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    Effects of modulated concentration of ZnO nanoparticles on enhancing biosynthesis of metabolites and protecting plant membrane
    (2019-01-01)
    Chayaprasert, Wilailack
    ;
    Sompornpailin, Kanokporn
    Nowadays, nanoparticles are raising their applications around the world. ZnO nanoparticles are extensively used in the industrial and agricultural processes because of low price and less toxicity. Nevertheless, the pros and cons, effects of ZnO nanoparticles are still under discussing. This research aimed to study the protective effects of ZnO nanoparticles on plant physiology at the cellular level by analyzing biomaterial levels in relation to the stability of cellular membranes. Shoots of wild type and tt8 transgenic tobaccos were grown under tissue culture condition in the medium, adding 0, 10, 20 mg/L ZnO nanoparticles. Under media conditions adding 10, 20 mg/L ZnO nanoparticles, tobacco increased accumulation of plant metabolites (total soluble sugar and flavonoids). In these ZnO conditions, wild type and transgenic tobaccos enhanced total soluble sugar about 30-50% and 20-30%, respectively. The highest content of total soluble sugar was found in 20 mg/L ZnO nanoparticle condition. In similarity to the content of total soluble sugar, tobacco plants showed the highest average contents of flavone, flavonol and anthocyanin after growing in 20 mg/L ZnO nanoparticle conditions, 92.8%, 61.39% and 48.81% in wild type and 73.49%, 52.39% and 81.68% in transgenics, respectively. Tobaccos under 10 mg/L ZnO media condition increased the accumulation of total soluble sugar and flavonoid contents less than those under 20 mg/L ZnO media condition. However, these plants showed the lowest average percentage of cell membrane injury, 19.5% in wild type and 10-18% in transgenic tobaccos, following with plant under 20 mg/L ZnO nanoparticle and non ZnO nanoparticle conditions. Therefore, 10-20 mg/L ZnO nanoparticles in the media showed the induction of plant metabolites, especially in transgenics, and the enhancements of plant protection when compared with the same line tobacco under condition of non ZnO nanoparticles. Ten mg/L ZnO nanoparticle media is the best condition in protecting cellular membrane of tobacco.
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    Antibacterial activity of thai medicinal plant extracts against oral and gastrointestinal pathogenic bacteria and prebiotic effect on the growth of lactobacillus acidophilus
    (2018-01-01)
    Nanasombat, Suree
    ;
    Kuncharoen, Nattakorn
    ;
    Ritcharoon, Benjarat
    ;
    Sukcharoen, Paweena
    The 25 crude methanolic extracts of Thai medicinal plants were tested for their antibacterial activity against 10 bacterial strains using disk diffusion assay and minimum inhibitory concentration (MIC) determination. Rhubarb (Rheum palmatum) root, wild turmeric (Curcuma aromatica) rhizome, aleppo oak (Quercus infectoria) gall and ringworm bush (Cassia alata) stem extracts possessed strong antibacterial activity. Aleppo oak and wild turmeric extracts strongly inhibited Y. enterocolitica growth, while aromatic ginger (Kaempferia galanga) rhizome, rhubarb, wild turmeric and ringworm bush extracts strongly inhibited the growth of Porphyromonas gingivalis, an oral pathogen (0.32 mg/mL MIC). The aleppo oak gall extract had the highest phenolics and tannins (672.13 mg gallic acid equivalents (GAE)/g extract and 884.79 mg tannic acid equivalents (TAE)/g extract, respectively), whereas copper pod (Peltophorum pterocarpum) stem bark extract had the highest flavonoids (5,293.60 mg quercetin eqivalents (QE)/g extract). Five plant extracts with high water soluble carbohydrate were tested for their prebiotic properties. Their indigestible polysaccharide contents and prebiotic effect on the growth of Lactobacillus acidophilus in MRS broth were determined. Of all, mangosteen (Garcinia mangostana) fruit peel, nutgrass (Cyperus rotundus) rhizome and gac (Momordica cochinchinensis) root extracts had high indigestible polysaccharide contents, and exhibited good stimulating effect to the growth of L. acidophilus.