초록

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두부의 저장성 향상을 위해 포장한 후 가열처리하여 저장 중 두부의 미생물상과 이화학적인 변화를 검토하였다. 두부는 $CaCl_2$보다 초산으로 응고시키는 것이 저장성 향상에 효과적이었으며, 두부의 저장기간이 경과함에 따라 적정산도, amino태 질소 및 ammonia태질소와 두부현탁액의 탁도는 증가하였다. 두부를 포장하여 가열처리하면 저장초기의 세균수를 효과적으로 줄일 수 있어 저장성을 연장할 수 있었으나 직접가열과 마이크로파 가열간의 차이는 적었다. 초산으로 응고시킨 비가열처리 두부는 $30^{\circ}C$에서 1일만에 세균수가 $6.6{\times}10^6\;CFU/g$에 도달하여 저장성이 감소하며 3분간 가열처리하면 4일간 저장이 가능하였다.

Abstract ▼ AI-Helper

The effect of heat treatments (boiling or microwave heating) on packaged Tofu was investigated by microbial and physicochemical changes during its storage in order to improve the shelf-life. The shelf-life of the packaged Tofu prepared by acetic acid was found better than that prepared by calcium ch...

The effect of heat treatments (boiling or microwave heating) on packaged Tofu was investigated by microbial and physicochemical changes during its storage in order to improve the shelf-life. The shelf-life of the packaged Tofu prepared by acetic acid was found better than that prepared by calcium chloride. As the spoilage of Tofu developed, titratable acidity, amino and ammonia nitrogen contents, and optical density of packaged Tofu suspension were increased. Heat treatment of fresh Tofu in package was effective in lowering the bacterial counts, and extending shelf-life, but there was no significant difference between heating methods. Packaged Tofu prepared from acetic acid and pretreated by heating for 3 minutes kept the shelf-life of 4 days at $30^{\circ}C$, but that without heat treatment spoiled at one day.

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