| 摘要 |
<p>In prepn. of an adsorbent for alpha-amylase by cross-linking starch grains, before or during gelatinisation, using a known cross-linking agent, the cross-linked starch prod. is comminuted and/or enzymatically activated. The comminution is pref. by grinding, to a factor of 1-100. Activation is with at least 0.25 (2-12.5) units of alpha-amylase w.r.t. 1 mg of starch, for an incubation time of at least 0.5 (1-3) days at -20 to 30 (2-10) deg. C, and partic. in a buffer at pH 4-12. The powdered treated prod. is granulated with a gelling agent, pref. an aq. alginate soln., followed opt. by treatment with a salt soln., esp. an aq. soln. of a Ca salt. Esp., a suspension of the powdered starch prod. in a 0.1-2.5 wt./vol. alginate soln. in distilled water is treated dropwise with an aq. soln. of a Ca salt, esp. an at least 0.1M soln. of CaCl2, to form the Ca(2+) alginate complex. The powdery starch prod. may be used as a 5-30 wt./vol. aq. suspension.</p> |
