| 摘要 |
Pasteurised food prod. of intermediate moisture content has water activity 0.86-0.91, and pH 4.5-5.5 and is pasteurised in packages which are hermetically sealed before, during or immediately after pasteurising. The specified water activity is achieved by drying the prod. (or one or more of its ingredients) and/or by incorporating a humectant. pref. a sugar, salt, polyol and/or water soluble acid. Pref. humectants are glycerol, sucrose, glucose, polypropylene glycol, NaCl and/or sorbitol. The pH is pref. adjusted with acetic, citric, lactic, malic or tartaric acids, glucono-delta-lactone or acidic Na pyrophosphate. The prods. have long-term storage stability without refrigeration. Compared with prods. of lower water activity they have superior quality (esp. because less humectant is needed); better heat exchange properties when reheated; and do not require addition of antimycotics. |
