Suteewong, Teeraporn

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Suteewong, Teeraporn
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teeraporn.su@kmitl.ac.th

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    PMMA particles coated with chitosan-silver nanoparticles as a dual antibacterial modifier for natural rubber latex films
    (2019-02-01)
    Suteewong, Teeraporn
    ;
    Wongpreecha, Jitrada
    ;
    Polpanich, Duangporn
    ;
    Jangpatarapongsa, Kulachart
    ;
    Kaewsaneha, Chariya
    The antibacterial activity in sulphur prevulcanized natural rubber (SPNR) latex film was effectively improved by deposition of poly(methyl methacrylate) (PMMA) particles encircled with chitosan-coated silver nanoparticles (AgNPs-CS). With the focus on a green process, CS was selected as a safe reducing and stabilizing agent for the one-step synthesis of AgNPs-CS (38 nm, +40.4 mV) in an autoclave. The adsorption of small-sized AgNPs-CS directly onto rubber film did not provide an inhibitory effect on S. aureus. It also had a low antibacterial effect on E. coli. This is because of the particles becoming completely/partially submerged into the soft rubber matrix upon drying. Hence, the AgNPs-CS were fabricated as a shell surrounding a rigid PMMA core (496 nm, -30.9 mV). This was done using a heterocoagulation technique prior to coating on SPNR film. The presence of PMMA/AgNPs-CS on the surface of SPNR film effectively increased the surface roughness from ca. 44 to 150 nm. This substantially promoted the antibacterial activity against E. coli and S. aureus by way of contact killing and repelling mechanisms. The cytotoxicity on L-929 fibroblasts was also suppressed. This study would be, therefore, applicable to the development of antibacterial SPNR film with high surface roughness, low cytotoxicity. It could also be applied for other soft substrates.
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    Amino acid as a biodegradation accelerator of mesoporous silica nanoparticles
    (2019-07-01)
    Ratirotjanakul, Waranya
    ;
    Suteewong, Teeraporn
    ;
    Polpanich, Duangporn
    ;
    Tangboriboonrat, Pramuan
    In order to avoid cumulative toxicity of the remained mesoporous silica nanoparticles (MSNs) in biological systems, three amino acids (aâs), i.e., glycine (Gly), aspartic acid (Asp) and cysteine (Cys), were incorporated into MSNs for accelerating their biodegradation. Aâ was conjugated with 3-isocyanatopropyl triethoxysilane (ICPTES) before reacting with tetraethyl orthosilicate to form aâ-MSNs via the sol-gel process based co-condensation. FTIR spectra confirmed the urea bond formation in aâ-ICPTES, whereas silicon resonances of T<sup>2</sup> and T<sup>3</sup> in <sup>29</sup>Si NMR spectrum indicated the incorporation of aâ in MSNs. Spherical bare-MSNs (112 nm) were obtained while the rod-like particles were formed in the case of Gly-MSNs (73 nm in length), Asp-MSNs (90 nm in length), and Cys-MSNs (163 nm in length). The trend of %Si dissolution rate analyzed from microwave plasma-atomic emission spectrometer (MP-AES) of aâ-MSNs in phosphate buffer saline (PBS)/trypsin enzyme (pH 7.4) was 3–5 times higher than in PBS (pH 7.4) and 7–8 times higher than in acetate buffer (pH 5.2), respectively. The Asp-MSNs having two carboxylic groups showed the highest degradability, followed by Cys-MSNs, Gly-MSNs, and bare-MSNs in all three media. By capability of aâ as a dissolution promoter, the aâ-MSNs would be an effective and alternative material used as drug carrier in biomedical applications.
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    Parameters Governing Void Formation and Expansion of Hollow Natural Rubber Latex Particles for Their Use as Bio-based Nanocapsules
    (2025-02-01)
    Promlok, Duangkamol
    ;
    Suteewong, Teeraporn
    ;
    Polpanich, Duangporn
    ;
    Tangboriboonrat, Pramuan
    This work reports the hollow latex (HL) particles developed from natural rubber latex particles (NRPs), known for their broad size distribution and non-spherical shape. HL-NRPs, prepared via the seeded emulsion polymerization in one pot, are studied as potential bio-based nanocapsules for the first time. Effects of types of crosslinking agents and swelling agents, the addition of sodium dodecyl sulfate (SDS), and monomer compositions on the void formation and expansion are systematically investigated. The combined effects of phase separation between NR core swelled with divinyl benzene (DVB) and hydrophilic poly(methyl methacrylate/acrylic acid) P(MMA/AA) shell, the entanglement of rubber chains copolymerized with MMA/DVB/AA monomers, and the osmosis from external aqueous medium promoted the void formation. While crosslinking agents affected the void formation and shell strength, SDS and type of monomers governed colloidal stability and polymerization loci as well as morphology, respectively. The ability of HL-NRPs as nanocapsules is explored by encapsulating fluorescent dyes, i.e., hydrophilic fluorescein isothiocyanate (FITC) and lipophilic Nile red (NiR), as model cargo. From the dye release test after 24 h, the cumulative concentrations of FITC in methanol and of NiR in tetrahydrofuran are 0.17 and 0.11 µg mL<sup>−1</sup>, respectively. The results suggested that FITC is released from HL-NRPs easier than NiR possibly due to the different encapsulation location.
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    PMMA-N,N,N-trimethyl chitosan nanoparticles for fabrication of antibacterial natural rubber latex gloves
    (2014-08-30)
    Arpornwichanop, Thanida
    ;
    Polpanich, Duangporn
    ;
    Thiramanas, Raweewan
    ;
    Suteewong, Teeraporn
    ;
    Tangboriboonrat, Pramuan
    This paper presents one-pot synthesis of N,N,N-trimethyl chitosan (TMC) stabilized poly(methyl methacrylate) (PMMA) latex particles via the miniemulsion polymerization technique. From <sup>1</sup>H NMR, synthesized TMC contains 52% degree of quaternization. Compared to native biopolymer chitosan, TMC possesses permanently positive charges as well as provides greater antibacterial activity. Combining properties of PMMA and TMC, PMMA-TMC latex nanoparticles hydrodynamic size.© 2014 Elsevier Ltd. All rights reserved.
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    One-pot, large-scale green synthesis of silver nanoparticles-chitosan with enhanced antibacterial activity and low cytotoxicity
    (2018-11-01)
    Wongpreecha, Jitrada
    ;
    Polpanich, Duangporn
    ;
    Suteewong, Teeraporn
    ;
    Kaewsaneha, Chariya
    ;
    Tangboriboonrat, Pramuan
    Silver nanoparticles stabilized with chitosan (AgNPs-CS) were synthesized based on the one-pot green process in an autoclave, in which CS acts as reducing agent as well as stabilizer. Effects related to temperature and pressure input on particle formation were systematically investigated. Mechanism taking place during particle nucleation and growth was proposed. The data from UV–vis absorption, X-ray diffraction pattern and morphology confirmed the formation of AgNPs-CS with face-centered cubic (fcc) structure. The synthesized AgNPs-CS showed the effective antibacterial activity against both E. coli and S. aureus. The minimum bactericidal concentration values of 39.1 and 312.5 μg/ml for E. coli and S. aureus, respectively, did not show cytotoxicity to L-929 fibroblast. Moreover, the covering of CS on the surface of AgNPs-CS was proven to reduce the cytotoxicity when compared with commercial citrate-stabilized AgNPs. Considering simple and mild process, this synthesis approach would be helpful for development of benign AgNPs-based antibacterial agent.
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    Hollow core-shell particles via NR latex seeded emulsion polymerization
    (2016-09-02)
    Wichaita, Waraporn
    ;
    Polpanich, Duangporn
    ;
    Suteewong, Teeraporn
    ;
    Tangboriboonrat, Pramuan
    Natural rubber (NR)-based hollow latex (HL) particles have been prepared by seeded emulsion polymerization of methyl methacrylate/divinyl benzene/acrylic acid (MMA/DVB/AA) monomers on NR seed. By using tert-butyl hydroperoxide/tetraethylene pentamine (t-BuHP/TEPA) as a redox initiator, the locus of polymerization was localized at the surface of the NR particle. After swelling with monomers, DVB in NR particle gradually moved outward to compensate the co-polymerization. Phase separation between the NR seed and the polymeric shell occurred and a void was subsequently formed at a MMA/DVB molar ratio of 2.7/1. The void cavity was enlarged when the monomer to seed (M/S) weight ratio was increased to 4/1. Without the necessity of any residual core removal, polydisperse NR-based hollow nanocomposites (298 ± 58 nm) possessing NR-P(MMA/DVB/AA) double-layered shell and a single void (155 ± 37 nm) were obtained. SEM images revealed an increase in surface roughness of the HL particle with increasing M/S weight ratios. The large specific surface area of these NR-based hollow nanocomposites (114.6 m<sup>2</sup>/g) with a 3.5 nm pore diameter indicates that the polymeric shell is mesoporous. The presence of carboxyl groups, as indicated by negative zeta potentials, can further facilitate surface functionalization. The large void cavity of these NR-based HL particles makes them particularly suited as delivery vehicle systems.
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    Hollow amorphous TiO2 particles for transparent UV shielding film
    (2025-05-01)
    Pukveera, Nichapat
    ;
    Polpanich, Duangporn
    ;
    Wongngam, Yodsathorn
    ;
    Tangboriboonrat, Pramuan
    ;
    Suteewong, Teeraporn
    Crystalline titanium dioxide (C-TiO<inf>2</inf>) particles are widely used as inorganic filters in coatings due to their high refractive indexes (n) and functions in photocatalysis. However, these particles may pose environmental and health risks due to their crystalline nature. Additionally, the long-term use of C-TiO<inf>2</inf> has the potential to damage organic contents due to their photocatalytic properties. These drawbacks make amorphous TiO<inf>2</inf> (A-TiO<inf>2</inf>) appealing for use in non-catalysis applications, e.g., coatings. This study aims to develop an alternative UV filter derived from A-TiO<inf>2</inf> with a hollow structure (HA-TiO<inf>2</inf>) that can be used in coatings. The hollow interior of the designed HA-TiO<inf>2</inf> structure compensates for its lower n through multiple light scattering, enhancing the UV shielding performance. Furthermore, the amorphous structure also promotes the transparency of the composite film. To obtain HA-TiO<inf>2</inf>, TiO<inf>2</inf>-coated silica (SiO<inf>2</inf>@TiO<inf>2</inf>) particles were synthesized using the modified sol-gel method. Selective etching was employed to remove the dense (D) SiO<inf>2</inf> core (hard template). The resulting HA-TiO<inf>2</inf> particles possessed higher UV absorption properties than D-SiO<inf>2</inf>, SiO<inf>2</inf>@TiO<inf>2</inf>, dense amorphous (DA) TiO<inf>2</inf> particles, and commercial C-TiO<inf>2</inf> (TiONA® 595, rutile). Poly(vinyl alcohol) films containing HA-TiO<inf>2</inf> particles displayed the highest UV shielding performance, effectively blocking the photodegradation of methylene blue while maintaining film transparency. The integration of high UV shielding performance of the hollow structure and transparency of the amorphous matter provided synergistic effects. Overall, HA-TiO<inf>2</inf> shows promise as a safer alternative to current inorganic UV filters in a variety of applications, including coatings, textiles, and packaging.
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    Enhanced antibacterial activity of NR latex gloves with raspberry-like PMMA-N,N,N-trimethyl chitosan particles
    (2015-11-01)
    Arpornwichanop, Thanida
    ;
    Polpanich, Duangporn
    ;
    Thiramanas, Raweewan
    ;
    Suteewong, Teeraporn
    ;
    Tangboriboonrat, Pramuan
    Raspberry-like poly(methyl methacrylate) (PMMA) latex particles stabilized with silica nanoparticles (SiNPs) were prepared via the Pickering emulsion polymerization for use as substrate of N,N,N-trimethyl chitosan (TMC) adsorption. With the aims to simultaneously reduce the surface friction and improve the antibacterial activity of rubber gloves, the synthesized PMMA-SiNPs(TMC) particles were electrostatically deposited onto a sulphur prevulcanized natural rubber (SPNR) latex film. From SEM and AFM analyses, the results showed the highest surface coverage of PMMA-SiNPs(TMC) particles on the surface of SPNR film of 41% and the surface roughness of 69. nm. The coated SPNR film exhibited effective antibacterial activity especially against S. aureus. Therefore, this investigation would be useful for fabrication of special gloves with antibacterial properties.
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