
Proceedings Paper
Evaluating a novel application of optical fibre evanescent field absorbance: rapid measurement of red colour in winegrape homogenatesFormat | Member Price | Non-Member Price |
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Paper Abstract
Silica optical fibres were used to measure colour (mg anthocyanin/g fresh berry weight) in samples of red wine grape
homogenates via optical Fibre Evanescent Field Absorbance (FEFA). Colour measurements from 126 samples of grape
homogenate were compared against the standard industry spectrophotometric reference method that involves chemical
extraction and subsequent optical absorption measurements of clarified samples at 520 nm. FEFA absorbance on
homogenates at 520 nm (FEFA520h) was correlated with the industry reference method measurements of colour (R2 =
0.46, n = 126). Using a simple regression equation colour could be predicted with a standard error of cross-validation
(SECV) of 0.21 mg/g, with a range of 0.6 to 2.2 mg anthocyanin/g and a standard deviation of 0.33 mg/g. With a Ratio
of Performance Deviation (RPD) of 1.6, the technique when utilizing only a single detection wavelength, is not robust
enough to apply in a diagnostic sense, however the results do demonstrate the potential of the FEFA method as a fast and
low-cost assay of colour in homogenized samples.
Paper Details
Date Published: 4 March 2013
PDF: 6 pages
Proc. SPIE 8761, PIAGENG 2013: Image Processing and Photonics for Agricultural Engineering, 87610R (4 March 2013); doi: 10.1117/12.2019633
Published in SPIE Proceedings Vol. 8761:
PIAGENG 2013: Image Processing and Photonics for Agricultural Engineering
Honghua Tan, Editor(s)
PDF: 6 pages
Proc. SPIE 8761, PIAGENG 2013: Image Processing and Photonics for Agricultural Engineering, 87610R (4 March 2013); doi: 10.1117/12.2019633
Show Author Affiliations
David W. Lamb, Univ. of New England (Australia)
Published in SPIE Proceedings Vol. 8761:
PIAGENG 2013: Image Processing and Photonics for Agricultural Engineering
Honghua Tan, Editor(s)
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