Maturation of fermented rice-koji miso can be monitored by an increase in fatty acid ethyl ester.
A mixture of steamed soybean and boiled rice with seeded Aspergillus oryzae was naturally fermented without addition of yeasts or Lactobacilli, and kept matured for 12 months at room temperature. Chemical analysis of this rice-koji miso sample for lipid changes during maturation showed that triacylglycerol was gradually decomposed into free fatty acid, with distinct formation of fatty acid ethyl ester which, six months after the start of fermentation, came to account for 35.0% of total lipid. The ester was constituted primarily with linoleic acid (ca. 50%) and oleic acid (ca. 20%), no appreciable change in this proportion being observed during maturation. Also, the proportion was unique in that this did not reflect the fatty acid composition in a mixture of the two materials. It is possible to monitor the maturation of the rice-koji miso by following up the increase with time in fatty acid ethyl ester.
Yamabe
Shigeo
S
Tokyo Dietitian Academy, Tokyo, Japan. yamabe-sigeo@shokuryo.ac.jp
Kaneko
Kentaro
K
Inoue
Hiroko
H
Takita
Toshichika
T
D004952:Esters / Q000032:analysis* / Q000378:metabolism; D005227:Fatty Acids / Q000032:analysis* / Q000378:metabolism; D005285:Fermentation; D005516:Food Microbiology; D019787:Linoleic Acid / Q000378:metabolism; D050356:Lipid Metabolism; D008055:Lipids / Q000737:chemistry; D019301:Oleic Acid / Q000378:metabolism; D012275:Oryza / Q000378:metabolism*; D014280:Triglycerides / Q000378:metabolism
D004952:Esters; D005227:Fatty Acids; D008055:Lipids; D014280:Triglycerides; D019301:Oleic Acid; D019787:Linoleic Acid