Sycheva and colleagues fed mice micro- and nano-sized titanium dioxide for seven days and reported DNA damage in bone marrow and liver cells along with tissue damage elsewhere. They concluded the particles, common in food and cosmetics, are a potential health hazard.
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Chemical
FDA wants more safety studies on nanoparticles in food and cosmetics
The FDA released two documents encouraging, though not yet requiring, food and cosmetics makers to run more safety tests on nanoparticles such as titanium oxide and silica dioxide, already used in cheeses, sauces, confectionery, soaps and sunscreens.
Chemical
Nano form of titanium dioxide can be toxic to marine organisms
UC Santa Barbara researchers report in PLoS ONE that nanoparticle titanium dioxide, which had not previously shown toxicity under similar conditions, can harm marine organisms when exposed to ultraviolet radiation. An editor's note warns that particle size changes how chemicals act.
Chemical
Nanoparticles like zinc oxide trigger inflammation
Zinc oxide nanoparticles showed dose-dependent toxicity in mouse and human cell lines and raised reactive oxygen species fourfold. Dendritic cells exposed to them produced more of the pro-inflammatory cytokines IL-6 and TNF-a, suggesting the particles may induce inflammation.
Sci-Tech
Sci-fi food storage paper fights bacteria
Israeli and Russian researchers coated paper with silver nanoparticles that killed both Gram-positive and Gram-negative bacteria and stayed effective after six months at room temperature, pointing to food preservation uses. Large-scale production is not practical yet.
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