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Liu Z, Couto R, Seifried B, Yépez B, Moquin P, Temelli F. Supercritical adsorptive precipitation of coenzyme Q10 on sodium alginate aerogel. J Supercrit Fluids 2022. [DOI: 10.1016/j.supflu.2022.105701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Liu Z, Couto R, Seifried B, Yépez B, Moquin P, Temelli F. Drying of sodium alginate using Pressurized Gas eXpanded (PGX) liquid technology. J CO2 UTIL 2022. [DOI: 10.1016/j.jcou.2022.102006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Johnson KA, Muzzin N, Toufanian S, Slick RA, Lawlor MW, Seifried B, Moquin P, Latulippe D, Hoare T. Drug-impregnated, pressurized gas expanded liquid-processed alginate hydrogel scaffolds for accelerated burn wound healing. Acta Biomater 2020; 112:101-111. [PMID: 32522716 DOI: 10.1016/j.actbio.2020.06.006] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 05/31/2020] [Accepted: 06/02/2020] [Indexed: 11/19/2022]
Abstract
While the benefits of both hydrogels and drug delivery to enhance wound healing have been demonstrated, the highly hydrophilic nature of hydrogels creates challenges with respect to the effective loading and delivery of hydrophobic drugs beneficial to wound healing. Herein, we utilize pressurized gas expanded liquid (PGX) technology to produce very high surface area (~200 m2/g) alginate scaffolds and describe a method for loading the scaffolds with ibuprofen (via adsorptive precipitation) and crosslinking them (via calcium chelation) to create a hydrogel suitable for wound treatment and hydrophobic drug delivery. The high surface area of the PGX-processed alginate scaffold facilitates >8 wt% loading of ibuprofen into the scaffold and controlled in vitro ibuprofen release over 12-24 h. In vivo burn wound healing assays demonstrate significantly accelerated healing with ibuprofen-loaded PGX-alginate/calcium scaffolds relative to both hydrogel-only and untreated controls, demonstrating the combined benefits of ibuprofen delivery to suppress inflammation as well as the capacity of the PGX-alginate/calcium hydrogel to maintain wound hydration and facilitate continuous calcium release to the wound. The use of PGX technology to produce highly porous scaffolds with increased surface areas, followed by adsorptive precipitation of a hydrophobic drug onto the scaffolds, offers a highly scalable method of creating medicated wound dressings with high drug loadings. STATEMENT OF SIGNIFICANCE: While medicated hydrogel-based wound dressings offer clear advantages in accelerating wound healing, the inherent incompatibility between conventional hydrogels and many poorly water-soluble drugs of relevance in wound healing remains a challenge. Herein, we leveraged supercritical fluids-based strategies to both process and subsequently impregnate alginate, followed by post-crosslinking to form a hydrogel, to create a very high surface area alginate hydrogel scaffold loaded with high hydrophobic drug contents (here, >8 wt% ibuprofen) without the need for any pore-forming additives. The impregnated scaffolds significantly accelerated burn wound healing while also promoting regeneration of the native skin morphology. We anticipate this approach can be leveraged to load clinically-relevant and highly bioavailable dosages of hydrophobic drugs in hydrogels for a broad range of potential applications.
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Affiliation(s)
- Kelli-Anne Johnson
- Department of Chemical Engineering, McMaster University, 1280 Main St. W., Hamilton, ON, Canada
| | - Nicola Muzzin
- Department of Chemical Engineering, McMaster University, 1280 Main St. W., Hamilton, ON, Canada
| | - Samaneh Toufanian
- Department of Chemical Engineering, McMaster University, 1280 Main St. W., Hamilton, ON, Canada
| | - Rebecca A Slick
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Michael W Lawlor
- Department of Pathology and Laboratory Medicine and Neuroscience Research Center, Medical College of Wisconsin, Milwaukee, WI, USA
| | | | - Paul Moquin
- Ceapro, Inc., 7824-51 Avenue NW, Edmonton, AB, Canada
| | - David Latulippe
- Department of Chemical Engineering, McMaster University, 1280 Main St. W., Hamilton, ON, Canada
| | - Todd Hoare
- Department of Chemical Engineering, McMaster University, 1280 Main St. W., Hamilton, ON, Canada.
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Couto R, Wong E, Seifried B, Yépez B, Moquin P, Temelli F. Preparation of PGX-dried gum arabic and its loading with coQ10 by adsorptive precipitation. J Supercrit Fluids 2020. [DOI: 10.1016/j.supflu.2019.104662] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Liu N, Couto R, Seifried B, Moquin P, Delgado L, Temelli F. Characterization of oat beta-glucan and coenzyme Q10-loaded beta-glucan powders generated by the pressurized gas-expanded liquid (PGX) technology. Food Res Int 2017; 106:354-362. [PMID: 29579935 DOI: 10.1016/j.foodres.2017.12.073] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 12/22/2017] [Accepted: 12/26/2017] [Indexed: 01/05/2023]
Abstract
The physicochemical properties of the oat beta-glucan powder (BG) and coenzyme Q10 (CoQ10)-loaded BG powder (L-BG) produced by the pressurized gas-expanded liquid (PGX) technology were studied. Helium ion microscope, differential scanning calorimeter, X-ray diffractometer, AutoSorb iQ and rheometer were used to determine the particle morphology, thermal properties, crystallinity, surface area and viscosity, respectively. Both BG (7.7μm) and L-BG (6.1μm) were produced as micrometer-scale particles, while CoQ10 nanoparticles (92nm) were adsorbed on the porous structure of L-BG. CoQ10 was successfully loaded onto BG using the PGX process via adsorptive precipitation mainly in its amorphous form. Viscosity of BG and L-BG solutions (0.15%, 0.2%, 0.3% w/v) displayed Newtonian behavior with increasing shear rate but decreased with temperature. Detailed characterization of the physicochemical properties of combination ingredients like L-BG will lead to the development of novel functional food and natural health product applications.
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Affiliation(s)
- Nian Liu
- Department of Agricultural, Food & Nutritional Science, University of Alberta, Edmonton, Alberta T6G 2P5, Canada
| | - Ricardo Couto
- Department of Agricultural, Food & Nutritional Science, University of Alberta, Edmonton, Alberta T6G 2P5, Canada
| | | | - Paul Moquin
- Ceapro Inc., 7824 - 51 Avenue, Edmonton, Alberta T6E 6W2, Canada
| | - Luis Delgado
- Ceapro Inc., 7824 - 51 Avenue, Edmonton, Alberta T6E 6W2, Canada
| | - Feral Temelli
- Department of Agricultural, Food & Nutritional Science, University of Alberta, Edmonton, Alberta T6G 2P5, Canada.
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Seifried B, Temelli F. Use and limitations of a quartz crystal microbalance to measure viscosity of carbon dioxide-expanded fish oil fatty acid ethyl esters. J Supercrit Fluids 2015. [DOI: 10.1016/j.supflu.2015.03.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Abstract
The design of a reciprocating dual action piston pump capable of circulating viscous fluids at pressures of up to 34 MPa (5000 psi) and temperatures up to 80 degrees C is described. The piston of this pump is driven by a pair of solenoids energized alternatively by a 12 V direct current power supply controlled by an electronic controller facilitating continuously adjustable flow rates. The body of this seal-less pump is constructed using off-the-shelf parts eliminating the need for custom made parts. Both the electronic controller and the pump can be assembled relatively easily. Pump performance has been evaluated at room temperature (22 degrees C) and atmospheric pressure using liquids with low and moderately high viscosities, such as ethanol and corn oil, respectively. At ambient conditions, the pump delivered continuous flow of ethanol and corn oil at a flow rate of up to 170 and 17 cm3/min, respectively. For pumping viscous fluids comparable to corn oil, an optimum reciprocation frequency was ascertained to maximize flow rate. For low viscosity liquids such as ethanol, a linear relationship between the flow rate and reciprocation frequency was determined up to the maximum reciprocation frequency of the pump. Since its fabrication, the pump has been used in our laboratory for circulating triglycerides in contact with supercritical carbon dioxide at pressures of up to 25 MPa (3600 psi) and temperatures up to 70 degrees C on a daily basis for a total of more than 1500 h of operation functioning trouble free.
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Affiliation(s)
- Bernhard Seifried
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta T6G 2P5, Canada
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Saar B, Gschossmann JM, Seifried B, Netzer P, Vock P. 3 Tesla-MR-Bildgebung: Ist die Bright-Lumen MR-Kolographie mit der Dark-Lumen MR-Kolographie vergleichbar? ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-976963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Navon R, Seifried B, Gal-On NS, Sadeh M. A new point mutation affecting the fourth transmembrane domain of PMP22 results in severe de novo Charcot-Marie-Tooth disease. Hum Genet 1996; 97:685-7. [PMID: 8655153 DOI: 10.1007/bf02281883] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
A novel T-->G mutation in exon 4 of the PMP22 gene was identified heterozygously in a girl with severe, de novo CMT1A disease. Duplication of the chromosomal 17p11-12 region, encompassing the PMP22 gene, was ruled out. This is the only known mutation that specifically affects the human fourth transmembrane (TM) domain of PMP22. It results in a substitution of a non-polar amino acid by a polar one (Leu147-->Arg), similar to the nearby Gly150-->Asp substitution, underlying the severe Trembler phenotype in the mouse. These mutations suggest that the fourth TM domain plays a crucial role in the normal function of PMP22. The new mutation also augments previous observations that diseases caused by mutations in PMP22 are more severe than those caused by the duplication of 17p11-12.
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Affiliation(s)
- R Navon
- Department of Human Genetics, Sackler School of Medicine, Tel Aviv University, Israel
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Neumann Y, Toren A, Rechavi G, Seifried B, Shoham NG, Mandel M, Kenet G, Sharon N, Sadeh M, Navon R. Vincristine treatment triggering the expression of asymptomatic Charcot-Marie-Tooth disease. Med Pediatr Oncol 1996; 26:280-3. [PMID: 8600343 DOI: 10.1002/(sici)1096-911x(199604)26:4<280::aid-mpo12>3.0.co;2-j] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
A 16-year-old male suffering from Ewing's sarcoma of the pelvis was treated with vincristine as part of his chemotherapeutic protocol. The boy was never known to suffer from any neurological problems. His father had a mild limp, attributed to prolonged "taxi driving," that was never investigated medically. The first course of treatment, which included 2 mg of vincristine, resulted in clinical improvement. However, at the same time the patient developed severe weakness of both upper and lower limbs, areflexia, and gradually a pes cavus deformity. Nerve conduction studies were suggestive of severe peripheral sensorimotor neuropathy, axonal and demyelinative. A definite diagnosis of Charcot-Marie-Tooth was confirmed by molecular analysis showing the typical duplication of 1.5 megabases at 17 p11.2. This unique manifestation of vincristine neurotoxicity is reported and discussed.
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Affiliation(s)
- Y Neumann
- Institute of Hematology, Chain Sheba Medical Center, Tel-Hashomer, Israel
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