Increase of Nitrite in Tarako and Mentaiko during Manufacture and Cold Storage due to Nitrate-reducing Bacteria

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  • たらこおよび辛子明太子の製造・保管中の硝酸還元菌による亜硝酸根の増加
  • タラ コ オヨビ カラシ メンタイコ ノ セイゾウ ・ ホカン チュウ ノ ショウサン カンゲンキン ニ ヨル アショウサン コン ノ ゾウカ

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Increases in nitrite ions in tarako, ikura and sujiko during manufacture or cold storage have been observed. We isolated 30 bacterial strains from tarako and examined their nitrite-producing abilities. Eleven strains among the isolates reduced nitrate to nitrite at 0-5 % NaCl and 5-30°C in a succinate-nitrate liquid medium. 16S rRNA gene sequence analysis indicated that these nitrate-reducing bacteria belonged to Vibrio, Halomonas or Cobetia. Two strains (strains No. 6 and No. 19) that showed the highest nitrite production among the isolates, and one strain (strain No. 17) that showed the lowest nitrite production, were inoculated in tarako and mentaiko. Then, they were tested for nitrite production after storage at 5, 10 and 20°C. Results showed that strain No. 19 produced nitrite ions at every tested temperature. We also found that frozen Alaska pollack roe imported from the USA and Russia were contaminated with nitrite-producing bacteria from 8 to 340 CFU/g. These results suggest that the increase in nitrite ions in tarako and mentaiko is due to the reduction of ingredient-derived nitrate to nitrite by nitrate-reducing bacteria that contaminate Alaska pollack roe.

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