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Author: search.filters.author.Chodjarusawad, T.

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    The study of UV protection materials
    (2018-09-05)
    Wirunchit, S.
    ;
    Apivitcholchat, C.
    ;
    Chodjarusawad, T.
    ;
    Koetniyom, W.
    Most people are aware of how harmful UV radiation is to the skin. The sun's ultraviolet rays, UVA and UVB, are known to cause skin damage, from freckling and moles to fatal skin cancer. That's why it is important to apply sunscreen products to your skin, to help you stay sun safe and absorber harmful ultraviolet rays. This research is studied to focus on how to make UV materials to protect UV radiation. The UV absorber additive materials are 4 types; nanoZnO solid powder at size 25-50 nm (ZnO-1), nanoZnO 40%wt in ethanol solution (ZnO-2), nano TiO<inf>2</inf> solid powder at size 17-50 nm (TiO<inf>2</inf>-1) and nano TiO<inf>2</inf> solid powder 325 mesh (TiO<inf>2</inf>-2) respectively, that was mixed in pure baby lotion cream. Three concentration of UV absorber additive materials are 5, 10 and 15 % by weight were compared with pure baby lotion cream. All compositions were tested UV absorbance with UV spectroscopy together with studied micro structure of UV absorber additive materials by Field emission scanning electron microscope (FE-SEM). The techniques to confirm UV absorber materials are X-ray diffraction (XRD), Raman and Fourier transform infrared (FT-IR) spectroscopy. From these results were shown the uncertainty of each concentration of UV absorber materials because of the most of the films were not uniform dispersion and depended on the coating technique. This study evaluated the performance of ultraviolet transmission on of different materials by using a single energy light emitting diode as light source. Titanium dioxide (TiO<inf>2</inf>) and zinc oxide (ZnO) are two of most popular inorganic ultraviolet protective materials in UV protection skin care products was studied.
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    Impact of processing method and growing location on overall differences of brewed coffee using electronic tongue and sensory panel
    (2017-11-25)
    Kulapichitr, F.
    ;
    Suppavorasatit, I.
    ;
    Borompichaichartkul, C.
    ;
    Chodjarusawad, T.
    ;
    Phatthara-aneksin, A.
    Arabica coffee beans from two different locations (Doi Tung and Doi Chang, Chiang Rai, Thailand) were processed through civet cat (free-range), civet cat (caged) and normal wet processing. The beans were ground and brewed using a standard steeping method. Coffee samples were evaluated using an electronic tongue and a sensory panel for overall differences. Coffee samples from different processes and locations were clearly differentiated by the electronic tongue. Differences between the processes (civet cat (free-range), civet cat (caged) and normal wet-processing) were perceivably significant (>78% clearly detecting differences) between coffees from the same location (Doi Tung). However, when the location factor was introduced (Doi Chang vs. Doi Tung), the differences were reduced, and only civet coffee from different locations and different feeding methods (free-range vs. caged) was significantly different. Postharvest processing of coffee beans had a great impact on a cup of coffee; however, this impact seemed to be masked by the different locations.
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    Electrochemical sensor: Preparation technique based on electronic tongue in fragrance
    (2017-01-01)
    Rattanawarinchai, P.
    ;
    Krongkrachang, P.
    ;
    Chodjarusawad, T.
    ;
    Phromyothin, D.
    This research is aimed to investigate a sensing of fragrance using electronic tongue (E-tongue) based on electrochemistry by various sample preparation techniques. The E-tongue has been designed and constructed based on the pattern classification. Various fragrances have been studied to evaluate the ability of E-tongue by cyclic voltammetry (CV) and data reduction techniques by principal component analysis (PCA). In this study, a vomeronasal organ is a proposed concept for detection the odor and a medium act as a solvent to entrap the odor particles. The result indicates that this technique is able to classify samples in terms of qualitative and quantitative analysis as well.
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    A study of fluorescent chemosensor for Fe(II) based on cyanoacrylic derivatives
    (2013-10-29)
    Thanakit, P.
    ;
    Chodjarusawad, T.
    ;
    Chittratan, P.
    ;
    Pratontap, S.
    ;
    Phromyothin, D.
    A chemosensor based on a cyanoacrylic (DTP-C) consists of dithieno [3,2-b;2',3'- d]pyrrole(DTP) as a chromophore and a cyanoacrylic moiety as an ionophore which linked by aromatic system. DTP-C demonstrates the response of complex with Fe(II) in dimethylformamide (DMF) solution. The binding mode of Fe(II)/DTP-C complex was characterized using UV-Visible and fluorescence spectroscopy. In addition, the effect of various MES buffer was then studied at 5%, 10%, 15% and 20% v/v in Fe(II)/DTP-C complex which the appropriate ratiomatric of MES buffer is 10%. The enhancement of Fe(II) concentration indicate a decrease emission intensity while the addition of buffer concentrations found to increase in the intensity. Moreover, quantum chemical calculations were used to study the electronic and optical properties of the molecular structure of DTP-C under the density functional theory. © (2013) Trans Tech Publications, Switzerland.