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TitleMonitoring the debittering of traditional stoned green table olives during the aqueous washing process using an electronic tongue
Author(s)Rodrigues, Nuno
Marx, Ítala M. G.
Dias, Luís G.
Veloso, Ana C. A.
Pereira, José A.
Peres, António M.
KeywordsDebittering stoned green olives
Basic tastes
Total phenols
Bitterness index
Electronic tongue
Issue dateJul-2019
JournalLWT - Food Science and Technology
CitationRodrigues, Nuno; Marx, Ítala M. G.; Dias, Luís G.; Veloso, Ana C. A.; Pereira, José A.; Peres, António M., Monitoring the debittering of traditional stoned green table olives during the aqueous washing process using an electronic tongue. LWT - Food Science and Technology, 109, 327-335, 2019
Abstract(s)Stoned green olives are traditional table olives produced in the Northeast of Portugal. They are highly appreciated due to their sensory characteristics and levels of complex phenols with strong antioxidant activity, having a significant agro-economic relevance. During debittering, stoned olives are immersed in water, which is changed each 2d during 20d, leading to the reduction of initial bitterness turning them edible olives. So, monitoring the basic taste, total phenols contents and the bitterness index during washing is very important being a time-consuming and expensive task. Thus, the possibility of using an electronic tongue, coupled with chemometrics, for monitoring debittering of stoned green olives (cvs. Cobrançosa and Negrinha de Freixo), was evaluated for the first time. The electronic tongue allowed discriminating the different debittering time-periods (sensitivity 62%, internal-validation), monitoring the decrease of bitter and pungent intensities and the increase of the sweet intensity (0.793R-Pearson0.971; RMSE1.388), assessing the decrease of the total phenols (R-Pearson0.934; RMSE19.1g GAE/kg) and of the bitterness index (R-Pearson0.892; RMSE0.864g Oleuropein/kg). Therefore, the device could be a practical tool to monitor debittering of stoned green olives during washing.
Publisher version
AccessOpen access
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

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