摘要 |
<p>Pref. filter aids are earths, carbons, kiesolguhr, bentonite, diatomaceous earth or mixts. of these. Ultrasonic decoloration and deodorisation is pref. carried out; also in exchange demineralisation. Before fermentation, the mixy. is pref. centrifuges at 50,000 rpm to remove colloidal proteins. In the fermentation, N, K and PO42- are pref. used. The mixt. is usually boiled before fermentation to destroy yeastes etc. The filtration process avoids the need for boiling and results in a more refined prod.</p> |