Kongtragoul, Pornprapa
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Preferred name
Kongtragoul, Pornprapa
Alternative Name
Kongtragoul, P.
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Email
pornprapa.ko@kmitl.ac.th
20 results
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Item type:Publication, Top-spray fluidization coating of paddy rice with zinc oxide nanoparticles to reduce infection from Aspergillus sp(2020-10-01); Junka, NittayaThe aim of this study was to reduce infection of paddy rice from Aspergillus sp. by coating with zinc oxide nanoparticles (ZnO NPs) solution in a top-spray fluidization coater, while maintaining the important qualities. The nozzle height and the atomized pressure affected the final moisture content of the coated paddy rice. When the final moisture content decreased lower than 13.0% (d.b.), this resulted in a drastic decrease in the husking percentage. Analysis of the crystallinity structure using X-ray diffractometry could indicate the amount of ZnO NPs coated to the paddy rice surface under appropriate coating conditions. The atomization of the ZnO NPs solution through a nozzle at 35 cm height, a pressure of 3.5 bar, and a concentration of 7.7 g/kg were the optimal conditions for complete inhibition of fungal growth while maintaining the important qualities of paddy rice. Practical applications: Fungi can infect paddy rice at any stage from the planting process through growth, harvest, and storage, and cause low quality produce. This research studied the application of a top-spray fluidization technique and the benefits of coating paddy rice with ZnO NPs to inhibit Aspergillus sp. during storage. The application of a top-spray fluidization technique can maintain the final moisture content of paddy rice without exceeding the equilibrium, rendering the paddy rice suitable for packing for transport, or storage directly after the coating procedure. The data obtained from this research can determine the most appropriate coating conditions and this coating system can be employed in rice community enterprises, cooperatives, or factories. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Antifungal copper nanocomposite-rubber compound for tree wound dressings(2024-12-15); Phengdaam, ApichatThis study combines copper nanoparticles (CuNPs) with a rubber compound to develop a tree wound dressing that reduces tree mortality from infections, utilizing broad-spectrum antifungal and adhesive properties of composite material. Phytotoxicities of CuNPs with an average size of 6 nm were significantly lower than those of Cu ions, evaluated by the germination index using lettuce seeds and membrane integrity index using stems of rubber seedling. After that, the synthesized CuNPs were then loaded into a natural rubber (NR) latex compound at concentrations ranging from 0 to 90 mg/L to produce a CuNP composite adhesive. The shear strength, representing adhesion on wood, was evaluated using lap shear testing, revealing a 50 % reduction in maximum force at the highest CuNP loading. This loss of shear strength was attributed to interference by copper ions in the vulcanization of the NR latex compound, as indicated by FT-IR spectroscopy. After that, the CuNP composite adhesive was formed into a film to test antifungal properties against Colletotrichum spp. Based on the in vitro plate inhibition zone assay, 10 mg/L of CuNPs inhibited the growth of Colletotrichum spp. The size of inhibited zone was significantly increased by 150 and 300 % when concentrations of CuNPs were 70 and 90 mg/L, respectively. This research provides the first evidence of the low phytotoxicity of CuNPs compared to copper ions at equivalent concentrations and demonstrates the efficacy of CuNP composites with NR compounds as tree wound dressings. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, In vitro fungicidal effect of chitosan with different molecular weights on fungicide-resistant Phytophthora fruit rot on durian from the export market(2018-08-30)Fruit rots of durian were collected from the export market in Chumphon province, Thailand. The causal organism, Phytophthora spp. was isolated on PAR(PH)-V8 selective medium by tissue transplanting technique. Resistance to dimethomorph, fosetyl-Al, metalaxyl and mancozeb was detected from the mycelial growth on V8 agar amended with fungicide. Multiple fungicide resistant (Mu-F<sup>HR</sup>) and sensitive (Mu-F<sup>S</sup>) isolates are used to study the fungicidal effect of chitosan with different molecular weights. The low, medium and high molecular weight chitosan at 0 (control), 500, 1,000 and 2,000 ppm were evaluated for the development of Mu-FHR and Mu-FS isolates on mycelial growth by poisoned food technique and on sporangium production and zoospores release by culture disc technique. The results indicated that the fungicidal effect of three types of chitosan strengthened as the concentration of chitosan increased for mycelial and sporangium inhibition. However, all chitosan treatments were not significant in zoospores release. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Sensitivity tests of dimethomorph, ethaboxam and etridiazole on Phytophthora palmivora causing stem rot and leaf blight of durian in eastern Thailand(2023-01-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Isolates of Colletotrichum truncatum with Resistance to Multiple Fungicides from Soybean in Northern Thailand(2023-09-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Cross-Resistance to Benzimidazole Group and Mancozeb Fungicides in Colletotrichum spp. Causing Anthracnose Disease(2022-10-01); 1 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, EFFECT OF ZINC OXIDE NANOPARTICLES AGAINST PHYTOPHTHORA SPP. CAUSING DURIAN DISEASES IN VITRO(2024-01-01); ; Pantakan, SansaneeThe efficiency of zinc oxide nanoparticles (ZnO-NPs) in inhibiting Phytophthora spp. growth in both durian fruits and stems is demonstrated. The size of ZnO-NPs used was in range of 25-50 nm in diameter. Diseased durian sample were collected from a durian orchard located in southern of Thailand. The pathogen of diseased durian was isolated for subsequent morphological identification. Three distinct strains of Phytophthora spp. (designated as PHY41, PHY45, PHY49) were successfully isolated and were found in colonies with rings and stellate pattern, ovoid, limoniform sporangium with semi-papillate or papillate, and formation chlamydospores. All isolates were exhibiting 100% pathogenicity on durian, as indicated by the disease incidence (DI). The concentration of ZnO-NPs played a crucial role in suppressing the growth of Phytophthora spp. in all isolates. Higher concentration of ZnO-NPs resulted in increased inhibition of growth. ZnO-NPs at the concentration of 2000 µg/mL effectively suppressed the mycelial growth of all fungi isolates at 57.76-69.84%. Additionally, ZnO-NPs at the concentration of 500 µg/mL completely inhibited the sporulation only in the PHY49 strains. Furthermore, ZnO-NPs concentration ranging from 1000-2000 µg/mL resulted in completed inhibition in sporulation in all Phytophthora spp. isolates. The result demonstrated that ZnO-NPs at all concentrations effectively delayed the germination of Phytophthora spp.2 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Synergistic effect of salicylhydroxamic acid in quinone outside inhibitor fungicides and its sensitivity on fruit rot pathogens(2024-01-01); The synergistic effect of treatment with both salicylhydroxamic acid (SHAM) and treatment with azoxystrobin (AZ), trifloxystrobin (TF), and pyraclostrobin (PR) which are present in Ool (quinone outside inhibitor) on fruit rot pathogens was investigated. Twenty-five fungal pathogen isolates were collected from chili, mango, and durian fruit rot. Ten isolates of Phytophthora palmivora were obtained from durian fruits and 15 Colletotrichum spp. were obtained from chili and mango fruits. The efficiency of SHAM interaction with AZ, TF, and PR at various concentrations to mycelial growth was statistically defined by a synergy factor (SF). A value of a SF above 1 represented the synergism of SHAM and fungicide in QoI to inhibit fungi respiration. The fungicide sensitivity was evaluated with the classification of the levels of sensitivity based on 50% effective concentrations (EC<inf>50</inf>). All tested isolates were susceptible to QoI fungicides at EC<inf>50</inf> lower than 10 mg L<sup>-1</sup>. Only one isolate of Colletotrichum sp. from chili (CC_P003) was intermediately resistant to AZ at 16.52 mg L<sup>-1</sup> EC<inf>50</inf>.1 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, In vitro assessment of crude extract from Gomphrena weed (Gomphrena celosioides Mart.) for control of plant pathogenic fungi causing chili diseases(2023-03-01); Jaenaksorn, T.The phytochemical screening of both the flowers and other aerial parts of the Gomphrena weed extract (Gomphrena celosioides Mart.) presented alkaloids, flavonoids, saponins, phenolics/tannins, and terpenoids. The extracts from both parts at 80, 160, and 240 mg/ml were significantly inhibited the mycelial growth of C. gloeosporioides and Fusarium sp. compared to inoculated control by paper disc diffusion. The extract from both parts of the Gomphrena weed at the highest concentration (160 mg/ml) significantly showed the greatest inhibitory effect on mycelial growth of Sclerotium sp. (100 percent), followed by C. gloeosporioides (82.5 percent), Cercospora sp. (41.16 percent), and Fusarium sp. (24.41 percent) when tested using the poisoned food technique. The spore germination test revealed both parts of the weed extract yielded concentrations which were completely inhibited (100 percent) on the spore germination of C. capsici, C. gloeosporioides, and Fusarium sp.2 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Low-Cost Activated Carbon for Methylene Blue Adsorption Using Inert Gas-Free Carbonization and Microwave Activation(2025-01-01); ; Choola-Aied, Orasa-This study investigated the preparation of activated carbon from spent coffee grounds for methylene blue adsorption using inert gas-free carbonization and microwave activation. Spent coffee grounds were obtained from a local coffee shop in Pathio, Chumphon, Thailand. The coffee grounds were pretreated with 1M H<inf>2</inf>SO<inf>4</inf> before undergoing carbonization at 600 ºC for 3 h in a limited-oxygen atmosphere. The obtained carbon materials were chemically activated with zinc chloride (ZnCl<inf>2</inf>) and physically activated using a microwave-assisted method at 300 W for 180 seconds. The adsorption of methylene blue was evaluated using a batch method. Methylene blue adsorption contact time, effect of pH, and initial concentration were investigated. The maximum adsorption capacity of the activated carbon for methylene blue removal was found to be 29.24 mg/g. The prepared activated carbon exhibited a BET surface area of 70.08 m<sup>2</sup>/g and reached equilibrium in 120 min at the optimum pH of 9. The adsorption isotherm was consistent with the Freundlich model, while the adsorption kinetics followed a pseudo-second-order model. The findings indicate that activated carbon is a cost-effective and efficient adsorbent for methylene blue removal from aqueous solutions.1