おおさん、補足ありがとうございます。
パテントによるとDNaseの濃度がかなり高いようです。
http://www.freepatentsonline.com/6218531.html
The DNase treatment step in the High Pure RNA Isolation Kit procedure uses a high concentration sodium chloride salt solution. Unfortunately, DNase I is considerably less active in such high salt solutions, and therefore more enzyme must be added to digest the same amount of DNA compared to what would be required in a lower salt buffer. By adding larger amounts of DNase to the silica matrix, one increases the number of contaminants which must be removed from the matrix before the final elution step.
DNase Solution
3,500 units DNase I (lyophilized) suspended in 5 μl of water; and 45 μl DNase Buffer (0.04M Tris, pH 8; 0.01 M NaCl; 0.006M MgCl2 ; and 0.01 M CaCl2).
This solution was aliquotted into convenient sized portions. Unused portions were stored at -20° C. |
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