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Nollet M, Laurichesse E, Schmitt V. Double Emulsions Stabilized by PGPR and Arabic Gum as Capsules: The Surprising Stabilizing Role of Inner Droplets. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:1646-1657. [PMID: 38206825 DOI: 10.1021/acs.langmuir.3c02554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2024]
Abstract
The encapsulation efficiency and stability over time of either vitamin B12, a model hydrophilic drug, or an aqueous suspension of Cydia pomonella granulovirus (CpGV), which is a biopesticide, using a water-in-sunflower oil-in-water (W1/O/W2) double emulsion, are studied. Two antagonistic stabilizers are used to prepare the double emulsion: the mainly lipophilic polyglycerol polyricinoleate (PGPR) and the mainly hydrophilic polysaccharide Arabic gum (AG). Combining ultraviolet-visible (UV-visible) titration, rheology, and oil globule size measurement allows assessing drug release, emulsion elasticity, and globule evolution as a function of time. A stability diagram is plotted as a function of two determining parameters: the nonadsorbed PGPR concentration in the oil and the inner water droplet fraction. To understand the presence of the nonstability domains, the influence of the two identified parameters on the outermost interfacial tension is examined. Surprisingly, the inner water drop volume fraction exhibits a stabilizing phenomenon that is discussed in terms of interfacial shielding to PGPR adsorption.
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Affiliation(s)
- Maxime Nollet
- Université de Bordeaux, Centre de Recherche Paul Pascal, CNRS UMR 5031, 115 Av. A. Schweitzer, 33600 Pessac, France
| | - Eric Laurichesse
- Université de Bordeaux, Centre de Recherche Paul Pascal, CNRS UMR 5031, 115 Av. A. Schweitzer, 33600 Pessac, France
| | - Véronique Schmitt
- Université de Bordeaux, Centre de Recherche Paul Pascal, CNRS UMR 5031, 115 Av. A. Schweitzer, 33600 Pessac, France
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Curia S, Ng F, Cagnon ME, Nicoulin V, Lopez-Noriega A. Poly(ethylene glycol)- b-poly(1,3-trimethylene carbonate) Amphiphilic Copolymers for Long-Acting Injectables: Synthesis, Non-Acylating Performance and In Vivo Degradation. Molecules 2021; 26:molecules26051438. [PMID: 33800940 PMCID: PMC7962012 DOI: 10.3390/molecules26051438] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Revised: 03/02/2021] [Accepted: 03/02/2021] [Indexed: 02/02/2023] Open
Abstract
This article presents the evaluation of diblock and triblock poly(ethylene glycol)-b-poly(1,3-trimethylene carbonate) amphiphilic copolymers (PEG-PTMCs) as excipients for the formulation of long-acting injectables (LAIs). Copolymers were successfully synthesised through bulk ring-opening polymerisation. The concomitant formation of PTMC homopolymer could not be avoided irrespective of the catalyst amount, but the by-product could easily be removed by gel chromatography. Pure PEG-PTMCs undergo faster erosion in vivo than their corresponding homopolymer. Furthermore, these copolymers show outstanding stability compared to their polyester analogues when formulated with amine-containing reactive drugs, which makes them particularly suitable as LAIs for the sustained release of drugs susceptible to acylation.
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Development of bi-polymer lipid hybrid nanocarrier (BLN) to improve the entrapment and stability of insulin for efficient oral delivery. J Drug Deliv Sci Technol 2019. [DOI: 10.1016/j.jddst.2019.01.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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Bee SL, Hamid ZAA, Mariatti M, Yahaya BH, Lim K, Bee ST, Sin LT. Approaches to Improve Therapeutic Efficacy of Biodegradable PLA/PLGA Microspheres: A Review. POLYM REV 2018. [DOI: 10.1080/15583724.2018.1437547] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Soo-Ling Bee
- School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal, Penang, Malaysia
| | - Z. A. Abdul Hamid
- School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal, Penang, Malaysia
| | - M. Mariatti
- School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal, Penang, Malaysia
| | - B. H. Yahaya
- Regenerative Medicine Cluster, Advanced Medical and Dental Institute, Universiti Sains Malaysia, Penang, Malaysia
| | - Keemi Lim
- School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal, Penang, Malaysia
| | - Soo-Tueen Bee
- Department of Chemical Engineering, Lee Kong Chian Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, Jalan Sungai Long, Bandar Sungai Long, Cheras, Kajang, Selangor, Malaysia
| | - Lee Tin Sin
- Department of Chemical Engineering, Lee Kong Chian Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, Jalan Sungai Long, Bandar Sungai Long, Cheras, Kajang, Selangor, Malaysia
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Nollet M, Laurichesse E, Besse S, Soubabère O, Schmitt V. Determination of Formulation Conditions Allowing Double Emulsions Stabilized by PGPR and Sodium Caseinate to Be Used as Capsules. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:2823-2833. [PMID: 29406736 DOI: 10.1021/acs.langmuir.7b04085] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Water-in-oil-in-water (W1/O/W2) double emulsions stabilized by polyglycerol polyricinoleate (PGPR), a lipophilic food grade small polymer, and sodium caseinate, a hydrophilic milk protein, were developed to encapsulate vitamin B12, a model hydrophilic substance easy to titrate. Using rheology, sensitive to drop size evolution and water fluxes, static light scattering, and microscopy both giving the evolution of drops' size and vitamin B12 titration assessing the encapsulation, we were able to detect independently the double emulsion drop size, the encapsulation loss, and the flux of water as a function of time. By differentiating the PGPR required to cover the W1-droplets' surface from PGPR in excess in the oil phase, we built a PGPR-inner droplet volume fraction diagram highlighting the domains where the double emulsion is stable toward encapsulation and/or water fluxes. We demonstrated the key role played by nonadsorbed PGPR concentration in the intermediate sunflower oil phase on the emulsion stability while, surprisingly, the inner droplet volume fraction had no effect on the emulsion stability. At low PGPR concentration, a release of vitamin B12 was observed and the leakage mechanism of coalescence between droplets and oil-water interface of the oily drops (also called globules hereafter), was identified using confocal microscopy. For high enough PGPR content, the emulsions were stable and may therefore serve as efficient capsules without need of an additional gelling, thickening, complexion or interface rigidifying agent. We generalized these results with the encapsulation of an insecticide: Cydia pomonella granulovirus used in organic arboriculture.
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Affiliation(s)
- Maxime Nollet
- Université de Bordeaux, Centre de Recherche Paul Pascal, CNRS UMR 5031, 115 Av. A. Schweitzer, 33600 Pessac, France
| | - Eric Laurichesse
- Université de Bordeaux, Centre de Recherche Paul Pascal, CNRS UMR 5031, 115 Av. A. Schweitzer, 33600 Pessac, France
| | - Samantha Besse
- Natural Plant Protection, Arysta LifeScience's group, Parc d'activités Pau-Pyrénées, 35 avenue Léon Blum, 64000 Pau, France
| | - Olivier Soubabère
- Natural Plant Protection, Arysta LifeScience's group, Parc d'activités Pau-Pyrénées, 35 avenue Léon Blum, 64000 Pau, France
| | - Véronique Schmitt
- Université de Bordeaux, Centre de Recherche Paul Pascal, CNRS UMR 5031, 115 Av. A. Schweitzer, 33600 Pessac, France
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Tomar L, Tyagi C, Kumar M, Kumar P, Singh H, Choonara YE, Pillay V. In vivo evaluation of a conjugated poly(lactide-ethylene glycol) nanoparticle depot formulation for prolonged insulin delivery in the diabetic rabbit model. Int J Nanomedicine 2013; 8:505-20. [PMID: 23429428 PMCID: PMC3575164 DOI: 10.2147/ijn.s38011] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Indexed: 11/23/2022] Open
Abstract
Poly(ethylene glycol) (PEG) and polylactic acid (PLA)-based copolymeric nanoparticles were synthesized and investigated as a carrier for prolonged delivery of insulin via the parenteral route. Insulin loading was simultaneously achieved with particle synthesis using a double emulsion solvent evaporation technique, and the effect of varied PEG chain lengths on particle size and insulin loading efficiency was determined. The synthesized copolymer and nanoparticles were analyzed by standard polymer characterization techniques of gel permeation chromatography, dynamic light scattering, nuclear magnetic resonance, and transmission electron microscopy. In vitro insulin release studies performed under simulated conditions provided a near zero-order release pattern up to 10 days. In vivo animal studies were undertaken with varied insulin loads of nanoparticles administered subcutaneously to fed diabetic rabbits and, of all doses administered, nanoparticles containing 50 IU of insulin load per kg body weight controlled the blood glucose level within the physiologically normal range of 90-140 mg/dL, and had a prolonged effect for more than 7 days. Histopathological evaluation of tissue samples from the site of injection showed no signs of inflammation or aggregation, and established the nontoxic nature of the prepared copolymeric nanoparticles. Further, the reaction profiles for PLA-COOH and NH(2)-PEGDA-NH(2) were elucidated using molecular mechanics energy relationships in vacuum and in a solvated system by exploring the spatial disposition of various concentrations of polymers with respect to each other. Incorporation of insulin within the polymeric matrix was modeled using Connolly molecular surfaces. The computational results corroborated the experimental and analytical data. The ability to control blood glucose levels effectively coupled with the nontoxic behavior of the nanoparticles indicates that these nanoparticles are a potential candidate for insulin delivery.
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Affiliation(s)
- Lomas Tomar
- University of the Witwatersrand, Faculty of Health Sciences, Department of Pharmacy and Pharmacology, Johannesburg, Gauteng, South Africa
- Centre for Biomedical Engineering, Indian Institute of Technology, Delhi, India
| | - Charu Tyagi
- University of the Witwatersrand, Faculty of Health Sciences, Department of Pharmacy and Pharmacology, Johannesburg, Gauteng, South Africa
- VSPG College, Chaudhary Charan Singh University, Meerut, India
| | - Manoj Kumar
- Centre for Biomedical Engineering, Indian Institute of Technology, Delhi, India
| | - Pradeep Kumar
- University of the Witwatersrand, Faculty of Health Sciences, Department of Pharmacy and Pharmacology, Johannesburg, Gauteng, South Africa
| | - Harpal Singh
- Centre for Biomedical Engineering, Indian Institute of Technology, Delhi, India
| | - Yahya E Choonara
- University of the Witwatersrand, Faculty of Health Sciences, Department of Pharmacy and Pharmacology, Johannesburg, Gauteng, South Africa
| | - Viness Pillay
- University of the Witwatersrand, Faculty of Health Sciences, Department of Pharmacy and Pharmacology, Johannesburg, Gauteng, South Africa
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