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Doan-Nguyen TP, Mantala K, Atithep T, Crespy D. Osmotic Pressure as Driving Force for Reducing the Size of Nanoparticles in Emulsions. ACS NANO 2022; 17:940-954. [PMID: 36472438 DOI: 10.1021/acsnano.2c05565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
We describe here a method to decrease particle size of nanoparticles synthesized by miniemulsion polymerization. Small nanoparticles or nanocapsules were obtained by generating an osmotic pressure to induce the diffusion of monomer molecules from the dispersed phase of a miniemulsion before polymerization to an upper oil layer. The size reduction is dependent on the difference in concentration of monomer in the dispersed phase and in the upper oil layer and on the solubility of the monomer in water. By labeling the emulsion droplets with a copolymer of stearyl methacrylate and a polymerizable dye, we demonstrated that the migration of the monomer to the upper hexadecane layer relied on molecular diffusion rather than diffusion of monomer droplets to the oil layer. Moreover, surface tension measurements confirmed that the emulsions were still in the miniemulsion regime and not in the microemulsion regime. The particle size can be tuned by controlling the duration during which the miniemulsion stayed in contact with the hexadecane layer, the interfacial area between the miniemulsion and the hexadecane layer and by the concentration of surfactant. Our method was applied to reduce the size of polystyrene and poly(methyl methacrylate) nanoparticles, nanocapsules of a copolymer of styrene and methyl methacrylic acid, and silica nanocapsules. This work demonstrated that a successful reduction of nanoparticle size in the miniemulsion process can be achieved without using excess amounts of surfactant. The method relies on building osmotic pressure in oil droplets dispersed in water which acts as semipermeable membrane.
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Affiliation(s)
- Thao P Doan-Nguyen
- Max Planck-VISTEC Partner Laboratory for Sustainable Materials, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong 21210, Thailand
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong 21210, Thailand
| | - Kanyarat Mantala
- Max Planck-VISTEC Partner Laboratory for Sustainable Materials, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong 21210, Thailand
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong 21210, Thailand
| | - Thassanant Atithep
- Max Planck-VISTEC Partner Laboratory for Sustainable Materials, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong 21210, Thailand
| | - Daniel Crespy
- Max Planck-VISTEC Partner Laboratory for Sustainable Materials, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong 21210, Thailand
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong 21210, Thailand
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Rai R, Tripathi A, Bhattacharyya A. Bubble growth and detachment process in surfactant solutions: a study of 90% pure sodium dodecyl sulfate. PARTICULATE SCIENCE AND TECHNOLOGY 2022. [DOI: 10.1080/02726351.2022.2141162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ronal Rai
- Department of Physics, Sikkim University, Tadong, Gangtok, Sikkim, India
| | - Ajay Tripathi
- Department of Physics, Sikkim University, Tadong, Gangtok, Sikkim, India
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Arenas-Quevedo MG, Velasco-Medina AA, Gracia-Fadrique J. Critical and supercritical fatty amide synthesis. CHEM ENG COMMUN 2022. [DOI: 10.1080/00986445.2022.2092476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Miguel Gonzalo Arenas-Quevedo
- Facultad de Química, Departamento de Fisicoquímica, Universidad Nacional Autónoma de México, (UNAM), México, Ciudad de México
| | - Andrés Adolfo Velasco-Medina
- Facultad de Química, Departamento de Fisicoquímica, Universidad Nacional Autónoma de México, (UNAM), México, Ciudad de México
| | - Jesús Gracia-Fadrique
- Facultad de Química, Departamento de Fisicoquímica, Universidad Nacional Autónoma de México, (UNAM), México, Ciudad de México
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Kudo Y, Endo S, Fujita M, Ota A, Kamatari YO, Tanaka Y, Ishikawa T, Ikeda H, Okada T, Toyooka N, Fujimoto N, Matsunaga T, Ikari A. Discovery and Structure-Based Optimization of Novel Atg4B Inhibitors for the Treatment of Castration-Resistant Prostate Cancer. J Med Chem 2022; 65:4878-4892. [PMID: 35244402 DOI: 10.1021/acs.jmedchem.1c02113] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Autophagy inhibition is an attractive target for cancer therapy. In this study, we discovered inhibitors of Atg4B essential for autophagosome formation and evaluated their potential as therapeutics for prostate cancer. Seventeen compounds were identified as candidates after in silico screening and a thermal shift assay. Among them, compound 17 showed the most potent Atg4B inhibitory activity, inhibited autophagy induced by anti-castration-resistant prostate cancer (CRPC) drugs, and significantly enhanced apoptosis. Although 17 has been known as a phospholipase A2 (PLA2) inhibitor, other PLA2 inhibitors had no effect on Atg4B and autophagy. We then performed structural optimization based on molecular modeling and succeeded in developing 21f (by shortening the alkyl chain of 17), which was a potent competitive inhibitor for Atg4B (Ki = 3.1 μM) with declining PLA2 inhibitory potency. Compound 21f enhanced the anticancer activity of anti-CRPC drugs via autophagy inhibition. These findings suggest that 21f can be used as an adjuvant drug for therapy with anti-CRPC drugs.
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Affiliation(s)
- Yudai Kudo
- Laboratory of Biochemistry, Gifu Pharmaceutical University, Gifu 501-1196, Japan
| | - Satoshi Endo
- Laboratory of Biochemistry, Gifu Pharmaceutical University, Gifu 501-1196, Japan
| | - Mei Fujita
- Laboratory of Biochemistry, Gifu Pharmaceutical University, Gifu 501-1196, Japan
| | - Atsumi Ota
- Laboratory of Biochemistry, Gifu Pharmaceutical University, Gifu 501-1196, Japan
| | - Yuji O Kamatari
- Institute for Glyco-core Research (iGCORE), Gifu University, Gifu 501-1193, Japan.,United Graduate School of Drug Discovery and Medical Information Sciences, Gifu University, Gifu 501-1193, Japan
| | - Yoshimasa Tanaka
- Center for Medical Innovation, Nagasaki University, 1-7-1 Sakamoto, Nagasaki 852-8588, Japan
| | - Takeshi Ishikawa
- Graduate School of Science and Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan
| | - Hayato Ikeda
- Graduate School of Innovative Life Science, University of Toyama, Toyama 930-8555, Japan
| | - Takuya Okada
- Graduate School of Innovative Life Science, University of Toyama, Toyama 930-8555, Japan
| | - Naoki Toyooka
- Graduate School of Innovative Life Science, University of Toyama, Toyama 930-8555, Japan
| | - Naohiro Fujimoto
- Department of Urology, University of Occupational and Environmental Health, Kitakyushu 807-8555, Japan
| | - Toshiyuki Matsunaga
- Education Center of Green Pharmaceutical Sciences, Gifu Pharmaceutical University, Gifu 502-8585, Japan
| | - Akira Ikari
- Laboratory of Biochemistry, Gifu Pharmaceutical University, Gifu 501-1196, Japan
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Sweeney C, Dudhipala N, Thakkar R, Mehraj T, Marathe S, Gul W, ElSohly MA, Murphy B, Majumdar S. Impact of mucoadhesive agent inclusion on the intraocular pressure lowering profile of Δ 9-tetrahydrocannabinol-valine-hemisuccinate loaded nanoemulsions in New Zealand white rabbits. Int J Pharm 2022; 616:121564. [PMID: 35151817 DOI: 10.1016/j.ijpharm.2022.121564] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 02/01/2022] [Accepted: 02/06/2022] [Indexed: 01/01/2023]
Abstract
The current study aimed to determine the effect of inclusion of a mucoadhesive agent on the intensity and duration of intraocular pressure (IOP) lowering activity of Δ9-tetrahydrocannabinol-valine-hemisuccinate (THC-VHS) loaded in a nanoemulsion (THC-VHS-NE) formulation. THC-VHS-NE formulation with Carbopol®940NF added as a mucoadhesive agent (THC-VHS-NEC) was prepared using hot-homogenization followed by probe sonication and characterized. A comparative evaluation of the IOP lowering activity of THC-VHS-NEC, THC-VHS-NE, THC-NEC, and commercial latanoprost ophthalmic solution, was undertaken in normotensive New Zealand white rabbits. The effect of pH, surfactant concentration, and autoclave process on the IOP lowering activity of THC-VHS-NEC was also studied. The formulation demonstrated desired viscosity, physicochemical properties, and autoclave process stability. The THC-VHS-NEC formulation showed a significant (p < 0.05) improvement in the duration of IOP lowering activity, compared to THC-NEC and THC-VHS-NE. Moreover, in this model, THC-VHS-NEC was more effective than commercially available latanoprost ophthalmic formulation, in terms of both duration and intensity of IOP lowering. A change in formulation pH, surfactant concentration, or sterilization process did not impact the IOP lowering activity of THC-VHS-NEC. Overall, inclusion of a mucoadhesive agent in THC-VHS-NE formulation, significantly increased the duration of activity, and could lead to a once- or twice- a day dosing regimen.
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Affiliation(s)
- Corinne Sweeney
- Department of Pharmaceutics and Drug Delivery, University of Mississippi, University, MS 38677, United States
| | - Narendar Dudhipala
- Department of Pharmaceutics and Drug Delivery, University of Mississippi, University, MS 38677, United States
| | - Ruchi Thakkar
- Department of Pharmaceutics and Drug Delivery, University of Mississippi, University, MS 38677, United States
| | - Tabish Mehraj
- Department of Pharmaceutics and Drug Delivery, University of Mississippi, University, MS 38677, United States
| | - Sushrut Marathe
- Department of Pharmaceutics and Drug Delivery, University of Mississippi, University, MS 38677, United States
| | - Waseem Gul
- ElSohly Laboratories Inc., Oxford, MS 38655, United States
| | - Mahmoud A ElSohly
- Department of Pharmaceutics and Drug Delivery, University of Mississippi, University, MS 38677, United States; ElSohly Laboratories Inc., Oxford, MS 38655, United States; National Center for Natural Products Research, University of Mississippi, Oxford, MS 38677, United States
| | - Brian Murphy
- Emerald Biosciences Inc., Long Beach, CA 90803, United States
| | - Soumyajit Majumdar
- Department of Pharmaceutics and Drug Delivery, University of Mississippi, University, MS 38677, United States; Research Institute of Pharmaceutical Sciences, University of Mississippi, University, MS 38677, United States.
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Giarola LR, Coco JC, Sousa IMDO, Cefali LC, Ataide JA, Tavares GD, Rodrigues RAF, Foglio MA, Mazzola PG. Pterodon pubescens Benth (sucupira) microencapsulation influence on formulation stability outcome compared to non-encapsulated extract. J Drug Deliv Sci Technol 2022. [DOI: 10.1016/j.jddst.2021.102875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Vishnyakov A, Mao R, Kam K, Potanin A, Neimark AV. Interactions of Crosslinked Polyacrylic Acid Polyelectrolyte Gels with Nonionic and Ionic Surfactants. J Phys Chem B 2021; 125:13817-13828. [PMID: 34905689 DOI: 10.1021/acs.jpcb.1c08638] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The morphology and stability of surfactant-loaded polyelectrolyte gels are of great interest for a variety of personal care, cosmetic, and pharmaceutical products. However, the mechanisms of surfactant interactions with gel-forming polymers are poorly understood and experimentally challenging. The aim of this work is to explore in silico the specifics of surfactant absorption within polyelectrolyte gels drawing on the examples of typical non-ionic octaethylene glycol monooctyl ether (C8E8) and anionic sodium dodecyl sulfate (SDS) surfactants and polyacrylic acid modified with hydrophobic sidechains mimicking the practically important Carbopol polymer. Using the systematically parameterized coarse-grained dissipative particle dynamics models, we generate and characterize the equilibrium conformations and swelling of the polymer films in aqueous solutions with the surfactant concentrations varied up to the critical micelle concentration (cmc). We discover the striking difference in interactions of Carbopol-like polymers with nonionic and ionic surfactants under mildly acidic conditions. The sorption of C8E8 within the polymer film is found substantial. As the surfactant concentration increases, the polymer film swells and, close to cmc, becomes unstable due to the formation and growth of water pockets filled with surfactant micelles. Sorption of SDS at the same bulk concentrations is found much lower, with only about 1% of surfactant mass fraction achieved at cmc. As the SDS concentration increases further, a lamellae structure is formed within the film, which remains stable. Reduced swelling and higher stability indicate better prospects of using SDS-type surfactants with Carbopol-based gels in formulations for detergents and personal care products.
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Affiliation(s)
- Aleksey Vishnyakov
- Department of Chemical and Biochemical Engineering, Rutgers University, New Brunswick, New Jersey 08854, United States.,Skolkovo Institute of Technology, Moscow 143005, Russia
| | - Runfang Mao
- Department of Chemical and Biochemical Engineering, Rutgers University, New Brunswick, New Jersey 08854, United States
| | - Kimberly Kam
- Department of Chemical and Biochemical Engineering, Rutgers University, New Brunswick, New Jersey 08854, United States
| | - Andrei Potanin
- Colgate-Palmolive, Piscataway, New Jersey 08855, United States
| | - Alexander V Neimark
- Department of Chemical and Biochemical Engineering, Rutgers University, New Brunswick, New Jersey 08854, United States
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Milanović M, Ćirin D, Krstonošić V. The interactions in ternary system made of xanthan gum, Carbopol 940 and anionic/nonionic surfactant. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117696] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Hydrogel composite containing azelaic acid and tea tree essential oil as a therapeutic strategy for Propionibacterium and testosterone-induced acne. Drug Deliv Transl Res 2021; 12:2501-2517. [PMID: 34782995 PMCID: PMC9458693 DOI: 10.1007/s13346-021-01092-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/03/2021] [Indexed: 12/03/2022]
Abstract
Azelaic acid (AzA) is a USFDA bioactive prescribed against acne vulgaris. It possesses delivery challenges like poor aqueous solubility, low skin-penetrability, and dose-dependent side effects, which could be overcome by its synergistic combination with tea tree oil (TTO) as a microemulsion (ME)-based hydrogel composite. AzA-TTO ME was prepared to employ pseudo-ternary phase diagram construction. The best AzA-TTO ME was of uniform size (polydispersity index < 0.7), nano-range (~357.4 ± 2% nm), transmittance (> 90%), and negative zeta potential (−1.42 ± 0.25% mV) values. ME hydrogel composite with optimum rheological and textural attributes showed better permeation, retention, and skin-compliant characteristics, vis-a-vis marketed formulation (Aziderm™) when evaluated in Wistar rat skin. In vitro antibacterial efficacy in bacterial strains, i.e., Staphylococcus aureus, Propionibacterium acne, and Staphylococcus epidermidis, was evaluated employing agar well plate diffusion and broth dilution assay. ME hydrogel has shown an increase in zone of inhibition by two folds and a decrease in minimum inhibitory concentration (MIC) by eightfold against P. acnes vis-a-vis AzA. Finally, ME hydrogel composite exhibited a better reduction in the papule density (93.75 ± 1.64%) in comparison to Aziderm™ 72.69 ± 4.67%) on acne as developed in rats by inducing testosterone. Thus, the developed AzA-TTO ME hydrogel composite promises an efficacious and comparatively safer drug delivery system for the topical therapy of acne vulgaris.
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Krstonošić VS, Kalić MD, Dapčević-Hadnađev TR, Lončarević IS, Hadnađev MS. Physico-chemical characterization of protein stabilized oil-in-water emulsions. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.125045] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Clarke C, Spyropoulos F, Norton IT. A flow velocity dependence of dynamic surface tension in Plateau borders of foam. J Colloid Interface Sci 2020; 573:348-359. [PMID: 32298928 DOI: 10.1016/j.jcis.2020.04.028] [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: 12/07/2019] [Revised: 04/05/2020] [Accepted: 04/06/2020] [Indexed: 11/24/2022]
Abstract
HYPOTHESIS Liquid drainage through foams is a multiscale process, that primarily occurs through channels known as Plateau borders (PBs). Recent experimental studies of isolated PBs have observed variations in channel surface tension, γ, with liquid flow rate, Q, for systems containing soluble low molecular weight surfactant (LMWS). The current study proposes that the dynamic surface tension (DST) could be responsible for this effect, where the residence time of surfactant molecules in the PB is similar to the time required for their adsorption to the channel interface. EXPERIMENTS Profile geometries of isolated 'ideal' PB's were created in a bespoke experimental setup at controlled forced liquid flow rates. Average surfactant residence times, τRes, were calculated for solutions of Sodium dodecylsulfate (SDS), Tween 20 (T20) and Tween 80 (T80), and used to calculate corresponding average DST values in discrete regions of measured PB profiles. DST values were combined with microscale drainage theory to assess the potential physical implications on liquid flow. FINDINGS Significant variations in the magnitude of γ were calculated based on surfactant characteristics, where only the rapid adsorption of SDS was sufficient to produce DST values approaching equilibrium. These findings seriously question assumptions of near equilibrium surface tension in LMWS foam systems above their critical micelle concentration (CMC). Furthermore, the presence of surface tension gradients identified using this discrete approach, highlights the need to further refine the current theory to a continuous approach incorporating Marangoni effects.
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Affiliation(s)
- Christopher Clarke
- Department of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK.
| | - Fotis Spyropoulos
- Department of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - Ian T Norton
- Department of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
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Ávila DMDS, Zanatta RF, Scaramucci T, Aoki IV, Torres CRG, Borges AB. Randomized in situ trial on the efficacy of Carbopol in enhancing fluoride / stannous anti-erosive properties. J Dent 2020; 101:103347. [PMID: 32320729 DOI: 10.1016/j.jdent.2020.103347] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 04/13/2020] [Accepted: 04/15/2020] [Indexed: 11/29/2022] Open
Abstract
OBJECTIVE To evaluate if the bioadhesive polymer (Carbopol 980) could potentiate the protective effect of sodium fluoride with stannous chloride (FS) solution on the control of enamel erosive wear. METHODS Cylindrical bovine enamel specimens were polished and randomly allocated into three groups (n = 60): FS (500 ppm F- +800 ppm Sn2+ - positive control), FS + Carbopol (0.1% Carbopol), and ultrapure water (negative control). A randomized double-blind cross-over in situ model with three phases was used. In each phase, volunteers (n = 15) used a palatal appliance containing 4 specimens: two were submitted to an erosion model (2 h of pellicle formation; immersion in 1% citric acid, pH 2.3, for 5 min, 4x/day; 1 h intervals of saliva exposure; and treatment with the test solutions for 1 min, 2x/day). Besides erosion, the other two specimens were also subjected to abrasion (2x/day, 15 s) with active electric toothbrush, before the treatment with the solutions. After 5 days, enamel surface loss (μm) was evaluated by profilometry. Data were analyzed by two-way RM-ANOVA and Tukey tests (5%). RESULTS There were significant differences for both challenge and treatment factors. Erosion/abrasion challenge resulted in significantly higher enamel loss than erosion only (p < 0.05). The surface loss values for the erosion/remineralization model were (means ± SL): C = 14.7 ± 5.8b; FS = 9.0 ± 7.5ab; FS + Carbopol = 5.9 ± 3.8a; and for erosion/abrasion: C = 26.6 ± 10.1c; FS = 15.0 ± 8.8b; FS + Carbopol = 12.3 ± 7.9ab. CONCLUSION The association of Carbopol to the FS solution significantly protected the enamel against erosive wear, but it was not significantly superior to FS only. CLINICAL SIGNIFICANCE Under highly erosive and abrasive conditions, rinsing with solutions containing sodium fluoride plus stannous chloride, associated or not with the Carbopol polymer, is an effective approach to control enamel erosive wear.
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Affiliation(s)
- Daniele Mara da Silva Ávila
- Department of Restorative Dentistry, Institute of Science and Technology, São Paulo State University-UNESP, São Paulo, Brazil.
| | - Rayssa Ferreira Zanatta
- Department of Restorative Dentistry, Institute of Science and Technology, São Paulo State University-UNESP, São Paulo, Brazil; Department of Restorative Dentistry, Dental School, University of Taubaté, Taubaté, Brazil.
| | - Tais Scaramucci
- Department of Restorative Dentistry, São Paulo University-USP, São Paulo, Brazil.
| | - Idalina Vieira Aoki
- Department of Chemical Engineering, Polytechnic School, São Paulo University-USP, São Paulo, Brazil.
| | - Carlos Rocha Gomes Torres
- Department of Restorative Dentistry, Institute of Science and Technology, São Paulo State University-UNESP, São Paulo, Brazil.
| | - Alessandra Bühler Borges
- Department of Restorative Dentistry, Institute of Science and Technology, São Paulo State University-UNESP, São Paulo, Brazil.
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Influence of Acetylated Annealed Starch on the Release of β-Escin from the Anionic and Non-Ionic Hydrophilic Gels. Pharmaceutics 2020; 12:pharmaceutics12010084. [PMID: 31968699 PMCID: PMC7023413 DOI: 10.3390/pharmaceutics12010084] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 01/08/2020] [Accepted: 01/16/2020] [Indexed: 01/10/2023] Open
Abstract
Naturally sourced products introduced to human nutrition and rediscovered for therapy include polysaccharides from potatoes. The starch may obtain unique properties via acetylation with acetic anhydride at 13 cm3/100 g of starch as the basic dose of reagent used in industrial conditions. The hydrogel formulation was applied as a carrier for escin included in the dry extract of Aesculus hippocastanum. Six hydrogels were evaluated (methylcellulose, polyacrylic acid-Carbopol 980 NF and polyacrylate crosspolymer 11—Aristoflex Velvet) with various concentrations of the modified starch. The kinetic studies of in vitro β-escin release were carried out in purified water at 37 ± 0.5 °C using a paddle apparatus at 50 rpm and a time period of 7 h. The criterion for the most suitable model was based on a high correlation coefficient of evaluated release profiles. The addition of modified annealed acetylated potato starch resulted in prolongation of β-escin release.
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Self-Assembly of the Bio-Surfactant Aescin in Solution: A Small-Angle X-ray Scattering and Fluorescence Study. COLLOIDS AND INTERFACES 2019. [DOI: 10.3390/colloids3020047] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
This work investigates the temperature-dependent micelle formation as well as the micellar structure of the saponin aescin. The critical micelle concentration ( c m c ) of aescin is determined from the concentration-dependent autofluorescence (AF) of aescin. Values between c m c aescin , AF (10 ∘ C) = 0.38 ± 0.09 mM and c m c aescin , AF (50 ∘ C) = 0.32 ± 0.13 mM were obtained. The significance of this method is verified by tensiometry measurements. The value determined from this method is within the experimental error identical with values obtained from autofluorescence ( c m c aescin , T ( WP ) (23 ∘ C) = 0.33 ± 0.02 mM). The structure of the aescin micelles was investigated by small-angle X-ray scattering (SAXS) at 10 and 40 ∘ C. At low temperature, the aescin micelles are rod-like, whereas at high temperature the structure is ellipsoidal. The radii of gyration were determined to ≈31 Å (rods) and ≈21 Å (ellipsoid). The rod-like shape of the aescin micelles at low temperature was confirmed by transmission electron microscopy (TEM). All investigations were performed at a constant pH of 7.4, because the acidic aescin has the ability to lower the pH value in aqueous solution.
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16
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Application of different techniques in the determination of xanthan gum-SDS and xanthan gum-Tween 80 interaction. Food Hydrocoll 2019. [DOI: 10.1016/j.foodhyd.2018.07.040] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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17
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Luo JJ, Pan SW, Yang JH, Chang TL, Lin PY, Wu CL, Liu WF, Huang XR, Koshevoy IO, Chou PT, Ho ML. Detecting Glucose Levels in Blood Plasma and Artificial Tear by Au(I) Complex on the Carbopol Polymer: A Microfluidic Paper-Based Method. Polymers (Basel) 2018; 10:E1001. [PMID: 30960926 PMCID: PMC6404068 DOI: 10.3390/polym10091001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Revised: 08/18/2018] [Accepted: 09/03/2018] [Indexed: 11/16/2022] Open
Abstract
We report on a selective paper-based method and a microfluidic paper-based analytical device (μPAD) for the detection of human plasma glucose and tear glucose using carbopol polymer-encapsulated Au(I) complex (AuC₂C₆H₄OMe)₂(Ph₂P(C₆H₄)₃PPh₂), (B5). To the best of our knowledge, this demonstrates for the first time the glucose sensing based on dual emission, i.e., fluorescence and phosphorescence, of a single type molecule on the carbopol polymer. Upon addition of human blood treated with anticoagulants to μPADs, plasma is separated from the blood and flows into the response region of the μPADs to react with carbopol polymer-encapsulated B5, in which the ratiometric luminescence is analyzed. The plasma glucose concentration can be quantitively detected at 1.0⁻50.0 mM on paper, and tear glucose can be detected at 0.1⁻4.0 mM on μPADs. Owing to the structural design, this device has superior ratiometric changes of dual emission over other Au(I) complexes for signal transduction. The encapsulation of carbopol polymer also offers long-term storage stability. In tear measurement, carbopol polymer is not only used to encapsulate enzyme to remain the enzyme's activity, but also played as a glue (or media) to connect microfluidic channel and response region. This further improves the sensitivity and limit of detection for glucose. Moreover, this sensor provides a faster response time, a wider range for glucose sensing than reported previously, and no statistical difference of the data from a commercial glucometer, allowing for practical diagnosis of diabetes and healthy individuals.
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Affiliation(s)
- Jong-Jheng Luo
- Department of Chemistry, Soochow University, No 70, LinShih Rd., Shih-Lin, Taipei 11102, Taiwan.
| | - Sheng-Wei Pan
- Department of Chest Medicine, Taipei Veterans General Hospital, Taipei 11217, Taiwan.
- School of Medicine, National Yang-Ming University, Taipei 11221, Taiwan.
- Institute of Public Health, National Yang-Ming University, Taipei 11102, Taiwan.
| | - Jia-Hui Yang
- Department of Chemistry, Soochow University, No 70, LinShih Rd., Shih-Lin, Taipei 11102, Taiwan.
| | - Tian-Lin Chang
- Department of Chemistry, Soochow University, No 70, LinShih Rd., Shih-Lin, Taipei 11102, Taiwan.
| | - Peng-Yi Lin
- Department of Chemistry, Soochow University, No 70, LinShih Rd., Shih-Lin, Taipei 11102, Taiwan.
| | - Chen-Liang Wu
- Department of Chemistry, Soochow University, No 70, LinShih Rd., Shih-Lin, Taipei 11102, Taiwan.
| | - Wei-Fang Liu
- Department of Chemistry, Soochow University, No 70, LinShih Rd., Shih-Lin, Taipei 11102, Taiwan.
| | - Xin-Ru Huang
- Department of Chemistry, Soochow University, No 70, LinShih Rd., Shih-Lin, Taipei 11102, Taiwan.
| | - Igor O Koshevoy
- Department of Chemistry, University of Eastern Finland, 80101, Joensuu, Finland.
| | - Pi-Tai Chou
- National Taiwan University, Department of Chemistry, Taipei 11102, Taiwan.
| | - Mei-Lin Ho
- Department of Chemistry, Soochow University, No 70, LinShih Rd., Shih-Lin, Taipei 11102, Taiwan.
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Darji MA, Lalge RM, Marathe SP, Mulay TD, Fatima T, Alshammari A, Lee HK, Repka MA, Narasimha Murthy S. Excipient Stability in Oral Solid Dosage Forms: A Review. AAPS PharmSciTech 2018; 19:12-26. [PMID: 28895106 DOI: 10.1208/s12249-017-0864-4] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Accepted: 08/21/2017] [Indexed: 01/12/2023] Open
Abstract
The choice of excipients constitutes a major part of preformulation and formulation studies during the preparation of pharmaceutical dosage forms. The physical, mechanical, and chemical properties of excipients affect various formulation parameters, such as disintegration, dissolution, and shelf life, and significantly influence the final product. Therefore, several studies have been performed to evaluate the effect of drug-excipient interactions on the overall formulation. This article reviews the information available on the physical and chemical instabilities of excipients and their incompatibilities with the active pharmaceutical ingredient in solid oral dosage forms, during various drug-manufacturing processes. The impact of these interactions on the drug formulation process has been discussed in detail. Examples of various excipients used in solid oral dosage forms have been included to elaborate on different drug-excipient interactions.
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19
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Influence of Hydrophilic Polymers on theβFactor in Weibull Equation Applied to the Release Kinetics of a Biologically Active Complex ofAesculus hippocastanum. INT J POLYM SCI 2017. [DOI: 10.1155/2017/3486384] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Triterpenoid saponins complex of biological origin, escin, exhibits significant clinical activity in chronic venous insufficiency, skin inflammation, epidermal abrasions, allergic dermatitis, and acute impact injuries, especially in topical application. The aim of the study is the comparison of various hydrogel formulations, as carriers for a horse chestnut seed extract (EH). Methylcellulose (MC), two polyacrylic acid derivatives (PA1 and PA2), and polyacrylate crosspolymer 11 (PC-11) were employed. The release rates of EH were examined and a comparison with the Weibull model equation was performed. Application of MC as the carrier in the hydrogel preparation resulted in fast release rate of EH, whereas in the case of the hydrogel composed with PC-11 the release was rather prolonged. Applied Weibull function adhered best to the experimental data. Due to the evaluated shape parameterβ, in the Weibull equation, the systems under study released the active compound according to the Fickian diffusion.
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Schenck DM, Fiegel J. Tensiometric and Phase Domain Behavior of Lung Surfactant on Mucus-like Viscoelastic Hydrogels. ACS APPLIED MATERIALS & INTERFACES 2016; 8:5917-5928. [PMID: 26894883 PMCID: PMC5226205 DOI: 10.1021/acsami.6b00294] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Lung surfactant has been observed at all surfaces of the airway lining fluids and is an important contributor to normal lung function. In the conducting airways, the surfactant film lies atop a viscoelastic mucus gel. In this work, we report on the characterization of the tensiometric and phase domain behavior of lung surfactant at the air-liquid interface of mucus-like viscoelastic gels. Poly(acrylic acid) hydrogels were formulated to serve as a model mucus with bulk rheological properties that matched those of tracheobronchial mucus secretions. Infasurf (Calfactant), a commercially available pulmonary surfactant derived from calf lung extract, was spread onto the hydrogel surface. The surface tension lowering ability and relaxation of Infasurf films on the hydrogels was quantified and compared to Infasurf behavior on an aqueous subphase. Infasurf phase domains during surface compression were characterized by fluorescence microscopy and phase shifting interferometry. We observed that increasing the bulk viscoelastic properties of the model mucus hydrogels reduced the ability of Infasurf films to lower surface tension and inhibited film relaxation. A shift in the formation of Infasurf condensed phase domains from smaller, more spherical domains to large, agglomerated, multilayer structures was observed with increasing viscoelastic properties of the subphase. These studies demonstrate that the surface behavior of lung surfactant on viscoelastic surfaces, such as those found in the conducting airways, differs significantly from aqueous, surfactant-laden systems.
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Affiliation(s)
- Daniel M. Schenck
- Department of Pharmaceutical Sciences and Experimental Therapeutics, The University of Iowa, Iowa City, IA, 52242, USA
| | - Jennifer Fiegel
- Department of Pharmaceutical Sciences and Experimental Therapeutics, The University of Iowa, Iowa City, IA, 52242, USA
- Department of Chemical and Biochemical Engineering, The University of Iowa, Iowa City, IA, 52242, USA
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