Browsing by Author "Orapin Komutiban"

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    A Study of the Optimal Conditions for Extracting and Precipitating Silica from Rice Husk Using the Hydrothermal Method in a Base Medium
    (Research and Development Institute Suan Dusit University, 2024) Orapin Komutiban; Jantharat Wutisatwongkul; Sorasutee Buapool; Khwunjit Itsarasook; Piyanuch Prompamorn; Jittarawadee Tanghiranra; Piyaporn Waranusantigul; J. Wutisatwongkul; Faculty of Science and Technology, Suan Dusit University, Bangkok, 10700, Thailand; email: jantharat_wut@dusit.ac.th
    This research investigated the extraction and precipitation methods of silica from rice husk using hydrothermal treatment under basic conditions. It was observed that by subjecting raw rice husk and black rice husk ash to burnt at a temperature of 700¡C for 6 hr raw rice husk yielded 10.68%, while black rice husk yielded 85.40%. The optimal condition for extracting silica is 1 molar of sodium hydroxide at a temperature of 100¡C for 6 hr. Silica extracted from raw materials that have undergone acid pretreatment yields a higher quantity compared to silica from untreated raw materials. However, the raw rice husk, burnt raw rice husk, black rice husk ash and burnt black rice husk ash have silica % of 16.20, 77.60, 63.10 and 89.0, respectively. When the extracted silica was analyzed for its physical characteristics using an inverted microscope, it was observed that silica subjected to acid pretreatment exhibits uniformly sized particles. The examination of particle size using the extraction method revealed that the silica particles were smaller than 53 _m and when all extracted silica was analyzed for functional groups using the FT-IR technique, the siloxane group (Si-O-Si) was found in the wavenumber range of 1,090-801 cm-_. Additionally, the hydroxyl group (-OH) was observed at the wavenumber of 3,400 cm-_. After conducting BrunauerÐEmmettÐTeller Analysis (BET analysis) on silica obtained from burnt rice husk and burnt black rice husk ash, both untreated and treated with HCl, it was found that the pore diameter of the extracted silica ranged from 8.14 to 19.15 nm. This suggests that the silica possesses mesoporous characteristics. Furthermore, the acid-leached silica exhibited a decrease in particle size and an increase in surface area. Specifically, the silica derived from burnt rice husk and treated with HCl demonstrated particle size and surface area values that closely resembled those of commercial-grade silica. When studying the effectiveness of silica in adsorbing methylene blue, the findings showed that the extracted silica demonstrates better adsorption capability for methy lene blue compared to commercial silica. The adsorption values ranged from 1302.49 to 1706.35 mg MB/g, representing 65.78-86.17%. From the investigation of the isotherm for methylene blue adsorption with the extracted silica, it is evident that the adsorption conforms to Freundlich model, indicating a multilayer adsorption behaviour. The method of extracting and precipitating silica through hydrothermal treatment under basic conditions proves to be an effective approach for preparing micro-sized silica particles. © 2024, Research and Development Institute Suan Dusit University. All rights reserved.
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    A Study of the Optimal Conditions for Extracting and Precipitating Silica from Rice Husk Using the Hydrothermal Method in a Base Medium
    (Graphicsite, 2024-04-30) Orapin Komutiban; Jantharat Wutisatwongkul; Sorasutee Buapool; Khwunjit Itsarasook; Piyanuch Prompamorn; Jittarawadee Tanghiranra; Piyaporn Waranusantigul
    This research investigated the extraction and precipitation methods of silica from rice husk using hydrothermal treatment under basic conditions. It was observed that by subjecting raw rice husk and black rice husk ash to burnt at a temperature of 700°C for 6 hr raw rice husk yielded 10.68%, while black rice husk yielded 85.40%. The optimal condition for extracting silica is 1 molar of sodium hydroxide at a temperature of 100°C for 6 hr. Silica extracted from raw materials that have undergone acid pretreatment yields a higher quantity compared to silica from untreated raw materials. However, the raw rice husk, burnt raw rice husk, black rice husk ash and burnt black rice husk ash have silica % of 16.20, 77.60, 63.10 and 89.0, respectively. When the extracted silica was analyzed for its physical characteristics using an inverted microscope, it was observed that silica subjected to acid pretreatment exhibits uniformly sized particles. The examination of particle size using the extraction method revealed that the silica particles were smaller than 53 μm and when all extracted silica was analyzed for functional groups using the FT-IR technique, the siloxane group (Si-O-Si) was found in the wavenumber range of 1,090-801 cm-¹. Additionally, the hydroxyl group (-OH) was observed at the wavenumber of 3,400 cm-¹. After conducting Brunauer–Emmett–Teller Analysis (BET analysis) on silica obtained from burnt rice husk and burnt black rice husk ash, both untreated and treated with HCl, it was found that the pore diameter of the extracted silica ranged from 8.14 to 19.15 nm. This suggests that the silica possesses mesoporous characteristics. Furthermore, the acid-leached silica exhibited a decrease in particle size and an increase in surface area. Specifically, the silica derived from burnt rice husk and treated with HCl demonstrated particle size and surface area values that closely resembled those of commercial-grade silica. When studying the effectiveness of silica in adsorbing methylene blue, the findings showed that the extracted silica demonstrates better adsorption capability for methy lene blue compared to commercial silica. The adsorption values ranged from 1302.49 to 1706.35 mg MB/g, representing 65.78-86.17%. From the investigation of the isotherm for methylene blue adsorption with the extracted silica, it is evident that the adsorption conforms to Freundlich model, indicating a multilayer adsorption behaviour. The method of extracting and precipitating silica through hydrothermal treatment under basic conditions proves to be an effective approach for preparing micro-sized silica particles.
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    Preparation, Characterization and Evaluation of Octyl Methoxycinnamate (OMC)-Loaded Solid Lipid Nanoparticles (SLNs) by Using a Microemulsion Technique
    (Research and Development Institute Suan Dusit University, 2022) Khwunjit Itsarasook; Piyanuch Prompamorn; Surapa Modsuwan; Jittarawadee Tanghiranrat; Orapin Komutiban; Woraphot Haritakun; Jantharat Wutisatwongkul; Kanlayaporn Chantree; K. Itsarasook; Faculty of Science and Technology, Suphanburi Campus, Suan Dusit University, Suphanburi, 72000, Thailand; email: khwunjit_its@dusit.ac.th
    This research prepared the solid lipid nanoparticles (SLNs) based on microemulsion to load octyl methoxycinnamate (OMC) as a UV absorber for instability protection. The optimal microemulsion formulation was selected by visual assessment according to a transparent and thermodynamically system form. The optimal microemulsion obtained from the experiment composed of 10% w/w glyceryl monostearate (GMS, solid lipid), 10% w/w Tween 80 (surfactant), 15% w/w PEG-40 hydrogenated castor oil (surfactant) and 20% w/w ethanol (co-surfactant). Various processing parameters for the preparation of SLN was carried out using three factors including, 1) warm microemulsion (mL) and iced water ratio (mL), 2) homogenization speed (rpm) and 3) homogenization time (min) and two responses assessed were particle size and polydispersity index (PDI) to obtain a SLNs batch with smaller particle size and optimum PDI. The OMC-loaded SLN had 693.07± 0.05 nm mean particle size and 0.56±0.04 PDI, prepared by optimal processing parameters. The surface morphology of the SLNs was assessed by transmission electron microscopy (TEM), the result found that OMC-loaded SLN showed a smooth surface and spherical shape. Entrapment efficiency of OMC-loaded SLN was found to be 99.89±0.020%. The stability testing of the prepared SLN was studied. Result found that OMC-loaded SLN showed slightly lower stable compared with the initial condition. All obtained results indicated that this method and processing parameters can prepare the SLNs which was suitable for cosmetic application. © 2022, Research and Development Institute Suan Dusit University. All rights reserved.
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    Preparation, Characterization and Evaluation of Octyl Methoxycinnamate (OMC)-Loaded Solid Lipid Nanoparticles (SLNs) by Using a Microemulsion Technique
    (Graphicsite, 2023-09-26) Khwunjit Itsarasook; Piyanuch Prompamorn; Surapa Modsuwan; Jittarawadee Tanghiranrat; Orapin Komutiban; Woraphot Haritakun; Jantharat Wutisatwongkul; Kanlayaporn Chantree
    This research prepared the solid lipid nanoparticles (SLNs) based on microemulsion to load octyl methoxycinnamate (OMC) as a UV absorber for instability protection. The optimal microemulsion formulation was selected by visual assessment according to a transparent and thermodynamically system form. The optimal microemulsion obtained from the experiment composed of 10% w/w glyceryl monostearate (GMS, solid lipid), 10% w/w Tween 80 (surfactant), 15% w/w PEG-40 hydrogenated castor oil (surfactant) and 20% w/w ethanol (co-surfactant). Various processing parameters for the preparation of SLN was carried out using three factors including, 1) warm microemulsion (mL) and iced water ratio (mL), 2) homogenization speed (rpm) and 3) homogenization time (min) and two responses assessed were particle size and polydispersity index (PDI) to obtain a SLNs batch with smaller particle size and optimum PDI. The OMC-loaded SLN had 693.07± 0.05 nm mean particle size and 0.56±0.04 PDI, prepared by optimal processing parameters. The surface morphology of the SLNs was assessed by transmission electron microscopy (TEM), the result found that OMC-loaded SLN showed a smooth surface and spherical shape. Entrapment efficiency of OMC-loaded SLN was found to be 99.89±0.020% . The stability testing of the prepared SLN was studied. Result found that OMC-loaded SLN showed slightly lower stable compared with the initial condition. All obtained results indicated that this method and processing parameters can prepare the SLNs which was suitable for cosmetic application.
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    Selection of Potential Bacteria in Termite Nest and Gut for Sustainable Agriculture
    (Walailak University, 2024) Phanukit Kunhachan; Wandee Sirithana; Orapin Komutiban; Vassanasak Limkhuansuwan; Phanchai Menchai; Chanaporn Trakunjae; Thanasak Lomthong; Kriangsak Ruchusatsawat; Srisuda Samaimai; S. Samaimai; Faculty of Science and Technology, Suan Dusit University, Bangkok, 10700, Thailand; email: srisuda_sam@dusit.ac.th
    In this study, bacteria with the best abilities in cellulose degradation, siderophore production, phosphate solubility, and Pythium parasitica inhibition were selected from termite nests and guts. The isolate BTNASP 5-2, BTPK 5-3 and BTNA 5-1 from termite guts exhibited highest in siderophore production index (SPI) (4.16 ± 0.21), phosphate solubilizing index (PSI) (2.10 ± 0.14) and percentage inhibition of radial growth (PIRG) (67.07 ± 4.02 %), respectively. The BGNACMC 4-3 isolated from termite nest gave the highest cellulolytic index (CI) of 5.17 ± 0.24. Bacterial classification was performed using 16s rRNA gene sequencing. The isolates BTPK 5-3, BGNACMC 4-3 and BTNA 5-1 were found closely related to Bacillus cereus, whereas the bacterial isolate BTNASP 5-2 was closely related to Bacillus subtilis. It is also suggested that the Bacillus cereus exhibited a variety of biological activities, denoting the highest cellulase, phosphate-solubilizing and antifungal activities, while Bacillus subtilis produced only a siderophore. The results obtained suggest that the bacteria selected will be used to develop bio-compost to promote plant growth, leading to sustainable farming. © 2024, Walailak University. All rights reserved.