Food and beverages contain many toxic chemicals that raise health concerns. Ethyl carbamate (EC) or urethane is the ethyl
ester of carbamic acid. It occurs at low level, from ng/L to mg/L, in many fermented foods and beverages. Ethyl carbamate
is genotoxic and carcinogenic for a number of species such as mice, rats, hamsters and monkeys. It has been classified as
a group 2A carcinogen, “probably carcinogenic to humans”, by the World Health Organization’s International Agency for Research
on Cancer (IARC) in 2007. The benchmark dose lower limit of ethyl carbamate is 0.3 mg/kg bw per day and the mean intake of
ethyl carbamate from food is approximately 15 ng/kg bw per day. Those levels were calculated for relevant foods including
bread, fermented milk products and soy sauce. Alcoholic beverages were not included in this calculation. However, high levels
of ethyl carbamate can be found in distillated spirits at concentrations ranging from 0.01 to 12 mg/L depending on to the
origin of spirit. Alcoholic drinks should thus be considered as a source of ethyl carbamate. Ethyl carbamate is produced by
several chemical mechanisms: first, from urea and various proteins like citrulline produced during the fermentation step and
second from cyanide, and hydrocyanic acid, via ethyl carbamate precursors such as cyanate. A large panel of ethyl carbamate
formation mechanisms is described from simple ethanolysis of urea in homogeneous liquid phase to photochemical oxidation of
cyanide ion or complex heterogeneous gas/solid catalytic reactions. Determination of ethyl carbamate in foods and beverages
involves various strategies according to the material, food or beverage, solid or liquid, and according to the concentration,
from ng/L to mg/L. Usually, adapted extractive techniques and pre-concentration step are followed by analysis by gas chromatography
coupled to mass spectrometry (GC–MS of GC–MS–MS). High performance liquid chromatography (HPLC) and semi-quantitative spectroscopic
methods (infra-red) are also proposed as valuable alternatives to the classical but time-consuming GC–MS. Various preventing
methods are developed and used in some cases at industrial scale to lower ethyl carbamate levels in food. Two types of preventing
methods are described. First, adapted and optimised practices in all step of the chain of foods’ (or beverages) production
lead in general to low ethyl carbamate level. Second, the abatement of ethyl carbamate precursors can be done by adapted enzymatic,
physical chemical or chemical methods according to the natures of raw materials and conditions of their production processes.
Keywords Ethyl carbamate - Urethane - Foods and beverages - Analysis - Formation - Preventing methods