. 2021 Aug 19;11:16868. doi: 10.1038/s41598-021-96377-6

Table 1.

Identification of the key aroma components of R. floribunda by hexane extraction, microwave assisted extraction, solid phase micro-extraction.

Component	Molecular formula	%Composition of hexane extract	%Composition of MAE	Composition % of SPME/GC	KI
Hydrocarbons
n-Heneicosane	C₂₁H₄₄	–	4.43	–	2096^a
n-Pentacosane	C₂₅H₅₂	3.41	–	–	2495^a
n-Heptacosane	C₂₇H₅₆	27.65	–	–	2696^a
1,6-Heptadyne	C₇H₁₀	–	–	12.17	1039 ^b
Di-cycloheptadiene	C₁₀H₁₂	–	–	1.32	1042 ^b
Cyclobutene, 2-propenylidene	C₇H₈	–	–	32.64	1114^b
n-Octacosane	C₂₈H₅₈	2.08	–	–	2789^a
2-Methyloctacosane	C₂₉H₆₀	4.79	–	–	2835^a
n-Nonacosane	C₂₉H₆₀	24.35	–	–	2891^a
Triacontane	C₃₀H₆₂	2.26	–	–	3009^a
Total hydrocarbons		64.54	4.43	46.13
Alcohols
Phenyl ethyl alcohol	C₈H₁₀O	7.62	14.64	35.75	1115^a 1113^b
Total alcohols		7.62	14.64	35.75
Aldehyde
Furfural	C₅H₄O₂	–	6.98	–	826^a
Phenyl acetaldehyde	C₈H₈O	–	25.71	–	1042^a
2-Butanal	C₄H₆O	–	–	5.73	1406^b
Total aldehyde		0	32.69	5.73
Ketones
3- Methyl-4-heptanone	C₈H₁₆O	3.08	–	–	918^b
Total ketones		3.08	0	0
Esters
Oxalic acid, allyl pentyl ester	C₇H₁₀O₄	–	–	0.67	1086^b
Oxalic acid, allyl ethyl ester	C₇H₁₀O₄	–	–	11.49	1418^b
Total esters		0	0	12.16
Phenols
Butylated hydroxytoluene	C₁₅H₂₄O	–	43.79	–	1515^a
Total phenols		0	43.79	0
Total identified compounds		75.24	95.55	99.77

MAE microwave assisted extraction, SPME solid phase micro-extraction.

^aKI (kovatis indices) on HP‐5 capillary column.

^bKI (kovatis indices) on DB5-MS column.