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Photoluminescence and photonic absorbance of Ce_2(MoO_4)_3 nanocrystal synthesized by microwave-hydrothermal/solvothermal method

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Rare Metals 2018年第10期37卷 868-874页

作者： Wachiraporn Maisang Anukorn Phuruangrat Somchai Thongtem Titipun Thongtem Department of Physics and Materials Science Faculty of Science Chiang Mai University Department of Materials Science and Technology Faculty of Science Prince of Songkla University Department of Chemistry Faculty of Science Chiang Mai University Materials Science Research Center Faculty of Science Chiang Mai University

In this research, cerium （III） nitrate hexahydrate （Ce（NO3）3·6H2O） and ammonium molybdate tetrahydrate （（NH4）6Mo7O24·4H2O） with Ce3＋-to-Mo6＋ molar ratio of 2：3 were dissolved in 40 ml different solvents of deionized （DI） water, polyethylene glycol （PEG） and ethylene glycol （EG） to form different solutions which were followed by adjusting pH from the traditional values to 7.0 and 10.0 with 1 mol.L-1 sodium hydroxide （NaOH）. Subsequently, the solutions were processed by 270-W microwave-hydrother- mal/solvothermal method. Phase, morphology, vibrational modes and photonic properties were fully characterized by X-ray powder diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, Fourier transform infrared spectroscopy （FTIR）, Raman spectrophotometry, ultraviolet-visible （UV-Vis） absorption and photoluminescence （PL） spectroscopy. The as-synthe-sized products were pure cerium molybdenum oxide （Ce2（MoO4）3） of nanoparticles clustered together as nano- plates in DI water and PEG solvents, and of spindle-like nanoparticles in EG solvent, including the presence of Ce-O-H mode and MoO4 units. The results show that direct energy gaps of the first two have the same value of 2.30 eV, and that of the last is 2.80 eV, including their blue emission at the same wavelength of 488 nm.

关键词： Ce2(MoO4)3 Microwave-hydrothermal/solvothermal method X-ray diffraction Photoluminescence Energy gap

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Ultrasound-assisted Low Density Solvent Based Dispersive Liquid-liquid Microextraction for Determination of Phthalate Esters in Bottled Water Samples

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Chemical Research in Chinese Universities 2016年第2期32卷 178-183页

作者： UANSIRI Sutthirak VICHAPONG Jitlada KANCHANAMAYOON Wanna Creative Chemistry and Innovation Research Unit Department of Chemistry Faculty of Science Mahasarakham University Kantarawichai District Maha Sarakham 44150 Thailand

A technique of ultrasound-assisted low density solvent based dispersive liquid-liquid microextraction was developed for the determination of four phthalate esters, including dimethyl phthalate（DMP）, diethyl phthalate（DEP）, di-n-butyl phthalate（DnBP） and di（2-ethylhexyl） phthalate（DEHP） in bottled water samples. A low density solvent, toluene, was selected as extraction solvent. In the extraction process, a mixture of 15 μL of toluene（extraction solvent） and 100 μL of methanol（disperser solvent） was rapidly injected into 1.0 mL of water samples. A cloudy solution was formed after ultrasounded for 5 min, and then centrifuged at 5000 r/min for 5 min. The enriched analytes in the floa- ting phase were determined by means of gas chromatograph. Under the optimum conditions, the enrichment factors were found to be in a range of 29--67, and the recoveries were ranged from 81.2% to 103.9%. The limits of the detection were in a range of 3.8--5.6 μg/L. The proposed method was applied to the extraction and determination of phthalate esters in bottled water samples, and the concentrations of phthalate esters found in the water samples were below the allowable levels.

关键词： Phthalate ester Sample extraction Gas chromatography Drinking water Ultrasound-assisted method

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Comparison of forage yield,silage fermentative quality,anthocyanin stability,antioxidant activity,and in vitro rumen fermentation of anthocyanin-rich purple corn(Zea mays L.) stover and sticky corn stover

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Journal of Integrative Agriculture 2018年第9期17卷 2082-2095页

作者： TIAN Xing-zhou Pramote Paengkoum Siwaporn Paengkoum Sorasak Thongpea BAN Chao School of Animal Production Technology Institute of Agricultural Technology Suranaree University of Technology Program in Agriculture Faculty of Science and Technology Nakhon Ratchasima Rajabhat University

The objective of this study was to observe the forage yield, silage fermentative quality, anthocyanin stability, and antioxidant activity during the storage period and in vitro rumen fermentation of anthocyanin-rich purple corn （Zea mays L.） stover （PS） and sticky corn stover （SS）. Forage yield of corn stover was weighed and ensiled with two treatments：（1） hybrid sticky waxy corn stover （control）, and （2） hybrid purple waxy corn stover （treatment）. Samples were stored in mini-silos for periods of 0, 7, 14, 21,42, 63, 84, and 105 d. The results showed that PS had significantly higher （P〈0.05） yields of dry matter （DM）, organic matter （OM）, gross energy （GE）, crude protein （CP）, neutral detergent fiber （NDF）, acid detergent fiber （ADF）, and total anthocyanins than that of the SS. Anthocyanin-rich purple corn stover silage （PSS） showed higher （P〈0.05） levels of DM and CP relative to the sticky corn stover silage （SSS）. Although anthocyanin-rich PSS displayed a lower （P〈0.05） level of pelargonidin-3-glucoside （P3G）, it had higher （P〈0.05） levels of peonidin （Peo） and pelargonidin （Pel） compared to the control. Delphinidin （Del） and malvidin （Mal） were not detected in SSS during the ensilage period; in PSS, Del was no longer detected after 7 d of ensilage. Specifically, total anthocyanins in anthocyanin-rich PSS decreased rapidly （P〈0.05） prior to 7 d of ensilage, and then remained at relatively stable （P〉0.05） constants. Compared to the anthocyanin-rich PSS, SSS displayed significantly higher （P〈0.05） pH value and ammonia nitrogen （NH3-N） content. Propionic acid （PA） at 0 d and butyric acid （BA） during the entire study period were not detected, whereas anthocyanin-rich PSS showed a higher （P〈0.05） level of lactic acid （LA） than that of the SSS. Compared with the SSS extract, anthocyanin-rich PSS extract showed a higher （P〈0.05） level of 2,2-diphenyl-1-picryihydrazyl （DPPH） scavenging activity and displayed a lower （P〈0.05） half maximal inhibitory concentration （IC50） v

关键词： anthocyanin-rich purple corn stover silage anthocyanin stability silage fermentative quality antioxidant activity rumen fermentation

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Convective heat transfer of nanofluids with correlations

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Particuology 2011年第6期9卷 626-631页

作者： Lazarus Godson Asirvatham Balakrishnan Raja Dhasan Mohan Lal Somchai Wongwises R&AC Division Department of Mechanical Engineering College of Engineering Guindy Anna University Indian Institute of Information Technology Design and Manufacturing (IIITD&M)-Kancheepuram Fluid Mechanics Thermal Engineering and Multiphase Flow Research Lab (FUTURE) Department of Mechanical Engineering King Mongkut's University of Technology Thonburi The Academy of Science The Royal Institute of Thailand

To investigate the convective heat transfer of nanofluids, experiments were performed using silver-water nanofluids under laminar, transition and turbulent flow regimes in a horizontal 4.3 mm inner-diameter tube-in-tube counter-current heat transfer test section. The volume concentration of the nanoparticles varied from 0.3% to 0.9% in steps of 0.3%, and the effects of thermo-physical properties, inlet temperature, volume concentration, and mass flow rate on heat transfer coefficient were investigated. Experiments showed that the suspended nanoparticles remarkably increased the convective heat transfer coefficient, by as much as 28.7% and 69.3% for 0.3% and 0.9% of silver content, respectively. Based on the experimental results a correlation was developed to predict the Nusselt number of the silver-water nanofluid, with ＋10% agreement between experiments and prediction.

关键词： Convective heat transfer Silver Nanofluid Correlation Laminar Turbulent Transition

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Characteristics and properties of goat meat gels and balls as affected by setting conditions

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Food Quality and Safety 2019年第2期3卷 129-136页

作者： Sulaiman Mad-Ali Soottawat Benjakul Department of Food Technology Faculty of Agro-IndustryPrince of Songkla UniversityHat YaiSongkhlaThailand

The properties of goat meat gels without and with 120 mmol/kg CaCl_(2)as influenced by setting time(30-120 min)at 60℃ were studied.A gel set for 60 min with subsequent cooking for 20 min in the presence of CaCl_(2)had the highest breaking force and deformation with coincidentally lowest expressible moisture content(P0.05).A decrease in the myosin heavy-chain band intensity was noticeable when CaCl_(2)was incorporated,suggesting increased protein *** setting time increased,the L*values increased with varying a*values,whereas no differences in b*values of gels were found,regardless of CaCl_(2)addition(P>0.05).The gel containing CaCl_(2)with setting time of 60 min had the highest hardness,cohesiveness,gumminess,and chewiness(Phigher texture and overall likeness scores,compared with the control(P<0.05).Therefore,prior setting at 60℃ for 60 min in the presence of CaCl_(2)is recommended for the manufacture of goat meat balls with improved quality.

关键词： characteristic gel goat meat setting meat ball calcium chloride

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Effects of Experimental Conditions and Kinetics of Photodegradation of Methylene Blue over TiO2

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Chemical Research in Chinese Universities 2014年第1期30卷 149-156页

作者： WIDCHAYA Radchatawedchakoon ARAYA Thapol RATCHANEEKORN Wanchanthuek Center of Excellence for Innovation in Chemistry and Department of Chemistry Faculty of Science Mahasarakham University Mahasarakham 44150 Thailand

The authors investigated the catalytic activity of TiO2 for methylene blue（MB） degradation under solar *** reaction parameters such as reaction time,TiO2 content,temperature,pH,MB concentration and light irradiation were in ***,the experimental data was analyzed to investigate the adsorption order and adsorption *** results indicate that the optimum conditions for the removal of MB are a TiO2 content of 0.5 g/L,0.50 mg/L MB solution,a temperature of 30 ℃ and reaction time of 60 *** was found that the amount of MB removal was decreased when the pH and temperature *** suggests that the removal process is ***,the solar light irradiation plays a vital role in enhancing the removal amount of *** the dark reaction,the ability of TiO2 to remove MB was increased when the pH *** kinetics studies confirm that the adsorption of MB is the *** the adsorption model was fitted with the Freundlich isotherm.

关键词： Methylene blue Photodegradation Kinetic TiO2

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Antioxidant activities and phytochemical constituents of Antidesma thwaitesianum Müll. Arg. leaf extracts

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Journal of Integrative Medicine 2017年第4期15卷 310-319页

作者： Bhanuz Dechayont Arunporn Itharat Pathompong Phuaklee Jitpisute Chunthorng-Orn Thana Juckmeta Nuntika Prommee Nitra Nuengchamnong Pintusorn Hansakul Department of Applied Thai Traditional Medicine Faculty of Medicine Thammasat University Center of Excellence in Applied Thai Traditional Medicine Research Thammasat University Division of Applied Thai Traditional Medicine Faculty of Public Health Naresuan University Science Laboratory Centre Faculty of Science Naresuan University Department of Preclinical Science Faculty of Medicine Thammasat University

OBJECTIVE： To investigate the antioxidant activities as well as phytochemical constituents of Antidesma thwaitesianum Mull. Arg. leaf extracts. METHODS： The leaves of A. thwaitesianum were extracted using three different methods： blending with distilled water, maceration with ethanol and decoction. The chemical antioxidant activity of the plant leaf extracts was evaluated using 2,2-diphenyl-1-picryhydrazyl （DPPH） radical and 2,2＇-azinobis（3- ethylbenzo-thiazoline-6-sulfonic acid） diammonium salt （ABTS＊） radical scavenging assays, as well as the ferric reducing antioxidant power assay. Cellular antioxidant activity was determined by superoxide and nitric oxide scavenging assays. The cytotoxicity of the leaf extracts in RAW 264.7 and differentiated HL-60 cells was tested in parallel using 3-（4,5-dimethyl-2-thiazolyl）-2,5-diphenyl-2H-tetrazolium bromide and 3-（4,5-dimethylthiazol-2-yl）-5-（3-carboxymethoxyphenyl）-2-（4-sulfophenyl）-2H-tetrazolium assays, respectively. The total phenolic and flavonoid contents were also assessed by spectrophotometric analysis Phytochemical constituents of the most potent extract were investigated by liquid chromatography with an electrospray ionization quadrupole time-of-flight mass spectrometer （LC-ESI-QTOF-MS/MS）. RESULTS： The ethanolic （ME） and decoction （LW） extracts of dried leaves had the highest chemical scavenging activity against DPPH and ABTS＋ free radicals with half maximal effective concentration （EC50） values ranging from 3.54 to 6.44 μg/mL. ME and LW exerted moderate ferric reducing activity, with ferric reducing antioxidant power values of 847.41 and 941.26 mg Fe2＋/g extract, respectively. Similarly, ME showed potent cellular scavenging activity against superoxide and nitric oxide radicals with EC50 values of 58.12 and 71.90 μg/mL, respectively. However, LW exhibited only strong nitric oxide scavenging activity with an EC50 value of 91.20 μg/mL. The cell viability of RAW 264.7 and HL-60 cells was greater than 70% in all tes

关键词： Antidesma thwaitesianum Mull. Arg. antioxidants phytochemicals spectrometry, mass,electrospray ionization chromatography, liquid

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Ecology of Pinnidae(Mollusca: Bivalvia) from the Gulf of Thailand

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Acta Oceanologica Sinica 2019年第2期38卷 52-69页

作者： Cheewarat Printrakoon Peter D Roopnarine Thamasak Yeemin Animal Systematic Special Unit Department of ZoologyFaculty of ScienceKasetsart University Department of Invertebrate Zoology and Geology California Academy of Sciences Department of Biology Faculty of ScienceRamkhamhaeng University

The ecology of the family Pinnidae was studied by sampling three pinnid species from 36 sampling sites across four different microhabitats in the Gulf of Thailand. The species spatial distributions were mostly uniform, with some populations having random distributions. Species abundances differed between sandy and coral habitats according to non-metric multi-dimension scaling analyses. Although the Gulf of Thailand is a relatively small geographic area, habitats are varied enough to provide variable shell densities. Small islands are important distribution areas, and coral reefs provide both direct and indirect shelter which support high abundances,densities and increased shell size. The highest density was recorded in sand beds within coral reefs. Low density and small shell size in sand beaches might be related to high mortality in shallow water or to adaptations for survival in shallow waters. A clear correlation between sediment composition and species abundance was found in Pinna atropurpurea; abundance increased with the sand content of the sediment. For P. deltodes, abundance increased as the rock fraction of the sediment increased. These results suggest that adaptations in Pinnidae, such as shell size, shell morphology, and the exposure of the shell above the sediment-water interface, are responses for survival in different habitats.

关键词： density distribution pinnid shell shell adaptation the Gulf of Thailand

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Synergistic Effects of the ZnCl_2-SiCl_4 Modified TiCl_4/MgCl_2/THF Catalytic System on Ethylene/1-Hexene and Ethylene/1-Octene Copolymerizations

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Chinese Journal of Polymer Science 2014年第1期32卷 84-91页

作者： Wanna Phiwkliang Bunjerd Jongsomjit Piyasan Praserthdam Center of Excellence on Catalysis and Catalytic Reaction Engineering Department of Chemical Engineering Faculty of Engineering Chulalongkorn University

The copolymerizations of ethylene with 1-hexene or 1-0ctene by using TiC14/MgCI2/THF catalysts modified with different metal halide additives （ZnCI2, SIC14, and the combined ZnC12-SiCl4） were investigated based on catalytic activity and copolymer properties. It was found that the catalyst modified with mixed ZnC12-SiC14 revealed the highest activities for both ethylene/1-hexene and ethylene/1-0ctene copolymerization. The increase in activities was due to the formation of acidic sites by modifying the catalysts with Lewis acids. Based on the FTIR measurements, the characteristic C--O--C peaks of the catalysts modified with metal halide additives were slightly shifted to lower wavenumber when compared to the unmodified catalyst. This showed that the modified catalysts could generate more acid sites in the TiC14/MgC12/THF catalytic system leading to an increase in activities as well as comonomer insertion （as proven by IaC-NMR）. However, Lewis acid- modifications did not affect the microstructure of the copolymers obtained. By comparison on the properties of copolymers prepared with the unmodified catalyst, it was found that polymers with ZnC12 and/or SIC14 modification exhibited a slight decrease in melting temperature, crystallinity and density. It is suggested that these results were obtained based on the different amount of ct-olefins insertion, regardless of the types of Lewis acids and comonomer.

关键词： Ziegler-Natta catalyst Lewis acid Copolymerization of ethylene with a-olefin SIC14 ZnC12.

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Stability of freeze-dried pH-responsive dextrin nanogels containing doxorubicin

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Asian Journal of Pharmaceutical Sciences 2016年第5期11卷 648-654页

作者： Somkamol Manchun Crispin R.Dass Pornsak Sriamornsak Department of Pharmaceutical Technology Faculty of PharmacySilpakorn UniversityNakhon Pathom 73000Thailand Pharmaceutical Biopolymer Group(PBiG) Faculty of PharmacySilpakorn UniversityNakhon Pathom 73000Thailand School of Pharmacy Faculty of Health SciencesCurtin UniversityPerth 6845Australia Curtin Health Innovation Research Institute of Ageing and Chronic Disease Bentley 6102Australia

Induction of non-specific toxicities by doxorubicin(DOX) has restricted conventional DOXbased chemotherapy. p H-responsive dextrin nanogels(DNGs) have been fabricated in order to incorporate and deliver DOX to specific(targeted) sites. However, adequate stability studies of DOX-loaded DNGs are required for selection of storage conditions. The aim of this study was therefore to evaluate the accelerated(25 °C/60% RH) and long-term(5 °C) stability of DNGs prepared with formaldehyde(FDNGs) and glyoxal(GDNGs) as cross-linker by determining the change in their physicochemical properties. The mean diameter decreased with time during long-term storage. The drug content between freshly prepared(initial day) and after storage at 5 °C for 180 days of DOX-loaded FDNGs and DOX-loaded GDNGs was not significantly different(p > 0.05), but decreased after storage under the accelerated condition. The release of DOX from all DNGs was pH-dependent. However, DNGs kept under the accelerated condition showed higher amount of DOX release than those stored at 5 °C and the freshly prepared ones. The results indicate that the stability of DNGs could be improved by their storage at 5 °C.

关键词： Stability Nanogels Dextrin

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