RSO: Journal Articles

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    Antioxidant and tyrosinase inhibitory activity of mango seed kernel by product
    (Scopus, 2009)
    Maisuthisakul, P.
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    Gordon, M.H.
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    School of Science and Technology
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    University of the Thai Chamber of Commerce. Research Support Office
    The antioxidant and tyrosinase inhibitory properties of extracts of mango seed kernel (Mangifera indica L.), which is normally discarded when the fruit is processed, were studied. Extracts contained phenolic components by a high antioxidant activity, which was assessed in homogeneous solution by the 2,2diphenyl1picrylhydrazylradical and 2,2′azinobis (3ethylbenzothialozinesulfonicacid) radical cationscavenging assays and in an emulsion with the ferric thiocyanate test. The extracts also possessed tyrosinase inhibitory activity. Drying conditions and extraction solvent were varied, and optimum conditions for preparation of mango seed kernel extract were found to be sundrying with ethanol extraction at room temperature. Refluxing in acidified ethanol gave an increase in yield and the obtained extract had the highest content of total phenolics, and also was the most effective antioxidant with the highest radicalscavenging,metalchelating and tyrosinaseinhibitory activity. The extracts did not cause acute irritation of rabbit skins. Our study for the first time reveals the high total phenol content, radicalscavenging,metalchelating and tyrosinase inhibitory activities of the extract from mango seed kernel. This extract may be suitable for use in food, cosmetic, nutraceutical and pharmaceutical applications.
      2  109
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    Quality of reducedfat chiffon cakes prepared with erythritolsucralose as replacement for sugar
    (Scopus, 2009)
    อดิศักดิ์ เอกโสวรรณ
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    School of Science and Technology
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    University of the Thai Chamber of Commerce. Research Support Office
    Quality characteristics of reducedfat chiffon cakes containing 0, 25, 50, 75 and 100% erytthritolsucraloseas sugar replacement were carried out. Specific volume decreased (p<0.05) with increased sugar replacement, but weight loss and water activity increased (p<0.05). The 100% erytthritolsucralose cake produced darker colour crumb, more cohesive and adhesive and less springy in relation to those of the control cake. Results from sensory evaluation also showed significant differences in all attributes for any cakes. The cakes with higher levels of erytthritolsucralose content became darker crumb, more moist and less tender and sweet than those with sugar. Total caloric value reduction in 50% erytthritolsucralose cake was about 21.3% in relation to 100 g of the standard cake.
      8  17
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    Surface cleaning of metal wire by atmospheric pressure plasma
    (Scopus, 2009)
    Nakamura, T.
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    Buttapeng, C.
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    Furuya, S.
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    Harada, N.
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    University of the Thai Chamber of Commerce. Research Support Office
    In this study, the possible application of atmospheric pressure dielectric barrier discharge plasma for the annealing of metallic wire is examined and presented. The main purpose of the current study is to examine the surface cleaning effect for a cylindrical object by atmospheric pressure plasma. The experimental setup consists of a gas tank, plasma reactor, and power supply with control panel. The gas assists in the generation of plasma. Copper wire was used as an experimental cylindrical object. This copper wire was irradiated with the plasma, and the cleaning effect was confirmed. The result showed that it is possible to remove the tarnish which exists on the copper wire surface. The experiment reveals that atmospheric pressure plasma is usablefor the surface cleaning of metal wire. However, it is necessary to examine the method for preventing oxidization of the copper wire.
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    Group divisible designs with two associate classes and λ2 = 2
    (Scopus, 2009)
    Uiyyasathian, C.
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    Lapchinda, W.
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    University of the Thai Chamber of Commerce. Research Support Office
    A group divisible design GDD(v, g, κ, λ1, λ2) is a collection of λsubsets (called blocks) of a vset of symbols where the vset is divided into g groups: each pair of symbols from the same group occurs in exactly λ1 blocks, and each pair of symbols from different groups occurs in exactly λ2 blocks. Here, we focus on an existence problem of GDDs with two associate classes orwhen g = 2, and with blocks of size 3, when the required designs have two groups of unequal sizes and λ2 = 2. We obtain the necessary conditions and prove that these conditions are sufficient.
      3  11