TY - JOUR T1 - Characterization of the key odorants in raw Italian hazelnuts (Corylus avellana L. var. Tonda Romana) and roasted hazelnut paste by means of molecular sensory science. AU - Burdack-Freitag,Andrea, AU - Schieberle,Peter, Y1 - 2012/05/02/ PY - 2012/4/21/entrez PY - 2012/4/21/pubmed PY - 2012/9/15/medline SP - 5057 EP - 64 JF - Journal of agricultural and food chemistry JO - J Agric Food Chem VL - 60 IS - 20 N2 - The concentrations of 19 odorants, recently characterized by GC-olfactometry and aroma extract dilution analysis as the most odor-active compounds in raw hazelnuts, were quantitated by stable isotope dilution assays (SIDA). Calculation of odor activity values (OAV) on the basis of odor thresholds in oil revealed high OAVs, in particular for linalool, 5-methyl-4-heptanone, 2-methoxy-3,5-dimethylpyrazine, and 4-methylphenol. A model mixture in sunflower oil containing the 13 odorants showing OAVs above 1 in their natural concentrations resulted in a good similarity compared to the overall nut-like, fruity aroma of the raw hazelnuts. Quantitation of the 25 most odor-active compounds in roasted hazelnut paste by SIDA showed clear changes in the concentrations of most odorants, and formation of new odor-active compounds induced by the roasting process was observed. The highest OAVs were calculated for 3-methylbutanal (malty), 2,3-pentanedione (buttery), 2-acetyl-1-pyrroline (popcorn), and (Z)-2-nonenal (fatty), followed by dimethyl trisulfide, 2-furfurylthiol, 2,3-butanedione, and 4-hydroxy-2,5-dimethyl-3(2H)-furanone. The aroma of a model mixture containing the 19 odorants with OAVs above 1 in their actual concentrations in the roasted nut material was judged to elicit a very good similarity to the popcorn-like, coffee-like, and sweet-smoky aroma of the roasted hazelnut paste. New SIDAs were developed for the quantitation of 5-methyl-4-heptanone, 5-methyl-(E)-2-hepten-4-one, 2-thenylthiol, and 3,5,5-trimethyl-2(5H)-furanone. SN - 1520-5118 UR - https://www.unboundmedicine.com/medline/citation/22515832/Characterization_of_the_key_odorants_in_raw_Italian_hazelnuts__Corylus_avellana_L__var__Tonda_Romana__and_roasted_hazelnut_paste_by_means_of_molecular_sensory_science_ L2 - https://doi.org/10.1021/jf300908d DB - PRIME DP - Unbound Medicine ER -