Foods meat have problems are blackened when exposed to oxygen for a long time. Since the birth of Brown's metmyoglobin, seems to be a lack of fresh meat, consumers จึงไม่ยอมรับ.5 secondly, pH, and reducing agent, metal, oxygen and salt, such as table salt, sodium nitrate sodium nitrite, etc., to adjust the pH of meat to follow 6.0-6.6 will maintain the color of meat on a long time, salt used is sodium polyphosphate.
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