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How strong is your booze?
Date:3/22/2010

Both legitimate brewers and distillers - and authorities on the track of illicit alcohol from home stills - will soon have a helping hand. Measurement experts have unveiled a portable device to determine the strength of alcoholic drinks quickly and easily, almost anywhere. Published in the open access Chemistry Central Journal, the researchers show that their technique is just as accurate, and more sophisticated, than widely used lab-based methods.

Along with his colleagues, Dirk Lachenmeier of testing agency Chemisches und Veterinruntersuchungsamt (CVUA) in Karlsruhe, Germany, decided to use a simple, patented multiple-beam infrared sensor combined with a flow-through cell for automated alcohol analysis. His team tested the device, which is portable to allow for on-site measurements, on a range of alcoholic samples.

Their tests on 260 different alcoholic drinks showed that the flow-through infrared device was much easier to handle than typical reference procedures, while time-consuming sample preparation steps such as distillation weren't necessary. Their sensor was equal to or better than current densimetric or Fourier transform infrared (FTIR) methods: repeatability, as determined in six different wine samples, was 0.05% vol and the relative standard deviation was below 0.2%. They also tested wines partway through the fermentation process, and unrecorded (non-commercial or illicit) alcohol samples, with good results. The test took less than a minute per drink.

"The device gives the opportunity for mobile on-site control in the context of labeling control of wine, beer and spirits, the process monitoring of fermentations, or the evaluation of unrecorded alcohols," says Lachenmeier. He adds that the device can also be used easily in developing country settings, with results that compare well to a more sophisticated lab set up.

Only beers and other sparkling drinks need more time-consuming preparation, to first remove the
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Contact: Charlotte Webber
charlotte.webber@biomedcentral.com
44-203-192-2129
BioMed Central
Source:Eurekalert

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