Tannin assimilation

In the case of the winter moth, tannins may very well reduce assimilation by complexlng with dietary proteins. However, the assumption that this is how tannins inhibit growth in species other than the winter moth needs to be carefully re-examined. In the experiments cited above, mechanisms other than a reduction in assimilation appear to be operating. 

In order to study the influence of tannin length in the acetaldehyde on the kinetics of bridging reaction, we used the different grape seed tannin fraction (Table 2 and incubated them with malvidin 3-glucoside in presence or absence of a relative excess of acetaldehyde. We followed then the disappearance of anthocyanin by HPLC. The kinetics observed were assimilated to first order kinetics. The corresponding rates were (hen measured and are reported in table 3. 

Relation Between the Assimilable Nitrogen in a Wort and THE Nitrogen Preopitable by Tannin. 

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