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Hernandez-Patlan D, Solis-Cruz B, Latorre JD, Maguey-Gonzalez JA, Castellanos-Huerta I, Beyssac E, Garrait G, Vázquez-Durán A, López-Arellano R, Méndez-Albores A, Hargis BM, Tellez-Isaias G. Evaluation of the Antimicrobial Activity of a Formulation Containing Ascorbic Acid and Eudragit FS 30D Microparticles for the Controlled Release of a Curcumin-Boric Acid Solid Dispersion in Turkey Poults Infected with Salmonella enteritidis: A Therapeutic Model. Int J Mol Sci 2023; 24:16186. [PMID: 38003375 PMCID: PMC10671343 DOI: 10.3390/ijms242216186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 11/06/2023] [Accepted: 11/08/2023] [Indexed: 11/26/2023] Open
Abstract
The selection of components within a formulation or for treatment must stop being arbitrary and must be focused on scientific evidence that supports the inclusion of each one. Therefore, the objective of the present study was to obtain a formulation based on ascorbic acid (AA) and Eudragit FS 30D microparticles containing curcumin-boric acid (CUR-BA) considering interaction studies between the active components carried out via Fourier transform infrared spectrometry (FTIR) and differential scanning calorimetry (DSC) to minimize antagonistic effects, and comprehensively and effectively treat turkey poults infected with Salmonella enteritidis (S. enteritidis). The DSC and FTIR studies clearly demonstrated the interactions between AA, BA, and CUR. Consequently, the combination of AA with CUR and/or BA should be avoided, but not CUR and BA. Furthermore, the Eudragit FS 30D microparticles containing CUR-BA (SD CUR-BA MP) showed a limited release of CUR-BA in an acidic medium, but they were released at a pH 6.8-7.0, which reduced the interactions between CUR-BA and AA. Finally, in the S. enteritidis infection model, turkey poults treated with the combination of AA and SD CUR-BA MP presented lower counts of S. enteritidis in cecal tonsils after 10 days of treatment. These results pointed out that the use of an adequate combination of AA and CUR-BA as an integral treatment of S. enteritidis infections could be a viable option to replace the indiscriminate use of antibiotics.
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Affiliation(s)
- Daniel Hernandez-Patlan
- Laboratory 5: LEDEFAR, Multidisciplinary Research Unit, Superior Studies Faculty at Cuautitlan (FESC), National Autonomous University of Mexico (UNAM), Cuautitlan Izcalli 54714, Mexico;
- Nanotechnology Engineering Division, Polytechnic University of the Valley of Mexico, Tultitlan 54910, Mexico
| | - Bruno Solis-Cruz
- Laboratory 5: LEDEFAR, Multidisciplinary Research Unit, Superior Studies Faculty at Cuautitlan (FESC), National Autonomous University of Mexico (UNAM), Cuautitlan Izcalli 54714, Mexico;
- Nanotechnology Engineering Division, Polytechnic University of the Valley of Mexico, Tultitlan 54910, Mexico
| | - Juan D. Latorre
- Division of Agriculture, Department of Poultry Science, University of Arkansas, Fayetteville, AR 72701, USA; (J.D.L.); (J.A.M.-G.); (I.C.-H.); (B.M.H.); (G.T.-I.)
| | - Jesus A. Maguey-Gonzalez
- Division of Agriculture, Department of Poultry Science, University of Arkansas, Fayetteville, AR 72701, USA; (J.D.L.); (J.A.M.-G.); (I.C.-H.); (B.M.H.); (G.T.-I.)
| | - Inkar Castellanos-Huerta
- Division of Agriculture, Department of Poultry Science, University of Arkansas, Fayetteville, AR 72701, USA; (J.D.L.); (J.A.M.-G.); (I.C.-H.); (B.M.H.); (G.T.-I.)
| | - Eric Beyssac
- UFR Pharmacie, UMR MEDIS, Université Clermont-Auvergne, F-63001 Clermont-Ferrand, France; (E.B.); (G.G.)
| | - Ghislain Garrait
- UFR Pharmacie, UMR MEDIS, Université Clermont-Auvergne, F-63001 Clermont-Ferrand, France; (E.B.); (G.G.)
| | - Alma Vázquez-Durán
- Unidad de Investigación Multidisciplinaria L14 (Alimentos, Micotoxinas y Micotoxicosis), Facultad de Estudios Superiores Cuautitlán, Universidad Nacional Autónoma de México, Cuautitlán Izcalli 54714, Mexico; (A.V.-D.); (A.M.-A.)
| | - Raquel López-Arellano
- Laboratory 5: LEDEFAR, Multidisciplinary Research Unit, Superior Studies Faculty at Cuautitlan (FESC), National Autonomous University of Mexico (UNAM), Cuautitlan Izcalli 54714, Mexico;
| | - Abraham Méndez-Albores
- Unidad de Investigación Multidisciplinaria L14 (Alimentos, Micotoxinas y Micotoxicosis), Facultad de Estudios Superiores Cuautitlán, Universidad Nacional Autónoma de México, Cuautitlán Izcalli 54714, Mexico; (A.V.-D.); (A.M.-A.)
| | - Billy M. Hargis
- Division of Agriculture, Department of Poultry Science, University of Arkansas, Fayetteville, AR 72701, USA; (J.D.L.); (J.A.M.-G.); (I.C.-H.); (B.M.H.); (G.T.-I.)
| | - Guillermo Tellez-Isaias
- Division of Agriculture, Department of Poultry Science, University of Arkansas, Fayetteville, AR 72701, USA; (J.D.L.); (J.A.M.-G.); (I.C.-H.); (B.M.H.); (G.T.-I.)
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Bazybek N, Wei Y, Ma G. Advances in encapsulating gonadotropin-releasing hormone agonists for controlled release: a review. J Microencapsul 2022; 39:452-466. [PMID: 35876729 DOI: 10.1080/02652048.2022.2100934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Gonadotropin-releasing hormone (GnRH) agonists are peptides consisting of nine or ten amino acid residues. GnRH agonists have been applied in the therapy of sexual hormone disorders like prostate cancer, endometriosis, uterine myoma, central precious puberty, and in-vitro fertility. Treatment is achieved by continuous hormone intake and long-term agonists administration, which is usually associated with poor patient compliance. Because GnRH agonists that are administered with the parenteral route are broken down by peptidase, their half-life is short. As a result, developing sustained release for the drug delivery system is significant. Even though some drugs have been successfully delivered with long-acting release microspheres and approved by the Food and Drug Administration (FDA), some challenges remain. This review highlighted current approaches to encapsulate GnRH agonists into delivery systems and strategies encountered during the loading process. Moreover, the following sections provide strategies to improve the release profile, and animal and human studies were summarised.
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Affiliation(s)
- Nardana Bazybek
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Yi Wei
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Guanghui Ma
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China.,University of Chinese Academy of Sciences, Beijing, China
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Ghiarasim R, Tiron CE, Tiron A, Dimofte MG, Pinteala M, Rotaru A. Solid-Phase Synthesized Copolymers for the Assembly of pH-Sensitive Micelles Suitable for Drug Delivery Applications. Nanomaterials (Basel) 2022; 12:1798. [PMID: 35683654 DOI: 10.3390/nano12111798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 05/11/2022] [Accepted: 05/18/2022] [Indexed: 12/04/2022]
Abstract
Diblock copolymers of polyhistidine are known for their self-assembly into micelles and their pH-dependent disassembly due to the amphiphilic character of the copolymer and the unsaturated imidazole groups that undergo a hydrophobic-to-hydrophilic transition in an acidic pH. This property has been largely utilized for the design of drug delivery systems that target a tumor environment possessing a slightly lower extracellular pH (6.8–7.2). The main purpose of this study was to investigate the possibility of designed poly(ethylene glycol)-polyhistidine sequences synthesized using solid-phase peptide synthesis (SPPS), to self-assemble into micelles, to assess the ability of the corresponding micelles to be loaded with doxorubicin (DOX), and to investigate the drug release profile at pH values similar to a malignant extracellular environment. The designed and assembled free and DOX-loaded micelles were characterized from a physico-chemical point of view, their cytotoxicity was evaluated on a human breast cancer cell line (MDA-MB-231), while the cellular areas where micelles disassembled and released DOX were assessed using immunofluorescence. We concluded that the utilization of SPPS for the synthesis of the polyhistidine diblock copolymers yielded sequences that behaved similarly to the copolymeric sequences synthesized using ring-opening polymerization, while the advantages of SPPS may offer facile tuning of the histidine site or the attachment of a large variety of functional molecules.
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Hanif M, Ameer N, Shehzad MA, Azeem M, Rana HL, Usman M. Improved anti-inflammatory effect of curcumin by designing self-emulsifying drug delivery system. Drug Dev Ind Pharm 2021; 47:1432-1438. [PMID: 34779318 DOI: 10.1080/03639045.2021.2001486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Purpose of present study was to prepare and evaluate self-emulsifying drug delivery system (SEDDS) of curcumin (Cur) to enhance its solubility and percentage release for the evaluation of anti-inflammatory effect. Curcumin loaded SEDDS formulation was prepared, and zones of self-emulsification were recognized by dilution method for the construction of phase diagram. Lauroglycol FCC, Tween 80 (surfactant), and Transcutol HP (co-surfactant) were selected based on their solubility and highest emulsion region in phase diagram. Thermodynamic stability of Cur-SEDDS was calculated through globule size, zeta potential, polydispersity index (PDI), viscosity and pH. Cur-SEDDS were also characterized by encapsulation efficiency (EE %), FT-IR, in vitro release, and in vivo anti-inflammatory effect. Results revealed that droplet size of Cur-SEDDS was 19.77 ± 0.03 nm with their PDI 0.22 ± 0.19, zeta potential -19.33 ± 0.94 and viscosity 25.68 ± 0.86 cp. EE % of Cur-SEDDS was found to be 94.99 ± 0.38%, percentage release 65.83% compared with pure curcumin powder. The designed formulation possesses significant anti-inflammatory activity in paw edema when compared with positive control in carrageenan induced rat paw edema assay. Newly developed Cur-SEDDS with enhanced curcumin solubility, percentage release and better anti-inflammatory action may be an alternative source of oral delivery of curcumin.
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Affiliation(s)
- Muhammad Hanif
- Department of Pharmaceutics Faculty of Pharmacy Bahauddin Zakariya University Multan
| | - Nabeela Ameer
- Department of Pharmaceutics Faculty of Pharmacy Bahauddin Zakariya University Multan
| | | | - Muhammad Azeem
- Department of Pharmaceutics Faculty of Pharmacy Bahauddin Zakariya University Multan
| | - Hafsa Latif Rana
- Department of Pharmaceutics Faculty of Pharmacy Bahauddin Zakariya University Multan
| | - Muhammad Usman
- Department of Pharmaceutics Faculty of Pharmacy Bahauddin Zakariya University Multan
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Goscianska J, Ejsmont A, Kubiak A, Ludowicz D, Stasiłowicz A, Cielecka-Piontek J. Amine-Grafted Mesoporous Carbons as Benzocaine-Delivery Platforms. Materials (Basel) 2021; 14:2188. [PMID: 33923274 DOI: 10.3390/ma14092188] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 04/14/2021] [Accepted: 04/22/2021] [Indexed: 12/12/2022]
Abstract
Smart porous carriers with defined structure and physicochemical properties are required for releasing the therapeutic drug with precise control of delivery time and location in the body. Due to their non-toxicity, ordered structure, and chemical and thermal stability, mesoporous carbons can be considered modern carriers for active pharmaceutical ingredients whose effectiveness needs frequent dosing algorithms. Here, the novel benzocaine delivery systems based on ordered mesoporous carbons of the cubic structure were obtained with the use of a hard template method and functionalization with amine groups at 40 °C for 8 h. It has been shown that amine grafting strongly modifies the surface chemistry and textural parameters of carbons. All samples indicated good sorption ability towards benzocaine, with evident improvement following the functionalization with the amine groups. The sorption capacity and drug release kinetics were strongly affected by the porosity of carbon carriers and the surface functional groups. The smallest amount of benzocaine (~12%) was released from pristine mesoporous carbon, which could be correlated with strong API–carrier interactions. Faster and more efficient release of the drug was observed in the case of triethylenetetramine modified carbon (~62%). All benzocaine delivery platforms based on amine-grafted mesoporous carbons revealed high permeability through the artificial membrane.
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Duffy C, O'Riordan D, O'Sullivan M, Jacquier JC. In vitro evaluation of chitosan copper chelate gels as a multimicronutrient feed additive for cattle. J Sci Food Agric 2018; 98:4177-4183. [PMID: 29418003 DOI: 10.1002/jsfa.8939] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Revised: 01/26/2018] [Accepted: 01/30/2018] [Indexed: 06/08/2023]
Abstract
BACKGROUND Effective micronutrient supplementation strategies are critical to ensure optimal health and productivity in livestock. The objective of this study was to develop a copper and vitamin (multimicronutrient) delivery system based on chitosan gel beads, and test its suitability, in vitro, for use as a cattle feed additive. RESULTS Chitosan was chelated with copper sulfate to produce millimetre-scale gel matrices (∼2 mm). The copper content was significantly increased (from 61 to 95 mg g by adjusting pH to alkaline conditions post bead formation. The beads could subsequently be loaded with the model vitamin riboflavin to levels as high as 324 µg g-1 beads. Restricted rehydration of the dried gel matrices in simulated rumen fluid led to a sustained release of riboflavin with no copper released in these neutral conditions for up to 24 h, demonstrating copper rumen bypass. Moreover, sustained release of the mineral was observed in abomasal conditions of pH 2 over a 3 h period. CONCLUSIONS The matrices showed rumen bypass for copper yet supplied nutritionally relevant levels of the free mineral in abomasal conditions, as required for effective supplementation in cattle. The controlled-release properties demonstrated by the matrices indicate their potential as a multimicronutrient functional feed additive to enhance cattle nutrition and productivity. © 2018 Society of Chemical Industry.
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Affiliation(s)
- Ciara Duffy
- Food for Health Ireland, UCD Institute of Food and Health, University College Dublin, Belfield, Dublin 4, Ireland
| | - Dolores O'Riordan
- Food for Health Ireland, UCD Institute of Food and Health, University College Dublin, Belfield, Dublin 4, Ireland
| | - Michael O'Sullivan
- Food for Health Ireland, UCD Institute of Food and Health, University College Dublin, Belfield, Dublin 4, Ireland
| | - Jean-Christophe Jacquier
- Food for Health Ireland, UCD Institute of Food and Health, University College Dublin, Belfield, Dublin 4, Ireland
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Abstract
OBJECTIVE In the present work nanocrystal-based formulation of risperidone (RIS) was proposed to overcome solubility issue of RIS, while lyophilization technique was used effectively, for conversion of RIS nanosuspension to solid state. SIGNIFICANCE RIS nanosuspension was developed and stabilized with a combination of polycaprolactone and Pluronic® F-68 as stabilizers. With focus on critical parameters like nature of cryoprotectants and effect of eutectic temperature on properties of nanosuspension, the suitability of lyophilization technique in improving the physical stability of prepared nanosuspension was also evaluated. Additionally, the developed nanocrystals were also assessed for their solid states properties. METHODS Various process parameters affecting average particle size and polydispersity index (PDI), viz. drug to surfactant ratio, solvent to anti-solvent ratio, stirring speed, type of stabilizer were optimized. Assessment of lyophilization as a suitable solidification technique (for conversion to powder form) was done with selective cryoprotectants (trehalose dihydrate and sorbitol). RESULTS The formulation was found to be stable at 4 °C for 3 months with size, PDI and zeta potential of 214 ± 3.4 nm, 0.120, and -10.2 ± 0.90 mV, respectively. Release profile of developed nanosuspension showed cumulative % release of ∼90% in initial 10 h whereas the value for the unprocessed drug was ∼11% in same time frame. CONCLUSIONS These findings suggest that developed formulation was able to enhance water solubility of the drug effectively and can be potentially used in the management of psychotic disorders.
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Affiliation(s)
- Dharmesh Gol
- a National Institute of Pharmaceutical Education and Research (NIPER) , Ahmedabad , India
| | - Shreya Thakkar
- a National Institute of Pharmaceutical Education and Research (NIPER) , Ahmedabad , India
| | - Manju Misra
- a National Institute of Pharmaceutical Education and Research (NIPER) , Ahmedabad , India
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Moreno M, Pow PY, Tabitha TST, Nirmal S, Larsson A, Radhakrishnan K, Nirmal J, Quah ST, Geifman Shochat S, Agrawal R, Venkatraman S. Modulating release of ranibizumab and aflibercept from thiolated chitosan-based hydrogels for potential treatment of ocular neovascularization. Expert Opin Drug Deliv 2017. [PMID: 28643528 DOI: 10.1080/17425247.2017.1343297] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
BACKGROUND This paper describes the synthesis of thiolated chitosan-based hydrogels with varying degrees of crosslinking that has been utilized to modulate release kinetics of two clinically relevant FDA-approved anti-VEGF protein drugs, ranibizumab and aflibercept. These hydrogels have been fabricated into disc shaped structures for potential use as patches on ocular surface. METHODS Protein conformational changes and aggregation after loading and release was evaluated by circular dichroism (CD), steady-state tryptophan fluorescence spectroscopy, electrophoresis and size-exclusion chromatography (SEC). Finally, the capacity of both released proteins to bind to VEGF was tested by ELISA and surface plasmon resonance (SPR) technology. RESULTS The study demonstrates the versatility of thiolated chitosan-based hydrogels for delivering proteins. The effect of various parameters of the hydrogel on protein release kinetics and mechanism of protein release was studied using the Korsmeyer-Peppas release model. Furthermore, we have studied the stability of released proteins in detail while comparing it with non-entrapped proteins under physiological conditions to understand the effect of formulation conditions on protein stability. CONCLUSIONS The disc-shaped thiolated chitosan-based hydrogels provide a potentially useful platform to deliver ranibizumab and aflibercept for the treatments of ocular diseases such as wet AMD, DME and corneal neovascularization.
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Affiliation(s)
- Miguel Moreno
- a NTU-Northwestern Institute for Nanomedicine (NNIN), School of Material Science & Engineering (MSE) , Nanyang Technological University (NTU) , Singapore
| | - Poh Yih Pow
- a NTU-Northwestern Institute for Nanomedicine (NNIN), School of Material Science & Engineering (MSE) , Nanyang Technological University (NTU) , Singapore
| | - Tan Su Teng Tabitha
- a NTU-Northwestern Institute for Nanomedicine (NNIN), School of Material Science & Engineering (MSE) , Nanyang Technological University (NTU) , Singapore
| | - Sonali Nirmal
- a NTU-Northwestern Institute for Nanomedicine (NNIN), School of Material Science & Engineering (MSE) , Nanyang Technological University (NTU) , Singapore
| | - Andreas Larsson
- b School of Biological Sciences , Nanyang Technological University , Singapore
| | - Krishna Radhakrishnan
- a NTU-Northwestern Institute for Nanomedicine (NNIN), School of Material Science & Engineering (MSE) , Nanyang Technological University (NTU) , Singapore
| | - Jayabalan Nirmal
- a NTU-Northwestern Institute for Nanomedicine (NNIN), School of Material Science & Engineering (MSE) , Nanyang Technological University (NTU) , Singapore
| | - Soo Tng Quah
- b School of Biological Sciences , Nanyang Technological University , Singapore
| | | | | | - Subbu Venkatraman
- a NTU-Northwestern Institute for Nanomedicine (NNIN), School of Material Science & Engineering (MSE) , Nanyang Technological University (NTU) , Singapore
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Tangso KJ, Patel H, Lindberg S, Hartley PG, Knott R, Spicer PT, Boyd BJ. Controlling the Mesostructure Formation within the Shell of Novel Cubic/Hexagonal Phase Cetyltrimethylammonium Bromide-Poly(acrylamide-acrylic acid) Capsules for pH Stimulated Release. ACS Appl Mater Interfaces 2015; 7:24501-24509. [PMID: 26457761 DOI: 10.1021/acsami.5b05821] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The self-assembly of ordered structures in mixtures of oppositely charged surfactant and polymer systems has been exploited in various cleaning and pharmaceutical applications and continue to attract much interest since their discovery in the late twentieth century. The ability to control the electrostatic and hydrophobic interactions that dictate the formation of liquid crystalline phases in these systems is advantageous in manipulation of structure and rendering them responsive to external stimuli. Nanostructured capsules comprised of the cationic surfactant, cetyltrimethylammonium bromide (CTAB), and the diblock copolymer poly(acrylamide-acrylic acid) (PAAm-AA) were prepared to assess their potential as pH responsive nanomaterials. Crossed-polarizing light microscopy (CPLM) and small-angle X-ray scattering (SAXS) identified coexisting Pm3n cubic and hexagonal phases at the surfactant-polymer interface. The hydrophobic and electrostatic interactions between the oppositely charged components were studied by varying temperature and solution pH, respectively, and were found to influence the liquid crystalline nanostructure formed. The lattice parameter of the mesophases and the fraction of cubic phase in the system decreased upon heating. Acidic conditions resulted in the loss of the highly ordered structures due to protonation of the carboxylic acid group, and subsequent reduction of attractive forces previously present between the oppositely charged molecules. The rate of release of the model hydrophilic drug, Rhodamine B (RhB), from nanostructured macro-sized capsules significantly increased when the pH of the solution was adjusted from pH 7 to pH 2. This allowed for immediate release of the compound of interest "on demand", opening new options for structured materials with increased functionality over typical layer-by-layer capsules.
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Affiliation(s)
- Kristian J Tangso
- Drug Delivery, Disposition and Dynamics and ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville Campus) , 381 Royal Parade, Parkville, Victoria 3052, Australia
| | - Hetika Patel
- School of Pharmacy, University College London , 29-39 Brunswick Square, London WC1N 1AX, United Kingdom
| | - Seth Lindberg
- The Procter and Gamble Company , Corporate Engineering Technical Laboratories Building, Cincinnati, Ohio 45069, United States
| | - Patrick G Hartley
- Commonwealth Scientific and Industrial Research Organization , Bag 10, Clayton South, Victoria 3169, Australia
| | - Robert Knott
- Bragg Institute, Australian Nuclear Science and Technology Organization , Menai, New South Wales 2234, Australia
| | - Patrick T Spicer
- School of Chemical Engineering, University of New South Wales , Sydney, New South Wales 2052, Australia
| | - Ben J Boyd
- Drug Delivery, Disposition and Dynamics and ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville Campus) , 381 Royal Parade, Parkville, Victoria 3052, Australia
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