Sensory Testing of Australian Fragrant, Imported Fragrant, and Non-fragrant Rice Aroma

Figures & data

Figure 1. Chromatogram of AF rice (Koala brand).

Figure 2. Chromatogram of IF rice (Kumarnthong brand).

Figure 3. Chromatogram of Australian NF rice (Sunrice brand).

Table 1 Concentration, T odor unit, and odor description of significant volatile aroma compounds in AF, IF, and NF rice

			Rice grain samples
			Imported fragrant		Australian fragrant		Non-fragrant
Significant aroma compounds11 12 13 14 15 16 17	T 11 (ppb)	Odor13 14 15 16 17 18	Concentration (ppb)	Odor unita	Concentration (ppb)	Odor unit	Concentration (ppb)	Odor unit
Hexanal	5	Green, grass	854	171	998	199.6	1,507	301.4
Butanol	500	Medicinal	5.3	0.01	4	0.008	9.4	0.02
2-Heptanone	140	Fruit, spicy	23.2	0.17	24.7	0.18	39.5	0.3
Heptanal	3	Fruity, fatty	24.7	8.2	20.4	6.8	25.8	8.6
2-Hexenal [E]	17	Green, fruity	7.0	0.4	7.4	0.4	15.2	0.9
2-Pentyl furan	—	Nutty, beany	34.8	—	47.1	—	77.9	—
1-Pentanol	4,000	Sweet, strong	83.7	0.02	102.3	0.03	103.7	0.03
Octanal	0.7	Citrus, fatty	26.1	37.3	23.9	34.1	29.0	41.4
2-Heptenal [E]	13	Fatty, green	45.4	3.5	92.8	7.1	80.2	6.2
2-Acetyl-1-pyrroline	0.1	Sweet, popcorn	49.0	490	33.8	338	0	—
6-Methyl-5-hepten-2-one	50	Herby, green	10.8	0.2	6.8	0.14	3.3	0.07
1-Hexanol	2,500	Sweet, green	50.7	0.02	76.6	0.03	58.9	0.02
Nonanal	1	Floral, fatty	28.2	28.2	28.5	28.5	41.9	41.9
2-Octenal [E]	3	Green, herby	47.4	15.8	59.0	19.7	94.4	31.5
1-Octen-3-ol	1	Herby, earthy	33.6	33.6	39.9	39.9	57.5	51.5
2-Ethyl hexanol	—	Oily, sweet	0	—	0	—	44.4	—
Benzaldehyde	350	Nutty, sweet	35.6	0.1	22.7	0.06	48.5	0.14
2-Nonenal [E]	0.08	Fatty, waxy	6.4	80	5.9	73.8	28.0	350
2-Decenal [E]	0.4	Sl.fatty, green	12.4	31.1	38.0	95.0	15.3	38.3
2,4-Decadienal[E,E]	0.07	Fatty, citrus, powerful	13.4	191	36.3	518.6	30.6	437.1
2-Phenyl ethyl alcohol	1,100	Sweet, floral	5.2	0.005	3.3	0.003	0	—
4-Vinylguaicol	3	Spicy, fruity	14.9	5.0	13.8	4.6	42.4	14.1
4-Vinylphenol	10	Unpleasant	3.5	0.4	4.1	0.4	4.5	0.5
Indole	140	Faecal, floral	12.3	0.09	2.2	0.02	16.9	0.12

^aOdor unit (U_o) calculated by concentration/T.

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