Kit for easy and odorless extraction of fecal nucleic acid and extraction method
A kit and feces technology, applied in DNA preparation, recombinant DNA technology and other directions, can solve the problems of inconvenient transportation and short storage time, and achieve the effects of eliminating odor, using safety, and solving transportation and storage difficulties.
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[0019] The preparation method of natural green tea extract essence, comprises the steps:
[0020] Weigh the green tea leaves and purified water with a weight ratio of (1.5~2.3):(3.5~5.5), then mix the green tea leaves and purified water, and soak for 36~48h under the condition that the vacuum degree is -0.050~-0.060MPa, Reheat and decoct for 2 to 3 hours, and filter to obtain the filtrate and filter residue. Decolorize the filtrate, and concentrate the filtrate according to the volume ratio of (90-110):1 (for example, 90-110 L before concentration and 1 L after concentration) to obtain green tea extract.
[0021] The preparation method of honeysuckle extract comprises the following steps:
[0022] The honeysuckle medicinal material was pulverized and extracted with a 50% (v / v) ethanol aqueous solution to obtain an extract. The extract that obtains is concentrated under reduced pressure to obtain medicinal extract, add water to dissolve, filter, and solution is concentrated t...
no. 1 example
[0039] The simple and odorless kit for extracting stool nucleic acid provided in this example is as follows.
[0040] The kit includes stool stabilizing solution, lysate, first washing solution, second washing solution, eluent and chromatographic column.
[0041] Specifically, the stool stabilization liquid contains 8mM Tris, 2M guanidine thiocyanate, 6mM ethylenediaminetetraacetic acid, 0.05mM sodium chloride, 0.5% chlorobutanol, 8% (m / m) green tea extract, 6% ( m / m) honeysuckle extract and 4% (m / m) enzyme.
[0042] The lysate contains 15mmol / L Tris-HCl (pH 3.3), 10mmol / L guanidine isothiocyanate, 5mmol / L sodium hydroxide, 85% (v / v) isopropanol, 4% (v / v) Triton X-100, 2% (m / m) catechins and 0.5 μg / mL CarrierRNA.
[0043] The first washing solution contained 65 mmol / L Tris-HCl, 50% (v / v) ethanol and 0.5% (m / m) DTT.
[0044] The second washing solution contains 30mmol / L sodium acetate solution and 75% ethanol.
[0045] The eluate contains 30mmol / L Tris-HCl (pH 8), 3mmol / L E...
no. 2 example
[0048] This example provides a simple and odorless method for extracting stool nucleic acid.
[0049] (1) Human genomic DNA from stool samples
[0050] Stool sample processing steps
[0051] Take 0.2-0.4g of stool sample into a 2mL centrifuge tube. If the sample is in a liquid state, draw 0.2mL of the liquid sample into a 2mL centrifuge tube, add 0.65mL of the stool stabilization solution provided in the first embodiment to the sample, and vortex at the highest 1 minute to break up the sample. The samples can be stored in the stable solution for 15 days at room temperature, which is convenient for actual transportation and does not affect the subsequent detection of the samples.
[0052] protein cleavage step
[0053] Centrifuge at 13,000ⅹg for 10 minutes at room temperature. Then, transfer 500 μL of the supernatant to a 2 mL centrifuge tube, and add 20 μL of Proteinase K and the lysate provided in the first example to the supernatant. Inverted and mixed to obtain a mixtu...
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