Effect of Roasting Conditions on Color and Volatile Profile Including HMF Level in Sweet Almonds (Prunus dulcis)
- 19 March 2012
- journal article
- research article
- Published by Wiley in Journal of Food Science
- Vol. 77 (4), C461-C468
- https://doi.org/10.1111/j.1750-3841.2012.02629.x
Abstract
Microwave, oven, and oil roasting of almonds were used to promote almond flavor and color formation. Raw pasteurized almonds were roasted in a microwave for 1 to 3 min, in an oven at 177 °C for 5, 10, 15, and 20 min; and at 135 and 163 °C for 20 min, and in oil at 135, 163, and 177 °C for 5 min and 177 °C for 10 min. Volatile compounds were quantified in the headspace of ground almonds, both raw and roasted, by selected ion flow tube mass spectrometry. Strong correlations were found between L value, chroma, and 5-(hydroxy methyl)-2- furfural; and were independent of roasting method. Raw almonds had lower concentrations of most volatiles than roasted almonds. Conditions that produced color equivalent to commercial samples were 2 min in the microwave, 5 min at 177 °C in the oven, and 5 min at 135 °C in oil. Microwave heating produced higher levels of most volatiles than oven and oil roasting at commercial color. Sensory evaluation indicated that microwave-roasted almonds had the strongest aroma and were the most preferred. Oil-roasted almonds showed significantly lower levels of volatiles than other methods, likely due to loss of these volatiles into the oil. Alcohols such as benzyl alcohols and strecker aldehydes including benzaldehyde and methional were at higher concentrations than other volatiles in roasted almonds. The oxidation of lipids to form alkanals such as nonanal and degradation of sugars to form furan type compounds was also observed. The Maillard reaction contributed to the formation of more of the total volatiles in almonds than the lipid oxidation reaction. The level of 5-(hydroxy methyl)-2- furfural (HMF), color, volatile profile, and sensory perception can be used to develop the best roasting method, time, and temperature for almonds. The rate of color development and the production of volatiles differ under different roasting conditions. Based on the color, volatile, and sensory assessments of the 3 almonds, the use of microwave technology as a process for roasting almonds reduces processing time and leads to an almond product with better flavor than oven or oil roasting.Keywords
This publication has 27 references indexed in Scilit:
- Volatile Analysis of Ground Almonds Contaminated with Naturally Occurring FungiJournal of Agricultural and Food Chemistry, 2011
- Volatile Profile of Cashews (Anacardium occidentale L.) from Different Geographical Origins during RoastingJournal of Food Science, 2011
- Changes in volatile compounds and sensory quality during toasting of Spanish almondsInternational Journal of Food Science & Technology, 2009
- Model Studies on the Oxygen-Induced Formation of Benzaldehyde from Phenylacetaldehyde Using Pyrolysis GC-MS and FTIRJournal of Agricultural and Food Chemistry, 2008
- Analysis of ketones by selected ion flow tube mass spectrometryRapid Communications in Mass Spectrometry, 2003
- Effect of storage on nonenzymatic browning of apple juice concentratesFood Chemistry, 2002
- SIFT studies of the reactions of H3O+, NO+ and O2+ with a series of alcoholsInternational Journal of Mass Spectrometry and Ion Processes, 1997
- Activation of the Maillard Reaction Product 5-(Hydroxymethyl)furfural to Strong Mutagens via Allylic Sulfonation and ChlorinationChemical Research in Toxicology, 1994
- New Aspects of the Maillard Reaction in Foods and in the Human BodyAngewandte Chemie-International Edition, 1990
- FORMATION OF ALDEHYDES AND ALCOHOLS IN TOMATO FRUIT FROM U‐14 C‐LABELED LINOLENIC AND LINOLEIC ACIDSJournal of Food Science, 1975