Detsri, Ekarat
Loading...
26 results
Now showing 1 - 10 of 26
- Some of the metrics are blocked by yourconsent settings
Item type:Publication, Superhydrophobilization of SiO2 surface with two alkylsilanes for an application in oil/water separation(2018-04-01); ; This study reported a novel approach to superhydrophobilize silica (SiO<inf>2</inf>) surface by silanizing with two alkylsilanes including non-polar short hydrocarbon chains of chlorotrimethylsilane (CTMS) followed by long hydrocarbon chains of octadecyltrichlorosilane (OTS). The silanization of CTMS prior to OTS affected the increase in the density of short and long alkyl chains throughout SiO<inf>2</inf> surface resulting in the surface with low surface energy and high degree of hierarchical micro-nanoscale roughness which were responsible for the superhydrophobicity. The oil/water separation filters prepared by coating cotton fabric with the CTMS- and OTS-modified SiO<inf>2</inf>/polystyrene (PS) composite using a weight ratio of the modified SiO<inf>2</inf>:PS at 2:1 possessed the highest water contact angles of 156° ± 1°. The superhydrophobic/superoleophilic filters showed excellent water repellent, oil/water separation efficiency, and reusability. The results obtained in this study suggest that salinizing the two different structure alkylsilanes, CTMS followed by OTS, can provide synergetic benefit in improving the superhydrophobicity by enhancing the density of alkyl chains on SiO<inf>2</inf> surface. This alternative strategy can be extensively applied for development of other superhydrophobic materials. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Antimicrobial nanolayer films of chloroxylenol–carboxyethylchitosan–modified silver nanoparticles for enhanced surgical suture performance(2024-07-20); ; Antimicrobial surgical suture materials incorporating chloroxylenol-carboxyethylchitosan-modified silver nanoparticles (CECSX-AgNPs) were successfully prepared using the Layer-by-Layer (LbL) deposition technique. Chitosan (CS) was covalently affixed with chloroxylenol as hydrophobic functional groups (PCMX), yielding chloroxylenol-chitosan (CSX) and later hydrophilic acrylic acid onto the CSX skeleton, providing a novel water-soluble antimicrobial agent of chloroxylenol-carboxyethylchitosan (CECSX). <sup>1</sup>H NMR confirmed the successful substitution of PCMX and acrylic acid onto CS, with %DS<inf>PCMX</inf> and %DS<inf>AA</inf> of 8.0 and 33.0, respectively. CECSX successfully stabilized AgNPs via the chemical reduction method, resulting in CECSX modified AgNPs. The colloidal solution exhibited a yellowish hue, spherical shape, monodispersity with an average particle size of 4.8 ± 2.4 nm, and a zeta potential value of −20.97 ± 0.03 mV. Minimum inhibitory concentration (MIC) values for CECSX-AgNPs against E. coli (ATCC25922), S. aureus (ATCC25923), and A. baumanii (ATCC19606) were determined as 25, 12.5, and 1.56 mg/L, respectively. Using the LbL deposition technique, CECSX-AgNPs were successfully deposited onto various suture materials including cotton, polyamide, and polypropylene. Remarkably, CECSX-AgNPs coated surgical sutures exhibited the highest bacterial reduction of 99.99 %. These findings underscore the efficacy of CECSX as a high-performance stabilizing agent for AgNPs production, providing outstanding antibacterial activity on diverse surgical suture materials and promoting the wound healing process. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Smartphone-based disposable cotton-swab sensor loaded with creatinine/Cu–chlorophyllin–stabilized AuNPs for ultrasensitive RGB colorimetric detection of mercury (II) ions in aquatic environments(2026-05-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, New Chitosan-Grafted Thymol Coated on Gold Nanoparticles for Control of Cariogenic Bacteria in the Oral Cavity(2022-08-02); ; Chitosan-grafted thymol (CST) coated on gold nanoparticles has been synthesized and characterized for the design of antimicrobial materials. CST was synthesized via adapting the Mannich reaction, and it acted as the capping agent for the synthesis of gold nanoparticles (AuNPs). The grafting of thymol onto the side chain of chitosan has provided a degree of substitution value (%DS<inf>NMR</inf>) of 10.0%, calculated by nuclear magnetic resonance spectroscopy. UV-visible spectrometry and elemental analysis were used to confirm the successful synthesis of CST through adapting the Mannich reaction. The appropriate concentration of CST for AuNP synthesis was found to be 0.020%w/v. A red-wine colloidal AuNP solution of 2.41-3.30 nM particle size exhibits a strong surface plasmon resonance at 502 nm, which shows negative charges at pH = 9 of -36.37 mV. This result evidenced that the AuNPs showed electrostatic repulsion and CST played a role as a capping agent to provide a good dispersion and stability state. CST coated on the AuNP surface was successfully utilized for the control of cariogenic bacteria in the oral cavity. The results obtained from this study show that the tuning of the capping agent used in the synthesis step strongly influences the latter antimicrobial activity of the nanoparticles against Streptococcus mutans ATCC 25175 and Streptococcus sobrinus ATCC 33402 activity, with an inhibition zone of 15.90 and 14.25 mm, respectively. The average minimum inhibitory concentration values against S. mutans ATCC 25175 and S. sobrinus ATCC 33402 were found to be 25 and 100 mg/L, respectively, whereas the minimum bactericidal concentration values were 100 and 200 mg/L, respectively. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A sensitive and selective colorimetric sensor for reduced glutathione detection based on silver triangular nanoplates conjugated with gallic acid(2018-03-20); ; Silver triangular nanoplates conjugated with gallic acid (AgTNPs⋅GA) was designed and synthesized for colorimetric detection of reduced glutathione (GSH). The surface plasmon resonance (SPR) properties of AgTNPs⋅GA were strongly influenced by the addition of GSH. The detection principle was based on the aggregation of AgTNPs⋅GA, which leads to the significant bathochromic shift of the SPR spectra from 602 nm to 650 nm. The dramatic color changes from the initial dark blue to light blue can be observed, which allowed simple monitoring of GSH ether by naked eye and UV–vis spectrophotometer. With UV–vis spectrophotometer measurements, a quantitative linearity was established in the range of 0.5–5.0 nM (R<sup>2</sup> = 0.9919) and with a limit of detection (LOD) of 0.12 ± 0.02 nM. Relative standard deviation (RSD) of 3.46% and 1.82% (n = 10) were achieved for the determination of 1.0 and 3.0 nM, respectively. No interfering substances such as ascorbic acid, glucose, sucrose, citric acid, cysteine, Ca<sup>2+</sup>, Mg<sup>2+</sup>, Fe<sup>3+</sup> and K<sup>+</sup> were revealed in the AgTNPs⋅GA based assay. The proposed colorimetric strategy could be extended as the general platform for detection of GSH in dietary supplements and no significant differences in accuracy and precision were observed compared to HPLC standard method. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Ultrasonic-driven synthesis of Cu-chlorophyllin-stabilized silver nanoparticles for high-efficiency antimicrobial surgical suture coatings(2025-12-01); ; A novel Cu-chlorophyllin-stabilized silver nanoparticle (Ag<sup>0</sup><inf>NPs</inf>-Chl<inf>Cu</inf>) with potent antimicrobial properties was synthesized for the first time using an ultrasonically driven chemical reduction approach. In this approach, Cu-chlorophyllin (Chl<inf>Cu</inf>) acts as a stabilizing ligand, while sodium borohydride functions as the chemical reductant. The formation mechanism of Ag<sup>0</sup>-NPs<inf>CHL</inf> was elucidated, revealing that ultrasonic irradiation facilitates the in situ reduction of Ag (I) and its subsequent incorporation into the Chl<inf>Cu</inf> complex. Four pyrrole rings coordinate with Ag<sup>0</sup><inf>NPs</inf> through four nitrogen atoms, which serve as adsorption sites for the anchorage of Ag<sup>0</sup>-NPs<inf>CHL</inf>. Characterization by XPS revealed the presence of Ag-N bonding involving pyrrole units on the FCC structure of Ag<sup>0</sup><inf>NPs</inf>. Ag<sup>0</sup><inf>NPs</inf>-Chl<inf>Cu</inf> demonstrated a zeta potential of (-) 35.57±3.54 mV with a spherical shape and an average size of 6.72±1.72 nm, resulting in a stable colloidal dispersion with a monodispersed index. The synthesized Ag<sup>0</sup>-NPs<inf>CHL</inf> nanocomposites were subsequently deposited onto polyamide surgical sutures via an electrostatic Layer-by-Layer (LbL) self-assembly technique. The coated sutures exhibited >99.9 % antibacterial efficiency against E. coli (ATCC25922), S. aureus (ATCC25923), and A. baumanii (ATCC19606). While nanoparticle accumulation was observed in human primary epidermal keratinocyte (HEKa) cells, no cytotoxic effects were detected in the epidermis. This study highlights the effectiveness of Chl<inf>Cu</inf> as a dual stabilizing and coordinating agent for Ag⁰<inf>NPs</inf>, offering a promising approach for developing antimicrobial surgical materials. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Supramolecular electrochemical detection of bisphenol A using a melamine-functionalized reduced graphene oxide modified screen-printed electrode(2026-06-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Ultrasensitive electrochemical aptasensors based on trimetallic AuPt-Ru nanoparticles decorated RGO with disposable and low-cost goldleaf electrode for aflatoxin B1 quantification in agricultural products(2025-01-01); Due to the significant increase in cases of liver cirrhosis and hepatocellular carcinoma associated with the agricultural products consumption contaminated with Aflatoxin B1 (AFB1), there is an urgent need for rapid AFB1 detection methods. Herein, we propose using waxberry-like heterostructure AuPt-Ru nanoparticles supported by RGO (AuPt-Ru/RGO) embedded goldleaf as a disposable and low-cost electrode (GLE<inf>AuPt-Ru/RGO</inf>) for electrochemical aptasensor detection of AFB1. The trimetallic AuPt-Ru nanocomposite was synthesized through the ultrasonic-driven chemical reduction method. The AuPt-Ru was integrated with RGO to accelerate the electron transfer and increase the specific immobilizing surface area of the thiol-5′-terminated modified aptamer (aptamer) to target AFB1 on GLE. The electrochemical aptasensor GLE<inf>AuPt-Ru/RGO</inf> shows a highly selective response for AFB1 through specific hydrogen bonding and π-π stacking interactions. The linearity of differential pulse voltammetry (DPV) measurements for AFB1 was 0.3–30.0 pg mL<sup>−1</sup> (R<sup>2</sup> = 0.9972) with a detection limit (LOD) and a quantification limit (LOQ) of 9 × 10<sup>−3</sup> pg mL<sup>−1</sup> and 3.1 × 10<sup>−2</sup> pg mL<sup>−1</sup>, respectively. The developed aptamer-based GLE<inf>AuPt-Ru/RGO</inf> performed effectively in actual samples, with recoveries ranging from 94.6 % to 107.9 % in agricultural products including dried red chili, garlic, peanuts, pepper, and Thai jasmine rice. The fabricated aptamer-based GLE-decorated AuPt-Ru/RGO exhibited excellent electrochemical behavior similar to that of a modified commercial electrode, which has great potential application prospects for detecting AFB1 in agricultural products. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Aggregated gallic acid-modified platinum nanoparticles as colorimetric sensor for tannic acid detection in beverages based on displacement phenomenon(2024-10-01); ; A new colorimetric assay for the rapid detection of tannic acid in beverage samples based on displacement phenomenon of aggregated gallic acid-modified platinum nanoparticles is developed for the first time. PtNPs were functionalized with gallic acid, promoting the formation of the green-hued aggregated nanoparticles. While colorimetry offers a rapid method for identifying tannic acid, challenges remain in sensitivity and accuracy of detection on the PtNPs colorimetric probe, particularly in the presence of anthocyanin interferences. To address this, we developed a sample preparation method to degrade anthocyanin in beverages. Tannic acid was easily displaced onto the gallic acid-coated PtNPs surfaces, causing dispersion and resulting in a visible color change from green to orange − brown. Under the optimal conditions, the colorimetric sensor exhibited a linear response in the range of 1 − 2,000 µmol/L (R<sup>2</sup> = 0.9991). The limit of detection (LOD) and the limit of quantification (LOQ) were found at 0.02 and 0.09 µmol/L, respectively. The proposed sensor expressed superior selectivity over other interfering substances and demonstrated excellent precision with a relative standard deviation (RSD) of 1.00 %−3.36 %. More importantly, recoveries ranging from 95.0 − 104.7 % were obtained, indicating the capability of proposed colorimetric sensor to detect tannic acid rapidly and accurately in real beverage samples. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Microwave-assisted synthesis of unmodified gold nanoparticles for colorimetric detection of dopamine(2017-01-01);