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Type of publication: research article
Type of publication (PDB): Straipsnis Clarivate Analytics Web of Science / Article in Clarivate Analytics Web of Science (S1)
Field of Science: Chemijos inžinerija / Chemical engineering (T005);Chemija / Chemistry (N003)
Author(s): Kaškonas, Paulius;Stanius, Žydrūnas;Kaškonienė, Vilma;Obelevičius, Kęstutis;Ragažinskienė, Ona;Zilinskas, Antanas;Maruška, Audrius Sigitas
Title: Clustering analysis of different hop varieties according to their essential oil composition measured by GC/MS
Is part of: Chemical papers. Cham : Springer international publishing, 2016, vol. 70, iss. 12
Extent: p. 1568-1577
Date: 2016
Keywords: Klasterinė analizė;Apyniai;Eteriniai aliejai;K-means clustering;Number of clusters;Hops;Essential oils
Abstract: This study describes the analysis of total hops essential oils from 18 cultivated varieties of hops, five of which were bred in Lithuania, and 7 wild hop forms using gas chromatography-mass spectrometry. The study sought to organise the samples of hops into clusters, according to 72 semi-volatile compounds, by applying a well-known method, k-means clustering analysis and to identify the origin of the Lithuanian hop varieties. The bouquet of the hops essential oil was composed of various esters, terpenes, hydrocarbons and ketones. Monoterpenes (mainly β-myrcene), sesquiterpenes (dominated by β-caryophyllene and α-humulene) and oxygenated sesquiterpenes (mainly caryophyllene oxide and humulene epoxide II) were the main compound groups detected in the samples tested. The above compounds, together with α-muurolene, were the only compounds found in all the samples. Qualitative and quantitative differences were observed in the composition of the essential oils of the hop varieties analysed. For successful and statistically significant clustering of the data obtained, expertise and skills in employing chemometric analysis methods are necessary. The result is also highly dependent on the set of samples (representativeness) used for segmentation into groups, the technique for pre-processing the data, the method selected for partitioning the samples according to the similarity measures chosen, etc. To achieve a large and representative data set for clustering analysis from a small number of measurements, numerical simulation was applied using the Monte Carlo method with normal and uniform distributions and several relative standard deviation values. The grouping was performed using the k-means clustering method, employing several optimal number of clusters evaluation techniques (Davies-Bouldin index, distortion function, etc.) and different data pre-processing approaches. [...]
Affiliation(s): Biochemijos katedra
Botanikos sodas
Instrumentinės analizės APC
Kauno technologijos universitetas
Matematikos ir informatikos institutas
Vaistinių ir prieskon. augalų moks. sek.
Vytauto Didžiojo universitetas
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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