Browsing by Author "Wittawat Ratanathavorn"

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    Antioxidant and anti-aging enzyme activities of bioactive compounds isolated from selected Zingiberaceae plants
    (Kasetsart University, 2021) Rittipun Rungruang; Wittawat Ratanathavorn; Nattaporn Boohuad; Orrapun Selamassakul; Nattapon Kaisangsri; R. Rungruang; Department of Cosmetic Science, Faculty of Science and Technology, Suan Dusit University, Bangkok, 10700, Thailand; email: rittipun_run@dusit.ac.th
    Bioactive compounds and antioxidant and enzyme inhibition activity levels were evaluated for three plants in the Zingiberaceae family in Thailand. Quantification of the phenolic and curcumin contents revealed that the largest component of all extracts was phenolic compounds (213.16-317.64 mg/g extract). The major curcuminoids in Curcuma longa L., Curcuma aromatica Salisb. and Zingiber montanum (J.Koenig) Link ex A.Dietr. were bisdemethoxycurcumin (BDMC; 27.31 mg/g extract), curcumin (16.59 mg/g extract), and curcumin (0.12 mg/g extract), respectively. The extracts from C. longa, C. aromatica and Z. montanum all showed antioxidant activity that was assessed using 1,1-diphenyl-2-picrylhydrazyl radical 2,2-diphenyl-1-(2,4,6-trinitrophenyl) hydrazyl (DPPH¥) and 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS¥+) radical scavenging assay. In addition, all extracts had copper chelating activity of more than 50%, with the extract from C. longa having the highest chelating activity (76.45%). All extracts from the three plants inhibited tyrosinase and elastase activity with half maximal inhibitory concentration values of 290.33-1,373.68 µg/mL and 69.61-3386.23 µg/mL, respectively. In addition, collagenase inhibition activity was observed in all extracts. The findings from this study showed that extracts from C. longa, C. aromatica and Z. montanum have potential antioxidant activity and can act as anti-tyrosinase, anti-collagenase and anti-elastase agents. The extracts could be further applied in cosmeceuticals as an active ingredient for anti-aging products. © 2021 Elsevier B.V.. All rights reserved.
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    Bio-Oil Production from Liquid-Phase Pyrolysis of Giant Leucaena Wood
    (Springer Science and Business Media, LLC, 2016) Wittawat Ratanathavorn; Chonlawit Borwornwongpitak; Chanatip Samart; Prasert Reubroycharoen; P. Reubroycharoen; Chulalongkorn University, Bangkok, Thailand; email: prasert.r@chula.ac.th
    Bio-oil production from giant leucaena wood was performed by liquid-phase pyrolysis in the presence of decane as the solvent. Three different types of catalyst (ZSM-5, NiMo/Al2O3 and Pt/Al2O3) were evaluated in terms of the bio-oil production yield and quality in an autoclave reactor at a reaction temperature of 350�C and initial hydrogen (H2) pressure of 1 MPa with decane as the solvent. Although the yield was not significantly affected by the catalyst type, CHN analysis revealed that the NiMo/Al2O3 catalysts yielded bio-oil with the lowest oxygen content (10.0 wt. %) in 4.30 wt. % yield so that it was selected as the optimal catalyst. Optimization of the reaction temperature (at 250, 300, 350, and 400�C) and the initial H2 pressure (at 0.5, 1, 2, and 3 MPa) by sequential univariate analysis revealed that the reaction temperature had the greatest influence on the oil yield and oxygen content, reaching a yield of 8.60 wt. % with the lowest oxygen content of 8.50 % at 400�C. Increasing the initial H2 pressure diminished only slightly the oil and char yield and decreased the gas yield. � 2016, Springer Science+Business Media New York.
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    Effect of sludge from water treatment plant on properties of pottery
    (Trans Tech Publications Ltd, 2014) Sutas Janbuala; Wittawat Ratanathavorn; Mana Aermbua; Arpapan Satayavibul; Udomsak Kitthawee
    This research aims to study the effect of sludge from water treatment plants on the properties of pottery such as density, compressive strength, water absorption, and porosity.The composition of sludge from water treatment plants added to the clay varies, at percentages of 0%, 10%, 20%, 30%, 40%, and 50%, controlled by weight. The results showed that the composition of 10% by weight of sludge from the water treatment plant yields the ultimate pottery properties, with 12.63 MPa of compressive strength, 1.85 g/cm3 of density, 14.24% of water absorption, and 26.34% of porosity. © (2014) Trans Tech Publications, Switzerland.