Nanotitanium is found in products produced by Jello, Nestlé, M&Ms, Mothers, Mentos, Albertsons, Hostess and Kool Aid. Titanium dioxide is a white solid chemical substance used as a pigment in paints, paper, ink, plastic. Also, it is used in cosmetics and sunscreens. It is used to increase the whiteness or opacity of many products. However, the use of photocatalytic forms in sunscreen, particularly without additional chemical suppressants, creates the potential for formation of ROS that can induce oxidative stress or cytotoxicity in cells. However, most studies indicate that in healthy intact skin, sunscreen penetrates no further than the outer, dead layer of cells. There are some indications that small amounts of nanoTiO2 can penetrate broken or damaged (e.g., sunburned) skin. Recent studies in mice indicate that oral exposures to nanotitanium dioxide can cause genotoxicity either through ROS generation or an inflammatory response. This raises concerns about the use of nano TiO2 in consumer products that may be ingested. Some studies have shown that nano-TiO2 particles can attach externally to individual algal cells leading scientists to speculate that exposures could pose a risk to species that fertilize their gametes externally. Nanotitanium dioxide particles have been found to bioaccumulate in fish, although the uptake mechanism is not clear. Fish and invetebrates exposed to pure photoreactive nanoTiO2 experience a range of such sublethal effects as reproductive difficulty, pathological changes in gills and intestines, and behavioral changes. However, some scientists have suggested that in more natural settings nanotitanium dioxide particles will aggregate together or bind onto organic matter in aquatic environments, reducing their toxicity. eoearth.org/view/article/154762/
Posted on: Mon, 04 Nov 2013 17:09:13 +0000
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