Protecting method of exogenous DNA (deoxyribonucleic acid) internal standard substances in liquid products and application of exogenous DNA internal standard substances
An internal standard and product technology, applied in the field of anti-counterfeiting identification, can solve the problems of changing the physical and chemical properties of the product, difficult to apply, and high cost, and achieve the effects of low cost, convenient mass production, and easy availability of raw materials
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Embodiment 1
[0041]Example 1 Oligochitosan and spermine improve the tolerance of lambda DNA to DNase I
[0042] 1. Preparation of chitosan oligosaccharide and spermine solution
[0043] Preparation of chitosan oligosaccharide solution: Accurately weigh 150 mg chitosan oligosaccharide (purchased from Laizhou Haili Biological Products Co., Ltd., Shandong Province; batch number: HL130317G; molecular weight: 6500 Da; degree of deacetylation: 91.1%), add 8 mL of hydrochloric acid with pH 2.0 solution to completely dissolve the chitosan oligosaccharide, and then adjust the pH value of the solution to 7.0 with 0.1M sodium hydroxide solution. Finally, dilute to 10 mL with sterilized ultrapure water and store at 4°C. Dilute with sterilized ultrapure water to the concentration of the required working solution.
[0044] Preparation of spermine solution: Accurately weigh 100 mg of spermine (purchased from Sigma-Aldrich; product number: S3256), dissolve it in 8 mL of sterilized ultrapure water, dilut...
Embodiment 2
[0053] The protection of chitosan to polyoligonucleotide in embodiment 2 lactic acid drink
[0054] 1. Preparation of exogenous single-stranded polyoligonucleotide and chitosan complex
[0055] Preparation of chitosan solution: Accurately weigh 250 mg of chitosan (purchased from Zhejiang Aoxing Biotechnology Co., Ltd.; batch number: 20140220; molecular weight: 50-100 kDa), add 20 mL of sterilized ultrapure water, and stir magnetically for 2 h at room temperature. Fully hydrate the chitosan powder. To the hydrated chitosan solution, 20 mL of pH 2 hydrochloric acid solution was gradually added dropwise, and magnetically stirred overnight to fully dissolve it. Subsequently, its pH was adjusted to 7.0 using 0.1 M sodium hydroxide solution. Finally, dilute to 100 mL with sterilized ultrapure water and store at 4 °C. Dilute with sterilized ultrapure water to the concentration of the required working solution.
[0056] Mix the single-stranded polyoligonucleotide (36mer, the seque...
Embodiment 3
[0062] Example 3 The protection of chitosan, chitooligosaccharide and spermine in liquor to pUC18 plasmid DNA
[0063] 1. Preparation of exogenous plasmid DNA and chitosan, chitosan oligosaccharide and spermine complex
[0064] Preparation of chitosan solution: Accurately weigh 250 mg of chitosan (purchased from Sigma-Aldrich; item number: 740500; molecular weight: 110-150 kDa), add 20 mL of sterilized ultrapure water, and stir magnetically for 2 h at room temperature to make chitosan The powder hydrates well. To the hydrated chitosan solution, 20 mL of pH 2 hydrochloric acid solution was gradually added dropwise, and magnetically stirred overnight to fully dissolve it. Subsequently, the pH was adjusted to 7.0 using 0.1 M sodium hydroxide solution. Finally, dilute to 100 mL with sterilized ultrapure water and store at 4 °C. Dilute with sterilized ultrapure water to the concentration of the required working solution.
[0065] Preparation of chitosan oligosaccharide solution...
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