In this work we proposed a method to verify the differentiating characteristics of simple tea infusions
prepared in boiling water alone (simulating a home-made tea cup), which represents the final product
as ingested by the consumers. For this purpose we used UV–Vis spectroscopy and variable selection
through the Successive Projections Algorithm associated with Linear Discriminant Analysis (SPA-LDA)
for simultaneous classification of the teas according to their variety and geographic origin. For comparison,
KNN, CART, SIMCA, PLS-DA and PCA-LDA were also used. SPA-LDA and PCA-LDA provided signifi-
cantly better results for tea classification of the five studied classes (Argentinean green tea; Brazilian
green tea; Argentinean black tea; Brazilian black tea; and Sri Lankan black tea). The proposed methodology
provides a simpler, faster and more affordable classification of simple tea infusions, and can be used
as an alternative approach to traditional tea quality evaluation as made by skilful tasters, which is evidently
partial and cannot assess geographic origins.
In this work we proposed a method to verify the differentiating characteristics of simple tea infusionsprepared in boiling water alone (simulating a home-made tea cup), which represents the final productas ingested by the consumers. For this purpose we used UV–Vis spectroscopy and variable selectionthrough the Successive Projections Algorithm associated with Linear Discriminant Analysis (SPA-LDA)for simultaneous classification of the teas according to their variety and geographic origin. For comparison,KNN, CART, SIMCA, PLS-DA and PCA-LDA were also used. SPA-LDA and PCA-LDA provided signifi-cantly better results for tea classification of the five studied classes (Argentinean green tea; Braziliangreen tea; Argentinean black tea; Brazilian black tea; and Sri Lankan black tea). The proposed methodologyprovides a simpler, faster and more affordable classification of simple tea infusions, and can be usedas an alternative approach to traditional tea quality evaluation as made by skilful tasters, which is evidentlypartial and cannot assess geographic origins.
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