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Ethanol or ethyl alcohol, C2H6O or EtOH, is widely used in the laboratory, particularly as a solvent and cleaning agent. There are different grades of high purity ethanol. Up to a purity of 95.6 % ethanol can be separated from water by destillation. Higher concentrations than 95% require usage of additives that disrupt the azeotrope composition and allow further distillation. Ethanol is qualified as "absolute" if it contains no more than one percent water. Whenever 'ethanol abs.' is mentioned without further specification in published protocols, it refers to ≥ 99 % ethanol a.r. (analytical reagent grade).
Abbreviation: ethanol abs.
Reference: MiPNet09.12 O2k-Titrations
High purity grade ethanol has to be used as a solvent especially for preparation of SUIT chemicals. In Oroboros-lab we use ethanol 'AR-grade' (analytical reagent grade) with more than 99.8 % ethanol. It is in compliance with the ACS, with the reagent part of the European Pharmacopoeia (Reag. Ph Eur) and also with the ISO standards.
Substrate and metabolite,