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An analytical decision maker method for routine controls of the incoming defective smoky cocoa beans.

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22 July 2021

AperTO - Archivio Istituzionale Open Access dell'Università di Torino

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An analytical decision maker method for routine controls of the incoming defective smoky cocoa beans.

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2019­03­21 16:55:33

Cocotea 2019

Topic:  Cocoa  Type:  Oral presentation  Abstract no.:  A­162  Status:  submitted  An analytical decision maker method for routine controls of the incoming defective smoky  cocoa beans.

E. Liberto1, P. Perotti1, C. Bortolini2, M. Somenzi2, M. Fontana2, C. Bicchi1

1Drug Science and Technology Department, University of Turin, Turin, Italy, 2Soremartec Italia S.r.l., Alba,  Italy Text Cocoa smoky off­flavour generates from unappropriated or not well controlled artificial drying applied on  beans to speeding up the post­harvest process in order to struggle the effect of unfavourable climate from  the small farmers producing cocoa. Smoky off­flavour cannot be removed cannot be removed during  chocolate manufacture and it can heavily affects the quality of the finished chocolate products1. The taste  test to define the chocolate quality is not made directly on the beans but on the liquor and requires long time  in terms of panel training and alignment, it often cannot be implemented at­line for an immediate feedback  and a critical objective evaluation. At the same time, there isn’t a reference objective method to detect this off flavour on incoming raw material. The aim of this work is to use diagnostic mass spectral fingerprints by HS­ SPME­electronic nose based on MS coupled with chemometrics in developing an instrumental prediction  model to detect smoky defective beans that can be exploited as an analytical decision maker for routine  controls2­3. Fifty bean samples from different year of harvest and origins were analysed and sensory  evaluated from an internal panel. A supervised PLS­DA model classification built on a cross­validated (5 CV) training set (n=35) and applied on an external test set (n=12) of samples display an ability of correct  classification of 100%. Results show that the HS­SPME­eMS fingerprints­chemometrics is a promising  approach to be used as a TAS (Total Analysis System)4 for a high throughput solution to discard defective  cocoa beans.   References 1CABISCO/ECA/FCC. 2015 2Pérez Pavón J. L., et al. TrAC Trends in Analytical Chemistry 25: 257­266, 2006. 3Liberto, E., et al. J. Agric. Food Chem. 61, 1652­1660, 2013 .Sandra P., et al. Chromatographia. 60: S299–S302, 2004.

Authors

First author:  Erica Liberto  Presented by:  Erica Liberto  Submitted by:  Erica Liberto 

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