title: Chemical and sensory effects of the freezing process on the aroma profile of black truffles (Tuber melanosporum).
abstract: The aim of this work was to evaluate the effect of freezing black truffles (Tuber melanosporum) on their aroma both in sensory and chemical terms. The truffles were frozen at temperatures of -20 to -80°C. Descriptive and discriminative sensory and chemical analyses, based on headspace solid phase microextraction followed by gas chromatography-mass spectrometry analysis (HS-SPME-GC-MS), were carried out after 1, 20, 40 and 60 days. Fifteen compounds with high aromatic potential in truffles were determined. Their selective ion peak areas were calculated, summed and expressed as percentage of active odour compound, in order to monitor changes in odour profile. The aroma of frozen truffles differed significantly from the aroma of fresh truffles. Volatile composition data revealed that T. melanosporum aromatic profile is deeply modified as a consequence of a freezing process. These aromatic changes could explain the loss of freshness observed in all frozen truffles. Methional and some phenols were suggested as markers of freezing time. Interestingly, 1-octen-3-one appeared as a general marker of freezing process.
authors.affiliation: Laboratory for Aroma Analysis and Enology, Aragón Institute of Engineering Research (I3A), Department of Analytical Chemistry, Faculty of Sciences, University of Zaragoza, 50009 Zaragoza, Spain. lcullere@unizar.es
authors.forename: Laura
authors.initials: L
authors.lastname: Culleré
authors.forename: Vicente
authors.initials: V
authors.lastname: Ferreira
authors.forename: María E
authors.initials: ME
authors.lastname: Venturini
authors.forename: Pedro
authors.initials: P
authors.lastname: Marco
authors.forename: Domingo
authors.initials: D
authors.lastname: Blanco
mesh_terms: D000328:Adult; D001203:Ascomycota / Q000737:chemistry*; D003080:Cold Temperature; D005260:Female; D005511:Food Handling / Q000379:methods*; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D008297:Male; D008875:Middle Aged; D013649:Taste; D055549:Volatile Organic Compounds / Q000032:analysis*
chemical_list: D055549:Volatile Organic Compounds