Hello! I´ve a question concerning the purity of isolated RNA: What about the ratios A260/A280 and A260/A230? Should they be as high as possible or do values for A260/280 of above 2.1 and/or values of above 2.4 for A260/A230 indicate contamination, too? What ranges are the best for each ratio? What can I do if one value is above a best value? best regards Jo