Methods for Determining Ethanol in Beer

摘要: Abstract Ethanol, together with water and carbohydrates, is one of the main components beer. Its concentration ranges from 0.05% (v/v) in alcohol free beers to about 12.5% strongest ones. An accurate rapid determination ethanol beer important for regulatory applications process control brewing industries, on-line continuous monitoring often desired. Classical methods such as refractometry, densitometry, or redox titration distilled sample, well gas chromatography, are routinely used industry government laboratories, but they time- labor-consuming procedures. To replace these techniques efforts have been made develop low-cost instrumentation and/or without complex sample pre-treatment. Biosensors based on oxidase dehydrogenase enzymes fabricated successfully applied alcoholic beverages. Furthermore, infrared spectroscopy mid- near-infrared region flow injection provided interesting possibilities also automate determination.