Background: There is a need to monitor the fluoride content of dentifrices used for children in a country like India, where there is prevalence of endemic fluorosis.
Aim: To evaluate the fluoride content of dentifrices for children available in India.
Settings And Design: study in a laboratory setting.
Methods: About 27 major supermarkets/departmental stores in Chennai city were approached by the investigator. All dentifrices indicated for children, available in these stores were included in the present study. A total of four different dentifrice brands were procured from these outlets. For each brand of dentifrice, three samples were randomly chosen and used for fluoride analysis. The fluoride content was assessed in triplet by using spectrophotometric analysis, by a single blinded examiner. The test sample was compared to a standard solution, in a calibration curve to determine the fluoride concentration.
Results: The mean fluoride content of dentifrices, indicated for children was 449.5 ± 26.1 ppm.
Conclusions: All brands of commercially available dentifrices indicated for children had optimum amount of fluoride.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9469247 | PMC |
http://dx.doi.org/10.4103/jpbs.jpbs_847_21 | DOI Listing |
Water Res
December 2024
School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, Shanghai, PR China. Electronic address:
Dense Janus membranes (JMs) are potential candidates in hypersaline wastewater treatments for membrane distillation (MD). However, dense surface layers generally add obvious membrane mass transfer resistance, limiting its practical application. In this study, a novel dense JM was facilely developed by controlled interfacial polymerization utilizing a phosphonium functional monomer (THPC) on hydrophilic polyvinylidene fluoride (PVDF) substrate.
View Article and Find Full Text PDFMicrob Biotechnol
December 2024
Department of Biochemistry, Molecular Biology and Biophysics and Biotechnology Institute, University of Minnesota, Twin Cities, USA.
A major factor limiting the biodegradation of organofluorine compounds has been highlighted as fluoride anion toxicity produced by defluorinating enzymes. Here, two highly active defluorinases with different activities were constitutively expressed in Pseudomonas putida ATCC 12633 to examine adaption to fluoride stress. Each strain was grown on α-fluorophenylacetic acid as the sole carbon source via defluorination to mandelic acid, and each showed immediate fluoride release and delayed growth.
View Article and Find Full Text PDFSci Rep
December 2024
Department of Physics, Faculty of Science, Menoufia University, Shebin El-Koom, Menoufia, 32511, Egypt.
Barium fluoride borosilicate glass samples reinforced with varying amounts of GdO (BSBLG0-BSBLG4) have been manufactured using the conventional melt quenching procedure in order to provide additional research on the type of borosilicate glass. Structural, physical, and linear optical characteristics as well as γ-ray attenuation capacity of barium fluoride borosilicate doped with GdO was investigated. X-ray diffraction pattern proving the amorphous nature of the glass samples due to the absence of a distinctive crystalline characteristic peak.
View Article and Find Full Text PDFMater Horiz
December 2024
Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdansk University of Technology, 80-233 Gdansk, Poland.
A porous, photocatalytically active, and water-stable composite membrane has been developed based on Cu-NH-MIL-125(Ti), a titanium-based metal-organic framework (MOF) and PVDF polymeric matrix. To tune the structural and functional properties of the PVDF/MOF composites, the loading degree of the MOF within the polymer was systematically varied. The most effective performance of the composite material was achieved with a 10% wt/wt loading of MOF into the PVDF matrix.
View Article and Find Full Text PDFEnviron Geochem Health
December 2024
School of Water Resources and Environmental Engineering, East China University of Technology, Nanchang, 330013, Jiangxi, People's Republic of China.
Fluoride contamination is a serious environmental problem in lepidolite hydrometallurgy wastewater. The treatment of fluoride-bearing wastewater is challenging because of the presence of coexisting ions including lithium (Li), rubidium (Rb), silicate (SiO), sulfate radical (SO). However, aluminum-modified zeolite (Al@zeolite) with sufficient hydroxyl groups and high adaptability has unique advantages for eliminating fluoride from lepidolite hydrometallurgy wastewater.
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