Compositions and methods for biological sample storage
Compositions and methods are disclosed for substantially dry storage at ambient or elevated temperatures of biological samples such as nucleic acids, proteins and cells in a form from which the samples can be substantially recovered, using a dissolvable or dissociable dry storage matrix comprising a borate composition and a stabilizer as disclosed, such as any of a number of zwitterionic stabilizers.
1. A matrix for substantially dry storage of a biological sample, comprising:
(a) a borate composition which comprises at least one compound selected from the group consisting of boric acid, boric anhydride, dihydrogen borate, hydrogen borate, diborate, triborate, tetraborate, metaborate, hydroxoborate (borax), borate salt, boric acid-glycerol and boric-acid-1,3 propanediol;
(b) at least one stabilizer that is selected from the group consisting of:
wherein R 1 is CH 3 or CH 2 CH 3 , and wherein when X is CH, Y is H or OH, and when X is CH 2 —CH, Y is H;
(iv) a compound of formula IV:
wherein R 1 is selected from aryl, arylaklyl, —H, —CH 3 —CH 2 —CH 3 , —CH 2 CH 2 OH, CH 2 CHOHCH 3 , CH 2 CHOHCH 2 OH, and CH 2 CH 2 CH 2 OH,
wherein X is selected from —CH 2 —, —CH 2 CH 2 —, —CH 2 CHOH, —CH 2 CH 2 CH 2 —, CH 2 CH 2 CH 2 CH 2 , CH 2 CHOHCH 2 and —CH 2 CHOHCHOHCH 2 —,
wherein Y is selected from COO − and SO 3 − ,
and wherein Z is selected from —CH 2 —, —CHOH—, O and S;
(vi) a compound of formula VI:
wherein R 1 and R 2 are each independently selected from aryl, arylakyl, —H, —CH 3 —-CH 2 —CH 3 , —CH 2 CH 2 OH, CH 2 CHOHCH 3 , CH 2 CHOHCH 2 OH, and CH 2 CH 2 CH 2 OH;
wherein the borate composition and the stabilizer are present at a molar ratio that is selected from a molar ratio of from about 10:1 to about 1:10, a molar ratio of from about 5:1 to about 1:5, and a molar ratio of from about 20:1 to about 1:20,
and wherein the matrix is capable of preventing degradation of an isolated DNA fragment of at least 10 kilobases during substantially dry storage of the DNA fragment in the matrix at 85° C. for a time period of at least two weeks.
2. The matrix of claim 1 wherein the biological sample comprises at least one of
(i) an isolated biomolecule that is selected from the group consisting of a nucleic acid, a protein, a polypeptide, a lipid, a glyconconjugate, an oligosaccharide, and a polysaccharide, and
(ii) a biological material that is selected from the group consisting of a mammalian cell, a bacterium, a yeast cell, a virus, a vaccine, blood, urine, a biological fluid, and a buccal swab.
3. The matrix of claim 1 wherein the biological sample comprises at least one isolated nucleic acid that is selected from DNA and RNA.
4. The matrix of claim 1 further comprising a biological inhibitor or biochemical inhibitor that is selected from the group consisting of a reducing agent, an alkylating agent, an antifungal agent and an antimicrobial agent.
5. A matrix for substantially dry storage of a biological sample, comprising:
(a) a borate composition which comprises at least one compound selected from the group consisting of boric acid, dihydrogen borate, hydrogen borate, diborate, triborate, tetraborate, metaborate, hydroxoborate (borax), borate salt, boric acid-glycerol, boric anhydride (B 2 O 3 ) and boric-acid-1,3 propanediol;
(b) at least one stabilizer selected from the group consisting of hydroxyectoine, ectoine, homoectoine, betaine, L-carnitine, sarcosine, N,N-dimethylglycine, triethylammonium acetate, glycerol phosphate, tricine, MOPSO, pentaerythritol and N-ethyl-N,N-bis-(2-hydroxyethyl)ammonium-N-4-butyl sulfonate, glycolic acid, lactic acid, malic acid and tartaric acid; and
(c) a sample treatment composition, wherein the borate composition and the stabilizer are present at a molar ratio of from about 10:1 to about 1:10,
and wherein the matrix is capable of preventing degradation of an isolated DNA fragment of at least 10 kilobases during substantially dry storage of the DNA fragment in the matrix at 85° C. for a time period of at least two weeks.