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      • KCI등재

        Self-antibacterial chitosan/Aloe barbadensis Miller hydrogels releasing nitrite for biomedical applications

        Thai Thanh Hoang Thi,Binh D.T. Trinh,Phuong Le Thi,Dieu Linh Tran,박기동,Dai Hai Nguyen 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.103 No.-

        Because of the toxic glutaraldehyde, the chitosan-glutaraldehyde hydrogels are seriously limited inbiomedical applications. In this study, exploiting bioactive compounds of Aloe barbadensis Miller, the chitosan/Aloe barbadensis Miller-glutaraldehyde (CS/AV-GDA) hydrogels were fabricated with 4-fold lowerglutaraldehyde concentration without compromising hydrogel characteristics. The gelation time wascontrolled from a few seconds to several hours. The elastic modulus was varied from 483 to 99940 Pa. The CS/AV-GDA hydrogels could release the natural nitrite amount from 24.0 to 89.6 lM within the firsthour for antibacterial activity, then continuously deliver a few lM every next hour for cell activities. Theantibacterial test against Escherichia coli and Staphylococcus aureus revealed that the CS/AV-GDA hydrogelscould kill the planktonic bacteria 5-fold more highly than control and prevent bacteria attachmenton hydrogel surface effectively. Although the CS/AV-GDA hydrogels consumed only 0.25% glutaraldehydeconcentration, their antibacterial capacities were comparable to chitosan-only hydrogels with 2% glutaraldehyde. For cytotoxicity tests, the CS/AV-GDA hydrogels using 0.25% glutaraldehyde concentrationinduce the human dermal fibroblasts proliferation significantly. All CS/AV-GDA hydrogels with glutaraldehydecrosslinker less than 1% showed non-cytotoxicity. As a result, the new CS/AV-GDA hydrogelsmight become an attractive candidate for medicine regeneration and tissue engineering.

      • KCI등재

        Effects of Maleic Anhydride Grafted Ethylene/Vinyl Acetate Copolymer (EVA)on the Properties of EVA/Silica Nanocomposites

        Thai Hoang,Nguyen Thuy Chinh,Nguyen Thi Thu Trang,To Thi Xuan Hang,Dinh Thi Mai Thanh,Dang Viet Hung,하창식,Maëlenn Aufray 한국고분자학회 2013 Macromolecular Research Vol.21 No.11

        Ternary nanocomposites based on ethylene/vinyl acetate copolymer (EVA), maleic anhydride-grafted EVA (EVAgMA), and nanosilica were prepared in a Haake Rheomixer. The structure of the EVA/EVAgMA/silica nanocomposites was characterized by Fourier transform infrared spectroscopy and field emission scanning electron microscopy. The blending sequence was found to have a significant effect on the microstructure of EVA/EVAgMA/silica nanocomposites and the dispersion behavior of the nanosilica in the EVA matrix. The tensile properties (tensile strength and elongation at break), thermal behavior, crystalline structure and weatherability of the nanocomposites were also studied. The results showed that the above properties of the nanocomposites were enhanced remarkably using 1 wt% EVAgMA.

      • Engineered horseradish peroxidase-catalyzed hydrogels with high tissue adhesiveness for biomedical applications

        Hoang Thi, Thai Thanh,Lee, Yunki,Le Thi, Phuong,Park, Ki Dong Elsevier 2019 Journal of industrial and engineering chemistry Vol.78 No.-

        <P><B>Abstract</B></P> <P>Adhesive hydrogels offer considerable potential in biomedical applications because of the excellent integration between materials and tissues. Horseradish peroxidase (HRP)-catalyzed hydrogelation, with advantages that include ease of handling, simplicity in material design, high biocompatibility, and processability, is becoming a promising candidate to be engineered as an adhesive hydrogel. This review summarizes recent development of HRP-mediated hydrogelation towards the bioadhesive field, and other applications requiring the tissue adhesion of hydrogels. From the viewpoint of adhesive hydrogel designation, the basic chemistry of the adhesive mechanism, combinations of interactions, and currently commercial bioglues are summarized. The review recapitulated the adhesive hydrogel applications, the clinical translation ability, the controlling hydrogelation kinetics, the related physicochemical characteristics, cytotoxicity, and animal studies. Looking to the future, to make more substantial contributions to the bioadhesive field, or to various biomedical applications, higher adhesion should be continuously improved, and greater emphasis should be placed on clinical trials.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

      • SCIE

        Nitric oxide-releasing injectable hydrogels with high antibacterial activity through in situ formation of peroxynitrite

        Hoang Thi, Thai Thanh,Lee, Yunki,Le Thi, Phuong,Park, Ki Dong Elsevier 2018 ACTA BIOMATERIALIA Vol.67 No.-

        <P><B>Abstract</B></P> <P>Nitric oxide (NO) is an endogenous molecule with many critical biological functions that depend on its concentration. At high levels, NO provides broad-spectrum antibacterial effects through both its pathogen inhibition and killing abilities. However, its short half-life has been a great challenge to its clinical application in pharmaceutical forms. In this study, we incorporated the NO donor S-nitrosothiolated gelatin (GelSNO) into injectable gelatin-based hydrogels (GHs) to controllably release NO. Under catalysis by horseradish peroxidase, H<SUB>2</SUB>O<SUB>2</SUB> oxidizes phenol moieties functionalized on gelatin to quickly form phenol-phenol crosslinks that encapsulate GelSNO. Through thermal, visible light, and oxidizing agent-driven mechanisms, NO is released from the GH/GelSNO hydrogels. By varying the GelSNO concentration, the release of NO was controllable in a wide range, 0.054–2.050 μmol/mL, for up to 14 days. In addition, NO release was fine-tunable as a function of H<SUB>2</SUB>O<SUB>2</SUB> concentration. Notably, the in situ formation of peroxynitrite (ONOO<SUP>−</SUP>) that produces potent antibacterial effects originated from H<SUB>2</SUB>O<SUB>2</SUB> residues and nitrous acid formed by NO and oxygen in aqueous solution. The Kirby-Bauer method indicated that there was an inhibition zone against both <I>Escherichia coli</I> and <I>Staphylococcus aureus</I> incubated with GH/GelSNO hydrogels. The AlarmaBlue assay showed that <I>E. coli</I> and <I>S. aureus</I> were completely killed at NO concentrations of 0.39 and 0.58 μmol/mL. Cytotoxicity tests of GH/GelSNO hydrogels on human dermal fibroblasts at the indicated bactericidal NO concentrations induced no cell toxicity. In summary, GH/GelSNO hydrogels may provide a new platform for topical delivery of NO in treating wound infections and for various biomedical applications.</P> <P><B>Statement of Significance</B></P> <P>NO is an effective antibacterial agent even in cases of antibiotic-resistant bacteria. Moreover, its intermediate, peroxynitrite, has been reported to have a much higher ability to kill bacteria. In this study, we utilized injectable GH/GelSNO hydrogels formed by HRP/H<SUB>2</SUB>O<SUB>2</SUB> reaction not only to control NO release but also to generate peroxynitrite in situ from released NO and H<SUB>2</SUB>O<SUB>2</SUB> residues. The GH/GelSNO hydrogels showed significant antibacterial ability on both gram-positive and negative bacteria, while no cytotoxicity was induced on human dermal fibroblasts. In addition, their tunable chemico-physical properties and controllable NO release within a wide range but narrow scale will make the hydrogels useful in various biomedical applications.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

      • SCISCIESCOPUS

        Ambient Backscatter: A New Approach to Improve Network Performance for RF-Powered Cognitive Radio Networks

        Hoang, Dinh Thai,Niyato, Dusit,Wang, Ping,Kim, Dong In,Han, Zhu Institute of Electrical and Electronics Engineers 2017 IEEE transactions on communications Vol.65 No.9

        <P>This paper introduces a new solution to improve the performance for secondary systems in radio frequency (RF) powered cognitive radio networks (CRNs). In a conventional RF-powered CRN, the secondary system works based on the harvest-then-transmit protocol. That is, the secondary transmitter (ST) harvests energy from primary signals and then uses the harvested energy to transmit data to its secondary receiver (SR). However, with this protocol, the performance of the secondary system is much dependent on the amount of harvested energy as well as the primary channel activity, e.g., idle and busy periods. Recently, ambient backscatter communication has been introduced, which enables the ST to transmit data to the SR by backscattering ambient signals. Therefore, it is potential to be adopted in the RF-powered CRN. We investigate the performance of RF-powered CRNs with ambient backscatter communication over two scenarios, i.e., overlay and underlay CRNs. For each scenario, we formulate and solve the optimization problem to maximize the overall transmission rate of the secondary system. Numerical results show that by incorporating such two techniques, the performance of the secondary system can be improved significantly compared with the case when the ST performs either harvest-then-transmit or ambient backscatter technique.</P>

      • KCI등재

        Engineered horseradish peroxidase-catalyzed hydrogels with high tissue adhesiveness for biomedical applications

        Thai Thanh Hoang Thi,이윤기,Phuong Le Thi,박기동 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-

        Adhesive hydrogels offer considerable potential in biomedical applications because of the excellentintegration between materials and tissues. Horseradish peroxidase (HRP)-catalyzed hydrogelation, withadvantages that include ease of handling, simplicity in material design, high biocompatibility, andprocessability, is becoming a promising candidate to be engineered as an adhesive hydrogel. This reviewsummarizes recent development of HRP-mediated hydrogelation towards the bioadhesivefield, andother applications requiring the tissue adhesion of hydrogels. From the viewpoint of adhesive hydrogeldesignation, the basic chemistry of the adhesive mechanism, combinations of interactions, and currentlycommercial bioglues are summarized. The review recapitulated the adhesive hydrogel applications, theclinical translation ability, the controlling hydrogelation kinetics, the related physicochemicalcharacteristics, cytotoxicity, and animal studies. Looking to the future, to make more substantialcontributions to the bioadhesivefield, or to various biomedical applications, higher adhesion should becontinuously improved, and greater emphasis should be placed on clinical trials.

      • KCI등재

        Developing a Green Route Model for Dry Port Selection in Vietnam

        Hoang Thai Pham,이향숙 한국해운물류학회 2019 The Asian journal of shipping and Logistics Vol.35 No.2

        The dry port can smooth the movement of cargo and eliminate capacity pressure, natural restriction and externalities faced by seaports. A network of dry ports also can reduce the amount of pollution emitted from logistics activities by allowing the increasing share of environmentally friendly modes of transport. The paper suggests a green routing model for dry port selection to increases the percentage of using rail or inland waterway transportation in the journey through dry port, instead of road transportation. This model reduces the amount of emission from logistics activities, such as carbon dioxide (CO2), nitric oxides (NOx) and particulate matter (PM) with the minimum cost, considering both the emission charge and the shipping charge. A case study is conducted for Samsung Thai Nguyen factory in the North of Vietnam to validate the model application. The results indicate that the smallest total cost route saves up to 51% of CO2 and 36.5% of PM emission exhausted than unimodal road transportation. The research provides a useful guideline for new green transport policies of public agents as well as decision-making processes in private companies.

      • KCI등재

        Oxidized Alginate Supplemented Gelatin Hydrogels for the In Situ Formation of Wound Dressing with High Antibacterial Activity

        Thai Thanh Hoang Thi,이윤기,Phuong Le Thi,박기동 한국고분자학회 2019 Macromolecular Research Vol.27 No.8

        The development of antibacterial wound dressing with easily removable characteristic and highly exudate absorption is becoming a major requirement in the treatment of chronic wounds. In this study, the in situ forming gelatin/oxidized alginate-tyramine hydrogels (GH/OATA) were designed to overcome the current limitations. These hybrid hydrogels were quickly and controllably formed from several seconds to a few minutes by horseradish peroxidase/H2O2. The hybrid hydrogels at the optimal composition of GH/OATA 50/50 v/v showed the unique feature including stiffness being similar to skin, high swelling ratio due to the hydrophilic property of oxidized alginate, low adhesive strength allowing for the easy dressing removal without pain. In addition, the hybrid hydrogels could release the H2O2 amount sustainably to kill bacteria. Furthermore, 3D culture of human dermal fibroblasts inside hybrid hydrogels achieved more than 80% cell proliferation which implies the cell-compatibility.

      • Development of a Piano-Playing Robot with Motion-Sound Mapping

        Thai V. Hoang,박광현,Zeungnam Bien 동국대학교 정보융합기술원 2008 International Journal of Assistive Robotics and Sy Vol.9 No.3

        This paper presents the developmentof a piano-playing robot with motion-sound mapping in order to provide the elderly a means of entertainment that can interact with them while it is in operation. A piano-playing robot composed of a personal computer, a robotic arm, and a robotic hand is first developed to make a system that can play piano mechanically. Kinematic, dynamic equations, and Jacobian matrix for the robotic arm and the robotic finger are then derived for realtime control and simulation of the system. A study on the actions underlying sound generation in acoustic piano is carried out to have an insight into the relations between piano sound and keys’ motion. These relations are later represented by neural networks. By using these relations, the pianoplaying robot can produce fascinating music as a result of mimicking sample music. Experiment results demonstrate that the developed system outperforms existing systems in the sense of music attractiveness and make it a candidate to be used as a service robot in entertaining human being.

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