Kit for extracting free DNA
The technology of a kit and a magnetic separator is applied in the field of high-throughput DNA detection, which can solve the problems of low extraction efficiency, inability to separate large and small fragments in plasma, and inability to separate DNA fragments, and achieves the effects of high recovery rate and simple operation.
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Example Embodiment
[0059] Embodiment 1 A kind of method for extracting large fragment cell-free DNA (greater than 500bp) in plasma
[0060] Using different volume concentration gradients of isopropanol (2%, 4.5%, 7%, 9.5%, 12%), one-step magnetic bead binding was used to extract large fragments of free DNA.
[0061] Experimental system (100l plasma+230μl detection reagent), detection reagents include proteinase K, magnetic beads, isopropanol and BindingBuffer. Plasma: DNA fragments of known concentrations of 127bp and 208bp were spiked into the plasma of healthy people, and the two fragments were used as standards. Final concentrations are 0ng / ml, 7.5ng / ml, 15ng / ml, 30ng / ml, 60ng / ml, 120ng / ml. Do 3 parallels for each sample.
[0062] The specific method for extracting large fragment DNA (>500bp) is as follows:
[0063] (1) Add 10 μl proteinase K, 20 μl magnetic beads, (6.6 μl isopropyl alcohol and 193.6 μl BindingBuffer; 15 μl isopropyl alcohol and 185 μl BindingBuffer; 31.5 μl isopropyl alco...
Example Embodiment
[0072] Embodiment 2 A kind of method for extracting small fragment cell-free DNA (less than 500bp) in plasma
[0073]1. Secondary binding Refer to the method described in Example 1 (ie, the primary binding method), add (20 μl of magnetic beads and 189 μl of isopropanol) to the supernatant obtained in step (1) in Example 1, respectively; 20 μl of magnetic beads and 230 μl of isopropanol; 20 μl of magnetic beads and 286 μl of isopropanol; 20 μl of magnetic beads and 350 μl of isopropanol, 20 μl of magnetic beads and 428 μl of isopropanol) vortex to mix evenly, isopropanol. The volume concentrations of propanol were 36%, 41%, 46%, 51%, and 56%, respectively. The centrifuge tube was allowed to stand at room temperature for 10 min. The centrifuge tube was placed on a magnetic separator for 2 min, and the supernatant was removed with a pipette.
[0074] 2. Washing (1) Add 600 μl Washing Buffer I, and slowly pipette the magnetic beads 10 times with a pipette to fully resuspend the ...
Example Embodiment
[0079] Example 3 Assembly and application of the kit for extracting cell-free DNA
[0080] The kit of the present invention contains magnetic beads, proteinase K, isopropanol, BindingBuffer, standard substances and other commonly used reagents for washing and elution of magnetic beads.
[0081] According to the records of Examples 1 and 2, the working procedure of the kit of the present invention is as follows:
[0082] 1. Separation of human peripheral blood plasma or urine.
[0083] 2. One-time binding, washing, drying and elution of magnetic beads and extraction of DNA.
[0084] In 100 μl of plasma, 10 μl of proteinase K, 185 μl of BindingBuffer, 15 μl of isopropanol and 20 μl of magnetic beads were added, and the mixture was vortexed and mixed evenly. Place the centrifuge tube at 55°C and heat for 10min (invert and mix once during the period). Place the centrifuge tube on the magnetic separator for 2 min, pipette the supernatant into another new 1.5ml centrifuge tube, a...
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