Browsing by Author "Kwannate Sombatsompop"

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    Anti-algal performances for biocide-enhanced low-density polyethylene film
    (2013-10-04) Atthapong Gitchaiwat; Somthida Likhitlert; Apisit Kositchaiyong; Kwannate Sombatsompop; Benjaphorn Prapagdee; Khokhwan N A Israngkura; Narongrit Sombatsompop; King Mongkuts University of Technology Thonburi; King Mongkut's University of Technology North Bangkok; Mahidol University; Koventure Co.
    In this work, low-Density Polyethylene (LDPE) films incorporated with 2-methylthio-4- ethylamino-6-tert.butylamino-triazin-1,3,5, or Terbutryn (TT) was used as anti-algal agent, at different concentrations were evaluated for anti-algal performances. Clear zone test and chlorophyll a measurement method were used for anti-algal evaluations against Chlorella vulgaris (TISTR 8580) and Phormidium angustissimum (TISTR 8979) as testing algae. Mechanical properties and surface color changes of LDPE were also observed for the effect of algaecide addition. It was found that addition of TT in the LDPE specimen did not significantly alter the tensile strength, tensile elongation and toughness properties of materials. For anti-algal test, it should be noted that the greater clear zone area (clear zone test) or smaller chlorophyll a content (chlorophyll a measurement method) the better anti-algal activities. It was found that the clear zone of the TT filled LDPE sample was observed with C. vulgaris but was not seen with P. angustissimum. When the TT concentration in LDPE was greater than 600 ppm, the C. vulgaris did not grow. © (2013) Trans Tech Publications, Switzerland.
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    Assessment and characterization of antifungal and antialgal performances for biocide-enhanced linear low-density polyethylene
    (2013-04-05) Atthapong Gitchaiwat; Apisit Kositchaiyong; Kwannate Sombatsompop; Benjaphorn Prapagdee; Khokhwan Isarangkura; Narongrit Sombatsompop; King Mongkuts University of Technology Thonburi; King Mongkut's University of Technology North Bangkok; Faculty of Environment and Resource Studies, Mahidol University; Ltd.
    In this work, four biocides were used for the purpose of growth inhibition of fungi and algae in linear low-density polyethylene (LLDPE) specimens. Benzimidazol-2-yl-carbamicacid methyl ester [carbendazim (CB)], 5-chloro-2-(2,4-dichlorophenoxy)phenol [triclosan (TS)], and 3-iodo-2-propynyl N-butylcarbamate [iodopropynyl butylcarbamate (IPBC)] were used as antifungal agents, and 2-methylthio-4-ethylamino-6-tert-butylamino-triazin-1,3,5 [terbutryn (TT)] was used as an antialgal agent. Antifungal performance was evaluated by disk diffusion and dry weight techniques, and antialgal activities were carried out by disk diffusion and chlorophyll A methods. Aspergillus niger TISTR 3245 and Chlorella vulgaris TISTR 8580 were used as the testing fungus and alga, respectively. The experimental results suggested that the wettabilities of LLDPE specimens changed with the incorporation of CB, TS, IPBC, and TT biocides without significant changes in chemical structures and mechanical properties of the LLDPE. IPBC with the recommended content of 10,000 ppm was found to give the most satisfactory growth inhibition of A. niger. Antifungal performance evaluations were dependent on the testing methods used, whereas those for antialgal activity were not. The optimum concentration of TT agent for effective killing of C. vulgaris was 750 ppm; this loading could be reduced from 750 to 250 ppm by the addition of either TS or IPBC agent. TS and IPBC could be used as antialgal promoters in the LLDPE specimens. © 2012 Wiley Periodicals, Inc.