Bisulphite reagent treatment of nucleic acid
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United States of America Patent
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May 1, 2012
Grant Date -
Oct 22, 2009
app pub date -
Mar 27, 2009
filing date -
Apr 29, 2004
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Abstract
Methods for treating nucleic acid including: (a) providing an alkali environment to a nucleic acid sample; (b) reacting the nucleic acid sample with a bisulphite reagent and incubating the reaction so as to form a treated nucleic acid sample where methylated nucleotides in the nucleic acid sample remain unchanged while unmethylated nucleotides are converted to another form; (c) removing unwanted reagents or diluents from the treated nucleic acid sample; and (d) carrying out de-sulphonation of the precipitated treated nucleic acid at a temperature from 70° C. to 95° C. by adjusting the precipitated treated nucleic acid to a pH of between 10 and less than 12.5 to remove sulphonate groups present on the treated nucleic acid and obtain a nucleic acid sample substantially free of sulphonate groups.
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