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Kung DCN, Moon J, Kang H, Kang SW. Enhancing CA-based separators with thermo-responsive ionic liquids: A path to eco-friendly membrane production and multifaceted applications. Carbohydr Polym 2024; 337:122185. [PMID: 38710563 DOI: 10.1016/j.carbpol.2024.122185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 11/15/2023] [Revised: 04/15/2024] [Accepted: 04/17/2024] [Indexed: 05/08/2024]
Abstract
We synthesized a temperature-responsive ionic liquid, [N4444][SS], and incorporated it into an environmentally friendly cellulose acetate (CA)-based battery separator. A pore was formed in the battery separator by [N4444][SS], which pierced a plasticized part due to water pressure. Varying drying temperatures during membrane fabrication revealed that the CA/[N4444][SS] membrane dried at 50 °C exhibited greater thickness and a smaller average pore size, resulting in an asymmetric internal structure. Despite the asymmetry, this membrane demonstrated significantly higher water flux and a lower Gurley value compared to the membrane dried at 25 °C, indicating minimal tortuosity and low resistance within the internal pores. Thermal behavior analysis through TGA and DSC, as well as FT-IR spectroscopy, confirmed that [N4444][SS] remains within the CA matrix, forming coordinative bonds. The findings suggest that the CA/[N4444][SS] membrane, when used as a Li-ion battery separator, could enhance Li-ion transport properties and conductivity. Moreover, the recyclability of the IL in the membrane fabrication process contributes to a more environmentally friendly approach.
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Affiliation(s)
- Do Chun Nam Kung
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Republic of Korea
| | - Jihyeon Moon
- BK-21 Four Graduate Program, Department of Chemical Engineering, Dong-A University, Busan 49315, Republic of Korea
| | - Hyo Kang
- BK-21 Four Graduate Program, Department of Chemical Engineering, Dong-A University, Busan 49315, Republic of Korea.
| | - Sang Wook Kang
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Republic of Korea.
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2
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Kang SW, Ban JY, Park MS. Protective Role of Rapamycin in Fibrotic Liver Ischemia/Reperfusion Injury (C57bl/6 Mouse). Transplant Proc 2024; 56:672-677. [PMID: 38555195 DOI: 10.1016/j.transproceed.2024.03.005] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 03/13/2024] [Accepted: 03/13/2024] [Indexed: 04/02/2024]
Abstract
BACKGROUND Liver ischemia/reperfusion injury (IRI) is a well-documented phenomenon that occurs after liver resection and transplantation, posing a significant clinical challenge. We aim to contribute valuable insights into potential therapeutic interventions for fibrotic liver IRI, ultimately advancing our understanding of liver transplantation and resection outcomes. METHODS Twenty-four mice were divided randomly into 4 equal groups: [1] the normal group, n = 6; [2] the liver fibrosis (LF) group, n = 6; [3] the LF and IR group, n = 6; and [4] the LF with treatment of rapamycin and IR group; n = 6. RESULTS Key biomarkers assessing liver function, alanine aminotransferase and aspartate aminotransferase, significantly decreased with Rapamycin administration. There is a substantial decrease observed in inflammatory cytokines such as interleukin (IL) 6, IL-1B, tumor necrosis factor alpha, Transforming growth factor-beta (TGF-beta), and Inducible nitric oxide synthase (iNOS) with rapamycin treatment. Furthermore, NOX levels, caspase-3, and caspase-9 were reduced after rapamycin administration. CONCLUSION The application of rapamycin demonstrates appropriate effects in anti-inflammation, antioxidation, and anti-apoptosis, indicating significant therapeutic potential for fibrotic liver IRI.
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Affiliation(s)
- Sang Wook Kang
- Department of Oral Pathology, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea.
| | - Ju Yeon Ban
- Department of Dental Pharmacology, College of Dentistry, Dankook University, Cheonan, Republic of Korea.
| | - Min Su Park
- Department of Surgery, School of Medicine, Kyung Hee University, Seoul, Republic of Korea.
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Herr L, Ye JR, Kang SW, Ro ST, Chae YK, Lee KE, Kim MS, Jih MK, Lee C, Choi SC, Nam OH. Effect of intra-alveolar delivery of Frondoside A on inflammatory response of delayed tooth replantation. Dent Traumatol 2024; 40:178-186. [PMID: 37731288 DOI: 10.1111/edt.12891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 09/07/2023] [Accepted: 09/07/2023] [Indexed: 09/22/2023]
Abstract
BACKGROUND/AIM Frondoside A is a sea cucumber extract which is well known for its anti-inflammatory and immunomodulatory properties. The purpose of this study was to evaluate the effect of Frondoside A application in the alveolar socket on inflammatory responses after delayed replantation in rat teeth. MATERIALS AND METHODS Human periodontal ligament cells were cultured and exposed to Frondoside A. Cell-counting kit-8 assay was performed to evaluate the cell viability and nitric oxide assay was performed to assess the anti-inflammatory effect of Frondoside A. Molars were extracted from 32 Sprague-Dawley rats and randomly divided into control and Frondoside A groups. After 30 min of extra-oral dry time, molars were replanted. In the Frondoside A group, Frondoside A solution was applied in the alveolar socket before replantation. The animals were sacrificed after 28 days and histologically and immunohistochemically evaluated. RESULTS 0.5 μM Frondoside A showed higher cellular viability at 6 h and lower production of nitric oxide compared with other Frondoside A solutions (p < .05). The Frondoside A group demonstrated lower inflammatory resorption scores in both middle 1/3 and apical 1/3 of root compared to the control group (p < .05). The Frondoside A group showed lower levels of expression in both cathepsin K and CD45 compared with the control group (p < .05). CONCLUSIONS Within the limits of this study, intra-alveolar delivery of Frondoside A alleviates inflammatory root resorption in delayed replantation of rat teeth.
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Affiliation(s)
- Lar Herr
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, South Korea
| | - Ju Ri Ye
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, South Korea
| | - Sang Wook Kang
- Department of Oral and Maxillofacial Pathology, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - Sang Tae Ro
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, South Korea
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, South Korea
| | - Yong Kwon Chae
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, South Korea
| | - Ko Eun Lee
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, South Korea
| | - Mi Sun Kim
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - Myeong Kwan Jih
- Department of Pediatric Dentistry, School of Dentistry, Chosun University, Gwangju, South Korea
| | - Chunui Lee
- Department of Oral and Maxillofacial Surgery, Wonju College of Medicine, Yonsei University, Wonju, South Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, South Korea
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, South Korea
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea
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Lee C, Kang SW. Influence of citric acid concentrations on the porosity and performance of cellulose acetate-based porous membranes: A comprehensive study. Int J Biol Macromol 2024; 263:130243. [PMID: 38378111 DOI: 10.1016/j.ijbiomac.2024.130243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 12/26/2023] [Revised: 02/08/2024] [Accepted: 02/14/2024] [Indexed: 02/22/2024]
Abstract
This study investigates the influence of citric acid concentration on the fabrication of porous cellulose acetate (CA) membranes using the Non-Solvent Induced Phase Separation (NIPS) method. A notable aspect is the precise control over membrane properties, particularly pore size and porosity, achieved solely through the adjustment of citric acid concentration, serving as the additive. Higher concentrations of citric acid increase pore size by rendering polymer chains more pliable, whereas lower concentrations lead to smaller, denser pores due to improved dispersion in the CA matrix and altered water interactions during phase separation. A decrease in porosity and Gurley values with reducing citric acid concentrations (from 5 × 10-2 to 1 × 10-3 M ratios) indicates less plasticization of CA chains. However, at very low concentrations (1 × 10-4 and 1 × 10-5), porosity increases, despite the presence of smaller pores, and Gurley values approach those of pure CA in terms of gas permeability. Fourier Transform Infrared (FT-IR) spectroscopy confirms the presence of citric acid and its interaction with carbonyl groups, consistent with the pore size observations from Scanning Electron Microscopy (SEM). Spectral data deconvolution reveals weakened carbonyl bonds due to the reduced presence of citric acid, correlating with the smaller pores observed in SEM. Thermal Gravimetric Analysis (TGA) demonstrates that composite membranes are more thermally stable than pure CA, attributed to the citric acid-induced crosslinking within the polymer chains. Stability increases with decreasing citric acid concentration, with some anomalies at the lowest levels. In conclusion, this study highlights the capability of adjusting citric acid concentration to tailor membrane properties, offering valuable insights for the creation of porous materials across diverse industrial applications.
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Affiliation(s)
- Chaeyeon Lee
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Republic of Korea
| | - Sang Wook Kang
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Republic of Korea.
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Lee C, Kang SW. Derivation of porous cellulose propionate using hydrated hydroxyl groups and hydraulic pressure. Int J Biol Macromol 2024; 262:130240. [PMID: 38368993 DOI: 10.1016/j.ijbiomac.2024.130240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 04/26/2023] [Revised: 01/09/2024] [Accepted: 02/14/2024] [Indexed: 02/20/2024]
Abstract
This study aimed to enhance the thermal stability of microporous separators by introducing cellulose propionate (CP) as an innovative polymer matrix material, supplemented with glycerin as an additive. CP/glycerin composite membranes were created using hydraulic pressure techniques to reinforce essential separator properties. SEM analysis unveiled interconnected pores crucial for efficient ion transport, initiating water flux measurements at 5 bar. These measurements showcased improved mechanical strength, resulting in a porosity of 74.1 %. FT-IR spectroscopy illustrated CP-glycerin interactions, inducing plasticization and facilitating pore formation. Thermal Gravimetric Analysis (TGA) demonstrated superior thermal stability in CP/glycerin composite membranes compared to cellulose acetate (CA). Differential Scanning Calorimetry (DSC) revealed a slight reduction in thermal stability within a specific temperature range due to glycerin-induced plasticization effects. Nonetheless, the melting temperature (Tm) of CP/glycerin membranes increased to 188.4 °C, indicating heightened stability at elevated temperatures. Despite pressure-induced pore formation, CP/glycerin membranes exhibited enhanced thermal stability, suggesting reinforced molecular interactions. Overall, this study introduces a novel CP/glycerin composite membrane featuring improved thermal stability, enhanced strength, and controlled pore structures essential for efficient lithium-ion battery applications.
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Affiliation(s)
- Chaeyeon Lee
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Republic of Korea
| | - Sang Wook Kang
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Republic of Korea.
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Lee JH, Lee KE, Kang SW, Park SH, Chae YK, Lee MH, Kweon DK, Choi SC, Nam OH. Effect of orodispersible hyaluronic acid film on palatal mucosa wound healing. Oral Dis 2024; 30:518-527. [PMID: 36691707 DOI: 10.1111/odi.14517] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 12/23/2022] [Accepted: 01/20/2023] [Indexed: 01/25/2023]
Abstract
OBJECTIVE The objective of the study was to evaluate the healing effect of hyaluronic acid films on palatal wounds. MATERIALS AND METHODS After making 5-mm diameter palatal wounds, 72 rats were randomly assigned to three groups: control, hyaluronic acid gel, and hyaluronic acid film. The animals were sacrificed at 3, 7, and 21 days after the experiment. Clinical, histological, and RT-PCR analyses were performed. Human ex vivo oral mucosa models were used. Histological analysis and pan-cytokeratin staining were performed at 5 days after wound creation. RESULTS In rat model, both gels and films showed favorable healing on Days 3 and 7 compared with healing in the control (p < 0.05). Film showed remarkable VEGF and α-SMA expression than did the others (p < 0.05). Immunohistochemical analysis showed that film exhibited significantly lower CD68 and greater α-SMA and vimentin expression levels than those in the others (p < 0.05). In human model, re-epithelialization rate of film group was significantly higher than that of the others. Complete epithelial regeneration was confirmed only in film group using pan-cytokeratin staining. CONCLUSIONS Within the limits of this study, hyaluronic acid film outperformed gels in terms of palatal wound healing in both models.
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Affiliation(s)
- Jeong Hyun Lee
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, South Korea
| | - Ko Eun Lee
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee University Medical Center, Seoul, South Korea
| | - Sang Wook Kang
- Department of Oral and Maxillofacial Pathology, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - Seung Hwan Park
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, South Korea
| | - Yong Kwon Chae
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, South Korea
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee University Medical Center, Seoul, South Korea
| | | | | | - Sung Chul Choi
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee University Medical Center, Seoul, South Korea
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee University Medical Center, Seoul, South Korea
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea
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Lee S, Byun S, Kang SW. Mass transport to generate the channels in cellulose polymers by vacuum-assisted process. Int J Biol Macromol 2024; 259:128337. [PMID: 38000616 DOI: 10.1016/j.ijbiomac.2023.128337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 07/07/2023] [Revised: 10/09/2023] [Accepted: 11/14/2023] [Indexed: 11/26/2023]
Abstract
This study developed a pore-connected PP-CA membrane by coating cellulose acetate onto a polypropylene filter. A new method was proposed to attach a CA/glycerin coating layer to a porous PP support without a separate binder. The pores of CA and PP were interconnected using a vacuum filtration device. By adding glycerin to the CA chains, the membrane region became more flexible due to glycerin plasticization. Water passed through the membrane under pressure differences, resulting in the formation of interconnected pores between cellulose acetate and polypropylene. The pore size and quantity could be adjusted by varying the molar ratio of glycerin. Fourier transform infrared spectroscopy revealed the interaction between CA and glycerin, while thermogravimetric analysis showed that the membrane's thermal stability increased by approximately 20 °C after vacuum filtration. This simple and cost-effective manufacturing process holds potential for mass-producing separators in the lithium-ion battery industry.
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Affiliation(s)
- Sojeong Lee
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Republic of Korea
| | - Sunghyun Byun
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Republic of Korea
| | - Sang Wook Kang
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Republic of Korea.
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Lee C, Lee S, Kang SW. Enhanced porous membrane fabrication using cellulose acetate and citric acid: Improved structural integrity, thermal stability, and gas permeability. Carbohydr Polym 2024; 324:121571. [PMID: 37985069 DOI: 10.1016/j.carbpol.2023.121571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 09/24/2023] [Revised: 11/03/2023] [Accepted: 11/05/2023] [Indexed: 11/22/2023]
Abstract
In this study, our primary objective was to enhance the properties of porous membranes by addressing the limitations associated with phase separation. We employed a non-solvent induced phase separation (NIPS) method, utilizing cellulose acetate (CA) in conjunction with citric acid to fabricate these membranes. Citric acid played a dual role: ensuring a uniform pore structure and cross-linking the CA polymer, thereby enhancing its mechanical strength. This approach resulted in the development of a more robust membrane with superior structural integrity. Thermogravimetric analysis (TGA) confirmed enhanced thermal stability, particularly up to 150 °C, as a result of citric acid's cross-linking effect. Beyond 150 °C, the decomposition temperatures of the CA/citric acid membrane were found to be comparable to those of pure CA. Remarkably, a CA/citric acid ratio of 1:0.05 exhibited the slowest decomposition rate as the temperature increased. Scanning electron microscopy (SEM) examination unveiled a sponge-like membrane structure with numerous evenly distributed fine pores. Through the use of citric acid as a plasticizer, we were able to effectively control the penetration of water molecules, preventing the formation of macrovoids and promoting the creation of fine pores. This resulted in the fabrication of a high-porosity membrane, boasting an impressive porosity measurement of 84.9 %. Furthermore, measurements of the Gurley value confirmed efficient gas permeation, a critical characteristic for applications requiring effective gas transport. Fourier transform infrared (FT-IR) spectroscopy attested to the presence of citric acid in the membrane post-phase separation, indicating its successful integration. Our work presents a novel approach to enhance porous membranes, providing improvements in mechanical strength, thermal stability, and gas permeability. These findings offer valuable insights for the development of advanced materials with diverse applications in various fields.
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Affiliation(s)
- Chaeyeon Lee
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Republic of Korea
| | - Sojeong Lee
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Republic of Korea
| | - Sang Wook Kang
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Republic of Korea.
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Byun S, Cho Y, Kang SW. Channels formation in cellulose materials by accelerated transport of gas molecules and glycerin. Int J Biol Macromol 2024; 254:127823. [PMID: 37949285 DOI: 10.1016/j.ijbiomac.2023.127823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 09/04/2023] [Revised: 10/05/2023] [Accepted: 10/21/2023] [Indexed: 11/12/2023]
Abstract
In this study, a microporous separator was produced using cellulose acetate (CA), which demonstrates heightened thermal stability in comparison to existing materials like polypropylene (PP) or polyethylene (PE). Furthermore, a pliable component was integrated into the CA membrane using glycerin as the plasticizing agent. Subsequently, gas pressure was exerted onto these areas to induce the formation of nano-sized pores. Examination through Scanning Electron Microscopy (SEM) unveiled the presence of abundant pores in the glycerin-plasticized areas. This substantiates that the pores generated under gas pressure were not only more uniform but also smaller than those created under water pressure. The interaction between CA and glycerin was validated using Fourier-Transform Infrared Spectroscopy (FT-IR), offering confirmation that a portion of the glycerin was extracted following the application of gas pressure. Additionally, the application of Thermogravimetric Analysis (TGA) allowed for an assessment of the thermal stability of the CA membrane, along with a verification of glycerin's removal post gas pressure treatment. The findings indicated that the incorporation of glycerin diminished the thermal stability of the CA membrane due to the plasticization effect. Furthermore, it was observed that a minor quantity of glycerin still persisted after the gas pressure treatment. Following the analysis of gas permeation, the porosity of the CA membrane was quantified at 78.8 %, exhibiting an average pore size measuring 224 nm.
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Affiliation(s)
- Sunghyun Byun
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Republic of Korea
| | - Younghyun Cho
- Department of Energy Systems Engineering, Soonchunhyang University, Asan 31538, Republic of Korea.
| | - Sang Wook Kang
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Republic of Korea.
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Byun S, Kang SW. Gas transport into cellulose materials for highly porous structure. Carbohydr Polym 2023; 321:121301. [PMID: 37739504 DOI: 10.1016/j.carbpol.2023.121301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 04/05/2023] [Revised: 08/11/2023] [Accepted: 08/14/2023] [Indexed: 09/24/2023]
Abstract
To solve the low thermal stability of polyolefin membranes, our group developed porous polymers using cellulose acetate (CA) material. The formation of pores in CA involved creating plasticized regions within the CA membrane using additives. By applying gas pressure to these regions, a CA/glycolic acid membrane could be prepared with a small average pore size and high porosity. According to the porosimeter measurement, the average pore size of the membrane was 150 nm, and the porosity was 77%. SEM observations of the surface and cross-section of the CA/glycolic acid membrane confirmed the abundant distribution of fine pores. Furthermore, IR analysis revealed the removal of glycolic acid from the membrane after pore formation, indicating its interaction with CA during the process of gas permeation. Additionally, TGA analysis demonstrated a decrease in thermal stability due to the formation of numerous pores after gas permeation.
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Affiliation(s)
- Sunghyun Byun
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Republic of Korea
| | - Sang Wook Kang
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Republic of Korea.
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Stein H, Kang SW, Heo SY, Rheinwald M. Remote-access thyroidectomy with the da Vinci SP system: feasibility in a cadaveric model. Front Surg 2023; 10:1196021. [PMID: 37396295 PMCID: PMC10308308 DOI: 10.3389/fsurg.2023.1196021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Accepted: 05/31/2023] [Indexed: 07/04/2023] Open
Abstract
Background This study aims to study the feasibility of a remote-access thyroidectomy through presternal and submental approaches with the da Vinci SP system. Methods Bilateral thyroidectomies were performed in five cadaveric models. A single incision in the presternal area was used in two cadavers, and a submental facelift incision approach was used in three cadavers. Results Performing remote-access thyroidectomy was completed with a presternal approach in one cadaver and with the submental approach in three cadavers. The required skin flap development was minimal, and the docking time for the SP system was quick for all procedures. Time to full exposure of the thyroid gland after skin incision was less than 30 min for the presternal approach and less than 27 min for the submental procedure. Completing total thyroidectomies took 83 min in the presternal approach and between 67 and 127 min in the submental access. No additional ports were required to expose the gland and complete the bilateral resection. Conclusions Total thyroidectomy was feasible with the da Vinci SP system in single incision presternal and submental approaches comparing promisingly with other currently applied robotic methods. Further studies will be required to assess whether a presternal or submental thyroidectomy with the da Vinci SP system provides clinical benefits in real patients.
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Affiliation(s)
- Hubert Stein
- Department of Surgical Applications Engineering, Intuitive Surgical Inc., Sunnyvale, CA, United States
| | - Sang Wook Kang
- Department of Surgery, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Seung Young Heo
- Department of Surgical Applications Engineering, Intuitive Surgical Inc., Sunnyvale, CA, United States
| | - Markus Rheinwald
- Department of Surgical Applications Engineering, Intuitive Surgical Inc., Sunnyvale, CA, United States
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Jung YS, Ro ST, Kang SW, Lee H, Lee JS, Chae YK, Lee KE, Lee HS, Kwack KH, Kim SK, Choi SC, Nam OH. Bisphenol A release from commercially available 3-dimensionally printed resins and human cell apoptosis to bisphenol A: an in-vitro study. J Clin Pediatr Dent 2023; 47:89-95. [PMID: 37143426 DOI: 10.22514/jocpd.2023.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Accepted: 02/13/2023] [Indexed: 05/06/2023] Open
Abstract
Bisphenol A (BPA) from dental materials may be linked to children's health issues. This study aimed to assess the release of BPA from commercially available 3-dimensional (3D)-printed resin materials and evaluate BPA-related apoptotic effects on human periodontal ligament cells and gingival fibroblasts. Commercially available 3D-printed resin materials for prosthodontic use were selected as follows: NextDent C&B MFH (3D Systems, Rock Hill, SC, USA), DIOnavi-P. MAX (Dio Co., Busan, Korea), and DIOnavi-Denture02 (Dio Co., Busan, Korea). Identical cuboidal samples (1 cm × 1 cm × 0.5 cm) were printed from the materials and cured. BPA release was assessed using liquid chromatography/mass spectrometry (LC/MS). In addition, human gingival fibroblasts and periodontal ligament cells were exposed to various BPA solutions based on the LC/MS results. Cell Counting kit-8 (CCK-8) and real-time polymerase chain reaction analyses were performed to evaluate BPA-related apoptotic effects. The LC/MS analysis confirmed that none of the 3D-printed resin materials released BPA after curing. Both human gingival fibroblasts and periodontal ligament cells showed lower viability after BPA exposure. Regarding apoptosis-related gene expression, Caspase10 (CASP10) expression in periodontal ligament cells was significantly different in the BPA solutions (p < 0.05). The expression of BAX and Capspase8 (CASP8) in gingival fibroblasts was significantly increased by BPA in a dose-dependent manner (p < 0.05). Within the limitations of this study, the 3D-printed resin materials were not found to release BPA. This finding implies that 3D-printed resin materials are not associated with potential BPA-related risks in children.
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Affiliation(s)
- Yun Sun Jung
- Department of Pediatric Dentistry, Kyung Hee University, College of Dentistry, Kyung Hee University Medical Center, 02447 Seoul, Republic of Korea
- Department of Dentistry, Graduate School, Kyung Hee University, 02447 Seoul, Republic of Korea
| | - Sang Tae Ro
- Department of Pediatric Dentistry, Kyung Hee University, College of Dentistry, Kyung Hee University Medical Center, 02447 Seoul, Republic of Korea
- Department of Dentistry, Graduate School, Kyung Hee University, 02447 Seoul, Republic of Korea
| | - Sang Wook Kang
- Department of Oral and Maxillofacial Pathology, School of Dentistry, Kyung Hee University, 02447 Seoul, Republic of Korea
| | - Hyeonjong Lee
- Department of Prosthodontics, Dental College, Yonsei University, 03722 Seoul, Republic of Korea
| | - Jang Sun Lee
- Dio Implant Ortho Research & Design Center, 48058 Busan, Republic of Korea
| | - Yong Kwon Chae
- Department of Pediatric Dentistry, Kyung Hee University, College of Dentistry, Kyung Hee University Medical Center, 02447 Seoul, Republic of Korea
- Department of Dentistry, Graduate School, Kyung Hee University, 02447 Seoul, Republic of Korea
| | - Ko Eun Lee
- Department of Pediatric Dentistry, Kyung Hee University, College of Dentistry, Kyung Hee University Medical Center, 02447 Seoul, Republic of Korea
| | - Hyo-Seol Lee
- Department of Pediatric Dentistry, Kyung Hee University, College of Dentistry, Kyung Hee University Medical Center, 02447 Seoul, Republic of Korea
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, 02447 Seoul, Republic of Korea
| | - Kyu Hwan Kwack
- Department of Oral Microbiology, College of Dentistry, Kyung Hee University, 02447 Seoul, Republic of Korea
| | - Su Kang Kim
- Department of Biomedical Laboratory Science, Catholic Kwandong University, 25601 Gangneung, Republic of Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, Kyung Hee University, College of Dentistry, Kyung Hee University Medical Center, 02447 Seoul, Republic of Korea
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, 02447 Seoul, Republic of Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, Kyung Hee University, College of Dentistry, Kyung Hee University Medical Center, 02447 Seoul, Republic of Korea
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, 02447 Seoul, Republic of Korea
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Lee H, Nam Kung DC, Kang SW. Preparation of Porous Hydroxyethyl Cellulose Materials to Utilize Lactic Acid with Vacuum-Assisted Process. Molecules 2023; 28:molecules28093702. [PMID: 37175114 PMCID: PMC10180418 DOI: 10.3390/molecules28093702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 04/21/2023] [Accepted: 04/21/2023] [Indexed: 05/15/2023] Open
Abstract
For the first time, we succeeded in manufacturing a 2-hydroxyethyl cellulose (HEC)-based composite membrane with improved thermal stability, for use as a battery separator, coating a HEC polymer solution to a polypropylene (PP) support and using a vacuum-assisted process. A HEC polymer solution was prepared by utilizing HEC and lactic acid (LA) as a plasticizer. A vacuum-assisted process was used to move ethanol, which a mobile phase to permeate a plasticized region in the HEC polymer side for pore formation. The pores formed with uniform nano sizes, and areas in which some large pores formed were observed. The thermal stability of the composites was measured using TGA. The thermal decomposition temperatures were measured at about 250 °C for the neat HEC, about 210 °C for the HEC/LA film, and about 335 °C for the HEC/LA/PP membrane before the process. After the vacuum-assisted process, the first and second thermal decomposition were observed at about 360 °C and 450 °C, respectively. The HEC/LA/PP membrane after the process showed greater thermal stability than before the process. This means that the adhesion between the HEC polymer and the PP support was created through the rearrangement of the HEC chain, as LA escaped after the process, and it was seen indirectly that the mechanical strength was enhanced. In particular, the surface of the membrane was observed by SEM to investigate whether the HEC penetrated into the PP to block its pores, and whether the HEC region collapsed. Furthermore, the interaction of the HEC chain with the additives and the rearrangement of the HEC was confirmed using FT-IR. As a result, we demonstrated that the mechanical strength and thermal stability of the manufactured HEC/LA/PP membrane were enhanced.
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Affiliation(s)
- Haeun Lee
- Department of Electrical Engineering, Sangmyung University, Seoul 03016, Republic of Korea
| | - Do Chun Nam Kung
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Republic of Korea
| | - Sang Wook Kang
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Republic of Korea
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Heo GY, Kim HJ, Kalantar D, Jung CY, Kim HW, Park JT, Chang TI, Yoo TH, Kang SW, Rhee CM, Kalantar-Zadeh K, Han SH. Association between Fiber Intake and Risk of Incident Chronic Kidney Disease: The UK Biobank Study. J Nutr Health Aging 2023; 27:1018-1027. [PMID: 37997724 DOI: 10.1007/s12603-023-1998-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 07/15/2023] [Accepted: 09/13/2023] [Indexed: 11/25/2023]
Abstract
OBJECTIVES Dietary fiber intake is associated with a lower risk of diabetes, cardiovascular disease, and cancer. However, it is unknown whether dietary fiber has a beneficial effect on preventing the development of chronic kidney disease (CKD). DESIGN, SETTING, PARTICIPANTS AND MEASUREMENTS Using the UK Biobank prospective cohort, 110,412 participants who completed at least one dietary questionnaire and had an estimated glomerular filtration rate ≥60 mL/min/1.73 m2, urinary albumin-to-creatinine ratio <30 mg/g, and no history of CKD were included. The primary exposure was total dietary fiber density, calculated by dividing the absolute amount of daily total fiber intake by total energy intake (g/1,000 kcal). We separately examined soluble and insoluble fiber densities as additional predictors. The primary outcome was incident CKD based on diagnosis codes. RESULTS A total of 3,507 (3.2%) participants developed incident CKD during a median follow-up of 9.9 years. In a multivariable cause-specific model, the adjusted hazard ratios (aHRs; 95% confidence intervals [CIs]) for incident CKD were 0.85 (0.77-0.94), 0.78 (0.70-0.86), and 0.76 (0.68-0.86), respectively, for the second, third, and highest quartiles of dietary fiber density (reference: lowest quartile). In a continuous model, the aHR for each +∆1.0g/1,000 kcal increase in dietary fiber density was 0.97 (95% CI, 0.95-0.99). This pattern of associations was similar for both soluble and insoluble fiber densities and did not differ across subgroups of sex, age, body mass index, hypertension, diabetes, smoking, and inflammation. CONCLUSION Increased fiber intake was associated with a lower risk of CKD in this large well-characterized cohort.
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Affiliation(s)
- G Y Heo
- Seung Hyeok Han, MD, Ph.D. Yonsei University, Institute of Kidney Disease Research, College of Medicine, Department of Internal Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea, Phone: 82-2-2228-1984; Fax: 82-2-393-6884; E-mail: , (https://orcid.org/0000-0001-7923-5635)
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Lee J, Sohn H, Kang SW. Surface of CuO Nanoparticles Modified by p-Benzoquinone for N 2-Selective Membrane. Membranes (Basel) 2022; 12:1229. [PMID: 36557136 PMCID: PMC9787012 DOI: 10.3390/membranes12121229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 12/01/2022] [Accepted: 12/01/2022] [Indexed: 06/17/2023]
Abstract
In this study, CuO nanoparticles and p-benzoquinone (p-BQ) were added to a polyvinylpyrrolidone (PVP) matrix to increase N2/CO2 selectivity. The added p-BQ allowed CuO to be distributed in a uniform size in the PVP/CuO composite membrane and the matrix to be flexible by forming the interaction with PVP. The surface modification of CuO by p-BQ and the well-dispersed size affected the increase in the separation performance. The PVP/CuO/p-BQ composite membranes showed an N2/CO2 selectivity of about 23.1 with N2 permeance of about 13.3 GPU, while the separation performance of PVP was not observed. The enhanced separation performance is attributable to the surface of CuO nanoparticles modified by p-BQ inducing CO2 molecules to be relatively slowly transported by the adsorption properties in the polymer matrix. The chemical properties and coordinative interaction for PVP/CuO/p-BQ composite membrane were measured by FT-IR spectroscopy, thermogravimetric analysis, UV-vis, scanning electron microscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy.
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Affiliation(s)
- Juyeong Lee
- Department of Chemical Engineering and Materials Science, Sangmyung University, Seoul 03016, Republic of Korea
| | - Hiesang Sohn
- Department of Chemical Engineering, Kwangwoon University, Seoul 01897, Republic of Korea
| | - Sang Wook Kang
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Republic of Korea
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Chun Nam Kung D, Wook Kang S. Porous C2H3O2-substituted cellulose with thermal stability based on sodium chloride. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2022.10.055] [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: 11/06/2022]
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Kim BJ, Kang SW. Composites of poly(vinyl pyrrolidone) and polarized Ag nanoparticles for CO2 separation. KOREAN J CHEM ENG 2022. [DOI: 10.1007/s11814-022-1179-z] [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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Kim M, Cho Y, Kang SW. Interactions of Ag Particles Stabilized by 7,7,8,8-Tetracyanoquinodimethane with Olefin Molecules in Poly(ether-block-amide). Molecules 2022; 27:molecules27134122. [PMID: 35807368 PMCID: PMC9268640 DOI: 10.3390/molecules27134122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 06/23/2022] [Accepted: 06/23/2022] [Indexed: 11/16/2022] Open
Abstract
In this study, to use a stabilized carrier, silver nanoparticles (AgNPs) were used as carriers and electron acceptors were added to activate the surface of AgNPs as olefin carriers. In addition, poly(ether-block-amide) (PEBAX), consisting of polyamide (hard segments) and polyether (soft segments), was investigated for the correlation of the between-segments ratio related to the stability of AgNPs and separation performance. As a result, contrary to the expectation that high permeance would be observed in PEBAX-1657/AgNPs/7,7,8,8-tetracyanoquinodimethane (TCNQ) membrane, which had a higher ratio of polyether soft segment, the PEBAX-5513/AgNPs/TCNQ membrane, which had a relatively high proportion of polyamide, showed a higher permeance without difference in selectivity. These unexpected data were attributable to the fact that the relatively abundant amount of PA groups in PEBAX-5513 was able to stabilize and positively polarize the surface of AgNPs, resulting in the stabilized and high performance of olefin separation.
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Affiliation(s)
- Minsu Kim
- Department of Chemistry, Sangmyung University, Seoul 03016, Korea;
| | - Younghyun Cho
- Department of Energy Systems Engineering, Soonchunhyang University, Asan 31538, Korea
- Correspondence: (Y.C.); (S.W.K.); Tel.: +82-22-287-5362 (S.W.K.)
| | - Sang Wook Kang
- Department of Chemistry, Sangmyung University, Seoul 03016, Korea;
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Korea
- Correspondence: (Y.C.); (S.W.K.); Tel.: +82-22-287-5362 (S.W.K.)
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Kim Y, Choi M, Heo J, Jung S, Ka D, Lee H, Kang SW, Jung H, Lee S, Jin Y, Hong J. Blocking chemical warfare agent simulants by graphene oxide/polymer multilayer membrane based on hydrogen bonding and size sieving effect. J Hazard Mater 2022; 427:127884. [PMID: 34863570 DOI: 10.1016/j.jhazmat.2021.127884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 11/08/2021] [Accepted: 11/20/2021] [Indexed: 06/13/2023]
Abstract
Chemical warfare agents (CWAs) are toxic materials that cause death by contact with the skin or by respiration. Although studies on detoxification of CWAs have been intensively conducted, studies that block CWAs permeation are rare. In this study, for blocking CWAs, a multilayer thin film composed of linear polyethylenimine (LPEI) and graphene oxide (GO) is simply prepared through a spray-assisted Layer-by-Layer (LbL) assembly process. LPEI could change its morphology dependent on pH, which is known as a representative hydrogen donor and acceptor. By controlling the shape of the polymer chain, a heterogenous film could have a loose or dense inner structure. CWAs mainly move through diffusion and have hydrogen bonding sites. Therefore, the heterogeneous film can limit CWAs movement based on controlling pathways and hydrogen bonds within the film. The protective effect of this membrane is investigated using dimethyl methylphosphonate (DMMP), a nerve gas simulant. DMMP vapor transmittance rate (DVTR) and N2 permeance of LPEI/GO are 67.91 g/m2 day and 34,293.04 GPU. It means that the protection efficiency is 72.65%. Although this membrane has a thin thickness (100 nm), it shows a high protective effect with good breathability. And water/DMMP selectivity of the membrane is 66.63. Since this multilayer membrane shows efficient protection performance with a simple preparation method, it has a high potential for applications such as protective suits and masks.
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Affiliation(s)
- Youna Kim
- Department of Chemical and Biomolecular Engineering, College of Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Moonhyun Choi
- Department of Chemical and Biomolecular Engineering, College of Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Jiwoong Heo
- Department of Chemical and Biomolecular Engineering, College of Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Sungwon Jung
- Department of Chemical and Biomolecular Engineering, College of Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Dongwon Ka
- Chem-Bio Technology Center, Agency for Defense Development, Daejeon, 34186, Republic of Korea
| | - Hyeji Lee
- Department of Chemistry, Sangmyung University, 20 Hongjimun 2-gil, Jongno-gu, Seoul 03016, Republic of Korea
| | - Sang Wook Kang
- Department of Chemistry, Sangmyung University, 20 Hongjimun 2-gil, Jongno-gu, Seoul 03016, Republic of Korea
| | - Heesoo Jung
- Chem-Bio Technology Center, Agency for Defense Development, Daejeon, 34186, Republic of Korea
| | - Sangmin Lee
- School of Mechanical Engineering, Chung-ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea.
| | - Youngho Jin
- Chem-Bio Technology Center, Agency for Defense Development, Daejeon, 34186, Republic of Korea.
| | - Jinkee Hong
- Department of Chemical and Biomolecular Engineering, College of Engineering, Yonsei University, Seoul 03722, Republic of Korea.
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Kwon TG, Jun Kim B, Hyeon Jo O, Kang BG, Wook Kang S. Synthesis of surface-tuned polyacrylonitrile particles and its applications to CO2 separation. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2022.01.039] [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: 11/25/2022]
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Kim SH, Kang SW. Thermally stable and highly porous separator based on cellulose acetate by glycolic acid. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.124592] [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: 11/30/2022]
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22
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Hong SH, Cho Y, Kang SW. Formation of Water-Channel by Propylene Glycol into Polymer for Porous Materials. Membranes (Basel) 2021; 11:881. [PMID: 34832110 PMCID: PMC8623885 DOI: 10.3390/membranes11110881] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 11/02/2021] [Accepted: 11/08/2021] [Indexed: 11/16/2022]
Abstract
In this study, a porous membrane with a cellulose acetate (CA) matrix was fabricated using propylene glycol with a water pressure treatment without a metal salt as an additive. The water pressure treatment of the fabricated CA membrane with propylene glycol yielded nanopores. The nanopores were formed as the additives in the CA chains led to plasticization. The weakened chains of the parts where the plasticization occurred were broken by the water pressure, which generated the pores. Compared to the previous study with glycerin as an additive, the size of the hydration region was controlled by the number of hydrophilic functional groups. When water pressure was applied to the CA membrane containing propylene glycol as an additive, the hydration area was small, so it was effective to control the pore size and the number of nano pores than glycerin. In addition, the number of nanopores and pore size could be easily adjusted by the water pressure. The porosity of the membrane was increased owing to the trace amount of propylene glycol, confirmed by scanning electron microscopy (SEM) and porosimetry. The interaction between the CA and propylene glycol was verified by Fourier-transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). Consequently, it was the optimum composition to generate pores at the CA/propylene glycol 1:0.2 ratio, and porosity of 69.7% and average pore diameter of 300 nm was confirmed. Since it is a membrane with high porosity and nano sized pores, it is expected to be applied in various fields.
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Affiliation(s)
- Seong Ho Hong
- Department of Chemistry, Sangmyung University, Seoul 03016, Korea;
| | - Younghyun Cho
- Department of Energy Systems Engineering, Soonchunhyang University, Asan 31538, Korea
| | - Sang Wook Kang
- Department of Chemistry, Sangmyung University, Seoul 03016, Korea;
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Korea
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Kim SH, Kang SW. Interconnected channels through polypropylene and cellulose acetate by utilizing lactic acid for stable separators. Chem Commun (Camb) 2021; 57:8965-8968. [PMID: 34486585 DOI: 10.1039/d1cc02955j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
In this study, an eco-friendly and inexpensive cellulose acetate (CA) separator was fabricated and a method of making a single film by combining a polypropylene (PP) film and cellulose was proposed. The CA solution was coated on the PP film with a doctor blade and water treatment was applied to the bonded polymer to create interconnected pores and completely bond the CA onto the PP. In addition, lactic acid was added to CA to induce a plasticizing effect for abundant pore formation. The binding was confirmed using FT-IR and SEM, and the pore size generated from the CA side was found to be less than 1 μm on average. TGA was used to measure the thermal stability of the connected polymers.
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Affiliation(s)
- So Hee Kim
- Department of Chemistry, Sangmyung University, Seoul 03016, Republic of Korea.
| | - Sang Wook Kang
- Department of Chemistry, Sangmyung University, Seoul 03016, Republic of Korea. .,Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Republic of Korea
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Abstract
In this study, cellulose acetate (CA) and calcium oxide was used to manufacture an CA-CaO separator with high thermal stability and was then coated on polypropylene (PP). The high melting point of CaO and the complexation of CaO and carbonyl groups in CA increased the thermal stability of CA. Because PP is known to have a higher mechanical stability than CA, the CA-CaO separator was coated twice on the PP support, increasing the stability of the entire separator. Adhesion was imparted between the CA film and the PP film without a separate adhesive due to the swelling effect of the solvent and the water pressure treatment, and pores were even formed by the pressure. Water flux data showed that cellulose acetate containing CaO coated on polypropylene (CA-CaO on PP) obtained a relatively high flux value of 71.67 L m-2 h-1 (LMH) at a pressure of 8 bar. Through thermogravimetric analysis and Fourier transform infrared data, it was confirmed that the surfaces of two polymers were bonded and the stability was improved.
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Affiliation(s)
- Hye Ji Lee
- Department of Chemistry, Sangmyung University, Seoul 03016, Republic of Korea.
| | - Sang Wook Kang
- Department of Chemistry, Sangmyung University, Seoul 03016, Republic of Korea. and Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Republic of Korea.
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Rhyu SY, Cho Y, Kang SW. Processes to enhance the sensitivity of sensor for 2‐n‐octyl‐4‐isothiazolin‐3‐one as biocide. AIChE J 2021. [DOI: 10.1002/aic.17224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Seung Yeon Rhyu
- Department of Chemistry Sangmyung University Seoul Republic of Korea
| | - Younghyun Cho
- Department of Energy Systems Engineering Soonchunhyang University Asan Republic of Korea
| | - Sang Wook Kang
- Department of Chemistry Sangmyung University Seoul Republic of Korea
- Department of Chemistry and Energy Engineering Sangmyung University Seoul Republic of Korea
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Chae YK, Shin SY, Kang SW, Choi SC, Nam OH. Differential gene expression profiles of periodontal soft tissue from rat teeth after immediate and delayed replantation: a pilot study. J Periodontal Implant Sci 2021; 52:127-140. [PMID: 35505574 PMCID: PMC9064781 DOI: 10.5051/jpis.2104300215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Revised: 09/27/2021] [Accepted: 11/03/2021] [Indexed: 11/18/2022] Open
Abstract
Purpose In dental avulsion, delayed replantation usually has an uncertain prognosis. After tooth replantation, complex inflammatory responses promote a return to periodontal tissue homeostasis. Various types of cytokines are produced in the inflammatory microenvironment, and these cytokines determine the periodontal tissue response. This study aimed to identify the gene expression profiles of replanted teeth and evaluate the functional differences between immediate and delayed replantation. Methods Maxillary molars from Sprague-Dawley rats were extracted, exposed to a dry environment, and then replanted. The animals were divided into 2 groups according to the extra-oral time: immediate replantation (dry for 5 minutes) and delayed replantation (dry for 60 minutes). Either 3 or 7 days after replantation, the animals were sacrificed. Periodontal soft tissues were harvested for mRNA sequencing. Hallmark gene set enrichment analysis was performed to predict the function of gene-gene interactions. The normalized enrichment score (NES) was calculated to determine functional differences. Results The hallmark gene sets enriched in delayed replantation at 3 days were oxidative phosphorylation (NES=2.82, Q<0.001) and tumor necrosis factor-alpha (TNF-α) signaling via the nuclear factor kappa light chain enhancer of activated B cells (NF-κB) pathway (NES=1.52, Q=0.034). At 7 days after delayed replantation, TNF-α signaling via the NF-κB pathway (NES=–1.82, Q=0.002), angiogenesis (NES=–1.66, Q=0.01), and the transforming growth factor-beta signaling pathway (NES=–1.46, Q=0.051) were negatively highlighted. Conclusions Differentially expressed gene profiles were significantly different between immediate and delayed replantation. TNF-α signaling via the NF-κB pathway was marked during the healing process. However, the enrichment score of this pathway changed in a time-dependent manner between immediate and delayed replantation.
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Affiliation(s)
- Yong Kwon Chae
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, Korea
| | - Seo Young Shin
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, Korea
| | - Sang Wook Kang
- Department of Oral and Maxillofacial Pathology, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
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Park KR, Leem HH, Cho M, Kang SW, Yun HM. Effects of the amide alkaloid piperyline on apoptosis, autophagy, and differentiation of pre-osteoblasts. Phytomedicine 2020; 79:153347. [PMID: 32992084 DOI: 10.1016/j.phymed.2020.153347] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 08/26/2020] [Accepted: 09/17/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND Amide alkaloidsare typical constituents in plants of the Piperaceae family. Most of the pharmacological properties of Piper nigrum L. are attributed to the major amide alkaloid, piperine. Piperyline (PIPE) is a further amide alkaloid that has been isolated from P. nigrum. HYPOTHESIS/PURPOSE This study was performed to examine the biological effects of PIPE on pre-osteoblasts and elucidate the underlying mechanisms. STUDY DESIGN We investigated the effects of PIPE in MC3T3E-1 cells, which are widely used for studying osteoblast behavior in in vitro cell systems. METHODS We evaluated cell viability based on the MTT assay, apoptosis by TUNEL staining, adhesion and migration by cell adhesion and migration assays, and osteoblast differentiation by alkaline phosphatase activity and staining. Western blot and immunocytochemical analyses were used to investigate cell signaling pathways. RESULTS We found that at concentrations ranging from 1 to 30 μM, PIPE inhibited cell growth and induced apoptosis in pre-osteoblasts, which was accompanied by the upregulation of apoptotic proteins but downregulation of anti-apoptotic proteins. In contrast, PIPE had no appreciable effect on the autophagy pathway. Nevertheless, PIPE reduced cell adhesion and migration via the inactivation of non-receptor tyrosine kinase (Src)/focal adhesion kinase (FAK) and mitogen-activated protein kinases, and also promoted the downregulation of matrix metalloproteinase 2 and 9 levels. Furthermore, at concentrations of 10 and 30 μM, PIPE suppressed osteoblast differentiation, as indicated by reductions in alkaline phosphatase staining and activity. In addition, PIPE reduced the protein levels of phospho-Smad1/5/8 and runt-related transcription factor 2, and the mRNA levels of osteopontin, alkaline phosphatase, and osteocalcin. CONCLUSION The findings of this study indicate that PIPE has biological effects associated with cell adhesion, migration, proliferation, and osteoblast differentiation, and suggest a potential role for this alkaloid in the treatment of bone diseases.
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Affiliation(s)
- Kyung-Ran Park
- Department of Oral and Maxillofacial Pathology, School of Dentistry, Kyung HeeUniversity,26, Kyungheedae-ro, Dongdaemun-gu,Seoul02453, South Korea
| | - Hyun Hee Leem
- National Development Institute of Korean Medicine, Gyeongsan38540, South Korea
| | - MyoungLae Cho
- National Development Institute of Korean Medicine, Gyeongsan38540, South Korea
| | - Sang Wook Kang
- Department of Oral and Maxillofacial Pathology, School of Dentistry, Kyung HeeUniversity,26, Kyungheedae-ro, Dongdaemun-gu,Seoul02453, South Korea.
| | - Hyung-Mun Yun
- Department of Oral and Maxillofacial Pathology, School of Dentistry, Kyung HeeUniversity,26, Kyungheedae-ro, Dongdaemun-gu,Seoul02453, South Korea.
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Choi H, Kim KJ, Hong N, Shin S, Choi JR, Kang SW, Lee ST, Rhee Y. Genetic Analysis and Clinical Characteristics of Hereditary Pheochromocytoma and Paraganglioma Syndrome in Korean Population. Endocrinol Metab (Seoul) 2020; 35:858-872. [PMID: 33397040 PMCID: PMC7803615 DOI: 10.3803/enm.2020.683] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Accepted: 10/08/2020] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Pheochromocytoma and paragangliomas (PPGL) are hereditary in approximately 30% to 40% cases. With the advancement of genetic analysis techniques, including next-generation sequencing (NGS), there were attempts to classify PPGL into molecular clusters. With NGS being applied to clinical settings recently, we aimed to review the results of genetic analysis, including NGS, and investigate the association with clinical characteristics in Korean PPGL patients. METHODS We reviewed the medical records of PPGL patients who visited Severance hospital from 2006 to 2019. We documented the clinical phenotype of those who underwent targeted NGS or had known germline mutations of related genes. RESULTS Among 57 PPGL patients, we found 28 pathogenic germline mutations of susceptibility genes. Before the targeted NGS was implemented, only obvious syndromic feature lead to the Sanger sequencing for the specific genes. Therefore, for the exact prevalence, only patients after the year 2017, when targeted NGS was added, were included (n=43). The positive germline mutations were found in 14 patients; thus, the incidence rate is 32.6%. Patients with germline mutations had a higher likelihood of family history. There were significant differences in the type of PPGLs, percentage of family history, metastasis rate, presence of other tumors, and biochemical profile among three molecular clusters: pseudohypoxic tricarboxylic acid cycle-related, pseudohypoxic von Hippel-Lindau (VHL)/endothelial PAS domain-containing protein 1-related, and kinase-signaling group. Germline mutations were identified in seven PPGL-related genes (SDHB, RET, VHL, NF1, MAX, SDHA, and SDHD). CONCLUSION We report the expected prevalence of germline mutations in Korean PPGL patients. NGS is a useful and accessible tool for genetic analysis in patients with PPGLs, and further research on molecular classification is needed for precise management.
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Affiliation(s)
- Heewon Choi
- Yonsei University College of Medicine, Seoul,
Korea
| | - Kyoung Jin Kim
- Department of Internal Medicine, Severance Hospital, Endocrine Research Institute, Yonsei University College of Medicine, Seoul,
Korea
- Department of Internal Medicine, Korea University College of Medicine, Seoul,
Korea
| | - Namki Hong
- Department of Internal Medicine, Severance Hospital, Endocrine Research Institute, Yonsei University College of Medicine, Seoul,
Korea
| | - Saeam Shin
- Department of Laboratory Medicine, Yonsei University College of Medicine, Seoul,
Korea
| | - Jong-Rak Choi
- Department of Laboratory Medicine, Yonsei University College of Medicine, Seoul,
Korea
| | - Sang Wook Kang
- Thyroid-Endocrine Surgery Division, Department of Surgery, Yonsei University College of Medicine, Seoul,
Korea
| | - Seung Tae Lee
- Department of Laboratory Medicine, Yonsei University College of Medicine, Seoul,
Korea
| | - Yumie Rhee
- Department of Internal Medicine, Severance Hospital, Endocrine Research Institute, Yonsei University College of Medicine, Seoul,
Korea
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Hong SH, Kang SW. Preparation of a Cellulose Column for Enhancing the Sensing Efficiency of the Biocide 2-n-Octyl-4-Isothiazolin-3-One. Polymers (Basel) 2020; 12:E2712. [PMID: 33207816 PMCID: PMC7696371 DOI: 10.3390/polym12112712] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Revised: 11/07/2020] [Accepted: 11/11/2020] [Indexed: 11/17/2022] Open
Abstract
In this study, a cellulose acetate (CA) membrane with pores generated by a water pressure treatment was investigated for its ability to serve as a pretreatment filter device for the detection of 2-n-octyl-4-isothiazolin-3-one (OIT). Pores were generated by applying a water pressure of 8 bar to a membrane manufactured using a CA-based polymer solution. The CA used for the manufacturing was an environment-friendly, low-cost and highly energy-efficient material. Furthermore, since the fabricated porous CA polymeric film possessed many hydrophilic functional groups, it could strongly bind hydrophilic substances while avoiding interaction with hydrophobic substances. OIT, which comprises a hydrophobic bond that forms weak bonds over time, can break down more easily than hydrophilic impurities. The different extents of interaction occurring between either the toxic fungicide OIT or the hydrophilic impurities and the CA film were determined by Fourier-transform infrared (FT-IR) spectroscopy. The physicochemical changes in the resulting membrane, which occurred when the pores were generated, were investigated through scanning electron microscopy (SEM) and thermogravimetric analysis (TGA).
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Affiliation(s)
- Seong Ho Hong
- Department of Chemistry, Sangmyung University, Seoul 03016, Korea;
| | - Sang Wook Kang
- Department of Chemistry, Sangmyung University, Seoul 03016, Korea;
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Korea
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Nam OH, Lee HS, Kim JH, Chae YK, Hong SJ, Kang SW, Lee HS, Choi SC, Kim Y. Differential Gene Expression Changes in Human Primary Dental Pulp Cells Treated with Biodentine and TheraCal LC Compared to MTA. Biomedicines 2020; 8:biomedicines8110445. [PMID: 33105546 PMCID: PMC7690278 DOI: 10.3390/biomedicines8110445] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 10/16/2020] [Accepted: 10/20/2020] [Indexed: 12/14/2022] Open
Abstract
This study aimed to analyze the effects of pulp capping materials on gene expression changes in primary tooth-derived dental pulp cells using next-generation sequencing. Dental pulp cells were extracted and treated with mineral trioxide aggregate (MTA), Biodentine (BD), or TheraCal LC (TC). Cell viability assays were performed. Total RNA was extracted and analyzed through mRNA sequencing. Bioinformatic analysis of differential gene expression in dental pulp cells exposed to BD or TC versus MTA was performed. MTA, BD, and TC exposure had no significant effect on pulp cell viability (p > 0.05). Gene sets associated with inflammatory response (p = 2.94 × 10−5) and tumor necrosis factor alpha (TNF-α) signaling via the nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) pathway (p = 2.94 × 10−5) were enriched in all materials. In BD-treated cells, Wnt/β-catenin signaling (p = 3.15 × 10−4) gene sets were enriched, whereas enrichment of interferon gamma (IFN-γ) response (p = 3 × 10−3) was observed in TC-treated cells. In gene plot analysis, marked increases in receptor activator of nuclear factor kappa-Β ligand (RANKL) expression were seen in TC-treated cells over time. Despite the similar cell viabilities exhibited among MTA-, BD-, and TC-treated cells, patterns of gene networks differed, suggesting that diverse functional gene differences may be associated with treatment using these materials.
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Affiliation(s)
- Ok Hyung Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul 02447, Korea
| | - Ho Sun Lee
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul 02447, Korea
| | - Jae-Hwan Kim
- Department of Pediatric Dentistry, School of Dentistry, Jeonbuk National University, Jeonju 54896, Korea
| | - Yong Kwon Chae
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul 02447, Korea
| | - Seoung-Jin Hong
- Department of Prosthodontics, School of Dentistry, Kyung Hee University, Seoul 02447, Korea
| | - Sang Wook Kang
- Department of Oral and Maxillofacial Pathology, School of Dentistry, Kyung Hee University, Seoul 02447, Korea
| | - Hyo-Seol Lee
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul 02447, Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul 02447, Korea
| | - Young Kim
- Department of Oral Pathology, School of Dentistry, Chonnam National University, Gwangju 61186, Korea
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Kang SW. Enhanced Olefin Transport by SiO 2 Particles for Polymer/Ag Metal/Electron Acceptor Composite Membranes. Polymers (Basel) 2020; 12:polym12102316. [PMID: 33050490 PMCID: PMC7600099 DOI: 10.3390/polym12102316] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Revised: 10/06/2020] [Accepted: 10/08/2020] [Indexed: 11/16/2022] Open
Abstract
We showed the potential of poly(ethylene-co-propylene) (EPR)/silver metal/p-benzoquinone composite membranes for propylene/propane mixtures, i.e., a selectivity of 10 and a mixed gas permeance of 0.5 GPU (1 GPU = 1 × 10-6 cm3 (STP)/(cm2 s cmHg) in a previous study. In this study, we additionally found that the incorporation of fumed silica nanoparticles into EPR/silver metal/p-benzoquinone (p-BQ) composite membranes exhibited much higher permeance and selectivity for propylene/propane mixtures. The positive polarity of silver metal continuously increased with the increasing silica content up to the 0.1 weight ratio, as revealed by x-ray photoelectron spectroscopy (XPS). This increase in the polarity of silver metal was attributed to the enhanced interaction of p-BQ with the surface of Ag nanoparticles by the increased dispersion of p-BQ by fumed silica nanoparticles. Differential scanning calorimetry (DSC) also presented that the glass transition temperature (Tg) of the membranes was almost invariant. Therefore, the improvement of the permeance and selectivity with the silica nanoparticles was attributable to the increased polarity of the silver metal rather than the structural change.
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Affiliation(s)
- Sang Wook Kang
- Department of Chemistry, Sangmyung University, Seoul 03016, Korea; ; Tel.: +82-2-2287-5362
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Korea
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Hwang J, Lee HJ, Kang SW. Structural control of polysulfone membrane by using dimethylacetamide and water-pressure for water treatment. KOREAN J CHEM ENG 2020. [DOI: 10.1007/s11814-020-0558-6] [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: 11/29/2022]
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Kang SW. Long-Term Stable 1-butyl-3-methylimidazolium Hexafluorophosphate/Ag Metal Composite Membranes for Facilitated Olefin Transport. Membranes (Basel) 2020; 10:E191. [PMID: 32824769 PMCID: PMC7463454 DOI: 10.3390/membranes10080191] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 08/10/2020] [Accepted: 08/17/2020] [Indexed: 12/02/2022]
Abstract
For the preparation of long-term stable ionic liquid/Ag nanoparticles composites, we compared the separation performance of 1-butyl-3-methylimidazolium tetrafluoroborate (BMIM+BF4-)/Ag, and 1-butyl-3-methylimidazolium hexafluorophosphate (BMIM+PF6-)/Ag composite membranes with time. Separation performance showed that the BMIM+PF6-/Ag metal composite membrane was more stable than the BMIM+BF4-/Ag metal composite membrane for more than 160 h. These differences in long-term stability in BMIM+PF6-/Ag and BMIM+BF4-/Ag metal composite membranes was attributable to the phase separation between ionic liquid and nanoparticles. In particular, the phase separation between ionic liquid and silver nanoparticles was not observed with time in hydrophobic ionic liquid BMIM+PF6-, confirmed by X-ray photoelectron spectroscopy.
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Affiliation(s)
- Sang Wook Kang
- Department of Chemistry, Sangmyung University, Seoul 03016, Korea; ; Tel.: +82-2-2287-5362
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Korea
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Kim SY, Cho Y, Kang SW. Preparation and Characterization of PEBAX-5513/AgBF 4/BMIMBF 4 Membranes for Olefin/Paraffin Separation. Polymers (Basel) 2020; 12:E1550. [PMID: 32668771 PMCID: PMC7408108 DOI: 10.3390/polym12071550] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 07/03/2020] [Accepted: 07/09/2020] [Indexed: 11/16/2022] Open
Abstract
In this study, we investigated a poly(ether-block-amide)-5513 (PEBAX-5513)/AgBF4/1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4) composite membrane, which is expected to have a high stabilizing effect on the Ag+ ions functioning as olefin carriers in the amide group. Poly(ethylene oxide) (PEO) only consists of ether regions, whereas the PEBAX-5513 copolymer contains both ether and amide regions. However, given the brittle nature of the amide, the penetration of BMIMBF4 remains challenging. The nanoparticles did not stabilize after their formation in the long-term test, thereby resulting in a poor performance compared to previous experiments using PEO as the polymer (selectivity 3; permeance 12.3 GPU). The properties of the functional groups in the polymers were assessed using Fourier transform infrared spectroscopy, scanning electron microscopy, and thermogravimetric analysis, which confirmed that the properties endowed during the production of the film using the ionic liquid can impact the performance.
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Affiliation(s)
- So Young Kim
- Department of Chemistry, Sangmyung University, Seoul 03016, Korea;
| | - Younghyun Cho
- Department of Energy Systems Engineering, Soonchunhyang University, Asan 31538, Korea
| | - Sang Wook Kang
- Department of Chemistry, Sangmyung University, Seoul 03016, Korea;
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Korea
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Choi H, Hong N, Shin S, Lee ST, Choi JR, Kang SW, Rhee Y. MON-195 Genetic Analysis and Clinical Characteristics of Hereditary Paraganglioma and Pheochromocytoma Syndrome in Korean Population. J Endocr Soc 2020. [PMCID: PMC7209484 DOI: 10.1210/jendso/bvaa046.879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Pheochromocytoma (PCC) and paragangliomas (PGL), rare neuroendocrine tumor originating from the chromaffin cells together referred as PPGL, are acknowledged to be more than 40% hereditary, related to germline mutations of susceptibility gene. With the advancement of genetic analysis technique, including next-generation sequencing (NGS), there has been attempts to classify PPGL into molecular clusters - Pseudohypoxic, Wnt signaling, and Kinase signaling PPGL. With NGS being applied to clinical setting only recently in Korea, we aimed to review the result of genetic analysis, including NGS, and investigate its association with clinical characteristics in Korean PPGL patients. We reviewed medical records of patients with PPGL in Severance hospital enrolled between January of 2006 to October of 2019. We gathered clinical phenotype by reviewing medical records of the patients who underwent targeted NGS from March of 2017 to October of 2019 using Severance hospital’s endocrine panel or who had known germline mutations of related genes. Family gene analysis was recommended for family members of patients with significant gene mutations. Among 78 patients with PPGL, 58 patients underwent targeted NGS results or had prediagnosed mutations. Thirty-three patients (62.1%) had clinically significant germline mutation. In patients with hereditary PPGL, there were higher likelihood of family history and presence of other tumors. There were significant differences in the type of PPGLs, percentage of family history, metastasis rate and the presence of other tumors among 3 molecular clusters - pseudohypoxic TCA cycle-related, pseudohypoxic VHL/EPAS1-related and kinase-signaling group. Twenty-seven different germline mutations from 11 genes (SDHB, RET, VHL, EPAS1, NF1, KIF1B, MAX, SDHA, SDHC, SDHD, and TMEM127) were found, SDHB mutation being the most common. Four of them were novel mutations; EPAS1 c.1250G>A (p.Gly417Glu), NF1 c.6215delA (p.His2072LeufsTer10), NF1 c.6777del (p.Gly2260fs), and SDHC exon 2-6 duplication. In conclusion, we report the prevalence of germline mutations in Korean PPGL patients, and the rate of hereditary PPGL is estimated to be as high as 62.1%. NGS is a good and accessible tool for genetic analysis in patients with PPGLs, and further research on molecular classification will lead to precision medicine.
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Affiliation(s)
- Heewon Choi
- Yonsei University College of Medicine, Seoul, Korea, Republic of
| | - Namki Hong
- Department of Internal Medicine, Severance Hospital, Endocrine Research Institute, Yonsei University College of Medicine, Seoul, Korea, Republic of
| | - Saeam Shin
- Department of Laboratory Medicine, Yonsei University College of Medicine, Seoul, Korea, Republic of
| | - Seung Tae Lee
- Department of Laboratory Medicine, Yonsei University College of Medicine, Seoul, Korea, Republic of
| | - Jong Rak Choi
- Department of Laboratory Medicine, Yonsei University College of Medicine, Seoul, Korea, Republic of
| | - Sang Wook Kang
- Department of Surgery, Yonsei University College of Medicine, Seoul, Korea, Republic of
| | - Yumie Rhee
- Department of Internal Medicine, Severance Hospital, Endocrine Research Institute, Yonsei University College of Medicine, Seoul, Korea, Republic of
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Lee WG, Kang SW. Preparation and characterization of porous cellulose acetate with copper (II) nitrate additives for separator applications. KOREAN J CHEM ENG 2020. [DOI: 10.1007/s11814-020-0494-5] [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: 10/24/2022]
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Lee WG, Cho Y, Kang SW. Effect of Ionic Radius in Metal Nitrate on Pore Generation of Cellulose Acetate in Polymer Nanocomposite. Polymers (Basel) 2020; 12:polym12040981. [PMID: 32340116 PMCID: PMC7240385 DOI: 10.3390/polym12040981] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 04/20/2020] [Accepted: 04/21/2020] [Indexed: 01/17/2023] Open
Abstract
To prepare a porous cellulose acetate (CA) for application as a battery separator, Cd(NO3)2·4H2O was utilized with water-pressure as an external physical force. When the CA was complexed with Cd(NO3)2·4H2O and exposed to external water-pressure, the water-flux through the CA was observed, indicating the generation of pores in the polymer. Furthermore, as the hydraulic pressure increased, the water-flux increased proportionally, indicating the possibility of control for the porosity and pore size. Surprisingly, the value above 250 LMH (L/m2h) observed at the ratio of 1:0.35 (mole ratio of CA: Cd(NO3)2·4H2O) was of higher flux than those of CA/other metal nitrate salts (Ni(NO3)2 and Mg(NO3)2) complexes. The higher value indicated that the larger and abundant pores were generated in the cellulose acetate at the same water-pressure. Thus, it could be thought that the Cd(NO3)2·4H2O salt played a role as a stronger plasticizer than the other metal nitrate salts such as Ni(NO3)2 and Mg(NO3)2. These results were attributable to the fact that the atomic radius and ionic radius of the Cd were largest among the three elements, resulting in the relatively larger Cd of the Cd(NO3)2 that could easily be dissociated into cations and NO3- ions. As a result, the free NO3- ions could be readily hydrated with water molecules, causing the plasticization effect on the chains of cellulose acetate. The coordinative interactions between the CA and Cd(NO3)2·4H2O were investigated by IR spectroscopy. The change of ionic species in Cd(NO3)2·4H2O was analyzed by Raman spectroscopy.
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Affiliation(s)
- Woong Gi Lee
- Department of Chemistry, Sangmyung University, Seoul 03016, Korea;
| | - Younghyun Cho
- Department of Energy Systems Engineering, Soonchunhyang University, Asan 31538, Korea
- Correspondence: (Y.C.); (S.W.K.); Tel./Fax: +82-2-2287-5362 (S.W.K.)
| | - Sang Wook Kang
- Department of Chemistry, Sangmyung University, Seoul 03016, Korea;
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Korea
- Correspondence: (Y.C.); (S.W.K.); Tel./Fax: +82-2-2287-5362 (S.W.K.)
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Kim SY, Cho Y, Kang SW. Correlation between Functional Group and Formation of Nanoparticles in PEBAX/Ag Salt/Al Salt Complexes for Olefin Separation. Polymers (Basel) 2020; 12:polym12030667. [PMID: 32192086 PMCID: PMC7183082 DOI: 10.3390/polym12030667] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 03/05/2020] [Accepted: 03/07/2020] [Indexed: 11/16/2022] Open
Abstract
poly ether-block-amide (PEBAX)-2533/metal salt/Al salt membranes were prepared for mixed olefin/paraffin separation. PEBAX-2533 with 80% ether group and 20% amide group was suggested as the polymer matrix for comparison of separation performance according to the functional group ratio in copolymer PEBAX. In addition, Al salts were used to stabilize metal ions for a long time as additives. High permeance was expected with the proportion of high ether groups, since these functional groups provided relatively permeable regions. As a result, the PEBAX-2533 composite membrane showed a selectivity of 5 (propylene/propane) with 10 GPU. However, the permeance of membrane was not unexpectedly improved and the selectivity was reduced. The result was analyzed by using SEM, RAMAN and thermogravimetric analysis (TGA), including Fourier transform infrared (FTIR). The reduction in separation performance was determined by using FT-IR. Based on these results, in order to stabilize the metal ions interacting with the polymer through Al(NO3)3, it was concluded that a specific ratio of the amide group was needed in PEBAX as a polymer matrix.
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Affiliation(s)
- So Young Kim
- Department of Chemistry, Sangmyung University, Seoul 03016, Korea;
| | - Younghyun Cho
- Department of Energy Systems Engineering, Soonchunhyang University, Asan 31538, Korea
- Correspondence: (Y.C.); (S.W.K.); Tel.: +82-2-2287-5362 (S.W.K.)
| | - Sang Wook Kang
- Department of Chemistry, Sangmyung University, Seoul 03016, Korea;
- Department of Chemistry and Energy Engineering, Sangmyung University, Seoul 03016, Korea
- Correspondence: (Y.C.); (S.W.K.); Tel.: +82-2-2287-5362 (S.W.K.)
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Heo J, Choi M, Choi D, Jeong H, Kim HY, Jeon H, Kang SW, Hong J. Spray-assisted layer-by-layer self-assembly of tertiary-amine-stabilized gold nanoparticles and graphene oxide for efficient CO2 capture. J Memb Sci 2020. [DOI: 10.1016/j.memsci.2020.117905] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Amatya S, Shin Y, Ha JY, Lee SJ, Kang SW, Kwon B, Kim DH. Simultaneous determination of eight arginine-related metabolites in cellular extracts using liquid chromatography-tandem mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2020; 1137:121936. [PMID: 31891857 DOI: 10.1016/j.jchromb.2019.121936] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [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: 09/26/2019] [Revised: 11/27/2019] [Accepted: 12/06/2019] [Indexed: 10/25/2022]
Abstract
A simple, sensitive, and rapid liquid chromatography (LC)-tandem mass spectrometry (MS/MS) method was developed for the simultaneous determination of arginine and its pathway-related metabolites (ornithine, proline, citrulline, glutamate, agmatine, spermidine, and spermine) in cellular extracts. Cells were lysed and cellular proteins precipitated by the addition of acetonitrile followed by ultra-sonication. Supernatants were analyzed using a Chromolith High Resolution RP-18 endcapped column (100 × 4.6 mm, 1.15 μm, 150 Å), with mobile phases of 0.1% formic acid solution and 0.1% formic acid in acetonitrile. Detection was carried out in multiple reaction monitoring (MRM) mode. Calibration curves showed linearity (r2 > 0.99) for all metabolites over the calibration ranges used. The intra- and inter-day precision was less than 13.5%, and the accuracy was between 91.3 and 114.7%. The method developed in this study was successfully applied to measure arginine and its pathway-related metabolites, which are related to nitric oxide synthase/arginase pathways in mouse bone marrow-derived dendritic cells (BMDCs). The ability to simultaneously measure arginine and its pathway-related metabolites is valuable for better understanding local and systemic inflammatory processes.
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Affiliation(s)
- Sarmila Amatya
- Department of Pharmacology and PharmacoGenomics Research Center, Inje University College of Medicine, Busan, Republic of Korea
| | - Yumi Shin
- Department of Pharmacology and PharmacoGenomics Research Center, Inje University College of Medicine, Busan, Republic of Korea
| | - Jeong Yeop Ha
- Department of Pharmacology and PharmacoGenomics Research Center, Inje University College of Medicine, Busan, Republic of Korea
| | - Su-Jun Lee
- Department of Pharmacology and PharmacoGenomics Research Center, Inje University College of Medicine, Busan, Republic of Korea
| | - Sang Wook Kang
- Biomedical Research Center, Ulsan University Hospitial, University of Ulsan, Ulsan, Republic of Korea
| | - Byungsuk Kwon
- Biomedical Research Center, Ulsan University Hospitial, University of Ulsan, Ulsan, Republic of Korea; School of Biological Science, University of Ulsan, Ulsan, Republic of Korea
| | - Dong Hyun Kim
- Department of Pharmacology and PharmacoGenomics Research Center, Inje University College of Medicine, Busan, Republic of Korea.
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Jeon H, Cho Y, Kang SW. Structural Effect of Ionic Liquid on Long-Term Stability in Poly(ethylene oxide)/Ag Ions/Ag Nanoparticles Composite for Olefin Separation. Macromol Res 2019. [DOI: 10.1007/s13233-020-8057-5] [Citation(s) in RCA: 4] [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: 11/30/2022]
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Lee JH, Moon JH, Ryu JI, Kang SW, Kwack KH, Lee JY. Antibacterial effects of sodium tripolyphosphate against Porphyromonas species associated with periodontitis of companion animals. J Vet Sci 2019; 20:e33. [PMID: 31364318 PMCID: PMC6669212 DOI: 10.4142/jvs.2019.20.e33] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 06/16/2019] [Accepted: 06/24/2019] [Indexed: 12/20/2022] Open
Abstract
Porphyromonas species are closely associated with companion animal periodontitis which is one of the most common diseases in dogs and cats and leads to serious systemic diseases if left untreated. In this study, we evaluated the antimicrobial effects and mode of action of sodium tripolyphosphate (polyP3, Na5P3O10), a food additive with proven safety, using three pathogenic Porphyromonas species. The minimum inhibitory concentrations (MICs) of polyP3 against Porphyromonas gulae, Porphyromonas cansulci, and Porphyromonas cangingivalis were between 500 and 750 mg/L. PolyP3 significantly decreased viable planktonic cells as well as bacterial biofilm formation, even at sub-MIC concentrations. PolyP3 caused bacterial membrane disruption and this effect was most prominent in P. cangingivalis, which was demonstrated by measuring the amount of nucleotide leakage from the cells. To further investigate the mode of action of polyP3, high-throughput whole-transcriptome sequencing was performed using P. gulae. Approximately 30% of the total genes of P. gulae were differentially expressed by polyP3 (> 4-fold, adjusted p value < 0.01). PolyP3 influenced the expression of the P. gulae genes related to the biosynthesis of thiamine, ubiquinone, and peptidoglycan. Collectively, polyP3 has excellent antibacterial effects against pathogenic Porphyromonas species and can be a promising agent to control oral pathogenic bacteria in companion animals.
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Affiliation(s)
- Jae Hyung Lee
- Department of Maxillofacial Biomedical Engineering, School of Dentistry, Kyung Hee University, Seoul 02447, Korea.,Department of Life and Nanopharmaceutical Sciences, Kyung Hee University, Seoul 02447, Korea
| | - Ji Hoi Moon
- Department of Maxillofacial Biomedical Engineering, School of Dentistry, Kyung Hee University, Seoul 02447, Korea.,Department of Life and Nanopharmaceutical Sciences, Kyung Hee University, Seoul 02447, Korea.
| | - Jae In Ryu
- Department of Preventive Dentistry, School of Dentistry, Kyung Hee University, Seoul 02447, Korea
| | - Sang Wook Kang
- Department of Oral and Maxillofacial Pathology, School of Dentistry, Kyung Hee University, Seoul 02447, Korea
| | - Kyu Hwan Kwack
- Institute of Oral Biology, School of Dentistry, Kyung Hee University, Seoul 02447, Korea
| | - Jin Yong Lee
- Department of Maxillofacial Biomedical Engineering, School of Dentistry, Kyung Hee University, Seoul 02447, Korea.
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Kim HY, Kang SW. CO 2 separation using composites consisting of 1-butyl-3-methylimidazolium tetrafluoroborate/CdO/1-aminopyridinium iodide. Sci Rep 2019; 9:16563. [PMID: 31719556 PMCID: PMC6851388 DOI: 10.1038/s41598-019-53002-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Accepted: 10/26/2019] [Indexed: 11/09/2022] Open
Abstract
1-Aminopyridinium iodide (iodine salt) was used in CO2 separation composites consisting of CdO and 1-butyl-3-methylimidazolium tetrafluoroborate (BMIM+BF4−). Using iodine salt, the separation performance was largely improved. The CO2/N2 selectivity was 64.6 and the permeance of CO2 gas was 22.6 GPU, which was about twice that of BMIM+BF4−/CdO composites without addition of iodine salt. These results were due to the both effect of iodine salt on the transport of the N2 molecules by the cyclic ring compound and the promoting transport of CO2 molecules by the amine groups. Moreover, the oxide layer on the surface of the CdO could enhance the CO2 solubility, resulting in the enhancement of separation performance. The mechanical and chemical properties were measured using SEM, Raman, TGA and FT-IR. The cross-section of coated membranes was confirmed by SEM. The coordinative interactions of iodine salts with BMIM+BF4−/CdO composite were observed by Raman.
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Affiliation(s)
- Hyun Young Kim
- Department of Chemistry, Sangmyung University, Seoul, 03016, Republic of Korea
| | - Sang Wook Kang
- Department of Chemistry, Sangmyung University, Seoul, 03016, Republic of Korea. .,Department of Chemistry and Energy Engineering, Sangmyung University, Seoul, 03016, Republic of Korea.
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Kim SK, Kang SW, Jin SA, Ban JY, Hong SJ, Park MS. Protective Effect of Citric Acid Against Hepatic Ischemia Reperfusion Injury in Sprague-Dawley Rats. Transplant Proc 2019; 51:2823-2827. [PMID: 31493918 DOI: 10.1016/j.transproceed.2019.02.056] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 02/06/2019] [Indexed: 01/03/2023]
Abstract
OBJECTIVE Hepatic ischemia reperfusion (I/R) injury is regarded as a serious concern in clinical practice. Citric acid reduces oxidative stress and inflammation during hypoxia and reoxygenation. Our objective was to investigate the protective effect of citric acid against hepatic I/R injury in rats. METHODS We fed Sprague-Dawley rats either citric acid (100 mg/kg/d) or saline. One week later, ischemia was induced by clamping the rats' common hepatic artery and portal vein for 30 minutes. The rats were randomly divided into 3 major groups that were treated as follows: 1. the sham operated group; 2. the I/R group; and 3. the I/R-citric acid group. RESULTS Compared to the sham group, the I/R group had higher expression of aspartate aminotransferase and alanine aminotransferase and lower expression of catalase, superoxide dismutase, glutathione peroxidase, antioxidant, nitric oxide, and albumin. Compared to the I/R group, the I/R-citric acid group had higher expression of catalase, superoxide dismutase, antioxidants, and nitric oxide, and lower expression of aspartate aminotransferase and alanine aminotransferase. CONCLUSIONS These results suggest that citric acid therapy has significant therapeutic potential in ischemic liver injury.
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Affiliation(s)
- Su Kang Kim
- Department of Biomedical Laboratory Science, Catholic Kwandong University, Gangneung, Republic of Korea
| | - Sang Wook Kang
- Department of Dental Pharmacology, College of Dentistry, Dankook University, Cheonan, Republic of Korea
| | - Seul A Jin
- Department of Dental Pharmacology, College of Dentistry, Dankook University, Cheonan, Republic of Korea
| | - Ju Yeon Ban
- Department of Dental Pharmacology, College of Dentistry, Dankook University, Cheonan, Republic of Korea
| | - Seoung-Jin Hong
- Department of Prosthodontics, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
| | - Min-Su Park
- Department of Surgery, School of Medicine, Kyung Hee University, Seoul, Republic of Korea.
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Park HK, Kang SW, Park MS. Hesperidin Ameliorates Hepatic Ischemia-Reperfusion Injury in Sprague-Dawley Rats. Transplant Proc 2019; 51:2828-2832. [PMID: 31493917 DOI: 10.1016/j.transproceed.2019.02.059] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Accepted: 02/06/2019] [Indexed: 11/28/2022]
Abstract
OBJECTIVE Hepatic ischemia and reperfusion (I/R) is a destructive event associated with high rates of liver failure after liver transplantation. Hesperidin significantly contributes to the antioxidant defense system and has been reported to act as a powerful agent against superoxide and hydroxyl radicals. Our objective was to investigate the protective effect of hesperidin against hepatic IR injury in a rat model. METHODS We fed Sprague-Dawley rats either hesperidin (100 mg/kg/d) or saline. One week later, ischemia was induced by clamping the rats' common hepatic artery and portal vein for 30 minutes. The rats were divided into 3 groups: 1. the sham operated group; 2. the I/R group; and 3. the I/R-hesperidin group. RESULTS Compared to the sham group, the I/R group had higher expression of serum aspartate aminotransferase and serum alanine aminotransferase and lower expression of catalase, superoxide dismutase, glutathione peroxidase, antioxidant, nitric oxide, and albumin. Compared to the I/R group, the I/R-hesperidin group had higher expression of catalase, superoxide dismutase, antioxidant and nitric oxide and lower expression of serum aspartate aminotransferase and serum alanine aminotransferase. CONCLUSIONS Our findings suggest that hesperidin is a potential therapeutic agent for hepatic I/R injury.
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Affiliation(s)
- Hyun-Kyung Park
- Department of Emergency Medicine, Seoul Medical Center, Seoul, Republic of Korea
| | - Sang Wook Kang
- Department of Dental Pharmacology, College of Dentistry, Dankook University, Cheonan, Republic of Korea
| | - Min-Su Park
- Department of Surgery, School of Medicine, Kyung Hee University, Seoul, Republic of Korea.
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