Table 4.

Concentration (%) of centroids used in the cluster analysis of Piper nigrum oils.

Compound	Cluster 1	Cluster 2	Cluster 3	Cluster 4
α-Thujene	0.610	1.510	0.323	1.250
α-Pinene	4.538	6.089	10.608	8.337
Camphene	0.173	0.125	0.288	0.036
Sabinene	5.892	19.141	2.179	0.175
β-Pinene	6.982	9.621	10.004	28.796
Myrcene	3.512	0.386	4.164	6.040
α-Phellandrene	2.169	0.688	2.686	0.485
δ-3-Carene	3.146	2.812	14.998	4.031
p-Cymene	0.758	0.546	1.324	0.074
Limonene	14.850	17.499	19.404	28.103
β-Phellandrene	0.000	0.173	0.111	0.027
(E)-β-Ocimene	0.588	0.190	0.111	0.053
Terpinolene	0.097	0.184	0.272	0.302
Linalool	0.473	0.398	0.412	1.083
δ-Elemene	0.019	0.223	0.675	0.049
α-Cubebene	1.661	0.777	0.477	0.844
α-Copaene	0.947	0.777	0.814	0.132
β-Elemene	0.148	0.402	0.515	0.205
β-Caryophyllene	33.815	20.759	17.184	8.951
α-Guaiene	0.183	0.202	0.088	0.000
α-Humulene	0.272	0.523	0.635	0.299
Germacrene D	0.012	0.015	0.465	0.014
β-Selinene	0.206	0.295	0.593	0.223
α-Selinene	0.483	0.500	0.674	0.091
α-Farnesene	0.000	0.000	1.088	2.495
β-Bisabolene	1.485	1.147	0.005	0.135
δ-Cadinene	0.134	0.381	0.165	0.120
Elemol	1.609	1.595	0.321	1.080
Caryophyllene oxide	1.923	1.182	0.863	1.135