Bitrex (Denatonium Benzoate)
Definition
A quaternary ammonium compound used as a bittering agent in CDA and IMS formulations. Detectable by taste at 50 parts per billion; MW 446. Not toxic at denaturant concentrations but intensely aversive. Requires LC-UV or LC-MS/MS for analytical detection (not detectable by headspace GC-FID).
- Role
- Bittering agent in denatured spirit formulations
- Taste threshold
- 50 parts per billion
- Molecular weight
- 446
- Detection method
- LC-UV or LC-MS/MS (not headspace GC-FID)
Common questions
Why is Bitrex added to denatured alcohol formulations at all?+
Its purpose is to make the product intensely unpleasant to drink at extremely low concentrations, deterring consumption of alcohol that has been formulated for industrial or non-beverage use, which is the regulatory basis for denatured spirit exemptions.
Why does confirming Bitrex require LC-based methods rather than headspace GC?+
Headspace GC-FID relies on the analyte being volatile enough to partition into the vapour phase, but Bitrex is not sufficiently volatile for that approach, so a liquid-phase method such as LC-UV or LC-MS/MS is needed to detect and quantify it directly from the sample.
Related terms
- 27 CFR Part 21
- The US TTB regulatory code listing all approved formulas for completely denatured alcohol (CDA) and specially denatured alcohol (SDA) in the United...
- Completely Denatured Alcohol (CDA)
- Ethanol denatured with an approved formula of denaturants (in the EU/UK: methanol 1% + MEK 1% + Bitrex 1 g/hl; in India:...
- Country Liquor (India)
- The generic category for locally produced traditional fermented and distilled alcoholic beverages (including mahua, toddy, tharra, and similar products) regulated under state...
- EU Directive 92/83/EEC
- The foundational Council Directive harmonising the structure of excise duty on alcohol and alcoholic beverages within the European Union, defining product categories...
- Industrial Methylated Spirit (IMS)
- A UK HMRC category of denatured alcohol composed of 19 volumes of ethanol and 1 volume of methanol (approximately 5% methanol v/v),...
- Mahua Liquor
- A traditional Indian distilled spirit made from fermented flowers of Madhuca longifolia (the mahua tree). Produced primarily in Jharkhand, Odisha, Chhattisgarh, Madhya...
- Pyridine
- An aromatic nitrogen heterocycle used as a secondary denaturant in Indian denatured spirit formulations (at 1-2% v/v). Its presence in a headspace...
- Special Methylated Spirit (SMS / SDA)
- Denatured alcohol formulated with milder or more specific denaturants for use in particular industrial applications (cosmetics, fuel, cleaning products). In the UK,...
- T-Permit
- A licence issued by state excise departments in India (notably Andhra Pradesh, Telangana) to producers of country liquor, authorising distillation from specified...