutical/cosmetic actives deep into the skin. However, understanding the NP formulations and underlying mechanism of active delivery to skin has scarcely been studied. We report a simulation platform that screens, evaluates, formulates, and provides atomic-resolution interpretation of NP-based formulations, and reveals the active permeation mechanism from NPs to skin. First, three actives, namely, ferulic acid (FA), clotrimazole (CZE), and tretinoin (TTN), and five lipid excipients' (Compritol, Precirol, Geleol, Gelot, Gelucire) combinations were screened by MD simulations for the best pairs. For each suggested pair, the actual active and lipid compositions for the synthesis of stable NP formulations were then obtained by experiments. MD simulations demonstrate that in NP formulations, FA and CZE actives are present at the surface of the NPs, whereas TTN actives are present at both the surface and interior of the NP core. The NP shapes obtained by simulation perfectly match with experiments. For each NP, separate MD simulations illustrate that active-loaded NPs approach the skin surface quickly, and then actives translocate from NP surface to skin surface followed by penetration of NPs through skin. The driving force for the translocation which initiates during the penetration process, is the stronger active-skin interaction compared to active-NP interaction. Permeation free energy indicates spontaneous transfer of actives from solution phase to the surface of the skin bilayer. The free energy barriers are increased in the order of FA < TTN < CZE. Significantly lower diffusions of actives are obtained in the main barrier region compared to bulk, and the average diffusion coefficients of actives are in the same order of magnitude (∼10-6 cm2/s). The estimated permeability coefficients (log P) of actives are mainly governed by free energy barriers. The study would facilitate the development of novel lipid-based NP formulations for personal-care/pharmaceutical applications.
Collapse
Affiliation(s)
- Krishna M Gupta
- Institute of Sustainability for Chemicals, Energy and Environment, A*STAR (Agency for Science, Technology and Research), 1 Pesek Road, Jurong Island627833, Singapore
| | - Surajit Das
- Institute of Sustainability for Chemicals, Energy and Environment, A*STAR (Agency for Science, Technology and Research), 1 Pesek Road, Jurong Island627833, Singapore
| | - Annie B H Wong
- Institute of Sustainability for Chemicals, Energy and Environment, A*STAR (Agency for Science, Technology and Research), 1 Pesek Road, Jurong Island627833, Singapore
| | - Pui Shan Chow
- Institute of Sustainability for Chemicals, Energy and Environment, A*STAR (Agency for Science, Technology and Research), 1 Pesek Road, Jurong Island627833, Singapore
| |
Collapse
|
4
|
Shen Y, Zou Y, Chen X, Li P, Rao Y, Yang X, Sun Y, Hu H. Antibacterial self-assembled nanodrugs composed of berberine derivatives and rhamnolipids against Helicobacter pylori. J Control Release 2020; 328:575-586. [PMID: 32946873 DOI: 10.1016/j.jconrel.2020.09.025] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 09/10/2020] [Accepted: 09/12/2020] [Indexed: 12/17/2022]
Abstract
The prevalence of infections with Helicobacter pylori (H. pylori) has progressively increased worldwide, which demonstrated to be closely correlated to its biofilm formation. H. pylori biofilms protect the bacteria by significantly decreasing their sensitivity to antibiotics. Moreover, H. pylori colonizes on the gastrointestinal tract epithelium which is covered by mucus layer, acting as another barrier to prevent antibacterial agents from reaching the colonization sites. Herein, we prepared four types of versatile self-assembled nanodrugs (BD/RHL NDs) containing lipophilic alkyl berberine derivatives (BDs) and rhamnolipids (RHL) to overcome the dual obstructions of both mucus layer and biofilms. Molecular dynamics simulations estimated that the driving forces for self-assembly of BD/RHL NDs were electrostatic and hydrophobic interactions. BD/RHL NDs, characterized by appropriate size, negative charge and enhanced hydrophilicity, successfully penetrated through mucus layer without interacting with mucins. In in vitro experiments, BD/RHL NDs exhibited substantial ability to eradicate H. pylori biofilms by destroying their extracellular polymeric substances (EPS) and killing planktonic H. pylori. Furthermore, BD/RHL NDs inhibited the adherence of H. pylori on both biotic and abiotic surfaces, therefore cut off the critical step of the biofilm re-formation which was associated with the recrudescence of infections. In an H. pylori-infected mice model, C10-BD/RHL NDs group showed 40 folds less remnant H. pylori and greater mucosal protection compared with the conventional clinical triple therapy. In conclusion, BD/RHL NDs could penetrate through mucus layer and effectively eradicate H. pylori biofilms in vitro and in vivo, providing a novel strategy for clinical treatment of biofilm-related infections.
Collapse
Affiliation(s)
- Yuanna Shen
- Lab of Pharmaceutics, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, PR China
| | - Yiqing Zou
- Lab of Pharmaceutics, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, PR China
| | - Xiaonan Chen
- Lab of Pharmaceutics, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, PR China
| | - Pengyu Li
- Lab of Pharmaceutics, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, PR China
| | - Yiqin Rao
- Lab of Pharmaceutics, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, PR China
| | - Xuan Yang
- Lab of Pharmaceutics, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, PR China
| | - Yingying Sun
- Lab of Pharmaceutics, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, PR China
| | - Haiyan Hu
- Lab of Pharmaceutics, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, PR China.
| |
Collapse
|
5
|
Taherimehr Z, Zaboli M, Torkzadeh-Mahani M. New insight into the molecular mechanism of the trehalose effect on urate oxidase stability. J Biomol Struct Dyn 2020; 40:1461-1471. [PMID: 33000700 DOI: 10.1080/07391102.2020.1828167] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Urate oxidase (EC 1.7.3.3) is a key enzyme in the purine metabolism which is applied in the treatment of gout and also, as a diagnostic reagent for uric acid detection. In the current study, the trehalose (TRE) effects as an additive on the structural stability and function of uricase were investigated. For recombinant expression of UOX in E. coli BL21 cells, firstly the coding sequence was subcloned into the pET-28a vector and after induction with IPTG, the recombinant UOX was purified by affinity chromatography using a Ni-NTA agarose column. To specify the trehalose effects on the urate oxidase (UOX) structure, optimum pH, optimum temperature, kinetic and thermodynamic parameters and also, the intrinsic fluorescence of UOX in the absence and presence of trehalose were examined. The UOX half-life is 24.32 min at 40 °C, whereas the UOX-TRE has a higher half-life (32.09 min) at this temperature. Generally, our findings confirm that trehalose has a protective effect on the enzyme structure. Optimum pH and temperature were 9 and 25 °C, respectively for both the naked and treated enzymes and their activity retained 42.18 and 64.80%, respectively after 48 h of incubation at room temperature. Also, theoretical results indicate that the random coil of the enzyme was converted to α-helix and β-sheet in the presence of trehalose which may preserve the integrity of the active site of the enzyme and increased the enzymatic activity. The MD simulation results indicated greater stability of the uricase structure in the presence of trehalose.Communicated by Ramaswamy H. Sarma.
Collapse
Affiliation(s)
- Zahra Taherimehr
- Department of Biotechnology, Institute of Science, High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman-Iran, Iran
| | - Maryam Zaboli
- Department of chemistry, Faculty of science, University of Birjand, Birjand, Iran
| | - Masoud Torkzadeh-Mahani
- Department of Biotechnology, Institute of Science, High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman-Iran, Iran
| |
Collapse
|
6
|
Dammak I, Sobral PJDA, Aquino A, Neves MAD, Conte‐Junior CA. Nanoemulsions: Using emulsifiers from natural sources replacing synthetic ones—A review. Compr Rev Food Sci Food Saf 2020; 19:2721-2746. [DOI: 10.1111/1541-4337.12606] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 07/10/2020] [Accepted: 07/11/2020] [Indexed: 01/02/2023]
Affiliation(s)
- Ilyes Dammak
- Food Science ProgramInstitute of Chemistry, Federal University of Rio de Janeiro Rio de Janerio Brazil
| | - Paulo José do Amaral Sobral
- Department of Food EngineeringFZEAUniversity of São Paulo Pirassununga São Paulo Brazil
- Food Research Center (FoRC)University of São Paulo Pirassununga São Pau Brazil
| | - Adriano Aquino
- Food Science ProgramInstitute of Chemistry, Federal University of Rio de Janeiro Rio de Janerio Brazil
- Nanotechnology NetworkCarlos Chagas Filho Research Support Foundation of the State of Rio de Janeiro Rio de Janerio Brazil
| | | | - Carlos Adam Conte‐Junior
- Food Science ProgramInstitute of Chemistry, Federal University of Rio de Janeiro Rio de Janerio Brazil
- Nanotechnology NetworkCarlos Chagas Filho Research Support Foundation of the State of Rio de Janeiro Rio de Janerio Brazil
| |
Collapse
|
7
|
Pirhadi S, Amani A. Molecular dynamics simulation of siRNA loading into a nanoemulsion as a potential carrier. J Mol Model 2020; 26:215. [PMID: 32712777 DOI: 10.1007/s00894-020-04471-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2019] [Accepted: 07/13/2020] [Indexed: 10/23/2022]
Abstract
Nanoemulsions are used as drug delivery carriers for different types of systems. Nanoemulsions can enhance solubilization property of poorly water-soluble drugs and increase the drug loading. In this study, we used a nanoemulsion composed of benzalkonium chloride as surfactant, cyclohexane as oil phase, and ethanol as co-surfactant in water, to load small interfering RNA (siRNA) molecule. The system was investigated by three coarse-grained molecular dynamics simulations. The results showed that siRNA attached to benzalkonium chloride on the surface of the nanoemulsion and the oil beads were located in the hydrophobic core of the nanoemulsion, which made its size larger. The ethanol beads distributed throughout the system and did not enter to the hydrophilic shell of the nanoemulsion. The nanoemulsion structure was a compact prolate ellipsoid shape, before and after carrying the siRNA. The average value of radius of gyration of the nanoemulsion was 1.68 nm before and after joining siRNA and the average value of physical radius was 2.17 nm.
Collapse
Affiliation(s)
- Somayeh Pirhadi
- Medicinal and Natural Products Chemistry Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Amir Amani
- Natural Products and Medicinal Plants Research Center, North Khorasan University of Medical Sciences, Bojnurd, Iran. .,Department of Medical Nanotechnology, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran.
| |
Collapse
|
8
|
Sharifi-Rad A, Mehrzad J, Darroudi M, Saberi MR, Chamani J. Oil-in-water nanoemulsions comprising Berberine in olive oil: biological activities, binding mechanisms to human serum albumin or holo-transferrin and QMMD simulations. J Biomol Struct Dyn 2020; 39:1029-1043. [PMID: 32000592 DOI: 10.1080/07391102.2020.1724568] [Citation(s) in RCA: 170] [Impact Index Per Article: 42.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Berberine is widely used in traditional Iranian medicine to treat diabetes and inflammatory conditions. This study was aimed at developing a method for the preparation of Berberine nanoparticles (Nano-Ber) in order to improve its aqueous-phase solubility and its complex formation with human serum albumin (HSA) and holo-transferrin (HTF) from the viewpoint of interaction behavior. Nano-Ber was prepared with olive oil as the oil phase, Tween 80 as the surfactant and Span 60 as the co-surfactant. Nano-Ber was obtained with a spherical shape and a mean particle size of 43.7 ± 3.6 nm, with an optimal oil:surfactant:co-surfactant ratio of 1:2:2, w/w/w. The antioxidant activity of Nano-Ber in comparison with Berberine was tested using DPPH and it was found that Nano-Ber had a large antioxidant activity. The cytotoxicity effects of Nano-Ber and Berberine on HepG2 were compared by MTT assay and detected in the treated HepG2 cells at concentrations up to 0.1 mM. The binding constants of HSA-Nano-Ber and HTF-Nano-Ber complexes formation were (2.93 ± 0.02) × 104 and (9.62 ± 0.03) × 103 M -1, respectively. Hydrogen bonds and van der Waals interactions were the predominant forces in the HSA-Nano-Ber and HTF-Nano-Ber complexes, and the process of Nano-Ber binding HSA and HTF was driven by ΔH 0 = -122.76 kJ mol-1, ΔS 0 = -325.49 J mol-1K-1 for HSA and ΔH 0 = -125.09 kJ mol-1, ΔS 0 = -43.37 J mol-1K-1 for HTF. The results of the simulation demonstrated that the Nano-Ber molecules were stabilized on the surface of final aggregates through both hydrophilic and hydrophobic interactions. Communicated by Ramaswamy Sarma.
Collapse
Affiliation(s)
- Atena Sharifi-Rad
- Department of Biochemistry, Faculty of Sciences, Neyshabur Branch, Islamic Azad University, Neyshabur, Iran
| | - Jamshid Mehrzad
- Department of Biochemistry, Faculty of Sciences, Neyshabur Branch, Islamic Azad University, Neyshabur, Iran
| | - Majid Darroudi
- Nuclear Medicine Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mohammad Reza Saberi
- Department of Chemistry, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Jamshidkhan Chamani
- Department of Biology, Faculty of Sciences, Mashhad Branch, Islamic Azad University, Mashhad, Iran
| |
Collapse
|
9
|
Ghanbari-Ardestani S, Khojasteh-Band S, Zaboli M, Hassani Z, Mortezavi M, Mahani M, Torkzadeh-Mahani M. The effect of different percentages of triethanolammonium butyrate ionic liquid on the structure and activity of urate oxidase: Molecular docking, molecular dynamics simulation, and experimental study. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111318] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|
10
|
Tracing chirality, diameter dependence, and temperature-controlling of single-walled carbon nanotube non-covalent functionalization by biologically compatible peptide: insights from molecular dynamics simulations. J Mol Model 2019; 25:274. [PMID: 31451939 DOI: 10.1007/s00894-019-4154-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 08/14/2019] [Indexed: 10/26/2022]
Abstract
Biological applications of single-walled carbon nanotubes (SWCNTs), including drug delivery, require their functionalization with various functional groups such as peptides. Recently, a biologically compatible peptide (named PW3 with the sequence of NH2-Trp-Val-Trp-Val-Trp-Val-Lys-Lys-COOH) has been introduced as a good candidate for modification of carbon nanotubes due to its high affinity toward the exterior surface of these nano-carriers. In order to optimize the process of SWCNT peptide functionalization, the effects of chirality and diameter of SWCNTs as well as the temperature on PW3 adsorption were systematically investigated using molecular dynamics (MD) simulation. It was found that modification of chiral/zigzag SWCNT by PW3 peptide was more suitable compared with the armchair system due to the strong peptide-nanotube interactions and more water solubility at 310 K which can be well explained by microscopic structural investigations. Regarding the enhanced peptide-chiral nanotube interactions at the low temperature of 277 K, chiral nanotubes can be effective structures for SWCNT functionalization process at reduced temperatures. Our analysis indicated that disrupted PW3 and SWCNT hydration patterns and fewer internal interactions within the peptide could be responsible for the stronger peptide modification of SWCNT at higher temperatures. Additionally, "PW3/SWCNT" systems containing larger tube diameters formed more stable complexes owing to their effective surface area increment.
Collapse
|
11
|
Hashemzadeh H, Raissi H. The functionalization of carbon nanotubes to enhance the efficacy of the anticancer drug paclitaxel: a molecular dynamics simulation study. J Mol Model 2017; 23:222. [PMID: 28702805 DOI: 10.1007/s00894-017-3391-z] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2017] [Accepted: 06/22/2017] [Indexed: 12/20/2022]
Abstract
Carbon nanotubes (CNTs) are widely used in drug delivery systems (DDSs) due to their unique chemical and physical properties. Investigation of interactions between biomolecules and CNTs is an interesting and important subject in biological applications. In this study, we used molecular dynamics (MD) simulation to investigate the adsorption mechanism of the anticancer drug paclitaxel (PTX) on pristine and functionalized CNTs (f-CNT) in aqueous solutions. Our theoretical results show that PTX can be adsorbed on sidewalls of CNT in different methods. In the case of f-CNTs, PTX can be adsorbed on the functional groups due to the existence of polar interactions. These interactions in the CNT functionalized with polyethylene glycol (PEG), are more than the other investigated systems. Furthermore, it was found that the solubility of CNTs in aqueous solution is increased by functionalization. This is related to the intermolecular hydrogen bonds between functional groups and solvent molecules. The PEG group has the greatest effect on the solubility of the CNT in aqueous solution due to more polar interactions.
Collapse
Affiliation(s)
| | - Heidar Raissi
- Department of Chemistry, University of Birjand, Birjand, Iran
| |
Collapse
|
12
|
Cova TFGG, Nunes SCC, Pais AACC. Free-energy patterns in inclusion complexes: the relevance of non-included moieties in the stability constants. Phys Chem Chem Phys 2017; 19:5209-5221. [DOI: 10.1039/c6cp08081b] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A MD/PMF-based procedure is designed for quantification of the interaction and respective components, guiding complex formation in water between β-CD and several naphthalene derivatives, highlighting the relevance of substituents.
Collapse
Affiliation(s)
- Tânia F. G. G. Cova
- Coimbra Chemistry Centre
- Department of Chemistry
- University of Coimbra
- 3004-535 Coimbra
- Portugal
| | - Sandra C. C. Nunes
- Coimbra Chemistry Centre
- Department of Chemistry
- University of Coimbra
- 3004-535 Coimbra
- Portugal
| | - Alberto A. C. C. Pais
- Coimbra Chemistry Centre
- Department of Chemistry
- University of Coimbra
- 3004-535 Coimbra
- Portugal
| |
Collapse
|