Comparison of Three Approaches to Assess the Flavour Characteristics of Scotch Whisky Spirit

This study compared the use of three sensory and analytical techniques: Quantitative Descriptive Analysis (QDA), Napping, and Gas Chromatography-Mass Spectrometry (GC-MS) for the assessment of flavour in nine unmatured whisky spirits produced using different yeasts. Hierarchical Multiple Factor Analysis (HMFA) showed a similar pattern of sample discrimination (RV scores: 0.895–0.927) across the techniques: spirits were mostly separated by their Alcohol by Volume (ABV). Low ABV spirits tended to have heavier flavour characteristics (feinty, cereal, sour, oily, sulphury) than high ABV spirits, which were lighter in character (fruity, sweet, floral, solventy, soapy). QDA differentiated best between low ABV spirits and GC-MS between high ABV spirits, with Napping having the lowest resolution. QDA was time-consuming but provided quantitative flavour profiles of each spirit that could be readily compared. Napping, although quicker, gave an overview of the flavour differences of the spirits, while GC-MS provided semi-quantitative ratios of 96 flavour compounds for differentiating between spirits. Ester, arenes and certain alcohols were found in higher concentrations in high ABV spirits and other alcohols and aldehydes in low ABV spirits. The most comprehensive insights on spirit flavour differences produced by different yeast strains are obtained through the application of a combination of approaches.

[1]  A. Olaniran,et al.  Flavour‐active volatile compounds in beer: production, regulation and control , 2017 .

[2]  F. Jack,et al.  Sensory and Chemical Analysis of ‘Shackleton's’ Mackinlay Scotch Whisky , 2011 .

[3]  Per B. Brockhoff,et al.  Rapid descriptive sensory methods – Comparison of Free Multiple Sorting, Partial Napping, Napping, Flash Profiling and conventional profiling , 2012 .

[4]  John R. Piggott,et al.  Origins of Flavour in Whiskies and a Revised Flavour Wheel: a Review , 2001 .

[5]  Harry T. Lawless,et al.  Sensory Evaluation of Food , 1999 .

[6]  J. Brosnan,et al.  Chapter 16: Selecting new distilling yeasts for improved fermentation and for sustainability , 2012 .

[7]  Jérôme Pagès,et al.  Collection and analysis of perceived product inter-distances using multiple factor analysis: Application to the study of 10 white wines from the Loire Valley , 2005 .

[8]  William Pickup,et al.  Comparing conventional Descriptive Analysis and Napping®-UFP against physiochemical measurements: a case study using apples. , 2018, Journal of the science of food and agriculture.

[9]  R. Linforth,et al.  Origins of the perceived nutty character of new‐make malt whisky spirit , 2014 .

[10]  Penelope Sarah Oliver,et al.  Comparison of Quantitative Descriptive Analysis to the Napping methodology with and without product training , 2018 .

[11]  J. Teixeira,et al.  Yeast: the soul of beer’s aroma—a review of flavour-active esters and higher alcohols produced by the brewing yeast , 2014, Applied Microbiology and Biotechnology.

[12]  Jing Liu,et al.  Comparison of rapid descriptive sensory methodologies: Free-Choice Profiling, Flash Profile and modified Flash Profile. , 2018, Food research international.

[13]  H. Abdi,et al.  Multiple factor analysis: principal component analysis for multitable and multiblock data sets , 2013 .

[14]  P. Schieberle,et al.  Characterization of the key aroma compounds in an american bourbon whisky by quantitative measurements, aroma recombination, and omission studies. , 2008, Journal of agricultural and food chemistry.

[15]  Sylvie Chollet,et al.  Invited review Quick and dirty but still pretty good: a review of new descriptive methods in food science , 2012 .

[16]  Jing Liu,et al.  Performance of Flash Profile and Napping with and without training for describing small sensory differences in a model wine , 2016 .

[17]  Andreas Rytz,et al.  Sorting procedure as an alternative to quantitative descriptive analysis to obtain a product sensory map , 2006 .

[18]  Yan Xu,et al.  Aroma characteristics of Cabernet Sauvignon wines from Loess Plateau in China by QDA®, Napping® and GC–O analysis , 2020, European Food Research and Technology.

[19]  Akira Wanikawa.  Flavors in Malt Whisky: A Review , 2020 .

[20]  T. Næs,et al.  Trained sensory panellists’ response to product alcohol content in the projective mapping task: Observations on alcohol content, product complexity and prior knowledge , 2014 .

[21]  Tormod Næs,et al.  Validation of projective mapping as potential sensory screening tool for application by the honeybush herbal tea industry. , 2017, Food research international.

[22]  R. Aylott,et al.  Analytical Strategies to Confirm the Generic Authenticity of Scotch Whisky , 2010 .

[23]  J. Piggott,et al.  Headspace concentrations of ethyl esters at different alcoholic strengths , 1998 .

[24]  Jérôme Pagès,et al.  Testing the significance of the RV coefficient , 2008, Comput. Stat. Data Anal..

[25]  E. Risvik.  Sensory properties and preferences. , 1994, Meat science.

[26]  K. Hosoi,et al.  Identification of green note compounds in malt whisky using multidimensional gas chromatography , 2002 .

[27]  Tormod Næs,et al.  Validation of two Napping techniques as rapid sensory screening tools for high alcohol products. , 2013 .

[28]  Peter Martin,et al.  Bere whisky - rediscovering the spirit of an old barley , 2008 .

[29]  R. Gawel,et al.  The use of language by trained and untrained experienced wine tasters , 1997 .

[30]  J. Brosnan,et al.  The Impact of Copper in Different Parts of Malt Whisky Pot Stills on New Make Spirit Composition and Aroma , 2011 .

[31]  R. Singleton,et al.  Sensory Evaluation by Quantitative Descriptive Analysis , 2008 .

[32]  W. Bredie,et al.  “All-In-One Test” (AI1): A rapid and easily applicable approach to consumer product testing , 2013 .

[33]  J. Pagès,et al.  Recueil direct de distances sensorielles : application à l'évaluation de dix vins blancs du Val-de-Loire , 2003 .

[34]  Ross Aylott,et al.  Chapter 14 – Whisky analysis , 2014 .

[35]  Dominique Valentin,et al.  What is the validity of the sorting task for describing beers? A study using trained and untrained assessors , 2008 .

[36]  J. Winderickx,et al.  The influence of wort aeration and yeast preoxygenation on beer staling processes , 2008 .

[37]  S. Y. Pearson,et al.  Evaluation of a Brazilian fuel alcohol yeast strain for Scotch whisky fermentations , 2009 .

[38]  Struan J. Reid,et al.  Pre-fermentation of malt whisky wort using Lactobacillus plantarum and its influence on new-make spirit character. , 2020, Food Chemistry.

[39]  Davide Giacalone,et al.  Consumer-Based Product Profiling: Application of Partial Napping® for Sensory Characterization of Specialty Beers by Novices and Experts , 2013 .

[40]  F. R. Jack,et al.  Whiskies: composition, sensory properties and sensory analysis , 2012 .

[41]  F. J. Pérez Elortondo,et al.  Projective mapping in sensory analysis of ewes milk cheeses: A study on consumers and trained panel performance , 2004 .

[42]  H. Heymann,et al.  Comparison of descriptive analysis, projective mapping and sorting performed on pictures of fruit and vegetable mixes , 2014 .

[43]  Tormod Næs,et al.  Projective Mapping for interpreting wine aroma differences as perceived by naïve and experienced assessors , 2013 .

[44]  Jérôme Pagès,et al.  Hierarchical Multiple Factor Analysis: application to the comparison of sensory profiles , 2003 .

[45]  Lorena Andrade de Aguiar,et al.  Validation of rapid descriptive sensory methods against conventional descriptive analyses: A systematic review , 2019, Critical reviews in food science and nutrition.

[46]  Julien Delarue.  The use of rapid sensory methods in R&D and research: an introduction , 2015 .

[47]  Guillermo Hough,et al.  Overcoming the issues in the sensory description of hot served food with a complex texture. Application of QDA®, flash profiling and projective mapping using panels with different degrees of training , 2011 .

[48]  Sébastien Lê,et al.  FactoMineR: An R Package for Multivariate Analysis , 2008 .

[49]  J. Hajšlová,et al.  A novel approach to assess the quality and authenticity of Scotch Whisky based on gas chromatography coupled to high resolution mass spectrometry. , 2018, Analytica chimica acta.

[50]  G. Bathgate.  A review of malting and malt processing for whisky distillation , 2016 .

[51]  Hildegarde Heymann,et al.  PROJECTIVE MAPPING AND DESCRIPTIVE ANALYSIS OF MILK AND DARK CHOCOLATES , 2009 .

[52]  Jérôme Pagès,et al.  Comparison of three sensory methods for use with the Napping® procedure: Case of ten wines from Loire valley , 2008 .

[53]  Sébastien Lê,et al.  THE SORTED NAPPING: A NEW HOLISTIC APPROACH IN SENSORY EVALUATION , 2010 .

[54]  Tiantian Tian,et al.  Characterization of Volatiles in the Six Most Well-Known Distilled Spirits , 2013 .