명태 肉質의 冷凍變性 防止에 關한 硏究 = Prevention of Freezing Denaturation in Alaska Pollack Muscle during Cold Storage

국문 초록 (Abstract)

冷凍명태 fillet의 冷凍變性 防止에 미치는 各種 添加物處理의 效果를 試驗코져 fillet를 凍結前에 21種類의 處理液에 5分間 浸漬하여 凍結貯藏한 후 解凍하였 을때의 free drip, expressible drip의 發生量 및 drip中의 total solid, nitrogen, DNA의 含量을 定量하여 冷凍變性의 程度를 比較檢討하였다.
1. Free drip는 處理液의 種類 및 濃度에 따라 큰 差를 나타내었으나, expressible drip에 있어서는 그 差가 적었다.
2. Drip량의 減少에 있어 效果가 큰 處理液은 sodium polyphosphate 10%, sodium polyphosphate: sodium pyrophosphate(1:1) 10% 및 5%, sodium chloride 10%, sodium citrate 10%였다. Sodium metaphosphate, glucose, sucrose 및 sorbitol의 處理 效果는 그다지 크지 못하였고, malic acid 處理는 큰 逆效果를 나타내었다.
3. Drip中의 total solid 및 nitrogen은 大체的으로 drip量에 比例하는 結果를 보였으나, malic acid 處理區의 nitrogen量은 drip의 發生量에 비하여 相當히 적은 量을 나타내었다.
4. Drip中의 DNA量에 미치는 前處理의 效果는 drip發生量 및 drip中의 total solid, nitrogen의 경우 보다 현저하였고, 特히 重合燐酸鹽의 效果는 커서 sodium metaphosphate까지도 良好한 結果를 나타내었다.
Malic acid 處理區는 drip量은 월등히 많은데도 DNA 含量은 微量에 지나지 않았다.

다국어 초록 (Multilingual Abstract)

The present study was conducted to evaluate the effect of prefreezing treatment, dipping the fillets into such solutions as condesed phosphate, sugars, and sodium chloride, upon the freezing denaturation of Alaska pollack muscle. The degree of freezing denaturation was estimated by measuring the amount of drip released, contents of total solid, total nitrogen, and DNA in the drip. Fillets were frozen at -27℃- -28℃ and stored for 20 and 40 days at -18℃- -20℃ .
The amount of free drip was greatly dependent on treating solution although the expressible drip was not so much variable. Among the treating solutions examined, 10% sodium polyphosphate, 5% and 10% of the mixture of sodium polyphosphate and sodium pyrophosphate (1:1 w/w), 10% sodium chloride, and 10% sodium citrate appeared most effective ones to retard the releasing of drip. The effect of sodium metaphosphate, glucose, sucrose, and sorbitol was not so benefitable. On the contrary, malic acid showed a remarkable reverse effect.
As a tendency, total solid, total nitrogen, and DNA in the drip varied proportionally to the amount of drip released. Releasing of DNA, however, was greatly affected by treating solutions comparing with that of total solid and total nitrogen. It was not the case in malic acid treated fillet particularly in DNA content, even though the amount of drip was greater than other cases, DNA content was far less.