E171 — пищевая добавка, краситель диоксид титана, titanium dioxide (Е171)

Titanium dioxide may be used in food to give opacity. No adverse effects are known, and the compound is chemically inert. The manufacture of paint constitutes the major use of titanium dioxide, but it is also used as a paper coating and as a filler in rubber and plastics. The most common form of titanium dioxide at room temperature is the rutile structure, which is a slightly distorted hcp of O atoms with half octahedral holes filled by Ti atoms. Fine particles may be used to produce high opacity films as titanium dioxide has an exceptionally high refractive index in the visible region. Naturally occurring forms of titanium dioxide are usually impure, hence the sulphate process or the chloride process are normally used to harvest an acceptable purity of compound. Typical products include sweets, pharmaceutical tablets and vitamin supplements, sauces and cheese. Pollutes waterways. No adverse effects are known.



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