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Relationships of overall estery aroma character in lagers with volatile headspace congener concentrations

Piggott, J.R. and Techakriengkrai, I. and Paterson, A. and Taidi, B. (2006) Relationships of overall estery aroma character in lagers with volatile headspace congener concentrations. Journal of the Institute of Brewing, 112 (1). pp. 41-49. ISSN 0046-9750

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Abstract

In lager beers the intensity of “estery” aroma character is re-garded as an important component of sensory quality, but its origins are somewhat uncertain. Overall “estery” aroma intensity was predicted from capillary gas chromatographic (GC) data following solid phase micro extraction (SPME) of headspaces. Estery character was scored in 23 commercial lagers using rank-rating, allowing assessors (13) constant access to a range of appropriate standards. From univariate data analysis, all asses-sors behaved similarly and lagers fell into three significantly different groups: low (1), high (1) and intermediate (21). The quantification of 36 flavour volatiles by SPME of headspaces was reproducible and principal component analysis explained 91% total variance. Multiple linear regression could utilise only a restricted (26) set of flavour volatiles, whereas partial least square regression, that considered all flavour components, showed significant differences and improved prediction. How-ever, an artificial neural network that could compensate for non-linearities and interactions in ester perception gave the most robust prediction at R2 = 0.88.

Item type: Article
ID code: 10402
Keywords: artificial neural network , correlation rank rating, sensory instrumental , least square regression, par-tial , beer sensory quality, estery aroma character, volatile headspace , lagers, Pharmacy and materia medica
Subjects: Medicine > Pharmacy and materia medica
Department: Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences
Unknown Department
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 19 Nov 2011 04:55
    Last modified: 16 Jul 2013 21:57
    URI: http://strathprints.strath.ac.uk/id/eprint/10402

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