Table 1. Volatile compounds from R. oligosporus ‘Koji’ cultured in mixed substratea

Compounds Peak area (%)
Mixed (bean+rice)
Esters
Ethyl acetate 3.14
Propanoic acid, ethyl ester 0.44
Butanoic acid, 2-methyl-, ethyl ester 0.77
Butanoic acid, 3-methyl-, ethyl ester 0.45
Isoamyl acetate 0.23
Aldehydes
Acetaldehyde 0.23
Isobutyraldehyde 0.19
3-Methylbutanal 0.81
Crotonaldehyde 0.81
2-Methyl-2-butenal 0.39
Heptaaldehyde 0.42
Ketones
2-Propane 1.55
2,3-Butanedion 1.58
Methyl ethyl ketone 3.07
Pentaborane 0.16
Methyl propyl ketone 0.62
3-Methyl-2-pentanone 0.11
3-Hexanone 0.16
2-Hexanone 0.28
3-Heptanone 0.44
2-Heptanone 0.36
5-Methyl-2-heptanone 0.12
3-Octanone 0.27
2-Octane 0.15
Alcohols
Ethyl alcohol 22.2
1-Propanol 1.50
2-Butanol 1.13
Isobutyl alcohol 7.87
1-Butanol 1.55
3-Methyl-2-butanol 0.10
Isoamyl alcohol 46.08
Dipheyl tetrahydro eriostanol 0.17
1-Hexanol 0.11
Pyrazines
2,5-Dimethylpyrazine 0.16
Trimethylpyrazine 0.42
3-Ethyl-2,5-dimethylpyrazine 0.32
Tetramethylpyrazine 0.72
Others
Methyl propyl ether 0.17
Methyl cyanide 0.16
9-Borabicyclo[3,3,1]nonane,9-ethyl 0.56
Total 100