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Garner J, Skidmore S, Hadar J, Park H, Park K, Otte A, Jhon YK, Xu X, Qin B, Wang Y. Scanning Analysis of Sequential Semisolvent Vapor Impact To Study Naltrexone Release from Poly(lactide-co-glycolide) Microparticles. Mol Pharm 2022; 19:4286-4298. [PMID: 36166409 PMCID: PMC9643650 DOI: 10.1021/acs.molpharmaceut.2c00595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Poly(lactide-co-glycolide) (PLGA)-based microparticle formulations have been a mainstay of long-acting injectable drug delivery applications for decades. Despite a long history of use, tools and techniques to analyze and understand these formulations are still under development. Recently, a new characterization method was introduced known as the surface analysis after sequential semisolvent impact using sequential semisolvent vapors. The vapor-based technique is named, for convenience, surface analysis of (semisolvent) vapor impact (SAVI). In the SAVI method, discretely controlled quantities of selected organic semisolvents in the vapor phase were applied to PLGA microparticles to track particle morphological changes by laser scanning confocal microscopy. Subsequently, the morphological images were analyzed to calculate mean peak height (Sa), core height (Sk), kurtosis (Sku), dale void volume (Vvv), the density of peaks (Spd), maximum height (Hm), and the shape ratio (Rs). Here, the SAVI method was applied to naltrexone-loaded microparticles manufactured internally and Vivitrol, a commercial formulation. SAVI analysis of these microparticles indicated that the two primary mechanisms controlling the naltrexone release were the formation of discrete, self-crystallized portions of naltrexone within the PLGA structure and the degradation of PLGA chains through nucleophilic substitution. The relatively higher amounts of naltrexone crystals resulted in prolonged release than lower amounts of crystals. Data from gel permeation chromatography, differential scanning calorimetry, and in vitro release measurements all point to the importance of naltrexone crystal formation. This study highlights the utility of SAVI for gaining further insights into the microstructure of PLGA formulations and using SAVI data to support research, product development, and quality control applications for microparticle formulations of pharmaceuticals.
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Affiliation(s)
| | | | | | | | - Kinam Park
- Akina, Inc., West Lafayette, IN 47906, USA
- Purdue University, Biomedical Engineering and Pharmaceutics, West Lafayette, IN 47907, USA
| | - Andrew Otte
- Purdue University, Biomedical Engineering and Pharmaceutics, West Lafayette, IN 47907, USA
| | - Young Kuk Jhon
- Food and Drug Administration, Center for Drug Evaluation and Research, Office of Pharmaceutical Quality, Office of Lifecycle Drug Products, Silver Spring, MD 20993, USA
| | - Xiaoming Xu
- Food and Drug Administration, Center for Drug Evaluation and Research, Office of Pharmaceutical Quality, Office of Testing and Research, Silver Spring, MD 20993, USA
| | - Bin Qin
- Food and Drug Administration, Center for Drug Evaluation and Research, Office of Generic Drugs, Office of Research and Standards, Silver Spring, MD 20993, USA
| | - Yan Wang
- Food and Drug Administration, Center for Drug Evaluation and Research, Office of Generic Drugs, Office of Research and Standards, Silver Spring, MD 20993, USA
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Surface analysis of sequential semi-solvent vapor impact (SAVI) for studying microstructural arrangements of poly(lactide-co-glycolide) microparticles. J Control Release 2022; 350:600-612. [PMID: 36057396 DOI: 10.1016/j.jconrel.2022.08.052] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Revised: 08/25/2022] [Accepted: 08/26/2022] [Indexed: 11/21/2022]
Abstract
Biodegradable poly(lactide-co-glycolide) (PLGA) microparticles have been used as long-acting injectable (LAI) drug delivery systems for more than three decades. Despite extensive use, few tools have been available to examine and compare the three-dimensional (3D) structures of microparticles prepared using different compositions and processing parameters, all collectively affecting drug release kinetics. Surface analysis after sequential semi-solvent impact (SASSI) was conducted by exposing PLGA microparticles to different semi-solvent in the liquid phase. The use of semi-solvent liquids presented practical experimental difficulties, particularly in observing the same microparticles before and after exposure to semi-solvents. The difficulties were overcome by using a new sequential semi-solvent vapor (SSV) method to examine the morphological changes of the same microparticles. The SASSI method based on SSV is called surface analysis of semi-solvent vapor impact (SAVI). Semi-solvents are the solvents that dissolve PLGA polymers depending on the polymer's lactide:glycolide (L:G) ratio. A sequence of semi-solvents was used to dissolve portions of PLGA microparticles in an L:G ratio-dependent manner, thus revealing different structures depending on how microparticles were prepared. Exposing PLGA microparticles to semi-solvents in the vapor phase demonstrated significant advantages over using semi-solvents in the liquid phase, such as in control of exposure conditions, access to imaging, decreasing the time for sequential exposure of semi-solvents, and using the same microparticles. The SSV approach for morphological analysis provides another tool to enhance our understanding of the microstructural arrangement of PLGA polymers. It will improve our comprehensive understanding of the factors controlling drug release from LAI formulations based on PLGA polymers.
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Investigation of Alogliptin-Loaded In Situ Gel Implants by 23 Factorial Design with Glycemic Assessment in Rats. Pharmaceutics 2022; 14:pharmaceutics14091867. [PMID: 36145615 PMCID: PMC9501034 DOI: 10.3390/pharmaceutics14091867] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 08/29/2022] [Accepted: 09/01/2022] [Indexed: 12/03/2022] Open
Abstract
The aim of the study was to design injectable long-acting poly (lactide-co-glycolide) (PLGA)-based in situ gel implants (ISGI) loaded with the anti-diabetic alogliptin. Providing sustained therapeutic exposures and improving the pharmacological responses of alogliptin were targeted for achieving reduced dosing frequency and enhanced treatment outputs. In the preliminary study, physicochemical characteristics of different solvents utilized in ISGI preparation were studied to select a proper solvent possessing satisfactory solubilization capacity, viscosity, water miscibility, and affinity to PLGA. Further, an optimization technique using a 23 factorial design was followed. The blood glucose levels of diabetic rats after a single injection with the optimized formulation were compared with those who received daily oral alogliptin. N-methyl-2-pyrrolidone (NMP) and dimethyl sulfoxide (DMSO), as highly water-miscible and low viscous solvents, demonstrated their effectiveness in successful ISGI preparation and controlling the burst alogliptin release. The impact of increasing lactide concentration and PLGA amount on reducing the burst and cumulative alogliptin release was represented. The optimized formulation comprising 312.5 mg of PLGA (65:35) and DMSO manifested a remarkable decrease in the rats’ blood glucose levels throughout the study period in comparison to that of oral alogliptin solution. Meanwhile, long-acting alogliptin-loaded ISGI systems demonstrated their feasibility for treating type 2 diabetes with frequent dosage reduction and patient compliance enhancement.
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Kuehster L, Jhon YK, Wang Y, Smith WC, Xu X, Qin B, Zhang F, Lynd NA. Stochastic and Deterministic Analysis of Reactivity Ratios in the Partially Reversible Copolymerization of Lactide and Glycolide. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Louise Kuehster
- McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Young Kuk Jhon
- Office of Lifecycle Drug Products, United States Food and Drug Administration, Silver Spring, Maryland 20993, United States
- Office of Pharmaceutical Quality, United States Food and Drug Administration, Silver Spring, Maryland 20993, United States
- Center for Drug Evaluation and Research, United States Food and Drug Administration, Silver Spring, Maryland 20993, United States
| | - Yan Wang
- Center for Drug Evaluation and Research, United States Food and Drug Administration, Silver Spring, Maryland 20993, United States
- Office of Research and Standards, United States Food and Drug Administration, Silver Spring, Maryland 20993, United States
- Office of Generic Drugs, United States Food and Drug Administration, Silver Spring, Maryland 20993, United States
| | - William C. Smith
- Office of Pharmaceutical Quality, United States Food and Drug Administration, Silver Spring, Maryland 20993, United States
- Center for Drug Evaluation and Research, United States Food and Drug Administration, Silver Spring, Maryland 20993, United States
- Office of Testing and Research, United States Food and Drug Administration, Silver Spring, Maryland 20993, United States
| | - Xiaoming Xu
- Office of Pharmaceutical Quality, United States Food and Drug Administration, Silver Spring, Maryland 20993, United States
- Center for Drug Evaluation and Research, United States Food and Drug Administration, Silver Spring, Maryland 20993, United States
- Office of Testing and Research, United States Food and Drug Administration, Silver Spring, Maryland 20993, United States
| | - Bin Qin
- Center for Drug Evaluation and Research, United States Food and Drug Administration, Silver Spring, Maryland 20993, United States
- Office of Research and Standards, United States Food and Drug Administration, Silver Spring, Maryland 20993, United States
- Office of Generic Drugs, United States Food and Drug Administration, Silver Spring, Maryland 20993, United States
| | - Feng Zhang
- Molecular Pharmaceutics and Drug Delivery, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Nathaniel A. Lynd
- McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
- Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, United States
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Li X, Zhang Z, Harris A, Yang L. Bridging the gap between fundamental research and product development of long acting injectable PLGA microspheres. Expert Opin Drug Deliv 2022; 19:1247-1264. [PMID: 35863759 DOI: 10.1080/17425247.2022.2105317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
INTRODUCTION Long acting Injectable PLGA microspheres have gained more and more interest and attention in the field of life cycle management of pharmaceutical products due to their biocompatibility and biodegradability. So far, a multitude of trial-and-error experiments at lab scale have been used for establishing the correlation relationship between critical process parameters, critical material attributes and critical quality attributes. However, few published studies have elaborated on the development of PLGA microspheres from an industrial perspective. AREAS COVERED In this review, the scale-up feasibility of translational technologies of PLGA microspheres manufacturing have been evaluated. Additionally, state-of-the-art of technologies and facilities in PLGA development have been summarized. Meanwhile, the industrial knowledge matrix of PLGA microspheres development and research are establishing which provide comprehensive insight for understanding properties of PLGA microspheres as controlled/sustained release vehicle. EXPERT OPINION There is still big gap between fundamental research in academic institute and product development in pharmaceuticals. Therefore, the difference and connection between them should be identified gradually for better understanding of PLGA microspheres development.
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Affiliation(s)
- Xun Li
- Ferring Product Development China, Global R&D life cycle management department, Ferring Pharmaceuticals (Asia) Company Limited, Beijing China
| | - Zhanpeng Zhang
- Ferring Product Development China, Global R&D life cycle management department, Ferring Pharmaceuticals (Asia) Company Limited, Beijing China
| | - Alan Harris
- Global R&D life cycle management department, Ferring International Center SA, St-Prex, Switzerland
| | - Lin Yang
- Ferring Product Development China, Global R&D life cycle management department, Ferring Pharmaceuticals (Asia) Company Limited, Beijing China
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