Factors Influencing Olfactory Perception of Selected Off-flavourcausing Compounds in Red Wine - A Review

M. McKay; A. Buica

doi:10.21548/41-1-3669

M. McKay Department of Viticulture and Oenology; Stellenbosch University
A. Buica Department of Viticulture and Oenology; Stellenbosch University

Abstract

Extensive work on the chemical aspects of off-flavour in wine has been carried out by international researchers, but not as many studies focus on the organoleptic effects. This literature review therefore has a focus on the status of the sensory aspects of compounds associated with specific off-flavours in red wine, viz. three volatile phenols, as well as 2-isobutyl-3-methoxypyrazine and 2,4,6-trichloranisole. The review discusses sources and effects of the selected compounds in red wine, and what previous workers have found pertaining to the mechanisms of the odour perception of aroma compounds, odour detection thresholds, and issues relating to the effects of the matrix. It also considers the factors that have been found to cause differences in olfactory perceptions between panellists/judges, and covers some of the work that has been
carried out in characterising perceptual interactions between compounds in wine. Gaps that exist in the current literature are highlighted.

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Author Biography

M. McKay, Department of Viticulture and Oenology; Stellenbosch University

Lecturer

References

REFERENCES

Albert, P., Kidd, M., Stander, M. A., Nieuwoudt, H. H., Tredoux, A. G. J., & De Villiers, A., 2013. Quantitative survey of 3-alkyl-2-methoxypyrazines and first confirmation of 3-ethyl-2-methoxypyrazine in South African Sauvignon blanc wines. South African Journal of Enology and Viticulture, 34(1), 54–67.

Allen, M., Lacey, M., Boyd, S., 1996. Existence of different origins for methoxypyrazines of grapes and wines. In: G.R. Takeoka, R. Teranishi, P.J. Williams, & A. Kobayashi (eds). Biotechnol. Improv. Foods Flavors. American Chemical Society, Washington DC 220–227.

Álvarez-Rodríguez, M. L., López-Ocaña, L., López-Coronado, J. M., Rodríguez, E., Martínez, M. J., Larriba, G., & Coque, J. J. R., 2002. Cork taint of wines: Role of the filamentous fungi isolated from cork in the formation of 2,4,6-trichloroanisole by O methylation of 2,4,6-trichlorophenol. Applied and Environmental Microbiology. https://doi.org/10.1128/AEM.68.12.5860-5869.2002

Atanasova, B., Thomas-Danguin, T., Langlois, D., Nicklaus, S., Chabanet, C., & Etiévant, P., 2005. Perception of wine fruity and woody notes: Influence of peri-threshold odorants. Food Quality and Preference. https://doi.org/10.1016/j.foodqual.2004.10.004

Atanasova, B., Thomas-Danguin, T., Chabanet, C., Langlois, D., Nicklaus, S. & Etievant, P., 2005. Perceptual interactions in odour mixtures: odour quality in binary mixtures of woody and fruity wine odorants. Chem. Senses 30, 3, 209–217.

Audouin, V., Bonnet, F., et al., 2001. Limitations in the use of odor activity values to determine important odorants in foods. ACS Symposium Series 782: March, 156-171.

Ayabe-Kanamura, S., Saito, S., Distel, H., Martínez-Gómez, M., & Hudson, R. 1998. Differences and similarities in the perception of everyday odors. A Japanese-German cross-cultural study. In Annals of the New York Academy of Sciences. https://doi.org/10.1111/j.1749-6632.1998.tb10647.x

Barkat, S., Le Berre, E., Coureaud, G., Sicard, G., & Thomas-Danguin, T., 2012. Perceptual blending in odor mixtures depends on the nature of odorants and human olfactory expertise. Chemical Senses. https://doi.org/10.1093/chemse/bjr086

Bearak, B., 2009. A Whiff of Controversy and South African Wines - The New York Times. Available at https://www.nytimes.com/2009/06/29/world/africa/29stellenbosch.html.

Boidron, J., Chatonnet, P. & Pons, M., 1988. Influence du bois sur certaines substances odorantes des vins. Connaiss. la Vigne du Vin 22, 4, 275–294. https://doi.org/10.20870/oeno-one.1988.22.4.1263

Botha, J., 2010. Sensory, chemical and consumer analysis of Brettanomyces spoilage in South African wines. Master’s Thesis, Stellenbosch University, Western Province, South Africa.

Brattoli, M., de Gennaro, G., de Pinto, V., Loiotile, A., Lovascio, S. & Penza, M., 2011. Odour detection methods: olfactometry and chemical sensors. Sensors (Basel). 11, 5, 5290–322. https://doi.org/10.3390/s110505290

Buser, H. R., Zanier, C., & Tanner, H., 1982. Identification of 2,4,6-Trichloroanisole as a Potent Compound Causing Cork Taint in Wine. Journal of Agricultural and Food Chemistry, 30(2), 359-362. https://doi.org/10.1021/jf00110a037

Cadahía, E., Fernández de Simón, B., & Jalocha, J., 2003. Volatile compounds in Spanish, French, and American oak woods after natural seasoning and toasting. Journal of Agricultural and Food Chemistry,. https://doi.org/10.1021/jf0302456

Cain, W. S., De Wijk, R., Lulejian, C., Schiet, F., & See, L. C., 1998. Odor identification: Perceptual and semantic dimensions. Chemical Senses. https://doi.org/10.1093/chemse/23.3.309

Cameleyre, M., Lytra, G., et al., 2018. Perceptive interactions in red wines: How physico-chemical pre- sensorial effects may affect red wine fruity aromatic expression? In: B. Siegmund & E. Letner (eds). Flavour Sci. (1st ed.). Technischen Universitate Graz, Graz, Germany 241–244.

Chaput, M. A., El Mountassir, F., Atanasova, B., Thomas-Danguin, T., Le Bon, A. M., Perrut, A., Duchamp-Viret, P., 2012. Interactions of odorants with olfactory receptors and receptor neurons match the perceptual dynamics observed for woody and fruity odorant mixtures. European Journal of Neuroscience. https://doi.org/10.1111/j.1460-9568.2011.07976.x

Chatonnet, P., Dubourdie, D., Boidron, J. ‐n, & Pons, M., 1992. The origin of ethylphenols in wines. Journal of the Science of Food and Agriculture, 60 (2), 165–178. https://doi.org/10.1002/jsfa.2740600205

Chrea, C., Valentin, D., Sulmont-Ross, C., Ly Mai, H., Hoang Nguyen, D., & Abdi, H., 2004. Culture and odor categorization: Agreement between cultures depends upon the odors. Food Quality and Preference, 15(7–8), 669–679. https://doi.org/10.1016/j.foodqual.2003.10.005

Christiaens, J. F., Franco, L. M., Cools, T. L., de Meester, L., Michiels, J., Wenseleers, T. Verstrepen, K. J., 2014. The fungal aroma gene ATF1 promotes dispersal of yeast cells through insect vectors. Cell Reports. https://doi.org/10.1016/j.celrep.2014.09.009

Cravero, M. C., Bonello, F., del Pazo Alvarez, M., Tsolakis, C., & Borsa, D., 2015. The sensory evaluation of 2,4,6-trichloroanisole in wines. Journal of the Institute of Brewing, Vol 121, 411-417. https://doi.org/10.1002/jib.230

Culleré, L., Cacho, J., & Ferreira, V., 2007. An assessment of the role played by some oxidation-related aldehydes in wine aroma. Journal of Agricultural and Food Chemistry, 55 (3) 876-881. https://doi.org/10.1021/jf062432k

Curtin, C., Bramley, B., Cowey, G., Holdstock, M., Lattey, K., Coulter, A., Henschke, P., Francis, L. & Godden, P., 2008. Sensory perception of Brett and relationship to consumer preference. In: I.. Blair, R.J and Pretorius (ed). Proc. 13th Aust. Wine Ind. Tech. Conf. Australian Wine Industry Techn. conf., Adelaide, 207–211.

Czerny, M., Brueckner, R., Kirchhoff, E., Schmitt, R., & Buettner, A., 2011. The influence of molecular structure on odor qualities and odor detection thresholds of volatile alkylated phenols. Chemical Senses, 36 (6), 539-553. https://doi.org/10.1093/chemse/bjr009

Czerny, M., Christlbauer, M., Fischer, A., Granvogl, M., Hammer, M., Schieberle, P., 2008. Re-investigation on odour thresholds of key food aroma compounds and development of an aroma language based on odour qualities of defined aqueous odorant solutions. European Food Research and Technology, 228 (20), 265-273. https://doi.org/10.1007/s00217-008-0931-x

De March, C. A., Ryu, S. E., Sicard, G., Moon, C., & Golebiowski, J., 2015. Structure-odour relationships reviewed in the postgenomic era. Flavour and Fragrance Journal, 30 (5), 342-361. https://doi.org/10.1002/ffj.3249

De Simón, B. F., Cadahía, E., Sanz, M., Poveda, P., Perez-Magariño, S., Ortega-Heras, M., & González-Huerta, C., 2008. Volatile compounds and sensorial characterization of wines from four Spanish denominations of origin, aged in Spanish Rebollo (Quercus pyrenaica Willd.) oak wood barrels. Journal of Agricultural and Food Chemistry, Vol 56 (14), 9046-9055. https://doi.org/10.1021/jf8014602

De Vries, C. J., Buica, A., Brand, J., & Mckay, M. (2016). The Impact of Smoke From Vegetation Fires on Sensory Characteristics of Cabernet Sauvignon Wines Made From Affected Grapes. South African Journal of Enology & Viticulture, 37(1), 22–30.

Distel H., Ayabe-Kanamura S., Martinez-Gomez M., Schiker I, Kobayakawa T., Saito S., 1999. Perception of Everyday Odors—Correlation between Intensity Familiarity and Strength of Hedonic Judgment.pdf. Chemical Senses, 24, 191–199.

Eisele, T. A., & Semon, M. J., 2006. Best Estimated Aroma and Taste Detection Threshold for Guaiacol in Water and Apple Juice. Journal of Food Science, 70 (4), S267-S269. https://doi.org/10.1111/j.1365-2621.2005.tb07201.x

Escudero, A., Campo, E., Fariña, L., Cacho, J., & Ferreira, V., 2007. Analytical characterization of the aroma of five premium red wines. Insights into the role of odor families and the concept of fruitiness of wines. Journal of Agricultural and Food Chemistry, 55 (110, 4501-4510. https://doi.org/10.1021/jf0636418

Etievant, P. X. 1981. Volatile Phenol Determination in Wine. Journal of Agricultural and Food Chemistry, 29(1), 65–67. https://doi.org/10.1021/jf00103a017

Ferdenzi, C., Poncelet, J., Rouby, C., & Bensafi, M., 2014. Repeated exposure to odors induces affective habituation of perception and sniffing. Frontiers in Behavioral Neuroscience. https://doi.org/10.3389/fnbeh.2014.00119

Ferreira, V., 2012. Revisiting psychophysical work on the quantitative and qualitative odour properties of simple odour mixtures: A flavour chemistry view. Part 2: Qualitative aspects. A review. Flavour and Fragrance Journal, 27(3), 201–215. https://doi.org/10.1002/ffj.2091

Ferreira, V., Ortín, N., Escudero, A., Lopez, R., & Cacho, J., 2002. Chemical characterization of the aroma of Grenache ros?? wines: Aroma extract dilution analysis, quantitative determination, and sensory reconstitution studies. Journal of Agricultural and Food Chemistry, 50(14), 4048–4054. https://doi.org/10.1021/jf0115645

Ferreira, V., Sáenz-Navajas, M. P., Campo, E., Herrero, P., de la Fuente, A., & Fernández-Zurbano, P. (2016). Sensory interactions between six common aroma vectors explain four main red wine aroma nuances. Food Chemistry, 199, 447–456. https://doi.org/10.1016/j.foodchem.2015.12.048

Francis, I. & Newton, J., 2005. Determining wine aroma from compositional data. Australian Journal Grape& Wine Research 11, 2, 114–126.

Franco-Luesma, E., & Ferreira, V., 2016. Reductive off-odors in wines: Formation and release of H2S and methanethiol during the accelerated anoxic storage of wines. Food Chemistry, 199, 42–50. https://doi.org/10.1016/j.foodchem.2015.11.111

Fried, J. S., Torn, M. S., & Mills, E., 2004. The impact of climate change on wildfire severity: A regional forecast for northern California. Climatic Change, 64 (1/2), 164-191. https://doi.org/10.1023/B:CLIM.0000024667.89579.ed

Fudge, A. L., Ristic, R., Wollan, D., & Wilkinson, K. L., 2011. Amelioration of smoke taint in wine by reverse osmosis and solid phase adsorption. Australian Journal of Grape and Wine Research, 17 (2), 41–48. https://doi.org/10.1111/j.1755-0238.2011.00148

Fugelsang, K.C. & Edwards, C.G., 2007. Wine Microbiology. Practical Applications and Procedures. New York, NY, USA: Springer Science+Business Media.

Goldammer, J., Statheropoulos, M., & Andreae, M., 2009. Impacts of Vegetation Fire Emissions on the Environment, Human Health, and Security: A Global Perspective. Development in Environmental Science. 8, 3–36.

Goldner, M. C., Zamora, M. C., Lira, P. D. L., Gianninoto, H., & Bandoni, A., 2009. Effect of ethanol level in the perception of aroma attributes and the detection of volatile compounds in red wine. Journal of Sensory Studies. https://doi.org/10.1111/j.1745-459X.2009.00208.x

Goode, J., 2008. Burnt Rubber: The great South African wine debate. Available at http://www.wineanorak.com/blog/2008/10/burnt-rubber-great-south-african-wine.html.

Griffiths, N. M. (1974). Sensory properties of the chloro-anisoles. Chemical Senses, 1(2), 187–195. http://dx.doi.org/10.1093/chemse/1.2.187

Hammond, C.E., 2015. South African Wine Under Fire. Available at http://www.carolynevanshammond.com/blog/2015/10/12/south-african-wine-under-fire-1.

Hayasaka, Y., Baldock, G. A., Parker, M., Pardon, K. H., Black, C. A., Herderich, M. J., Jeffery, D. W., 2010. Glycosylation of Smoke-Derived Volatile Phenols in Grapes as a Consequence of Grapevine Exposure to Bushfire Smoke. Journal of Agricultural and Food Chemistry, 58(20), 10989–10998. https://doi.org/10.1021/jf103045t

He, J., Zhou, Q., Peck, J., Soles, R., & Qian, M. C., 2013. The effect of wine closures on volatile sulfur and other compounds during post-bottle ageing. Flavour and Fragrance Journal, 28 (2), 118-128. https://doi.org/10.1002/ffj.3137

Hein, K., Ebeler, S., & Heymann, Hi., 2009. Perception of fruity and vegetative aromas in red wine. Journal of Sensory Studies, 24(3), 441–455. https://doi.org/10.1111/j.1745-459X.2009.00220.x

Heyns, E., 2014. The Green South African palate - When does mint become eucalyptus or even downright weedy? Wineland Magazine. Available at http://www.wineland.co.za/the-green-south-african-palate- when-does-mint-become-eucalyptus-or-even-downright-weedy/.

Holt, H. & Pearson, W., 2014. Napping – a rapid method for sensory analysis of wines. AWRI Technical Reviews 208, 10–14.

Hopfer, H., & Heymann, H., 2014. Judging wine quality: Do we need experts, consumers or trained panelists? Food Quality and Preference. https://doi.org/10.1016/j.foodqual.2013.10.004

Howard, J. D., & Gottfried, J. A., 2014. Configural and elemental coding of natural odor mixture components in the human brain. Neuron. https://doi.org/10.1016/j.neuron.2014.10.012

Jackson, R.S. 2014. Sensory Perception and Wine Assessment: Chapter 11. Wine Science, Fourth Edition. Academic Press, Elsevier, United States. 831-888; DOI: http://dx.doi.org/10.1016/B978-0-12-381468-5.00011-7

Kaeppler, K., & Mueller, F. (2013). Odor classification: A review of factors influencing perception-based odor arrangements. Chemical Senses. https://doi.org/10.1093/chemse/bjs141

Keller, A., Gerkin, R. C., Guan, Y., Dhurandhar, A., Turu, G., Szalai, B,. Meyer, P., 2017. Predicting human olfactory perception from chemical features of odor molecules. Science, 355 (6327), 820-826. https://doi.org/10.1126/science.aal2014

Keller, A., Zhuang, H., Chi, Q., Vosshall, L. B., & Matsunami, H., 2007. Genetic variation in a human odorant receptor alters odour perception. Nature, 449 (468). https://doi.org/10.1038/nature06162

Kelly, D., & Zerihun, A., 2015. The Effect of Phenol Composition on the Sensory Profile of Smoke Affected Wines. Molecules, 20(6), 9536–9549. https://doi.org/10.3390/molecules20069536

Kelly, D., Zerihun, A., Hayasaka, Y., & Gibberd, M., 2014. Winemaking practice affects the extraction of smoke-borne phenols from grapes into wines. Australian Journal of Grape and Wine Research, 20 (3), 386-393 https://doi.org/10.1111/ajgw.12089

Kelly, D., Zerihun, A., Singh, D. P., Vitzthum Von Eckstaedt, C., Gibberd, M., Grice, K., & Downey, M., 2012. Exposure of grapes to smoke of vegetation with varying lignin composition and accretion of lignin derived putative smoke taint compounds in wine. Food Chemistry,135 (2),787-798 . https://doi.org/10.1016/j.foodchem.2012.05.036.

Kemp, S.E., Ng, M., Hollowood, T., & Hort, J., 2018. Introduction to Descriptive Analysis In: Descriptive Analysis in Sensory Evaluation. John Wiley & Sons, Ltd, Chichester, UK. ISBN:9780470671399, 1–39.

Kennison, K. R., Wilkinson, K. L., Pollnitz, A. P., Williams, H. G., & Gibberd, M. R., 2009. Effect of timing and duration of grapevine exposure to smoke on the composition and sensory properties of wine. Australian Journal of Grape and Wine Research, 15, 228-237. https://doi.org/10.1111/j.1755-0238.2009.00056.x

Kennison, K. R., Wilkinson, K. L., Pollnitz, A. P., Williams, H. G., & Gibberd, M. R.,2011. Effect of smoke application to field-grown Merlot grapevines at key phenological growth stages on wine sensory and chemical properties. Australian Journal of Grape and Wine Research, 17 (2), S5-S12. https://doi.org/10.1111/j.1755-0238.2011.00137.x

Kennison, K. R., Wilkinson, K. L., Williams, H. G., Smith, J. H., & Gibberd, M. R., 2008. Smoke-derived taint in wine: Effect of postharvest smoke exposure of grapes on the chemical composition and sensory characteristics of wine. Journal of Agricultural and Food Chemistry, 55 (26), 10897-10901. https://doi.org/10.1021/jf072509k

Krstic, M. P., Johnson, D. L., & Herderich, M. J., 2015. Review of smoke taint in wine: Smoke-derived volatile phenols and their glycosidic metabolites in grapes and vines as biomarkers for smoke exposure and their role in the sensory perception of smoke taint. Australian Journal of Grape and Wine Research, 21, 537-553. https://doi.org/10.1111/ajgw.12183

Laing, D. G., Eddy, A., & John Best, D., 1994. Perceptual characteristics of binary, trinary, and quaternary odor mixtures consisting of unpleasant constituents. Physiology and Behavior, 56 (1), 81-93. https://doi.org/10.1016/0031-9384(94)90264-X

Laing, D. G., Panhuber, H., Willcox, M. E., & Pittman, E. A., 1984. Quality and intensity of binary odor mixtures. Physiology and Behavior, 33 (2), 309-319. https://doi.org/10.1016/0031-9384(84)90118-5

Lapalus, E., 2016. Linking sensory attributes to selected aroma compounds in South African Cabernet Sauvignon wines, Master’s Thesis, Stellenbosch University, South Africa.

Lawless, H. T., 2002. Descriptive analysis of complex odors: reality, model or illusion? Food Quality and Preference. https://doi.org/10.1016/s0950-3293(98)00052-4

Lawless, H. & Heymann, H., 1998. Sensory Evaluation of Food Principles and Practices Second Edition. (2nd ed.). Springer, New York.

Lawless, H. & Heymann, H., 2010. Measurement of Sensory Thresholds. (Second ed.). Springer Science & Business Media (Food Science Text Series), New York.

Le Barbé, E., 2003. Creating and Validating an aroma and flavor lexicon for the evaluation of sparkling wines. Master’s Thesis. University of California, Davis, California, USA.

Le Berre, E., Thomas-Danguin, T., Béno, N., Coureaud, G., Etiévant, P., & Prescott, J., 2008. Perceptual processing strategy and exposure influence the perception of odor mixtures. Chemical Senses, 33 (2), 193-199. https://doi.org/10.1093/chemse/bjm080

Lorrain, B., Tempere, S., Iturmendi, N., Moine, V., de Revel, G., & Teissedre, P.-L., 2013. Influence of phenolic compounds on the sensorial perception and volatility of red wine esters in model solution: An insight at the molecular level. Food Chemistry, 140 (1–2), 76–82. https://doi.org/10.1016/j.foodchem.2013.02.048

Lytra, G., Tempere, S., Le Floch, A., De Revel, G., & Barbe, J. C., 2013. Study of sensory interactions among red wine fruity esters in a model solution. Journal of Agricultural and Food Chemistry, 61 (36), 8504-8513. https://doi.org/10.1021/jf4018405

Lytra, G., Tempere, S., Revel, G. De, & Barbe, J. C., 2012. Impact of perceptive interactions on red wine fruity aroma. Journal of Agricultural and Food Chemistry, 60 (50), 12260-12269. https://doi.org/10.1021/jf302918q

Malfeito-Ferreira, M., Barata, A. & Loureiro, V., 2009. Wine spoilage by fungal metabolites. In: Wine Chemistry and Biochemistry. (Edited by M.V. Moreno-Arribas & M.C. Polo) New York, NY, USA: Springer Science+Business Media, ISBN 978-0-387-74118-5.

Marais, J., & Swart, E.,1999. Sensory impact of 2-methoxy-3-isobutylpyrazine and 4-mercepto-4-methylpentan-2-one added to a neutral Sauvignon blanc wine. South African Journal of Enology and Viticulture, 20, 77–79.

Martineau, B., Acree, T. E., & Henick-Kling, T.,1995. Effect of wine type on the detection threshold for diacetyl. Food Research International, 28(2), 139–143. https://doi.org/10.1016/0963-9969(95)90797-E

Mazzoleni, V., & Maggi, L., 2007. Effect of wine style on the perception of 2,4,6-trichloroanisole, a compound related to cork taint in wine. Food Research International, 40(6), 694–699. https://doi.org/10.1016/j.foodres.2006.11.014

McKay, M., Bauer, F. F., Panzeri, V., & Buica, A., 2018. Testing the Sensitivity of Potential Panelists for Wine Taint Compounds Using a Simplified Sensory Strategy. Foods. https://doi.org/10.3390/foods7110176

Meilgaard, M.C., Carr, Th., & Civille, G., 2015. Sensory evaluation techniques. (Fifth ed.). CRC Press, Taylor & Francis Group, New York. ISBN 9781482216905

Mozzon, M., Savini, S., Boselli, E., & Thorngate, J. H., 2016. The herbaceous character of wines. Italian Journal of Food Science, 28 (2), 190-207.

Münch, D., Schmeichel, B., Silbering, A. F., & Galizia, C. G., 2013. Weaker ligands can dominate an odor blend due to syntopic interactions. Chemical Senses, 38 (4), 293-304. https://doi.org/10.1093/chemse/bjs138

Nadler, B., Bensafi, M., Khan, R., Mandairon, N., Sobel, N., Weiss, T., Haddad, R., 2013. Global Features of Neural Activity in the Olfactory System Form a Parallel Code That Predicts Olfactory Behavior and Perception. Journal of Neuroscience, 30(27), 9017–9026. https://doi.org/10.1523/jneurosci.0398-10.2010

Noble, A. C., Arnold, R. A., Buechsenstein, J., Leach, E. J., Schmidt, J. O., & Stern, P. M.,1987. Modification of a Standardized System of Wine Aroma Terminology. Americal Journal of Enology and Viticulture, 38(2), 143-146.

Noestheden, M., Thiessen, K., Dennis, E.G., Tiet, B. & Zandberg, W.F., 2017. Quantitating Organoleptic Volatile Phenols in Smoke-Exposed Vitis vinifera Berries. J. Agric. Food Chem. 65, 38, 8418–8425.

Oelofse, A., Lonvaud-Funel, A., & du Toit, M., 2009. Molecular identification of Brettanomyces bruxellensis strains isolated from red wines and volatile phenol production. Food Microbiology, 26 (4) 377-385. https://doi.org/10.1016/j.fm.2008.10.011

Pagès, J., 2005. Collection and analysis of perceived product inter-distances using multiple factor analysis: Application to the study of 10 white wines from the Loire Valley. Food Quality and Preference. https://doi.org/10.1016/j.foodqual.2005.01.006Pangborn, R.M., Guinard, J.-X., et al., 1988. Regional aroma preferences Food Qual. Prefer. 1, 1, 11–19

Pangborn, R. M., Guinard, J. X., & Davis, R. G.,1988. Regional aroma preferences. Food Quality and Preference. https://doi.org/10.1016/0950-3293(88)90003-1

Panzeri, V., 2013. Influence of vineyard posts type on the chemical and sensorial composition of Sauvignon blanc and Merlot Noir wines. Master’s Thesis, Stellenbosch University, South Africa

Parker, B., Baldock, G., Haysaka, Y., Mayr, C., Williamson, P., Francis, I.L., Krstic, M., Herderich, M., & Johnson, D. 2013. Seeing through smoke. Wine and Viticulture Journal, January/Feb, 28, 42–46.

Parker, M., Osidacz, P., Baldock, G. A., Hayasaka, Y., Black, C. A., Pardon, K. H., Francis, I. L., 2012. Contribution of several volatile phenols and their glycoconjugates to smoke-related sensory properties of red wine. Journal of Agricultural and Food Chemistry, 60(10), 2629–2637. https://doi.org/10.1021/jf2040548

Parr, W. V., Mouret, M., Blackmore, S., Pelquest-Hunt, T., & Urdapilleta, I., 2011. Representation of complexity in wine: Influence of expertise. Food Quality and Preference, 22 (7), 647-660. https://doi.org/10.1016/j.foodqual.2011.04.005

Parr, W. V, Green, J. A., White, K. G., & Sherlock, R. R., 2007. The distinctive flavour of New Zealand Sauvignon blanc : Sensory characterisation by wine professionals, 18, 849–861. https://doi.org/10.1016/j.foodqual.2007.02.001

Perrin, L., Symoneaux, R., Maître, I., Asselin, C., Jourjon, F., & Pagès, J., 2008. Comparison of three sensory methods for use with the Napping® procedure: Case of ten wines from Loire valley. Food Quality and Preference, 19(1), 1–11. https://doi.org/10.1016/j.foodqual.2007.06.005

Perrone, M.G., Carbone, C., Faedo, D., Ferrero, L., Maggioni, A., Sangiorgi, G. & Bolzacchini, E., 2014. Exhaust emissions of polycyclic aromatic hydrocarbons, n-alkanes and phenols from vehicles coming within different European classes. Atmos. Environ. 82, 391–400.

Perry, D. M., & Hayes, J. E., 2016. Effects of matrix composition on detection threshold estimates for Methyl Anthranilate and 2-Aminoacetophenone. Foods, 5(2), 35–45. https://doi.org/10.3390/foods5020035

Parker, M., Osidacz, P., et al., 2012. Contribution of Several Volatile Phenols and Their Glycoconjugates to Smoke-Related Sensory Properties of Red Wine. Journal of Agricultural and Food Chemistry 60, 2629–2637.

Petrozziello, M., Asproudi, A., Guaita, M., Borsa, D., Motta, S., Panero, L., & Bosso, A., 2014. Influence of the matrix composition on the volatility and sensory perception of 4-ethylphenol and 4-ethylguaiacol in model wine solutions. Food Chemistry. https://doi.org/10.1016/j.foodchem.2013.10.098

Pineau, B., Barbe, J. C., Leeuwen, C. Van, & Dubourdieu, D., 2009. Examples of perceptive interactions involved in specific “Red-” and “Black-berry” aromas in red wines. Journal of Agricultural and Food Chemistry. https://doi.org/10.1021/jf803325v

Pollnitz, A. P., Pardon, K. H., Liacopoulos, D., Skouroumounis, G. K., & Sefton, M. A., 1996. The analysis of 2,4,6-trichloroanisole and other chloroanisoles in tainted wines and corks. Australian Journal of Grape and Wine Research. https://doi.org/10.1111/j.1755-0238.1996.tb00107.x

Pollnitz, A. P., Pardon, K. H., Sykes, M., & Sefton, M. A., 2004. The effects of sample preparation and gas chromatograph injection techniques on the accuracy of measuring guaiacol, 4-methylguaiacol and other volatile oak compounds in oak extracts by stable isotope dilution analyses. Journal of Agricultural and Food Chemistry. https://doi.org/10.1021/jf035380x

Prescott, J., Norris, L., Kunst, M., & Kim, S., 2005. Estimating a “consumer rejection threshold” for cork taint in white wine. Food Quality and Preference, 16(4), 345–349. https://doi.org/10.1016/j.foodqual.2004.05.010

Prida, A., & Chatonnet, P. (2010). Impact of oak-derived compounds on the olfactory perception of barrel-aged wines. American Journal of Enology and Viticulture, 50 (4), 447-455.

Rauhut, D. & Kiene, F., 2019. Chapter 19: Aromatic Compounds in Red Varieties. Red Wine Technology, pp273-282. https://doi.org/10.1016/b978-0-12-814399.00019-0

Ristic, R., Van Der Hulst, L., Capone, D. L., & Wilkinson, K. L., 2017. Impact of Bottle Aging on Smoke-Tainted Wines from Different Grape Cultivars. Journal of Agricultural and Food Chemistry. https://doi.org/10.1021/acs.jafc.7b01233

Risvik, E., Mcewan, J. A., Colwill, J. S., Rogersa, R., & Lyonb, D. H., 1994. Projective Mapping: A Tool for Sensory Analysis and Consumer Research. Food Quality and Preference, 5, 263–269.

Romano, A., Perello, M. C., Lonvaud-Funel, A., Sicard, G., & de Revel, G., 2009. Sensory and analytical re-evaluation of “Brett character.” Food Chemistry, 114 (1), 15-19. https://doi.org/10.1016/j.foodchem.2008.09.006

Roujou de Boubee, D., Van Leeuwen, C., & Dubourdieu, D., 2000. Organoleptic impact of 2-methoxy-3-isobutylpyrazine on red Bordeaux and Loire wines. Effect of environmental conditions on concentrations in grapes during ripening. Journal of Agricultural and Food Chemistry, 48(10), 4830–4834. https://doi.org/10.1021/jf000181o

Schutz, M., & Kunkee, R. E., 1977. Formation of hydrogen sulfide from elemental sufur during fermentation by wine yeast. American Journal of Enology and Viticulture, 28(3), 137–144.

Sefton, M. A., & Simpson, R. F., 2005. Compounds causing cork taint and the factors affecting their transfer from natural cork closures to wine - A review. Australian Journal of Grape and Wine Research. https://doi.org/10.1111/j.1755-0238.2005.tb00290.x

Sell, C., 2006. On the unpredictability of odor. Angewandte Chemie - International Edition, 45 (38), 6254-6261. https://doi.org/10.1002/anie.200600782

Sell, C., 2014. The Mechanism of Olfaction. In: Wiley (ed). Chem. Sense Smell. (1st ed.). John Wiley & Sons, Inc., Hoboken, NJ, USA 32–187.

Shibamoto, T., 1986. Odor Threshold of Some Pyrazines. Journal of Food Science, 51(4), 1098–1099. https://doi.org/10.1111/j.1365-2621.1986.tb11250.x

Shutz, M. & Kunkee, R., 1977. Formation of Hydrogen Sulfide from elemental sulfur during winemaking Am.J. Enol. Vitic. 28, 3, 137–144.

Silva Teixeira, C. S., Cerqueira, N. M. F. S. A., & Silva Ferreira, A. C., 2016. Unravelling the olfactory sense: From the Gene to Odor Perception. Chemical Senses, Vol 41 (2), 105–121. https://doi.org/10.1093/chemse/bjv075

Simpson, R., Amon, J., et al., 1986. Off-flavour caused by Guaiacol. Food Technology Australia. 38, 31–33.

Spillman, P. J., Iland, P. G., & Sefton, M. A., 1998. Accumulation of volatile oak compounds in a model wine stored in American and Limousin oak barrels. Australian Journal of Grape and Wine Research, 4(2), 67–73. https://doi.org/10.1111/j.1755-0238.1998.tb00136.x

Strydom, S., & Savage, M. J., 2016. A spatio-temporal analysis of fires in South Africa. South African Journal of Science, Vol 112 (11), 1-8. https://doi.org/10.17159/sajs.2016/20150489

Styger, G., Prior, B., & Bauer, F. F., 2011. Wine flavor and aroma. Journal of Industrial Microbiology & Biotechnology, 38 (9), 1145–1159. https://doi.org/10.1007/s10295-011-1018-4

Šuklje, K., Lisjak, K., Baša Česnik, H., Janeš, L., Du Toit, W., Coetzee, Z., Deloire, A., 2012. Classification of grape berries according to diameter and total soluble solids to study the effect of light and temperature on methoxypyrazine, glutathione, and hydroxycinnamate evolution during ripening of sauvignon blanc (Vitis vinifera L.). Journal of Agricultural and Food Chemistry, 60 (37), 9454–9461. https://doi.org/10.1021/jf3020766

Takeuchi, H., Kato, H., & Kurahashi, T., 2013. 2,4,6-trichloroanisole is a potent suppressor of olfactory signal transduction. Proceedings of the National Academy of Sciences of the United States of America, 110 (40), 16235–16240. https://doi.org/10.1073/pnas.1300764110

Taylor, M. K., Young, T. M., Butzke, C. E., & Ebeler, S. E., 2000. Supercritical fluid extraction of 2,4,6-trichloroanisole from cork stoppers. Journal of Agricultural and Food Chemistry, 48, 2208−2211. https://doi.org/10.1021/jf991045q

Tempere, S., Cuzange, E., Bougeant, J. C., De Revel, G., & Sicard, G. 2012. Explicit sensory training improves the olfactory sensitivity of wine experts. Chemosensory Perception, 5, 205-213. https://doi.org/10.1007/s12078-012-9120-1

Tempere, S., Cuzange, E., Schaaper, M. H., de Lescar, R., de Revel, G., & Sicard, G., 2014. “Brett character” in wine: Is there a consensus among professional assessors? A perceptual and conceptual approach. Food Quality and Preference, 34, 29-36. https://doi.org/10.1016/j.foodqual.2013.12.007

Tempere, S., Hamtat, M. L., de Revel, G., & Sicard, G., 2016. Comparison of the ability of wine experts and novices to identify odorant signals: A new insight in wine expertise. Australian Journal of Grape and Wine Research, 22 (2), 190-196. https://doi.org/10.1111/ajgw.12192

Tempere, S., Schaaper, M. H., Cuzange, E., de Lescar, R., de Revel, G., & Sicard, G., 2016. The olfactory masking effect of ethylphenols: Characterization and elucidation of its origin. Food Quality and Preference, 50, 135-144. https://doi.org/10.1016/j.foodqual.2016.02.004

Tempere, S., Schaaper, M. H., Cuzange, E., de Revel, G., & Sicard, G., 2017. Masking of Several Olfactory Notes by Infra-threshold Concentrations of 2,4,6-Trichloroanisole. Chemosensory Perception, 10(3), 69–80. https://doi.org/10.1007/s12078-017-9227-5

Thomas-Danguin, T., Sinding, C., Romagny, S., El Mountassir, F., Atanasova, B., Le Berre, E., Coureaud, G., 2014. The perception of odor objects in everyday life: a review on the processing of odor mixtures. Frontiers in Psychology. https://doi.org/10.3389/fpsyg.2014.00504

Torri, L., Dinnella, C., Recchia, A., Naes, T., Tuorila, H., & Monteleone, E., 2013. Projective Mapping for interpreting wine aroma differences as perceived by naïve and experienced assessors. Food Quality and Preference. https://doi.org/10.1016/j.foodqual.2013.01.006

Van Eeden, P., 2009. Chemical, sensory and consumer analysis of cork taint in South African wines. Master’s Thesis, Stellenbosch University, Western Province, South Africa.

Van Wyngaard, E., Brand, J., Jacobson, D., & Du Toit, W. J., 2014. Sensory interaction between 3-mercaptohexan-1-ol and 2-isobutyl-3-methoxypyrazine in dearomatised Sauvignon Blanc wine. Australian Journal of Grape and Wine Research. https://doi.org/10.1111/ajgw.12082

Vilanova, M. & Oliveira, J., 2012. Application of Gas Chromatography on the Evaluation of Grape and Wine Aroma in Atlantic Viticulture ( NW Iberian Peninsula ) In: S. Bekir & O. Celikbicak (eds). Gas Chromatography in Plant Science, Wine Technology, Toxicology and Some Specific Applications. InTechOpen, London, United Kingdom.

Weightman, C., Brand, J., et al., 2016. Sensory evaluation of wine (Part 1) Available at https://www.wineland.co.za/sensory-evaluation-of-wine-part-1/.

Weiss, S., 2014. The influence of grape variety on the production of volatile phenols in Portuguese wines. Master’s Thesis. Universidade Catolica Portuguesa: Escola Superior de Biotecnologia.

Wilkinson, K. L., Ristic, R., Pinchbeck, K. A., Fudge, A. L., Singh, D. P., Pitt, K. M., Herderich, M. J., 2011. Comparison of methods for the analysis of smoke related phenols and their conjugates in grapes and wine. Australian Journal of Grape and Wine Research. https://doi.org/10.1111/j.1755-0238.2011.00147.x

Wilson, C., 2017. Chemical evaluation and sensory relevance of thiols in South African Chenin Blanc wines. Master’s Thesis, Stellenbosch University, South Africa.

Wilson, C., Brand, J., du Toit, W., & Buica, A., 2018. Interaction Effects of 3-Mercaptohexan-1-ol (3MH), Linalool and Ethyl Hexanoate on the Aromatic Profile of South African Dry Chenin blanc Wine by Descriptive Analysis (DA). South African Journal of Enology and Viticulture, 39 (2), 271-283 https://doi.org/10.21548/39-2-3165

Wilson, D. A., 2005. Odor perception is dynamic: Consequences for interpretation of odor maps. In Chemical Senses, 30 (1), 105-106. https://doi.org/10.1093/chemse/bjh136

Wilson, D. A., & Sullivan, R. M., 2011. Cortical processing of odor objects. Neuron 72 (4), 506-519. https://doi.org/10.1016/j.neuron.2011.10.027

Wilson, D. & Stevenson, R., 2006. Learning to Smell. (2nd ed.) John Hopkins University Press, Baltimore. ISBN: 0-8018-8368-7

Wirth, J., Guo, W., Baumes, R., & Günata, Z., 2001. Volatile Compounds Released by enzymatic hydrolysis of glycoconjugates of leaves and grape berries from Vitis vinifera Muscat of Alexandria and Shiraz cultivars . Journal of Agricultural and Food Chemistry, 49 (6), 2917-23 . https://doi.org/10.1021/jf001398l

Wolf, L., 2018. Wildfires and wine: A detective story. C&EN Global Enterprise. https://doi.org/10.1021/cen-09619-feature2

Wooding, S., 2013. Olfaction: It makes a world of scents. Current Biology. https://doi.org/10.1016/j.cub.2013.07.009

Wurz, D.A., Allebrandt, R., Pereira de Bem, B., Bonin, B., Reinehr, J., Tamiris Canossa, A., Rufato, L., & Kretzschmar, A., 2017. Women have better olfactory perception for wine aromas. BIO Web Conf. 9, 04005. http://www.bio-conferences.org/10.1051/bioconf/20170904005

Yang, W., Li, W., & Liu, B., 2015. Odour prediction model using odour activity value from pharmaceutical industry. Austrian Contributions to Veterinary Epidemiology, 8, 51-60. https://doi.org/10.5281/zenodo.33827

Young, W. F., Horth, H., Ogden, T., Arnott, M., & Crane, R., 1996. Taste and odour threshold concentrations of potential potable water contaminants. Water Research, 30 (2), 331–340. https://doi.org/10.1016/0043-1354(95)00173-5

Taylor, M., Young, T., et al., 2000. Supercritical fluid extraction of 2,4,6-trichloroanisole from cork stoppers. Journal of Agricultural and Food Chemistry. 48, 6, 2208–2211.

Zhang, L., Zhao, L., Wang, H., Zhi, R., Shi, B. & Xie, N., 2016. Determination of Recognition Threshold and Just Noticeable Difference in the Sensory Perception of Pungency of Zanthoxylum bangeanum. Int. J. Food Prop. 19, 5, 1044–1052.

Zoecklein, B.W., Fugelsang, K.C., Gump, B.H., & Nury, F.S., 1995. Volatile Acidity. In: Wine Analysis and Production. Springer US, Boston, MA, ISBN 978-1-4757-6967-8.