Lachenmeier (2005) Rapid quality control of spirit drinks and beer using multivariate data analysis of FTIR spectra

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Rapid quality control of spirit drinks and beer using multivariate data analysis of FTIR spectra

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CONTRIBUTORS:

Author:

Lachenmeier, Dirk W (Chemisches und Veterinäruntersuchungsamt Karlsruhe)

CONFERENCE NAME:

1st European User Meeting on Multivariate Data Analysis

CONF. LOCATION:

Frankfurt, Germany

CONFERENCE YEAR:

2005

PUB TYPE:

Conference Presentation

SUBJECT(S):

FTIR, spectroscopy, multivariate data analysis, partial least squares (PLS) regression, Principal Component Analysis (PCA), spirit drinks, beer

DISCIPLINE:

Agricultural and Food Sciences

HTTP:

http://www.camo.com/rt/downloads/European%20User%20Meet/PDF/Session%20II%20Analysis%20of%20Spectroscopic%20Data/Lachenmeier_Rapid%20Quality%20Control%20of%20Spirit%20Drinks%20and%20Beer%20using%20Multivariate%20Data%20Analysis%20of%20FTIR%20Spectra.pdf

LANGUAGE:

English

PUB ID:

103-413-812 (Last edited on 2005/05/29 13:13:49 GMT-6)

SPONSOR(S):

ABSTRACT:
Fourier Transform Infrared (FTIR) spectroscopy in combination with multivariate data analysis is introduced for the quality control and authenticity assessment of spirit drinks and beer in official food control. The spectra were measured using a FTIR interferometer, which is purpose-built for the analysis of alcoholic beverages and includes an injection unit for liquids with automatic thermostating of the sample (Foss WineScan FT 120). Only 2 min are required for FTIR measurement.. For spirit drinks, no samples preparation is required at all. Carbon dioxide containing samples, such as beer were prepared by degassing.
Using the partial least squares (PLS) method, FTIR spectra were correlated with results from reference methods. For spirit drinks, the parameters ethanol and density as well as the volatile compounds methanol, ethyl acetate, propanol-1, isobutanol and 2-/3-methyl-1-butanol were calibrated. For beer, calibrations for calculating the parameters ethanol, density, original gravity, pH, lactic acid, bitter value, and EBC colour were established.
In addition, Principal Component Analysis (PCA) was applied to the analysis results. A differentiation between different categories was possible (e.g. determination of Tequila category, control of the labelling of fruit spirits).
The results obtained suggest that FTIR is a useful tool in the quality control of alcoholic beverages, since quantitative determination of essential compounds as well as chemometric classification are simultaneously possible. Through use of FTIR screening, the majority of all samples were classified as being in conformance with legal and quality requirements. This left only conspicuous analysis results, which exceeded the predefined limits and therefore had to be confirmed by complex and labour-intensive reference analyses. In comparison to conventional methods, FTIR spectroscopy is faster and requires only a simple sample preparation.

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