研究目的
Investigating the feasibility of FT-IR spectroscopy coupled with chemometrics for the quantification of ellagitannin concentration in wines.
研究成果
FT-IR appeared to be a promising technique for the determination of total ellagitannin concentration in samples aged in different types of oak, although it is not so efficient for samples aging in Chestnut barrels. However, it can estimate accurately the ellagitannin content of wine samples aged in different French and American barrels or being in contact with oak sticks.
研究不足
The method is not efficient for samples aging in Chestnut barrels probably due to the presence of ellagic acid derivatives.
1:Experimental Design and Method Selection:
The study used FT-IR spectroscopy coupled with chemometrics for the quantification of ellagitannin concentration in wines. Partial Least Squares regression was used to construct calibration models.
2:Sample Selection and Data Sources:
Four different monovarietal wines were aged in different types of barrel woods for different periods of time to obtain samples with varying ellagitannin levels.
3:List of Experimental Equipment and Materials:
A Thermo Nicolet 6700 FT-IR spectrophotometer equipped with a deuterated triglycine sulfate (DTGS) detector was used.
4:Experimental Procedures and Operational Workflow:
Triplicate spectra of samples were collected, smoothed using the Savitsky-Golay algorithm, and the baseline was corrected.
5:Data Analysis Methods:
Partial Least Squares regression was used for the construction of the calibration model.
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