Browsing by Author "Dusit Angthararuk"
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Item Degradation products of profenofos as identified by high-field FTICR mass spectrometry: Isotopic fine structure approach(Taylor and Francis Inc., 2017) Dusit Angthararuk; Mourad Harir; Philippe Schmitt-Kopplin; Somyote Sutthivaiyakit; Antonius Kettrup; Pakawadee Sutthivaiyakit; M. Harir; Research Unit Analytical BioGeoChemistry, German Research Center for Environmental Health, Helmholtz Zentrum M�nchen, Neuherberg, Ingolstaedter Landstrasse 1, D-85764, Germany; email: Mourad.harir@helmholtz-muenchen.deThis study was performed to identify the degradation products of profenofos �a phenyl organothiophosphate insecticide� in raw water (RW) collected from the entry point of Metropolitan Water Works Authority �Bangkaen, Thailand� and ultrapure water (UPW) with and without TiO2 under simulated sunlight irradiation. Degradation of profenofos was followed with ultrahigh performance liquid chromatography (UHPLC) and follows pseudo first-order kinetic. Accordingly, high-field FTICR mass spectrometry coupled to an electrospray ionization source was used to reveal the degradation routes of profenofos and the isotopic fine structures (IFS) elucidations to approve the chemical structures of its degradation products. More degradation products were detected in UPW as compared to RW. Consequently, two main degradation pathways namely (i) interactive replacements of bromine and hydrogen by hydroxyl functional groups and (ii) rupture of PO, PS, CBr and CCl bonds were observed. None interactive replacement of chlorine by hydroxyl functional group was detected. Accordingly, mechanistical pathways of the main degradation products were established. � 2017 Taylor & Francis Group, LLC.Item Formation of Rice Bran Glycosphingolipids Microemulsion Powders with Vitamin B1, B2, B12, and Folate as Additives for Elderly Food(Research and Development Institute Suan Dusit University, 2023) Junjarus Sermsathanaswadi; Siwawit Buasuwan; Dusit Angthararuk; Rittipun Rungruang; J. Sermsathanaswadi; Faculty of Science and Technology, Suan Dusit University, Bangkok, 10300, Thailand; email: janjaras_ser@dusit.ac.thThis research investigated the extraction of glycosphingolipids from rice bran as an emulsifier to form microemulsions with vitamins B1, B2, B12 and folate being added to prepare the emulsion powder as the dietary supplement materials. Rice bran, a low-value agricultural material, was used as raw material for glycosphingolipids extraction using a solvent mixed between dichloromethane and methanol at a ratio of 2:1. The crude extract was observed in physical characteristics. The sphingosine in crude extract was analyzed by spectrophotometer technique. The emulsion was prepared using a mixture of crude extract, Polysorbate 80 and coconut oil. The average particle size of the emulsion was determined using Particle Size Analyzer. The emulsion was made into powder using various drying methods including hot air drying, spray drying and freeze-drying method. The mannan-oligosaccharides were used as an additive to replace the expensive mannitol or the energy-producing sucrose. The distribution property in distilled water of the emulsion powder was determined. The morphology and the surface of the powder emulsion were measured using SEM. The resistance to the imitation of the digestive system and encapsulation efficiency were determined. After extraction, the yield of crude glycosphingolipids extract from rice bran was 20.65%. The crude extract was a clear liquid, slightly yellow, insoluble in water and looks like oil. We found that the crude extract contained sphingosine 22.75 _g/g of crude extract from rice bran. When the emulsion was prepared, the characteristic of the emulsion showed the colloidal solution with a milky white color. The size of the emulsion without vitamins and with vitamins B1, B2, B12, and folate (total 100 ppm) were 70-75 nm and 74.4-78.1 nm, respectively. This result illustrated that the emulsion was classified as glycosphingolipid microemulsion. The emulsion powder was prepared and we found that the hot air drying and spray drying methods showed a viscous liquid with an oily smell. Whereas the freeze-drying method created the form of a light yellow, odorless and fine emulsion powder. The average particle size of emulsion was 80-100 nm. The solubility test showed that the emulsion powder was able to dissolve up to 300 g/L and 450 g/L at 25¡C and 70¡C, respectively. The morphological analysis showed that the powder emulsion was quite spherical with a diameter of less than 100 micrometers. In a simulated digestive system test, it was found that glycosphingolipid emulsion releases all vitamins in gastric simulated fluids and simulated small intestinal fluid conditions with values greater than 80%. © 2023, Research and Development Institute Suan Dusit University. All rights reserved.Item Formation of Rice Bran Glycosphingolipids Microemulsion Powders with Vitamin B1, B2, B12, and Folate as Additives for Elderly Food(Graphicsite, 2024-12-18) Junjarus Sermsathanaswadi; Siwawit Buasuwan; Dusit Angthararuk; Rittipun RungruangThis research investigated the extraction of glycosphingolipids from rice bran as an emulsifier to form microemulsions with vitamins B1, B2, B12 and folate being added to prepare the emulsion powder as the dietary supplement materials. Rice bran, a low-value agricultural material, was used as raw material for glycosphingolipids extraction using a solvent mixed between dichloromethane and methanol at a ratio of 2:1. The crude extract was observed in physical characteristics. The sphingosine in crude extract was analyzed by spectrophotometer technique. The emulsion was prepared using a mixture of crude extract, Polysorbate 80 and coconut oil. The average particle size of the emulsion was determined using Particle Size Analyzer. The emulsion was made into powder using various drying methods including hot air drying, spray drying and freeze-drying method. The mannan-oligosaccharides were used as an additive to replace the expensive mannitol or the energy-producing sucrose. The distribution property in distilled water of the emulsion powder was determined. The morphology and the surface of the powder emulsion were measured using SEM. The resistance to the imitation of the digestive system and encapsulation efficiency were determined. After extraction, the yield of crude glycosphingolipids extract from rice bran was 20.65%. The crude extract was a clear liquid, slightly yellow, insoluble in water and looks like oil. We found that the crude extract contained sphingosine 22.75 micrograms/gram of crude extract from rice bran. When the emulsion was prepared, the characteristic of the emulsion showed the colloidal solution with a milky white color. The size of the emulsion without vitamins and with vitamins B1, B2, B12, and folate (total 100 ppm) were 70-75 nm and 74.4 -78.1 nm, respectively. This result illustrated that the emulsion was classified as glycosphingolipid microemulsion. The emulsion powder was prepared and we found that the hot air drying and spray drying methods showed a viscous liquid with an oily smell. Whereas the freeze-drying method created the form of a light yellow, odorless and fine emulsion powder. The average particle size of emulsion was 80-100 nm. The solubility test showed that the emulsion powder was able to dissolve up to 300 g/L and 450 g/L at 25°C and 70°C, respectively. The morphological analysis showed that the powder emulsion was quite spherical with a diameter of less than 100 micrometers. In a simulated digestive system test, it was found that glycosphingolipid emulsion releases all vitamins in gastric simulated fluids and simulated small intestinal fluid conditions with values greater than 80%.Item Local Production and Characterization of Biochar from Bamboo Waste and the Removal of Natural Organic Matter from Nakhon Nayok River, Thailand(Research and Development Institute Suan Dusit University, 2022) Dusit Angthararuk; Sasamol Phasuk; Pannraphat Takolpuckdee; D. Angthararuk; Faculty of Science and Technology, Valaya Alongkorn Rajabhat University under the Royal Patronage, Pathum Thani, 13180, Thailand; email: dusit_ang@dusit.ac.thThe objective of this research was to produce a biochar from bamboo handicraft waste via pyrolysis process using a modified 200 L steel drum kiln. The temperature outside the kiln-producing biochar appeared around 500-600¡C, closely related to the temperature of slow pyrolysis. The physical and chemical properties of bamboo biochar (BB) were characterized by using proximate and ultimate analysis, Brunauer-Emmett-Teller surface area techniques, elemental analysis, scanning electron microscopy coupled with an energy dispersive spectroscopy, Fourier transform infrared spectroscopy, Raman spectroscopy and X-ray diffraction techniques. It was found that 28.76 ± 2.22% of BB yield with 77.07 ± 1.92 % fixed carbon. As the morphology properties, its surface area and total pore were 247.5 ± 7.1 m2 g-1 and 0.16 ± 0.02 cm3 g-1, respectively. Batch test for removal of natural organic matter (NOM) in Nakhon Nayok River, by adsorbed on BB was studied. The results showed that the percentage reduction of dissolve organic matter (DOC) and absorbance at 254 nm at equilibrium were 71.33 ± 1.46 and 76.51 ± 2.01, respectively, while the adsorption capacity was 4.75 mg.g-1 DOC. Pseu-do-second order kinetic model was best suited for describing the adsorption of DOC onto BB. This suggests that interaction of NOM on BB were explored in terms of multicomponent adsorption, which the heterogeneous distribution of the adsorptive sites at biochar surfaces. It was found that biochar is suitable for the adsorption of NOM from surface water and is a low-cost effective adsorbent in the treatment of wastewater. Biochar can be applied for a variety of purposes for example: as biofuels, adsorbents and as soil amendments. In addition, the biochar kiln is small and easy to create, creates no smoke, inexpensive, easy to use, does not take much time to produce and has an eco-friendly processing. © 2022, Research and Development Institute Suan Dusit University. All rights reserved.Item Local Production and Characterization of Biochar from Bamboo Waste and the Removal of Natural Organic Matter from Nakhon Nayok River, Thailand(Graphicsite, 2023-09-26) Dusit Angthararuk; Sasamol Phasuk; Pannraphat TakolpuckdeeThe objective of this research was to produce a biochar from bamboo handicraft waste via pyrolysis process using a modified 200 L steel drum kiln. The temperature outside the kiln-producing biochar appeared around 500-600°C, closely related to the temperature of slow pyrolysis. The physical and chemical properties of bamboo biochar (BB) were characterized by using proximate and ultimate analysis, Brunauer-Emmett-Teller surface area techniques, elemental analysis, scanning electron microscopy coupled with an energy dispersive spectroscopy, Fourier transform infrared spectroscopy, Raman spectroscopy and X-ray diffraction techniques. It was found that 28.76 ± 2.22% of BB yield with 77.07 ± 1.92 % fixed carbon. As the morphology properties, its surface area and total pore were 247.5 ± 7.1 m2 g-1 and 0.16 ± 0.02 cm3 g-1, respectively. Batch test for removal of natural organic matter (NOM) in Nakhon Nayok River, by adsorbed on BB was studied. The results showed that the percentage reduction of dissolve organic matter (DOC) and absorbance at 254 nm at equilibrium were 71.33 ± 1.46 and 76.51 ± 2.01, respectively, while the adsorption capacity was 4.75 mg.g-1 DOC. Pseudo-second order kinetic model was best suited for describing the adsorption of DOC onto BB. This suggests that interaction of NOM on BB were explored in terms of multicomponent adsorption, which the heterogeneous distribution of the adsorptive sites at biochar surfaces. It was found that biochar is suitable for the adsorption of NOM from surface water and is a low-cost effective adsorbent in the treatment of wastewater. Biochar can be applied for a variety of purposes for example: as biofuels, adsorbents and as soil amendments. In addition, the biochar kiln is small and easy to create, creates no smoke, inexpensive, easy to use, does not take much time to produce and has an eco-friendly processing.Item Low-Cost Biochar Derived from Bamboo Waste for Removal of Heavy Metal in Aqueous Solution(Research and Development Institute Suan Dusit University, 2022) Dusit Angthararuk; Sasamol Phasuk; Pannraphat Takolpuckdee; D. Angthararuk; Faculty of Science and Technology, Valaya Alongkorn Rajabhat University under the Royal Patronage, Pathum Thani, 13180, Thailand; email: dusit_ang@dusit.ac.thThis study assessed the adsorption capacity of heavy metals such as lead (Pb), copper (Cu) and zinc (Zn) in the aqueous solution of biochar. Biochar was obtained from bamboo handicraft scraps by a pyrolysis method and was used as an economical absorbent. The bamboo biochar was characterized by scanning electron microscopy coupled with energy-dispersive x-ray spectroscopy (SEM-EDS) and attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR). The parameters such as contact time, biochar dosage, pH of the initial solution, and initial concentration of metal ions affected sorption capacity were investigated. Experiment results showed that the bamboo biochar mainly contained carbon and oxygen elements and a high number of C=O, C-O and O-H functional groups. The maximum adsorption uptake on biochar was Pb(II)>Zn(II)>Cu(II) under 1.0 g adsorbent L-1, 20 mg L-1 initial concentration of all metal ions, pH 4, contact time 120 min and at ambient temperature. From Langmuir isotherm fitting showed the maximum adsorption capacity was 41.15, 30.21 and 34.48 mg g-1 for Pb(II), Cu(II), and Zn(II), respectively. Pseudo-second order kinetic model can best describe the adsorption process of all ions in solution mainly via monolayer adsorption onto a homogeneous adsorbent surface and chemisorption as ion exchange, complexation, and surface mineral precipitation of metal ions. Appling the bamboo biochar for the removal of metal ions in groundwater found it was able to eliminate manganese at more than 95% within an hour of contact time. All research findings suggest that bamboo biochar has broad potential for water purification applications. © 2022, Research and Development Institute Suan Dusit University. All rights reserved.Item Photo-catalysis of bromacil under simulated solar light using Au/TiO2: evaluation of main degradation products and toxicity implications(Springer Verlag, 2015) Dusit Angthararuk; Pakawadee Sutthivaiyakit; Christian Blaise; Fran�ois Gagn�; Somyote Sutthivaiyakit; P. Sutthivaiyakit; Department of Chemistry and Center of Excellence for Innovation in Chemistry, Kasetsart University, Bangkok, 10903, Thailand; email: fscipws@ku.ac.thBromacil (5-bromo-3-sec-butyl-6-methyluracil) is a substituted uracil herbicide used worldwide. It is not readily biodegradable and has the potential to contaminate different types of water bodies with possible impact on diverse non-target species. In this work, degradation of bromacil in aqueous Au/TiO2 suspension under simulated sunlight allowed fourteen degradation products to be identified. The photodegradation of bromacil followed (pseudo) first order kinetics in the presence of 0.2�g�L_1 of Au/TiO2 with a half-life of 25.66 � 1.60�min and a rate constant of 0.0271 � 0.0023�min_1. Transformation routes of the photo-catalytic degradation of bromacil were then proposed. Complementary toxicity assessment of the treated bromacil solution revealed a marked decrease in toxicity, thereby confirming that by-products formed would be less harmful from an environmental point of view. Photo-catalytic degradation of bromacil thus appears to hold promise as a cost-effective treatment technology to diminish the presence of this herbicide in aquatic systems. � 2014, Springer-Verlag Berlin Heidelberg.Item Study of pH Changes of Rice and Suitable Condition of Mixed Indicator Solution for Developing a Simple Rice Age Test Kit(The Journal of KMUTNB, 2023) Kittisak Wasantiwong; Rungtiwa Wongsagonsup; Dusit Angthararuk; Jeerun KingkaewRice grains encounter the changes of physicochemical properties along the storage periods, thus affecting the cooking and eating properties. This research aims to study the pH changes of stored rice cultivars during different storage times and to find the suitable condition of mixed indicator solution between Methyl red and Bromothymol blue for developing a simple test kit for age estimation of stored rice. The rice cultivars used were RD 6, Khao Dawk Mali 105, and Phitsanulok 2, which were stored for 0–12 months at room temperature. The results showed that for rice with increasing storage time, pH value of rice decreased. The pH of RD 6, Khao Dawk Mali 105, and Phitsanulok 2 rice cultivars decreased from 6.82–6.45, from 7.09 to 6.45 and from 7.03–6.49, respectively. The color of the mixed indicator solution changed according to the pH value of phosphate buffer (pH 5.8–7.2). The suitable condition giving the most obvious color differences in pH 5.8-7.2 of mixed indicator solution between Methyl red and Bromothymol blue was at ratio of 60 : 40 and volume of 0.30 ml. When the stored rice samples of varying ages were tested with the optimum mixed indicator solution, the solution color changed from green to yellow and orange with the increasing storage times of rice. This can be used for developing a simple test kit for age estimation of stored rice and would also solve the problem of adulteration of fresh and aged rice.