Characterization of odour-active volatiles and sensory analyses of roasted oak (Quercus humboldtii Bonpl.) acorns, a coffee substitute
DOI:
https://doi.org/10.17533/udea.vitae.v26n1a05Keywords:
SDE, QDA, odour-active volatiles, gas chromatography, food chemistryAbstract
Background: Oak acorns are roasted and grounded to produce a powder that is used to prepare a coffee substitute beverage. Objective: To identify the odour-active volatiles of the powder derived from roasted acorns of Quercus humboldtii and to perform a quantitative descriptive analysis (QDA) of its appearance, odour, and taste. Methods: The odour-active volatiles of roasted oak acorn powder were extracted by SDE and analyzed by GC/MS and olfactory analyses (GC/O). Sensorial analyses of this beverage were done by QDA (Quantitative Descriptive Analysis). Results: Nineteen compounds were identified, showing acid, buttery/caramel, smoke/roasted, and fruity odour notes, which are common to those of roasted coffee. Ketones, aldehydes, aliphatic acids, furanic alcohols and pyrazines were identified as relevant for this coffee substitute beverage. The major volatile compounds were furfural, 5-methyl furfural, furfuryl alcohol, and 3-hydroxy-2-butanone, some of them related to the sugar breakdown by heating. Odour attributes characterized by QDA, were in agreement with those detected by GC-O (Gas Chromatography coupled to Olfactometry), but some off-taste notes were detected. Conclusions: The results of molecular sensory approach confirmed that this product resembles coffee; however, QDA analyses showed the presence of undesirable taste. More studies are needed in order to improve the taste quality of this coffee substitute.
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References
Nixon KC. Global and neotropical distribution and diversity of Oak (genus Quercus) and Oak Forests. In: Kappelle M, editor. Ecological Studies, Vol. 185. Ecology and Conservation of Neotropical Montane Oak Forests. Berlin, Heidelberg: Springer-Verlag; 2006. 3-13 p.
Löf M, Brunet J, Filyushkina A, Lindbladh M, Skovsgaard JP, Felton A. Management of oak forests: striking a balance between timber production, biodiversity and cultural services. Int. J. Biodivers. Sci. Ecosyst. Serv. Manage. 2016; 12(1-2): 59-73.
Xu X, Wang Z, Rahbek C, Sanders NJ, Fang J. Geographical variation in the importance of water and energy for oak diversity. J Biogeogr. 2016 Feb; 43(2): 279-288.
Ayerdi M, Echazarreta-Gallego A, de Francisco-Rodríguez S, Hernández HH, Sarasketa-Gartzia I. Acorn cake during the Holocene: experimental reconstruction of its preparation in the western Pyrenees, Iberia. Veget Hist Archaeobot. 2016 Sep; 25(5): 443-457.
Bainbridge DA. Acorns as Food. History, use, recipes, and bibliography. [Internet]. Berkeley, USA: Bekeley Electronic Press. 1999 [Updated 13 february of 2014; quoted 2 november 2018]. Available in: https://works.bepress.com/david_a_bainbridge/17/download/.
Korus J, Witczak M, Ziobro R, Juszczak L. The influence of acorn flour on rheological properties of gluten-free dough and physical characteristics of the bread. Eur Food Res Technol. 2015 Jun; 240(6): 1135-1143.
Leporatti ML, Corradi L. Ethnopharmacobotanical remarks on the Province of Chieti town (Abruzzo, Central Italy). J Ethnopharmacol. 2001 Jan; 74(1): 17-40.
Pinna C. Acorn bread: A traditional food of the past in Sardinia (Italy). J Cult Herit. 2013 Jun; 14(3): S71-S74.
Silva S, Costa EM, Borges A, Carvalho AP, Monteiro MJ, Pintado MME. Nutritional characterization of acorn flour (a
traditional component of the Mediterranean gastronomical folklore). J Food Meas Charact. 2016 Sept; 10(3): 584-588.
Łuczaj L, Pieroni A. Nutritional ethnobotany in Europe: From emergency foods to healthy folk cuisines and contemporary foraging trends. In: Sánchez-Mata MdeC, Tardío J, Editors. Mediterranean Wild Edible Plants. New York, USA: Springer Science+Business Media; 2016. 33-56 p.
Rakić S, Povrenović D, Tešević V, Simić M, Maletić R. Oak acorn, polyphenols and antioxidant activity in functional food. J Food Eng. 2006 June; 74(3): 416-423.
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