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Antimicrobial photodynamic therapy with Bixa orellana extract and blue LED in the reduction of halitosisa??A randomized, controlled clinical trial
摘要： This study aimed to evaluate the reduction of halitosis when using antimicrobial photodynamic therapy (aPDT) with Bixa orellana extract and blue light-emitting diode (LED). Methods: Forty-four UNINOVE students or employees with a diagnosis of sulfide (H2S) ≥ 112 ppb in gas chromatography were selected. The patients were randomly divided in groups: Group 1 (n=15): aPDT with annatto and LED; Group 2 (n=14): tongue scraping; Group 3 (n=15): tongue scraping and aPDT. For aPDT, a was Bixa orellana extract used in a concentration of 20% w/v (Fórmula e A??o?, S?o Paulo, Brazil) on the tongue for 2 minutes, associated with a blue-violet LED (Valo Cordless Ultradent? Products, Inc., South Jordan, UT, USA) (395-480 nm). Six points were irradiated on the back of the tongue, at wavelength 395-480 nm for 20 seconds, energy of 9.6 J and radiant energy of 6.37 J/cm2 per point. The results were compared before, immediately after treatment and 7 days after. The Friedman test was used for the intragroup analysis and the Kruskal Wallis test for the intergroup analysis. Results: In all groups, there was a difference between baseline and the value immediately after the treatment. In Groups 1 and 3, there was no difference between the baseline and the 7 days control. Conclusion: There was an immediate reduction of halitosis, but the reduction was not maintained after 7days.
关键词： Light emitting diode,Photodynamic therapy,Bixa orellana,Halitosis
更新于2025-09-23 15:19:57
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Green synthesis of TiO2 nanoparticles using Bixa orellana seed extract and its application for solar cells
摘要： Mesoporous anatase TiO2 nanoparticles are the best photoanode materials for high performance DSSC. Chemical and physical methods used for the preparation of TiO2 nanoparticles suffer with environment related issues e.g. use of toxic solvents, hazardous by-products and consumptions of high energy. We have synthesized mesoporous anatase TiO2 nanoparticles from Titanium (IV) butoxide solution using Bixa orellana seed extract and further used it for making DSSC photoanode. The method offers environment friendly, cheaper and efficient DSSC. Structure, morphology, size and porosity of TiO2 nanoparticles were characterized using XRD, SEM, TEM and N2 sorption measurements. The amount of dye loading by TiO2 was obtained using desorption technique which revealed much higher dye loading for the plant seed grown nanoparticles (G-TNP). TNP and G-TNP demonstrated photovoltaic conversion efficiencies 1.03% and 2.97% respectively. This study therefore demonstrates that the synthesized mesoporous anatase TiO2 naoparticles can serve as promising photoanode materials for DSSC applications.
关键词： Natural dye,Thin film,Photoanode,TiO2 nanoparticles,Dye-sensitized solar cell,Bixa orellana
更新于2025-09-16 10:30:52