Document Detail

Quantifying ethanol content of beer using interpretive near-infrared spectroscopy.
MedLine Citation:
PMID:  15527521     Owner:  NLM     Status:  MEDLINE    
On the basis of absorption measurements in the near-infrared (NIR) spectral range, a new method for the quantification of the ethanol content of beer is presented. Instead of the multivariate calibration models most commonly employed in NIR spectroscopic works, we use interpretive difference spectroscopy: Two wavelengths are selected according to the assignment of the absorption bands of the main substances of content of beer in the NIR region, and the difference between the absorbances at these wavelengths is used for ethanol quantification. Absorption spectra of the dominating beer ingredients are discussed and the calibration procedure with ethanol/water mixtures is shown. Robustness against the carbohydrate content of beer samples was demonstrated by analyzing solutions of ethanol and maltose in water. Validation of the method was performed with various beer samples with an ethanol concentration range between 0.5 and 7.7 vol %. The pertinent advantage of the procedure developed in this work is the indication that the results are independent from seasonal variations of the ingredients, which is of high interest for products with natural ingredients such as beer.
Sonja Engelhard; Hans-Gerd Löhmannsröben; Frank Schael
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Applied spectroscopy     Volume:  58     ISSN:  0003-7028     ISO Abbreviation:  Appl Spectrosc     Publication Date:  2004 Oct 
Date Detail:
Created Date:  2004-11-05     Completed Date:  2004-12-22     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372406     Medline TA:  Appl Spectrosc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1205-9     Citation Subset:  IM    
Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Str. 24/25, 14476 Potsdam-Golm, Germany.
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MeSH Terms
Beer / analysis*
Ethanol / analysis*
Food Industry / methods*
Spectrophotometry, Infrared / methods*
Reg. No./Substance:

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