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Hossain MAA, Islam T, Joy MTR, Kowser Z, Ahmed MZ, Rehman MT, AlAjmi MF, Mahbub S, Goni MA, Hoque MA, Kabir SE. Interaction between gastric enzyme pepsin and tetradecyltrimethylammonium bromide in presence of sodium electrolytes: Exploration of micellization behavior. Int J Biol Macromol 2023; 253:127478. [PMID: 37866567 DOI: 10.1016/j.ijbiomac.2023.127478] [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: 09/07/2023] [Revised: 10/13/2023] [Accepted: 10/15/2023] [Indexed: 10/24/2023]
Abstract
Pepsin is a proteolytic enzyme used in the treatment of digestive disorders. In this study, we investigated the physicochemical properties of the tetradecyltrimethylammonium bromide (TTAB) and pepsin protein mixture in various sodium salt media within a temperature range of 300.55-320.55 K with 5 K intervals. The conductometric study of the TTAB+pepsin mixture revealed a reduction in the critical micelle concentration (CMC) in electrolyte media. The micellization of TTAB was delayed in the presence of pepsin. The CMC of the TTAB + pepsin mixture was found to depend on the concentrations of electrolytes and protein, as well as the temperature variations. The aggregation of the TTAB+pepsin mixture was hindered as a function of [pepsin] and increasing temperatures, while micellization was promoted in aqueous electrolyte solutions. The negative free energy changes (∆Gm0) indicated the spontaneous aggregation of the TTAB+pepsin mixture. Changes in enthalpy, entropy, molar heat capacities, transfer properties, and enthalpy-entropy compensation variables were calculated and illustrated rationally. The interaction forces between TTAB and pepsin protein in the experimental solvents were primarily hydrophobic and electrostatic (ion-dipole) in nature. An analysis of molecular docking revealed hydrophobic interactions as the main stabilizing forces in the TTAB-pepsin complex.
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Affiliation(s)
- Md Al Amin Hossain
- Department of Chemistry, Jashore University of Science and Technology, Jashore 7408, Bangladesh
| | - Tamanna Islam
- Department of Chemistry, Jashore University of Science and Technology, Jashore 7408, Bangladesh
| | - Md Tuhinur R Joy
- Department of Chemistry, Jashore University of Science and Technology, Jashore 7408, Bangladesh.
| | - Zannatul Kowser
- Department of Chemistry, Jashore University of Science and Technology, Jashore 7408, Bangladesh
| | - Mohammad Z Ahmed
- Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia.
| | - Md Tabish Rehman
- Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
| | - Mohamed F AlAjmi
- Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
| | - Shamim Mahbub
- Nuclear Safety, Security & Safeguards Division, Bangladesh Atomic Energy Regulatory Authority, Agargaon, Dhaka 1207, Bangladesh
| | - Md Abdul Goni
- Department of Biological and Physical Sciences, South Carolina State University, Orangeburg, SC 29117, USA
| | - Md Anamul Hoque
- Department of Chemistry, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh
| | - Shariff E Kabir
- Department of Chemistry, Jagannath University, Dhaka 1100, Bangladesh
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Abdous B, Sajjadi SM, Bagheri A. Predicting the aggregation number of cationic surfactants based on ANN-QSAR modeling approaches: understanding the impact of molecular descriptors on aggregation numbers. RSC Adv 2022; 12:33666-33678. [PMID: 36505704 PMCID: PMC9685374 DOI: 10.1039/d2ra06064g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Accepted: 11/03/2022] [Indexed: 11/25/2022] Open
Abstract
In this work, a quantitative structure-activity relationship (QSAR) study is performed on some cationic surfactants to evaluate the relationship between the molecular structures of the compounds with their aggregation numbers (AGGNs) in aqueous solution at 25 °C. An artificial neural network (ANN) model is combined with the QSAR study to predict the aggregation number of the surfactants. In the ANN analysis, four out of more than 3000 molecular descriptors were used as input variables, and the complete set of 41 cationic surfactants was randomly divided into a training set of 29, a test set of 6, and a validation set of 6 molecules. After that, a multiple linear regression (MLR) analysis was utilized to build a linear model using the same descriptors and the results were compared statistically with those of the ANN analysis. The square of the correlation coefficient (R 2) and root mean square error (RMSE) of the ANN and MLR models (for the whole data set) were 0.9392, 7.84, and 0.5010, 22.52, respectively. The results of the comparison revealed the efficiency of ANN in detecting a correlation between the molecular structure of surfactants and their AGGN values with a high predictive power due to the non-linearity in the studied data. Based on the ANN algorithm, the relative importance of the selected descriptors was computed and arranged in the following descending order: H-047 > ESpm12x > JGI6> Mor20p. Then, the QSAR data was interpreted and the impact of each descriptor on the AGGNs of the molecules were thoroughly discussed. The results showed there is a correlation between each selected descriptor and the AGGN values of the surfactants.
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Affiliation(s)
- Behnaz Abdous
- Faculty of Chemistry, Semnan UniversitySemnanIran+98-23-33384110+98-23-31533192
| | - S. Maryam Sajjadi
- Faculty of Chemistry, Semnan UniversitySemnanIran+98-23-33384110+98-23-31533192
| | - Ahmad Bagheri
- Faculty of Chemistry, Semnan UniversitySemnanIran+98-23-33384110+98-23-31533192
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The Triple Mechanisms of Atenolol Adsorption on Ca-Montmorillonite: Implication in Pharmaceutical Wastewater Treatment. MATERIALS 2019; 12:ma12182858. [PMID: 31491854 PMCID: PMC6765981 DOI: 10.3390/ma12182858] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 09/02/2019] [Accepted: 09/02/2019] [Indexed: 11/17/2022]
Abstract
The adsorption of atenolol (AT) from aqueous solutions by Ca-montmorillonite (SAz-2) was investigated in batch studies under different physicochemical conditions. The AT existed in neutral un-dissociated form at pH 10, and was adsorbed on dioctahedral smectite (SAz-2) obeying the Langmuir isotherm with a maximum adsorption capacity of 330 mmol/kg. The kinetic adsorption suggested that both strong and weak adsorption sites existed on SAz-2 and participated in the adsorption mechanisms. The amount of exchangeable cations desorbed from SAz-2 during AT adsorption was linearly correlated with the amounts of adsorbed AT having slopes of 0.43, which implied that a cation exchange based adsorption mechanism was also in place. A comprehensive basal spacing change of SAz-2 was observed after AT adsorption on the clay mineral when tested with or without AT recrystallization. The intercalation of AT into the SAz-2 interlayers did not result in swelling due to the low adsorption capacity of the drug. Prominent interactions between the pharmaceutical molecule and SAz-2 were evidenced by apparent shifts of the infrared absorption bands after adsorption. The interlayer configurations and hydrogen bonding of AT on SAz-2 were also supported by infrared, X-ray diffraction and thermogravimetric analyses. This study suggested that SAz-2 is an excellent material to remove not only AT from pharmaceutical wastewater, but can potentially remove many other β-receptor blocker drugs. The results helped us to understand the possible interlayer configurations and adsorption mechanisms of the drugs on natural clay mineral based adsorbents.
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Cid A, Moldes OA, Mejuto JC, Simal-Gandara J. Interaction of Caffeic Acid with SDS Micellar Aggregates. Molecules 2019; 24:molecules24071204. [PMID: 30934775 PMCID: PMC6479452 DOI: 10.3390/molecules24071204] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 03/22/2019] [Accepted: 03/25/2019] [Indexed: 11/16/2022] Open
Abstract
Micellar systems consisting of a surfactant and an additive such as an organic salt or an acid usually self-organize as a series of worm-like micelles that ultimately form a micellar network. The nature of the additive influences micellar structure and properties such as aggregate lifetime. For ionic surfactants such as sodium dodecyl sulfate (SDS), CMC decreases with increasing temperature to a minimum in the low-temperature region beyond which it exhibits the opposite trend. The presence of additives in a surfactant micellar system also modifies monomer interactions in aggregates, thereby altering CMC and conductance. Because the standard deviation of β was always lower than 10%, its slight decrease with increasing temperature was not significant. However, the absolute value of Gibbs free enthalpy, a thermodynamic potential that can be used to calculate the maximum of reversible work, increased with increasing temperature and caffeic acid concentration. Micellization in the presence of caffeic acid was an endothermic process, which was entropically controlled. The enthalpy and enthropy positive values resulted from melting of "icebergs" or "flickering clusters" around the surfactant, leading to increased packing of hydrocarbon chains within the micellar core in a non-random manner. This can be possibly explained by caffeic acid governing the 3D matrix structure of water around the micellar aggregates. The fact that both enthalpy and entropy were positive testifies to the importance of hydrophobic interactions as a major driving force for micellization. Micellar systems allow the service life of some products to be extended without the need to increase the amounts of post-harvest storage preservatives used. If a surfactant is not an allowed ingredient or food additive, carefully washing it off before the product is consumed can avoid any associated risks. In this work, we examined the influence of temperature and SDS concentration on the properties of SDS⁻caffeic acid micellar systems. Micellar properties can be modified with various additives to develop new uses for micelles. This allows smaller amounts of additives to be used without detracting from their benefits.
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Affiliation(s)
- Antonio Cid
- Physical Chemistry Department, Faculty of Sciences, University of Vigo, 32004 Ourense, Spain.
- LAQV-UCIBIO, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnología, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal.
| | - Oscar A Moldes
- Physical Chemistry Department, Faculty of Sciences, University of Vigo, 32004 Ourense, Spain.
| | - Juan C Mejuto
- Physical Chemistry Department, Faculty of Sciences, University of Vigo, 32004 Ourense, Spain.
| | - Jesus Simal-Gandara
- Nutrition and Bromatology Group, Department of Analytical and Food Chemistry, Faculty of Food Science and Technology, University of Vigo, Ourense Campus, 32004 Ourense, Spain.
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Zuriaga E, Lomba L, Royo FM, Lafuente C, Giner B. Aggregation behaviour of betablocker drugs in aqueous media. NEW J CHEM 2014. [DOI: 10.1039/c4nj00112e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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6
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Cid A, Morales J, Mejuto J, Briz-Cid N, Rial-Otero R, Simal-Gándara J. Thermodynamics of sodium dodecyl sulphate-salicylic acid based micellar systems and their potential use in fruits postharvest. Food Chem 2014; 151:358-63. [DOI: 10.1016/j.foodchem.2013.11.076] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2013] [Revised: 09/27/2013] [Accepted: 11/13/2013] [Indexed: 11/29/2022]
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7
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Grinberg VY, Burova TV, Grinberg NV, Dubovik AS, Concheiro A, Alvarez-Lorenzo C. Binding affinity of thermoresponsive polyelectrolyte hydrogels for charged amphiphilic ligands. A DSC approach. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:4165-4171. [PMID: 24655346 DOI: 10.1021/la5005984] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Controlled drug binding and release stand among top requirements postulated for targeted drug delivery systems of the new generations. "Smart" polymers and gels are highly suitable for the controlled delivery due to their structural sensitivity to minor environmental variations. The aim of this work was to study thermoresponsive polyanionic and polycationic hydrogels of N-isopropylacrylamide copolymers with acrylic acid and N-aminopropylmethacrylamide in terms of their interaction with two widely used drugs, propranolol and ibuprofen. Binding energetics of these drugs by the gels in swollen and collapsed state was estimated by means of high-sensitivity differential scanning calorimetry. Thermodynamic parameters of the gel collapse (transition temperature, enthalpy, heat capacity increment, and width) were determined as a dependence of the drug concentrations. From these data the excess free energy of collapse was calculated as a function of drug concentration. Deconvolution of this function resulted in the evaluation of binding parameters and contributions from interactions of various types to the free energy of binding. The binding mechanism of both drugs to the swollen and collapsed gels was elucidated. Its main features are the cooperative character of the drug binding by the collapsed gel and the predominant role of the hydrophobicity of drugs in their affinity for the swollen gel.
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Affiliation(s)
- Valerij Y Grinberg
- N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences , Kosygin St. 4, 119334 Moscow, Russia
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8
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Effects of ascorbic acid on the microstructure and properties of SDS micellar aggregates for potential food applications. Food Res Int 2013. [DOI: 10.1016/j.foodres.2012.10.009] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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9
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Hassan N, Maldonado-Valderrama J, Gunning AP, Morris VJ, Ruso JM. Investigating the effect of an arterial hypertension drug on the structural properties of plasma protein. Colloids Surf B Biointerfaces 2011; 87:489-97. [PMID: 21726985 DOI: 10.1016/j.colsurfb.2011.06.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2011] [Revised: 05/02/2011] [Accepted: 06/09/2011] [Indexed: 11/26/2022]
Abstract
Propanolol is a betablocker drug used in the treatment of arterial hypertension related diseases. In order to achieve an optimal performance of this drug it is important to consider the possible interactions of propanolol with plasma proteins. In this work, we have used several experimental techniques to characterise the effect of addition of the betablocker propanolol on the properties of bovine plasma fibrinogen (FB). Differential scanning calorimeter (DSC), circular dichroism (CD), dynamic light scattering (DLS), surface tension techniques and atomic force microscopy (AFM) measurements have been combined to carry out a detailed physicochemical and surface characterization of the mixed system. As a result, DSC measurements show that propranolol can play two opposite roles, either acting as a structure stabilizer at low molar concentrations or as a structure destabilizer at higher concentrations, in different domains of fibrinogen. CD measurements have revealed that the effect of propanolol on the secondary structure of fibrinogen depends on the temperature and the drug concentration and the DLS analysis showed evidence for protein aggregation. Interestingly, surface tension measurements provided further evidence of the conformational change induced by propanolol on the secondary structure of FB by importantly increasing the surface tension of the system. Finally, AFM imaging of the fibrinogen system provided direct visualization of the protein structure in the presence of propanolol. Combination of these techniques has produced complementary information on the behavior of the mixed system, providing new insights into the structural properties of proteins with potential medical interest.
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Affiliation(s)
- Natalia Hassan
- Department of Applied Physics University of Santiago de Compostela, Santiago de Compostela, Spain
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10
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Costa-Balogh FO, Sparr E, Sousa JJS, Pais AC. Drug release from lipid liquid crystalline phases: relation with phase behavior. Drug Dev Ind Pharm 2010; 36:470-81. [DOI: 10.3109/03639040903261997] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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11
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Ramil M, El Aref T, Fink G, Scheurer M, Ternes TA. Fate of beta blockers in aquatic-sediment systems: sorption and biotransformation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2010; 44:962-970. [PMID: 20030338 DOI: 10.1021/es9027452] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The fate of beta blockers (atenolol, acebutolol, bisoprolol, celiprolol, metoprolol, nadolol, pindolol, propranolol, and sotalol) was studied in surface water-sediment systems. A new analytical method was developed to determine the beta blockers in sediments by LC-ESI-tandem MS detection. The relative recoveries in sediments ranged from 89 +/- 7% (acebutolol) to 102 +/- 3% (nadolol) using deuterated surrogate standards. Beta blockers were present with concentrations up to 86 ng/g (bisoprolol) in the sediments of small German streams containing an elevated percentage of treated wastewater. Biotransformation studies and sorption isotherms of the beta blockers were performed with two natural river sediments ("Burgen", "Dausenau") differing in organic carbon content and particle size distribution. Biotransformation of beta blockers in the surface water-sediment systems exhibited a low to high persistence with 90% disappearance (DT(90)) ranging from 0.4-10 d (pindolol, atenolol) to >100 d (sotalol, propranolol or celiprolol). For sorption studies neither NaN(3) addition nor autoclavation led to a complete mass balance of the beta blockers, probably due to biotransformation. Isotherms at 6 h (apparent equilibrium, measuring aqueous and sediment phase) fitted by the Freundlich equation show that sorption of all beta blockers to the Burgen sediment were linear or close to it (i.e., n-values between 0.93 and 1.13), while in the Dausenau sediment the sorptions were slightly non linear (i.e., n-values 0.77-0.91). In river water the sorbed fraction is negligible in comparison to the dissolved fraction. Nevertheless, beta blockers can be detected with concentrations up to 86 ng/g (bisoprolol) in sediments of small streams containing more than 50% treated wastewater.
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Affiliation(s)
- Maria Ramil
- Federal Institute of Hydrology, D-56068 Koblenz, Am Mainzer Tor 1, Germany
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12
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Ikonen M, Murtomäki L, Kontturi K. Studying the interactions of drugs and hydrophobic model membranes using contact angle goniometry. Colloids Surf B Biointerfaces 2009; 71:107-12. [DOI: 10.1016/j.colsurfb.2009.01.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2008] [Revised: 12/16/2008] [Accepted: 01/13/2009] [Indexed: 10/21/2022]
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Fountoulakis MS, Stamatelatou K, Lyberatos G. The effect of pharmaceuticals on the kinetics of methanogenesis and acetogenesis. BIORESOURCE TECHNOLOGY 2008; 99:7083-7090. [PMID: 18280143 DOI: 10.1016/j.biortech.2008.01.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2007] [Revised: 12/28/2007] [Accepted: 01/04/2008] [Indexed: 05/25/2023]
Abstract
In this study, the widely used anaerobic digestion model (ADM1) was used in order to simulate the inhibition of three pharmaceuticals, propranolol hydrochloride, ofloxacin and diclofenac sodium, on two groups of microorganisms, acetogens and acetoclastic methanogens, the most sensitive microorganisms groups involved in the anaerobic digestion process. The specific maximum consumption rate and saturation constant of acetate and propionate degraders were estimated through fitting the model to experimental data taken from continuous and batch experiments. A modified non-competitive inhibition function was used, and the inhibition constants were estimated using data from Batch experiments conducted at various concentrations of pharmaceuticals using enriched cultures with propionate and acetate degraders. It was found that propranolol hydrochloride was the most inhibitory pharmaceutical to both microorganisms groups.
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Affiliation(s)
- M S Fountoulakis
- Laboratory of Biochemical Engineering and Environmental Technology, Department of Chemical Engineering, University of Patras, University Campus, Rio, GR-26500 Patras, Greece.
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Kibbey TCG, Paruchuri R, Sabatini DA, Chen L. Adsorption of beta blockers to environmental surfaces. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2007; 41:5349-56. [PMID: 17822101 DOI: 10.1021/es070152v] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Beta-adrenergic blocking agents (beta blockers) are widely used pharmaceuticals which have been detected in the environment. Predicting the transport and ultimate fate of beta blockers in the environment requires understanding their adsorption to soils and sediments, something for which little information is currently available. The objective of this work was to examine the adsorption of three beta blockers, propranolol, metoprolol and nadolol, to a natural alluvial material, as well as to six minerals present as components of the alluvial material. Batch adsorption experiments indicate that, for most of the minerals studied, compound hydrophobicity is an important predictor of adsorption, with propranolol,the most hydrophobic compound studied, adsorbing to the greatest extent. Results further suggest that, for the minerals studied, electrostatic effects are not a good predictor of adsorption; adsorption extent was not well-predicted by either surface zeta potential or by the difference between experiment pH and point of zero charge, despite the cationic nature af the three beta blockers at experiment pH values. Experiments were conducted to examine the effect of an anionic surfactant, sodium dodecyl benzene sulfonate (SDBS), on adsorption. Results indicate that SDBS significantly increases the adsorption of propranolol to two different sorbents. This result is potentially important because surfactants such as SDBS are likely to be present in wastewater effluents with beta blockers and could influence their mobility in the environment.
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Affiliation(s)
- Tohren C G Kibbey
- School of Civil Engineering and Environmental Science, The University of Oklahoma, Norman, Oklahoma 73019-1024, USA.
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15
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Martı́nez-Landeira P, González-Pérez A, Ruso JM, Prieto G, Sarmiento F. Colloidal properties of benzylpenicillin. Colloids Surf A Physicochem Eng Asp 2004. [DOI: 10.1016/j.colsurfa.2004.01.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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16
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A volumetric study of two related amphiphilic beta-blockers as a function of temperature and electrolyte concentration. Colloids Surf B Biointerfaces 2004. [DOI: 10.1016/j.colsurfb.2003.10.002] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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17
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Self-assembling characteristics of 5-(α-acetamido-α-benzyl) methyl-5′-methyl imidazolidine-2,4-dione – A hydantoin drug. Chem Phys 2003. [DOI: 10.1016/s0301-0104(03)00176-9] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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18
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Ruso JM, López-Fontán JL, Prieto G, Sarmiento F. The self-association of acebutolol: Conductometry and light scattering. J Chem Phys 2003. [DOI: 10.1063/1.1556845] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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19
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Surface properties of some amphiphilic antidepressant drugs in different aqueous media. Colloid Polym Sci 2003. [DOI: 10.1007/s00396-002-0817-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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20
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MARTÍNEZ-LANDEIRA PABLO, BESADA LINA, SEOANE LAURA, RUSO JUANM, PRIETO GERARDO, SARMIENTO FÉLIX. Thermodynamics of micellization of C7and C8lecithins. Mol Phys 2002. [DOI: 10.1080/00268970210127942] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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21
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Chevalier Y. New surfactants: new chemical functions and molecular architectures. Curr Opin Colloid Interface Sci 2002. [DOI: 10.1016/s1359-0294(02)00006-7] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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22
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BESADA LINA, MARTINEZ-LANDEIRA PABLO, SEOANE LAURA, PRIETO GERARDO, SARMIENTO FELIX, RUSO JUANM. A study of the behaviour of ampicillin in aqueous solution and thermodynamic characterization of its aggregation. Mol Phys 2001. [DOI: 10.1080/00268970110089126] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Varela LM, Garcia M, Perez-Rodriguez M, Taboada P, Ruso JM, Mosquera V. Multilayer adsorption model for the protein–ligand interaction. J Chem Phys 2001. [DOI: 10.1063/1.1362291] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Taboada P, Attwood D, García M, Jones MN, Ruso JM, Mosquera V, Sarmiento F. Thermodynamics of Association of Structurally Related Amphiphilic Penicillins. J Colloid Interface Sci 2000; 221:242-245. [PMID: 10631026 DOI: 10.1006/jcis.1999.6586] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Critical micelle concentrations (CMCs) of the penicillins cloxacillin and dicloxacillin in water were determined by conductivity measurements over the temperature range 288.15 to 313.15 K. Both penicillins showed minimum CMCs at temperatures close to 298.15 K. Thermodynamic parameters of aggregate formation were derived from the variation of the CMC with temperature using a modified form of the mass action model applicable to systems of low aggregation number. Values for the enthalpy of aggregate formation, DeltaH(0)(m), calculated by this method showed that the aggregation of both cloxacillin and dicloxacillin became increasingly exothermic with increase in temperature. The predicted DeltaH(0)(m) at 298.15 K was in good agreement with the value determined experimentally by calorimetry for each drug. Copyright 2000 Academic Press.
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Affiliation(s)
- P Taboada
- Grupo de Física de Coloides y Polímeros, Departamento de Física Aplicada y Departamento de Física de la Materia Condensada, Facultad de Física, Universidad de Santiago de Compostela, Santiago de Compostela, E-15706, Spain
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Taboada P, Attwood D, Ruso JM, García M, Sarmiento F, Mosquera V. Effect of Electrolyte on the Surface and Thermodynamic Properties of Amphiphilic Penicillins. J Colloid Interface Sci 1999; 220:288-292. [PMID: 10607445 DOI: 10.1006/jcis.1999.6545] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Critical micelle concentrations and surface properties of the penicillins cloxacillin, dicloxacillin, and nafcillin in aqueous solution at 303 K and at electrolyte concentrations over the range 0.0-0.4 mol dm(-3) were determined by surface tension measurements. A mass action model, modified for application to associating systems of low aggregation number, was used to calculate the standard Gibbs energy of micellization of these drugs at each electrolyte concentration. Copyright 1999 Academic Press.
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Affiliation(s)
- P Taboada
- Departamentos de Física Aplicada y Física de la Materia Condensada, Universidad de Santiago de Compostela, Spain
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Ruso JM, Attwood D, Rey C, Taboada P, Mosquera V, Sarmiento F. Light Scattering and NMR Studies of the Self-Association of the Amphiphilic Molecule Propranolol Hydrochloride in Aqueous Electrolyte Solutions. J Phys Chem B 1999. [DOI: 10.1021/jp983900z] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Juan M. Ruso
- Grupo de Física de Coloides y Polímeros and Departamento de Física de la Materia Condensada, Facultad de Física, Universidad de Santiago de Compostela, Spain, and School of Pharmacy and Pharmaceutical Sciences, University of Manchester, Manchester M13 9PL, U.K
| | - David Attwood
- Grupo de Física de Coloides y Polímeros and Departamento de Física de la Materia Condensada, Facultad de Física, Universidad de Santiago de Compostela, Spain, and School of Pharmacy and Pharmaceutical Sciences, University of Manchester, Manchester M13 9PL, U.K
| | - Carlos Rey
- Grupo de Física de Coloides y Polímeros and Departamento de Física de la Materia Condensada, Facultad de Física, Universidad de Santiago de Compostela, Spain, and School of Pharmacy and Pharmaceutical Sciences, University of Manchester, Manchester M13 9PL, U.K
| | - Pablo Taboada
- Grupo de Física de Coloides y Polímeros and Departamento de Física de la Materia Condensada, Facultad de Física, Universidad de Santiago de Compostela, Spain, and School of Pharmacy and Pharmaceutical Sciences, University of Manchester, Manchester M13 9PL, U.K
| | - Víctor Mosquera
- Grupo de Física de Coloides y Polímeros and Departamento de Física de la Materia Condensada, Facultad de Física, Universidad de Santiago de Compostela, Spain, and School of Pharmacy and Pharmaceutical Sciences, University of Manchester, Manchester M13 9PL, U.K
| | - Félix Sarmiento
- Grupo de Física de Coloides y Polímeros and Departamento de Física de la Materia Condensada, Facultad de Física, Universidad de Santiago de Compostela, Spain, and School of Pharmacy and Pharmaceutical Sciences, University of Manchester, Manchester M13 9PL, U.K
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