The cytotoxic effect was tested through the colorimetric assay employing 3′-[1-[(phenylamino) -carbonyl]−3,4-tetrazolium]-bis(4‑methoxy-6-nitro) benzene-sulfonic acid hydrate (XTT) by reading the absorbance at 490 nm after 3 h of incubation post treatment [28]. The absorbance is proportional to the metabolic rate of viable (live) cells.

What’s recently changed with titanium dioxide and regulations?

The FDA and certain others say titanium dioxide is safe to use in foods and personal care products. The FDA provides strict guidelines on how much can be used in food. The limit is very small: no more than 1% titanium dioxide.

A1:

The North American region suffered from the excess influx of material in the market, especially from the Asian countries, in the first half of the third quarter. The quarter, however, showed signs of significant improvement with a rise in the number of offtakes. Further, the lack of labor in the US challenged the rates of production of titanium dioxide and resulted in the depletion in the level of existing inventories, pushing the titanium dioxide price graph in an upward direction.