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Kulinowski P, Malczewski P, Łaszcz M, Baran E, Milanowski B, Kuprianowicz M, Dorożyński P. Development of Composite, Reinforced, Highly Drug-Loaded Pharmaceutical Printlets Manufactured by Selective Laser Sintering-In Search of Relevant Excipients for Pharmaceutical 3D Printing. Materials (Basel) 2022; 15:ma15062142. [PMID: 35329594 PMCID: PMC8950795 DOI: 10.3390/ma15062142] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 03/06/2022] [Accepted: 03/09/2022] [Indexed: 02/04/2023]
Abstract
3D printing by selective laser sintering (SLS) of high-dose drug delivery systems using pure brittle crystalline active pharmaceutical ingredients (API) is possible but impractical. Currently used pharmaceutical grade excipients, including polymers, are primarily designed for powder compression, ensuring good mechanical properties. Using these excipients for SLS usually leads to poor mechanical properties of printed tablets (printlets). Composite printlets consisting of sintered carbon-stained polyamide (PA12) and metronidazole (Met) were manufactured by SLS to overcome the issue. The printlets were characterized using DSC and IR spectroscopy together with an assessment of mechanical properties. Functional properties of the printlets, i.e., drug release in USP3 and USP4 apparatus together with flotation assessment, were evaluated. The printlets contained 80 to 90% of Met (therapeutic dose ca. 600 mg), had hardness above 40 N (comparable with compressed tablets) and were of good quality with internal porous structure, which assured flotation. The thermal stability of the composite material and the identity of its constituents were confirmed. Elastic PA12 mesh maintained the shape and structure of the printlets during drug dissolution and flotation. Laser speed and the addition of an osmotic agent in low content influenced drug release virtually not changing composition of the printlet; time to release 80% of Met varied from 0.5 to 5 h. Composite printlets consisting of elastic insoluble PA12 mesh filled with high content of crystalline Met were manufactured by 3D SLS printing. Dissolution modification by the addition of an osmotic agent was demonstrated. The study shows the need to define the requirements for excipients dedicated to 3D printing and to search for appropriate materials for this purpose.
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Affiliation(s)
- Piotr Kulinowski
- Institute of Technology, Pedagogical University of Cracow, Podchorążych 2, 30-084 Cracow, Poland; (P.K.); (P.M.); (E.B.)
| | - Piotr Malczewski
- Institute of Technology, Pedagogical University of Cracow, Podchorążych 2, 30-084 Cracow, Poland; (P.K.); (P.M.); (E.B.)
| | - Marta Łaszcz
- Department of Falsified Medicines and Medical Devices, National Medicines Institute, Chełmska 30/34, 00-725 Warsaw, Poland;
| | - Ewelina Baran
- Institute of Technology, Pedagogical University of Cracow, Podchorążych 2, 30-084 Cracow, Poland; (P.K.); (P.M.); (E.B.)
| | - Bartłomiej Milanowski
- Chair and Department of Pharmaceutical Technology, Poznan University of Medical Sciences, ul. Grunwaldzka 6, 60-780 Poznan, Poland;
- GENERICA Pharmaceutical Lab, Regionalne Centrum Zdrowia Sp. z o.o., Na Kępie 3, 64-360 Zbąszyń, Poland;
| | - Mateusz Kuprianowicz
- GENERICA Pharmaceutical Lab, Regionalne Centrum Zdrowia Sp. z o.o., Na Kępie 3, 64-360 Zbąszyń, Poland;
| | - Przemysław Dorożyński
- Department of Drug Technology and Pharmaceutical Biotechnology, Medical University of Warsaw, Banacha 1, 02-097 Warsaw, Poland
- Department of Spectroscopic Methods, National Medicines Institute, Chełmska 30/34, 00-725 Warsaw, Poland
- Correspondence:
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Hyjek P, Sulima I, Malczewski P, Bryła K, Jaworska L. Effect of Reactive SPS on the Microstructure and Properties of a Dual-Phase Ni-Al Intermetallic Compound and Ni-Al-TiB 2 Composite. Materials (Basel) 2020; 13:ma13245668. [PMID: 33322570 PMCID: PMC7763236 DOI: 10.3390/ma13245668] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 12/09/2020] [Accepted: 12/09/2020] [Indexed: 12/02/2022]
Abstract
As part of the tests, a two-phase NiAl/Ni3Al alloy and a composite based on this alloy with 4 vol% addition of TiB2 were produced by the reactive FAST/SPS (Field Assisted Sintering Technology/Spark Plasma Sintering) sintering method. The sintering process was carried out at 1273 K for 30 s under an argon atmosphere. The effect of reactive SPS on the density, microstructure, and mechanical and tribological properties of a dual-phase Ni-Al intermetallic compound and Ni-Al-TiB2 composite was investigated. Products obtained were characterized by a high degree of sintering (over 99% of the theoretical density). The microstructure of sinters was characterized by a large diversity, mainly in regard to the structure of the dual-phase alloy (matrix). Compression tests showed satisfactory plastic properties of the manufactured materials, especially at high temperature (1073 K). For both materials at room temperature, the compressive strength was over 3 GPa. The stress–strain curves were observed to assume a different course for the matrix material and composite material, including differences in the maximum plastic flow stress depending on the test temperature. The brittle-to-ductile transition temperature was determined to be above 873 K. The research has revealed differences in the physical, mechanical and tribological properties of the produced sinters. However, the differences favourable for the composite were mostly the result of the addition of TiB2 ceramic particles uniformly distributed on grain boundaries.
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Affiliation(s)
- Paweł Hyjek
- Institute of Technology, Pedagogical University of Krakow, Podchorążych 2 str., 30-084 Krakow, Poland; (I.S.); (P.M.); (K.B.)
- Correspondence:
| | - Iwona Sulima
- Institute of Technology, Pedagogical University of Krakow, Podchorążych 2 str., 30-084 Krakow, Poland; (I.S.); (P.M.); (K.B.)
| | - Piotr Malczewski
- Institute of Technology, Pedagogical University of Krakow, Podchorążych 2 str., 30-084 Krakow, Poland; (I.S.); (P.M.); (K.B.)
| | - Krzysztof Bryła
- Institute of Technology, Pedagogical University of Krakow, Podchorążych 2 str., 30-084 Krakow, Poland; (I.S.); (P.M.); (K.B.)
| | - Lucyna Jaworska
- Faculty of Non-Ferrous Metals, AGH University of Science and Technology, 30-059 Krakow, Poland;
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Lyczak P, Magdziak J, Galubiński A, Malczewski P. [Binswanger's disease--diagnostic criteria and analysis of cases]. Neurol Neurochir Pol 2001; 32 Suppl 6:117-20. [PMID: 11107574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
Binswanger's disease(BD) in an effect of a vascular destruction of deep white matter structures following multiple infarcts leading to disturbances of perception functions, recent memory and characterological disorders. BD is a disease occurring in late 6th decade of life. Computerized tomography and magnetic resonance imaging demonstrate foci of microinfarcts which coexist with arterial hypertension, atheromatous lesions and general cerebral atherosclerosis. BD leads to dementia, certain Parkinson-like signs, pyramidal system involvement, depression, organic brain damage syndrome, dysbasia and sphincter control loss. Ten patients observed by the author are reported.
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Affiliation(s)
- P Lyczak
- Oddziału Neurologii 7 Szpitala Marynarki Wojennej
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