Potassium bromate

Potassium bromate
IUPAC name	Potassium bromate
Other names	Potassium bromate(V) Bromic acid, potassium salt Bromated flour
Identifiers
CAS number	7758-01-2 Y
PubChem	24444
EC number	231-829-8
UN number	1484
RTECS number	EF8725000
Properties
Molecular formula	KBrO3
Molar mass	167.00 g/mol
Appearance	white crystalline powder
Density	3.27 g/cm3
Melting point	350 °C
Boiling point	370 °C (decomposes)
Solubility in water	6.91 g/100 mL (20°C) 13.3 g/100 mL (40 °C)
Solubility	slightly soluble in alcohol insoluble in acetone
Hazards
MSDS	ICSC 1115
EU Index	035-003-00-6
EU classification	Carc. Cat. 2 Toxic (T) Oxidant (O)
R-phrases	R45, R9, R25
S-phrases	S53, S45
NFPA 704	0 2 2 OX
Flash point	Non-flammable
LD50	321 mg/kg
Y (what is this?)  (verify) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Potassium bromate (KBrO₃), is a bromate of potassium and takes the form of white crystals or powder.

It is typically used as a flour improver (E number E924), strengthening the dough and allowing higher rising. It is an oxidizing agent, and under the right conditions, will be completely used up in the baking bread. However, if too much is added, or if the bread is not cooked long enough or not at a high enough temperature, then a residual amount will remain, which may be harmful if consumed. Potassium bromate might also be used in the production of malt barley where the U.S. Food and Drug Administration (FDA) has prescribed certain conditions where it may be used safely, which includes labeling standards for the finished malt barley product.^[1] It is a very powerful oxidizer (E° = 1.5 volts comparable to potassium permanganate). Bromate is considered a category 2B (possibly carcinogenic to humans) carcinogen by the International Agency for Research on Cancer (IARC).^[2]

Potassium bromate has been banned from use in food products in Europe, as well as the United Kingdom in 1990, and Canada in 1994, and most other countries. It was banned in Sri Lanka in 2001^[3] and China in 2005. It is also banned in Nigeria, Brazil and Peru.

In the United States, it has not been banned. The FDA sanctioned the use of bromate before the Delaney clause of the Food, Drug, and Cosmetic Act went into effect in 1958 — which bans carcinogenic substances — so that it is more difficult for it to now be banned. Instead, since 1991 the FDA has urged bakers to voluntarily stop using it. In California a warning label is required when bromated flour is used.

References

1. ^ Section 172.730 Potassium Bromate, Food Additives Permitted for Direct Addition to Food for Human Consumption, US Code of Federal Regulations, US Food and Drug Administration
2. ^ IARC--Summaries & Evaluations: Potassium Bromate (Group 2B), International Agency for Research on Cancer
3. ^ Bridges Across Borders, Environmental Law Alliance Worldwide