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Fathipour M, Xu Y, Rana M. Magnetron-Sputtered Lead Titanate Thin Films for Pyroelectric Applications: Part 2-Electrical Characteristics and Characterization Methods. MATERIALS (BASEL, SWITZERLAND) 2024; 17:589. [PMID: 38591476 PMCID: PMC10856648 DOI: 10.3390/ma17030589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 01/11/2024] [Accepted: 01/20/2024] [Indexed: 04/10/2024]
Abstract
Pyroelectric materials are naturally electrically polarized and exhibits a built-in spontaneous polarization in their unit cell structure even in the absence of any externally applied electric field. These materials are regarded as one of the ideal detector elements for infrared applications because they have a fast response time and uniform sensitivity at room temperature across all wavelengths. Crystals of the perovskite lead titanate (PbTiO3) family show pyroelectric characteristics and undergo structural phase transitions. They have a high Curie temperature (the temperature at which the material changes from the ferroelectric (polar) to the paraelectric (nonpolar) phase), high pyroelectric coefficient, high spontaneous polarization, low dielectric constant, and constitute important component materials not only useful for infrared detection, but also with vast applications in electronic, optic, and MEMS devices. However, the preparation of large perfect and pure single crystals PbTiO3 is challenging. Additionally, difficulties arise in the application of such bulk crystals in terms of connection to processing circuits, large size, and high voltages required for their operation. In this part of the review paper, we explain the electrical behavior and characterization techniques commonly utilized to unravel the pyroelectric properties of lead titanate and its derivatives. Further, it explains how the material preparation techniques affect the electrical characteristics of resulting thin films. It also provides an in-depth discussion of the measurement of pyroelectric coefficients using different techniques.
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Affiliation(s)
- Morteza Fathipour
- Division of Physics, Engineering, Mathematics and Computer Sciences & Optical Science Center for Applied Research, Delaware State University, Dover, DE 19901, USA;
| | - Yanan Xu
- Division of Physics, Engineering, Mathematics and Computer Sciences, Delaware State University, Dover, DE 19901, USA;
| | - Mukti Rana
- Division of Physics, Engineering, Mathematics and Computer Sciences & Optical Science Center for Applied Research, Delaware State University, Dover, DE 19901, USA;
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De Jesús Valle MJ, Zarzuelo Castañeda A, Maderuelo C, Cencerrado Treviño A, Loureiro J, Coutinho P, Sánchez Navarro A. Development of a Mucoadhesive Vehicle Based on Lyophilized Liposomes for Drug Delivery through the Sublingual Mucosa. Pharmaceutics 2022; 14:pharmaceutics14071497. [PMID: 35890395 PMCID: PMC9317145 DOI: 10.3390/pharmaceutics14071497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 07/12/2022] [Accepted: 07/15/2022] [Indexed: 12/02/2022] Open
Abstract
A pharmaceutical vehicle based on lyophilized liposomes is proposed for the buccal administration of drugs aimed at systemic delivery through the sublingual mucosa. Liposomes made of egg phosphatidylcholine and cholesterol (7/3 molar ratio) were prepared and lyophilized in the presence of different additive mixtures with mucoadhesive and taste-masking properties. Palatability was assayed on healthy volunteers. The lyophilization cycle was optimized, and the lyophilized product was compressed to obtain round and capsule-shaped tables that were evaluated in healthy volunteers. Tablets were also assayed regarding weight and thickness uniformities, swelling index and liposome release. The results proved that lyophilized liposomes in unidirectional round tablets have palatability, small size, comfortability and buccal retention adequate for sublingual administration. In contact with water fluids, the tablets swelled, and rehydrated liposomes were released at a slower rate than permeation efficiency determined using a biomimetic membrane. Permeability efficiency values of 0.72 ± 0.34 µg/cm2/min and 4.18 ± 0.95 µg/cm2/min were obtained for the liposomes with and without additives, respectively. Altogether, the results point to the vehicle proposed as a liposomal formulation suitable for systemic drug delivery through the sublingual mucosa.
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Affiliation(s)
- María José De Jesús Valle
- Department of Pharmaceutical Sciences, Faculty of Pharmacy, University of Salamanca, 37007 Salamanca, Spain; (M.J.D.J.V.); (A.Z.C.); (C.M.); (A.C.T.)
- Institute of Biopharmaceutical Sciences, University of Salamanca, 37007 Salamanca, Spain
| | - Aranzazu Zarzuelo Castañeda
- Department of Pharmaceutical Sciences, Faculty of Pharmacy, University of Salamanca, 37007 Salamanca, Spain; (M.J.D.J.V.); (A.Z.C.); (C.M.); (A.C.T.)
- Institute of Biopharmaceutical Sciences, University of Salamanca, 37007 Salamanca, Spain
| | - Cristina Maderuelo
- Department of Pharmaceutical Sciences, Faculty of Pharmacy, University of Salamanca, 37007 Salamanca, Spain; (M.J.D.J.V.); (A.Z.C.); (C.M.); (A.C.T.)
- Institute of Biopharmaceutical Sciences, University of Salamanca, 37007 Salamanca, Spain
| | - Alejandro Cencerrado Treviño
- Department of Pharmaceutical Sciences, Faculty of Pharmacy, University of Salamanca, 37007 Salamanca, Spain; (M.J.D.J.V.); (A.Z.C.); (C.M.); (A.C.T.)
| | - Jorge Loureiro
- CPIRN-IPG—Center of Potential and Innovation of Natural Resources, Polytechnic Institute of Guarda, 6300-559 Guarda, Portugal; (J.L.); (P.C.)
- CICS-UBI—Health Sciences Research Centre, University of Beira Interior, 6200-506 Covilha, Portugal
| | - Paula Coutinho
- CPIRN-IPG—Center of Potential and Innovation of Natural Resources, Polytechnic Institute of Guarda, 6300-559 Guarda, Portugal; (J.L.); (P.C.)
- CICS-UBI—Health Sciences Research Centre, University of Beira Interior, 6200-506 Covilha, Portugal
| | - Amparo Sánchez Navarro
- Department of Pharmaceutical Sciences, Faculty of Pharmacy, University of Salamanca, 37007 Salamanca, Spain; (M.J.D.J.V.); (A.Z.C.); (C.M.); (A.C.T.)
- Institute of Biopharmaceutical Sciences, University of Salamanca, 37007 Salamanca, Spain
- Correspondence: ; Tel.: +34-677-584152
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Geremia M, Bano G, Tomba E, Barolo M, Bezzo F. Practical use of primary drying models in an industrial environment with limited availability of equipment sensors. Int J Pharm 2022; 619:121699. [PMID: 35337905 DOI: 10.1016/j.ijpharm.2022.121699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 03/01/2022] [Accepted: 03/20/2022] [Indexed: 10/18/2022]
Abstract
In the pharmaceutical industry, lyophilization is typically adopted to extend long-time stability of valuable thermolabile medicines and vaccines. Primary drying is the most time-consuming and energy-intensive step of the entire process; thus, accelerating and optimizing the primary drying recipe is a key process development goal. To that purpose, mathematical models have been proposed and successfully validated. However, models typically require invasive experiments and/or sensors (e.g. product temperatures) for parameter estimation, which are rarely available in good manufacturing practice (GMP) environment. This represents a severe limitation when leveraging the model to transfer operation recipes across different facilities and for scale-up. In this study, we assess the possibility to exploit limited industrial data for model parameter estimation, namely pressure measurements and gravimetric tests, by defining a calibration protocol that is tested on two different pieces of equipment. Results are verified on a recently proposed model, and show that statistically meaningful estimates can be obtained without the need of product temperature measurements, and that model predictions and optimal inputs trajectories are comparable to those obtained from the model calibrated using the full set of temperature and pressure data.
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Affiliation(s)
- Margherita Geremia
- CAPE-Lab - Computer-Aided Process Engineering Laboratory, Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova PD Italy
| | - Gabriele Bano
- GlaxoSmithKline, Park Road, Ware SG12 0DP, United Kingdom
| | - Emanuele Tomba
- GlaxoSmithKline, Via Fiorentina 1, 53100 Siena SI, Italy
| | - Massimiliano Barolo
- CAPE-Lab - Computer-Aided Process Engineering Laboratory, Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova PD Italy
| | - Fabrizio Bezzo
- CAPE-Lab - Computer-Aided Process Engineering Laboratory, Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova PD Italy.
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Abdelrahman TA, Motawea A, El-Dahhan MS, Abdelghani GM. Chitosan-dipotassium orthophosphate lyophilizate: a novel in situ thermogel carrier system of allogeneic platelet lysate growth factors. Drug Deliv 2022; 29:413-426. [PMID: 35098833 PMCID: PMC8812773 DOI: 10.1080/10717544.2022.2030429] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
The clinical success of platelet-rich plasma (PRP) is constrained by its limited mechanical strength, rapid disintegration by lytic enzymes, and the consequent short-term release of bioactive growth factors (GFs). Recently, attempts to formulate PRP and other hemoderivatives, such as platelet lysate (PL) have been underway. The current study aimed to formulate allogeneic freeze-dried human platelet lysate (HPL) onto lyophilized chitosan - dipotassium hydrogen orthophosphate (CS/DHO) thermo-sensitive scaffolds. A systemic approach was employed to optimize freeze-drying (FD) procedures targeting predefined critical quality attributes (CQAs). Thermal behavior, vibrational spectroscopy, morphological and moisture content analyses were used to detect possible protein destabilization during formulation and suboptimal cake properties. The effect of CS/DHO concentrations on thermo-responsiveness and release kinetics were investigated. Finally, six-months stability and cytotoxicity studies were carried out. An optimized lyophilizate was attainable with residual moisture of less than 5% and thermoresponsive to 33 °C in less than 3 min. HPL proteins were sustainedly released over five days in a pH-sensitive manner. The stability study indicated plausible physical and biochemical stability. Cell viability testing supported the cytocompatibility of the system. Finally, the lyophilizate variant of CS/DHO thermogel overcomes limited storage stability previously posed as a challenge in freshly prepared thermogels. The developed system overcomes the drawbacks of currently used PRP treatment and provides a novel GF-rich scaffold for wound repair.
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Affiliation(s)
- Toaa A Abdelrahman
- Department of Pharmaceutics, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | - Amira Motawea
- Department of Pharmaceutics, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | - Marwa S El-Dahhan
- Department of Pharmaceutics, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | - Galal M Abdelghani
- Department of Pharmaceutics, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
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Strategies and formulations of freeze-dried tablets for controlled drug delivery. Int J Pharm 2021; 597:120373. [PMID: 33577912 DOI: 10.1016/j.ijpharm.2021.120373] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 01/24/2021] [Accepted: 02/05/2021] [Indexed: 11/21/2022]
Abstract
The freeze-drying process has been particularly attractive for preparing tablets for controlled drug release. Although traditional methods, such as granulation or direct compression methods, have been used in various studies to produce tablets with controlled release, freeze-drying processes have been utilized in certain circumstances due to their distinct advantages. However, overall, further development of these strategies, which started with early studies on orally disintegrating tablets, is still necessary. In this review, the incorporation of different formulations into freeze-dried tablets will be discussed. Moreover, the use of excipients, freeze-drying conditions, formulation reconstitution and tablet structure for optimizing the performance of freeze-dried tablets will be reported, including strategies with nanoformulations and natural materials. Generally, this discussion with potential approaches will benefit further development of freeze-dried tablets containing drugs in the pharmaceutical industry.
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Assegehegn G, Brito-de la Fuente E, Franco JM, Gallegos C. Freeze-drying: A relevant unit operation in the manufacture of foods, nutritional products, and pharmaceuticals. ADVANCES IN FOOD AND NUTRITION RESEARCH 2020; 93:1-58. [PMID: 32711860 DOI: 10.1016/bs.afnr.2020.04.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Freeze-drying, a drying unit operation frequently used in food, pharmaceutical, and biopharmaceutical industries to prolong the shelf life of labile products, is an energy-intensive, time-consuming, and expensive process. Although all three steps (freezing, primary drying, and secondary drying) of freeze-drying are important, primary drying is the longest and most critical one. As sublimation during primary drying is mainly described in terms of heat and mass transfer, the present work provides extensive theoretical and experimental analyses of these processes. First, a detailed review of the current state-of-the art of freeze-drying, focusing on the drying stage, is given, which contributes to a fundamental understanding of the drying process. Second, a detailed experimental study of the drying section of the freeze-drying process is discussed, furnishing information on the relationship between input and output process parameters during the primary drying stage and thus aiding freeze-drying process design and optimization. In this regard, the influence of primary drying input parameters (i.e., shelf temperature and chamber pressure) and vial position on output parameters such as product temperature, sublimation rate, overall vial heat transfer coefficient, and resistance to mass transfer of the dried product are extensively discussed. For all combinations of shelf temperature and chamber pressure studied herein, the highest product temperature, sublimation rate, and overall vial heat transfer coefficient are observed in front edge vials, whereas the lowest values are observed in center vials. In general, the highest sublimation rate, at a given product temperature, is observed for low chamber pressure-high shelf temperature combinations.
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Affiliation(s)
- Getachew Assegehegn
- Fresenius-Kabi Deutschland GmbH, Product and Process Engineering Center, Global Manufacturing Pharmaceuticals, Bad Homburg, Germany
| | - Edmundo Brito-de la Fuente
- Fresenius-Kabi Deutschland GmbH, Product and Process Engineering Center, Global Manufacturing Pharmaceuticals, Bad Homburg, Germany
| | - José M Franco
- Departamento de Ingeniería Química, Pro2TecS-Chemical Product and Process Technology Research Centre, Complex Fluid Engineering Laboratory, Universidad de Huelva, Huelva, Spain
| | - Críspulo Gallegos
- Fresenius-Kabi Deutschland GmbH, Product and Process Engineering Center, Global Manufacturing Pharmaceuticals, Bad Homburg, Germany.
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