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Yekymov E, Attia D, Levi-Kalisman Y, Bitton R, Yerushalmi-Rozen R. Effects of Non-Ionic Micelles on the Acid-Base Equilibria of a Weak Polyelectrolyte. Polymers (Basel) 2022; 14:1926. [PMID: 35567095 PMCID: PMC9100363 DOI: 10.3390/polym14091926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2022] [Revised: 04/28/2022] [Accepted: 05/03/2022] [Indexed: 02/01/2023] Open
Abstract
Weak polyelectrolytes (WPEs) are widely used as pH-responsive materials, pH modulators and charge regulators in biomedical and technological applications that involve multi-component fluid environments. In these complex fluids, coupling between (often weak) interactions induced by micelles, nanoparticles and molecular aggregates modify the pKa as compared to that measured in single component solutions. Here we investigated the effect of coupling between hydrogen bonding and excluded volume interactions on the titration curves and pKa of polyacrylic acid (PAA) in solutions comprising PEO-based micelles (Pluronics and Brij-S20) of different size and volume fraction. Titration experiments of dilute, salt-free solutions of PAA (5 kDa, 30 kDa and 100 kDa) at low degree of polymer ionization (α < 0.25) drive spatial re-organization of the system, reduce the degree of ionization and consequentially increase the pKa by up to ~0.7 units. These findings indicate that the actual degree of ionization of WPEs measured in complex fluids is significantly lower (at a given pH) than that measured in single-component solutions.
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Affiliation(s)
- Evgenee Yekymov
- Department of Chemical Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel; (E.Y.); (D.A.); (R.B.)
| | - David Attia
- Department of Chemical Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel; (E.Y.); (D.A.); (R.B.)
| | - Yael Levi-Kalisman
- The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel;
- The Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Ronit Bitton
- Department of Chemical Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel; (E.Y.); (D.A.); (R.B.)
- The Ilse Katz Institute for Nanoscience and Technology, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Rachel Yerushalmi-Rozen
- Department of Chemical Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel; (E.Y.); (D.A.); (R.B.)
- The Ilse Katz Institute for Nanoscience and Technology, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
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Serrano-Medina A, Oroz-Parra I, Gomez-Resendiz VE, Licea-Navarro A, Licea-Claverie A, Cornejo-Bravo JM. Temperature- and pH-sensitive core–shell nanogels as efficient carriers of doxorubicin with potential application in lung cancer treatment. INT J POLYM MATER PO 2017. [DOI: 10.1080/00914037.2017.1297938] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Aracely Serrano-Medina
- Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Tijuana, Baja California, México
- Facultad de Medicina y Psicología, Universidad Autónoma de Baja California, Tijuana, Baja California, México
| | - Irasema Oroz-Parra
- Departamento de Innovación Biomédica, Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Baja California, México
- Facultad de Ciencias Marinas, Universidad Autónoma de Baja California, Ensenada, Baja California, México
| | - Victor E. Gomez-Resendiz
- Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Tijuana, Baja California, México
| | - Alexei Licea-Navarro
- Departamento de Innovación Biomédica, Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Baja California, México
| | - Angel Licea-Claverie
- Centro de Graduados e Investigación en Química, Instituto Tecnológico de Tijuana, Tijuana, Baja California, México
| | - Jose M. Cornejo-Bravo
- Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Tijuana, Baja California, México
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Wang J, Zhang JL, Wu FA. Enrichment process for α-linolenic acid from silkworm pupae oil. EUR J LIPID SCI TECH 2013. [DOI: 10.1002/ejlt.201200324] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Jun Wang
- School of Biology and Chemical Engineering; Jiangsu University of Science and Technology; Zhenjiang; P.R. China
| | - Jin-Liang Zhang
- School of Biology and Chemical Engineering; Jiangsu University of Science and Technology; Zhenjiang; P.R. China
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Musial W, Voncina B, Pluta J, Kokol V. The study of release of chlorhexidine from preparations with modified thermosensitive poly-N-isopropylacrylamide microspheres. ScientificWorldJournal 2012; 2012:243707. [PMID: 22629123 PMCID: PMC3353284 DOI: 10.1100/2012/243707] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2011] [Accepted: 11/20/2011] [Indexed: 11/17/2022] Open
Abstract
The aim of this study was to investigate and compare the release rates of chlorhexidine (CX) base entrapped in the polymeric beads of modified poly-N-isopropylacrylamides (pNIPAMs) at temperatures below and over the volume phase transition temperature (VPTT) of synthesized polymers: pNIPAM-A with terminal anionic groups resulting from potassium persulfate initiator, pNIPAM-B with cationic amidine terminal groups, and pNIPAM-C comprising anionic terminals, but with increased hydrophobicity maintained by the N-tert-butyl functional groups. The preparations, assessed in vitro below the VPTT, release an initial burst of CX at different time periods between 120 and 240 min, followed by a period of 24 h, when the rate of release remains approximately constant, approaching the zero-order kinetics; the release rates for the polymers beads are as follows: pNIPAM-C>pNIPAM-B>pNIPAM-A. The pattern of release rates at temperature over the VPTT is as follows: pNIPAM-C>pNIPAM-A>pNIPAM-B. In the presence of pNIPAM-C, the duration between the start of the release and the attained minimal inhibitory concentration (MIC) for most of the microbes, in conditions over the VPTT, increased from 60 to 90 min. The release prolongation could be ascribed to some interactions between the practically insoluble CX particle and the hydrophobic functional groups of the polymer.
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Affiliation(s)
- Witold Musial
- Department of Pharmaceutical Technology, Wroclaw Medical University, ul Szewska 38, 50-139 Wrocław, Poland.
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Cornejo-Bravo JM, Vazquez-Altamirano JE, Rogel-Hernandez E, Licea-Claverie A, Ramos-Ibarra MA. Synthesis of hydrophobic weak-acid monomers by enzymatic action and their polymerization to obtain hydrophobic polyelectrolytes. Des Monomers Polym 2012. [DOI: 10.1163/156855507780949218] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Affiliation(s)
- J. M. Cornejo-Bravo
- a Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Calzada Tecnológico 14418, Mesa de Otay, C.P. 22300, Tijuana, B.C., México
| | - J. E. Vazquez-Altamirano
- b Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Calzada Tecnológico 14418, Mesa de Otay, C.P. 22300, Tijuana, B.C., México
| | - E. Rogel-Hernandez
- c Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Calzada Tecnológico 14418, Mesa de Otay, C.P. 22300, Tijuana, B.C., México
| | - A. Licea-Claverie
- d Centro de Graduados e Investigación del Instituto Tecnológico de Tijuana, A.P. 1166, C.P. 22000 Tijuana, B.C., México
| | - M. A. Ramos-Ibarra
- e Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, Calzada Tecnológico 14418, Mesa de Otay, C.P. 22300, Tijuana, B.C., México
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Muthusamy R, Kulkarni MG. pH Sensitive graft copolymers for zero order drug release: a mechanistic analysis. Drug Dev Ind Pharm 2011; 38:73-83. [PMID: 22118221 DOI: 10.3109/03639045.2011.590991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Aliphatic polyesters containing pendent unsaturation were synthesized by the polycondensation of a diol, dicarboxylic acid and glycidyl methacrylate. Grafting methacrylic acid (MAA) resulted in graft copolymers containing polyester backbone and MAA grafts. Depending on composition, the polymers swelled extensively and eroded or dissolved at near neutral pH but remained in collapsed state at acidic pH. Three representative drugs differing in solubility, viz., Diltiazem hydrochloride (DH), Indomethacin (IM) and Verapamil hydrochloride (VH) were released at constant rate from tablets made by compressing spray-dried microparticles. The release of DH at constant rate has been attributed to increase in diffusion coefficient of the drug from the swollen layer of matrix. The release of IM and VH at constant rate was governed by erosion and was enhanced in matrices which undergo dissolution. The release rate was enhanced with increasing MAA content and the frequency of grafts along the polyester backbone. Once a day dosage forms for drugs differing in solubility have been developed using a single polymer matrix which is easy to manufacture.
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Affiliation(s)
- Ramesh Muthusamy
- Polymer Science and Engineering Division, National Chemical Laboratory, Pune, India
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Cornejo-Bravo JM, Partida-Soria Y, Serrano-Medina A, Espinoza-Dueñas K, Ramos MA, Licea-Claverie A. Hydrophobic weak acid polymers as controlled release carriers. Pharm Dev Technol 2010; 17:170-6. [DOI: 10.3109/10837450.2010.529147] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Factors affecting release rate of diltiazem hydrochloride from poly (2-hydroxyethyl methacrylate) matrices. Colloids Surf B Biointerfaces 2008; 63:146-52. [DOI: 10.1016/j.colsurfb.2007.11.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2007] [Revised: 11/21/2007] [Accepted: 11/26/2007] [Indexed: 11/22/2022]
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Licea-Claveríe A, Cornejo-Bravo JM, Salgado-Rodríguez R, Santos-Rosas DDR, Lugo-Medina E, Ramos-Ibarra MA, Arndt KF. Temperature and pH-Sensitive Polymers with Hydrophobic Spacers for the Controlled Delivery of Drugs. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/masy.200750843] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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