Journal Highlight: Cocoa content influences chocolate molecular profile investigated by MALDI-TOF mass spectrometry

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  • Published: Jun 8, 2015
  • Author: spectroscopyNOW
  • Channels: Base Peak
thumbnail image: Journal Highlight: Cocoa content influences chocolate molecular profile investigated by MALDI-TOF mass spectrometry
MALDI-TOF MS analysis of the low-molecular-mass profile has been used to classify chocolate samples according to the cocoa content, allowing unknown samples to be assigned to the main chocolate categories.

Cocoa content influences chocolate molecular profile investigated by MALDI-TOF mass spectrometry

Journal of the Science of Food and Agriculture, 2015, 95, 1753-1756
Cínthia C. Bonatto and Luciano P. Silva

Abstract: Chocolate authentication is a key aspect of quality control and safety. Matrix-assisted laser desorption ionization time-of flight (MALDI-TOF) mass spectrometry (MS) has been demonstrated to be useful for molecular profiling of cells, tissues, and even food. The present study evaluated if MALDI-TOF MS analysis on low molecular mass profile may classify chocolate samples according to the cocoa content. The molecular profiles of seven processed commercial chocolate samples were compared by using MALDI-TOF MS. Some ions detected exclusively in chocolate samples corresponded to the metabolites of cocoa or other constituents. This method showed the presence of three distinct clusters according to confectionery and sensorial features of the chocolates and was used to establish a mass spectra database. Also, novel chocolate samples were evaluated in order to check the validity of the method and to challenge the database created with the mass spectra of the primary samples. Thus, the method was shown to be reliable for clustering unknown samples into the main chocolate categories. Simple sample preparation of the MALDI-TOF MS approach described will allow the surveillance and monitoring of constituents during the molecular profiling of chocolates.

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