Blood DNA conserving card and method for making the same
A technology for storing cards and blood, applied in the biological field, can solve the problems of lack of DNA separation and purification conditions, limited storage time, poor protection, etc., and achieve the effects of good safety, long storage time, and high safety protection.
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Embodiment 1
[0032] The making of embodiment 1 blood DNA preservation card:
[0033] 1) Dissolve 3 grams of Tris base and 3.72 grams of EDTANa in 300ml of deionized water 2 2H20, 25 grams of SDS, 118 grams of guanidine isothiocyanate and 1.9 mg of thiourea, adjust the pH to 8.0 with concentrated hydrochloric acid, add deionized water to make up to 500ml;
[0034] 2) Cut a nitrocellulose membrane of a certain size, with a thickness of about 0.3 mm, and put it into a certain volume of the above solution (according to 50 μl solution / cm 2 medium ratio), placed in a closed container to prevent external DNA contamination, and shaken at 100 rpm / min for 30 minutes until the solution was completely absorbed.
[0035] 3) Carefully take out the card that has absorbed the salt solution, bake at 80°C for 1 hour, and fully dry.
Embodiment 2
[0037] 1) Dissolve 3 grams of TrisBase and 1.86 grams of EDTANa in 300ml of deionized water 2 2H 2 0, 10 grams of SDS, 59 grams of guanidine isothiocyanate and 0.95 mg of thiourea, adjust the pH to 8.0 with concentrated hydrochloric acid, add deionized water to make up to 500ml;
[0038] 2) Cut a filter paper medium of a certain size with a thickness of about 1 mm, put it into a certain volume of the above solution (according to the ratio of 50 μl solution / cm2 medium), place it in a closed container to prevent external DNA contamination, shake at 100 rpm / min for 60 minutes, until The solution is absorbed completely.
[0039] 3) Carefully take out the card that has absorbed the salt solution, bake at 80°C for 1 hour, and fully dry.
Embodiment 3
[0041] 1) Dissolve 5 grams of TrisBase, 2.75 grams of EDTANa2 2H20, 15 grams of SDS, 80 grams of guanidine isothiocyanate and 1.29 mg of thiourea in 300 ml of deionized water, adjust the pH to 8.0 with concentrated hydrochloric acid, add deionized water to make up to 500ml;
[0042] 2) Cut a certain size of silica gel membrane medium with a thickness of about 0.5mm, put it into a certain volume of the above solution (according to the ratio of 50μl solution / cm2 medium), place it in a closed container to prevent external DNA contamination, shake at 100rpm / min for 40 minutes until the solution is completely absorbed.
[0043] 3) Carefully take out the card that has absorbed the salt solution, bake at 80°C for 1 hour, and fully dry.
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