The FOSS WineScan FT-2 spectrometer predicts alcohol, pH, specific gravity, total acidity, acetic acid, malic acid and glucose plus fructose in Australian finished wines from mid-infrared spectra using partial least-squares (PLS) chemometrics calibrations. This technique offers significant advantages over traditional laboratory methods in its speed and ability to predict multiple analytes simultaneously.
Note that for the purpose of WineScan analysis, finished wines are considered to have finished alcoholic fermentation and have undergone some form of clarification such as cold settling, racking, centrifugation or filtration.
New wines that have just finished alcoholic fermentation but might still be going through malolactic fermentation OR that have not been clarified (cold settled/racked/centrifuged etc.) are NOT suitable for analysis by FTIR WineScan. Please request the End of Ferment Panel analysis for these wine types.
Finished wines (considered ready for bottling) that fit the range of measurement in the table below (e.g. less than 30 g/L sugar) are suitable for analysis using the WineScan.
Malic acid analysis can be conducted on wine samples with acetic acid less than 1.34 g/L and turbidity less than 40 NTU. *Note that malic acid by WineScan is not covered by NATA accreditation.
|Analyte||Range of Measurement||Units|
|Acetic acid||0. 25 – 1.34||g/L|
|Alcohol||10.0 – 16.5||% v/v|
|Glucose/Fructose||0.0 – 30.0||g/L|
|pH||2.95 – 3.80||–|
|Specific gravity||0.9800 – 1.000||–|
|Titratable acidity (pH 7.0)||4.3 – 7.7||g/L|
|Titratable acidity (pH 8.2)||4.8 – 8.2||g/L|
|Malic acid*||0.4 – 3.0 g/L||g/L|
|Panel price (excluding GST)|
|Included analysis||Accreditation Status*||Per Sample||Volume required/Target response time†|
|Volatile acidity as acetic acid||$52.50||Volume Required: 200mL
Target response time 24 hrs
|Glucose + fructose|
|Titratable acid pH 7.0|
|Titratable acid pH 8.2|
*Please refer to our NATA scope of accreditation here for matrices included.
† Response time refers to working days after receipt of samples and may vary depending on sample numbers submitted and the current workload in the laboratory.
Note: This panel is offered for a fee discounted from the sum of each individual analysis.
For more information, please contact AWRI Commercial Services on (08) 8313 6600 or firstname.lastname@example.org.
Samples should be submitted with minimal headspace. Samples will be processed at the discretion of AWRI Commercial Services; any sample deemed to be unsafe will not be analysed.
Volatile acidity as acetic acid is measured as acetic acid. Acetic acid makes up a large proportion of the volatile acidity and is used as the routine measure of volatile acidity. The calibration to predict acetic acid with FTIR technology has been developed using discrete analyser methods.
The calibration to predict alcohol with FTIR technology has been developed using distillation and densitometry methods.
GLUCOSE + FRUCTOSE
The calibration to predict glucose + fructose with FTIR technology has been developed using discrete analyser methods.
The calibration to predict malic acid with FTIR technology has been developed using discrete analyser methods.
The calibration to predict specific gravity with FTIR technology has been developed using densitometry methods.
The calibration to predict pH with FTIR technology has been developed using a calibrated pH meter and combination electrode.
Titratable acidity is measured at the endpoint of 8.2 for Australian requirements and 7.0 to fulfil the requirements of the European Union. Both results are expressed as g/L tartaric acid. The calibration to predict titratable acidity with FTIR technology has been developed using titration methods.