UltraBio™ DNA长度分选磁珠

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D751553-1ml
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D751553-100ml
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DNA纯化胶回收 (2)

基本描述

稳定性与储存 4℃保存,一年有效。
英文名称 UltraBio™ DNA Size Selection Magnetic Beads
储存温度 2-8°C储存
运输条件 冰袋运输
产品介绍

阿拉丁研发生产的UltraBio™ DNA长度分选磁珠(UltraBio™ DNA Size Selection Magnetic Beads)是基于固相载体可逆化固定(Solid Phase Reverse Immobilization, SPRI)技术,使用新型核酸纯化介质包被的磁珠,配合优化的缓冲体系,在特定比例的磁珠悬液中分离纯化出特定长度范围核酸片段的产品。本产品适合用于回收、分离或纯化大于100bp的特定长度范围内的DNA或RNA片段,特别适合用于高通量测序文库构建时DNA或RNA的长度分选。通过调整本产品的用量以及通过单侧或双侧(一次或两次)分离纯化,可以实现不同长度范围DNA的分离纯化。核酸纯化和杂质的去除对于基因组相关实验的进行是非常重要的,包括测序、qPCR/ddPCR/PCR、微阵列(Microarray)和其它酶促反应等1]。本产品广泛应用于基因测序以及分子诊断等领域,尤其适用于二代测序(Next generation sequencing, NGS)文库构建过程中的DNA或RNA长度分选、纯化。本产品兼容常规的建库试剂盒,使用方法、片段回收率和大小分布与目前广泛使用的Agencourt AMPure XP Beads (Beckman Coulter公司产品)高度一致。DNA长度分选磁珠,也被称为DNA长度分选纯化磁珠、DNA片段分选磁珠、DNA分选磁珠、DNA筛选磁珠、DNA Clean Beads、NGS Clean-up and Size Select、DNA Selection Beads、DNA Select Isolation Kit、Sample Purification Beads等。本产品的具体工作原理如下。产品体系为含磁珠和聚乙二醇(PEG)等物质的盐溶液。在一定浓度的盐溶液与PEG环境下,DNA分子构象会发生变化,暴露出大量的磷酸基团,与羧基(-COOH)包被的磁珠结合。随后通过磁性分离,当PEG和盐被去除后, DNA就可以从磁珠上被洗脱,得到经过分离纯化的DNA。实验过程中通过控制缓冲液中PEG和盐的浓度,可以将不同大小的DNA片段结合到磁珠上并进行纯化1-2]。本产品进行DNA长度分选的实验流程参考图1。图1. 阿拉丁的UltraBio™ DNA长度分选磁珠的实验流程示意图。本产品特异性强、DNA结合量高。本产品DNA结合速度快、结合量高,不同大小的核酸片段可以快速进行分离纯化。而且磁珠粒径小,不易产生非特异吸附,可以快速有效去除未掺入的dNTP、引物、引物二聚体、盐和其它污染物。本产品兼容性强。本产品不仅适用于少量样本的手工操作,也适用于高通量的自动化操作系统。本产品分选长度范围便捷、效率高。本产品可通过调整磁珠用量从而调整分选DNA长度的范围以适应不同实验的需求。不同批次之间结果具有一致性。分选片段范围与实验预设一致,实验结果可预测。本产品操作简单。本产品采用磁性分离,无需离心,有助于保留核酸的完整性,DNA片段纯化回收率高。本产品安全环保。与传统的DNA回收方法相比,避免了酚、氯仿等有机溶剂的使用,更加安全。4℃保存,一年有效。尽管本产品在使用方法、片段回收率等方面与其他公司同类产品相似,但仍建议进行一定的测试和优化。本产品避免冷冻、避免高速离心。为保证DNA的回收率,使用前须将磁珠由4℃冰箱取出,或取所需量,使其温度平衡至室温后再使用。分装或使用磁珠时,请适当漩涡震荡或充分颠倒以保证磁珠充分混匀。80% (v/v)乙醇溶液推荐现用现配,否则后续使用时可能会因为乙醇的挥发而影响回收效率。DNA样品初始体积须大于100μl,不足时请用超纯水补齐至100μl。因为样品体积过小,将导致磁珠与样品孵育不均、移液误差增大,进而影响分选的准确性。请勿长时间干燥磁珠,干燥过度将导致磁珠不可逆的聚集,从而降低洗脱效率。本产品仅限于专业人员的科学研究用,不得用于临床诊断或治疗,不得用于食品或药品,不得存放于普通住宅内。为了您的安全和健康,请穿实验服并戴一次性手套操作。


使用说明

1.准备工作:a.将磁珠溶液从4℃冰箱取出,适当漩涡震荡或充分颠倒以保证磁珠充分混匀,然后取出所需的量,使其平衡至室温。b.新鲜配制80% (v/v)乙醇溶液。例如分别量取8ml无水乙醇和2ml超纯水或双蒸水,混匀后即得约10ml 80% (v/v)乙醇溶液。注:因为乙醇和水混合后体积会发生改变,所以请勿量取8ml乙醇,加超纯水或双蒸水定容至10ml。2.DNA单侧长度分选(Single-sided size selection)。单侧长度分选法主要用于去除短片段DNA,特别是100bp或200bp以下的DNA片段,如引物或接头二聚体等,以及去除酶、dNTP和盐溶液等。一般来说,磁珠用量体积比越高,短片段DNA与磁珠的结合率越高,因此可以通过调整磁珠用量,可以去除不同长度范围的短片段DNA。Size-selection of DNABead Volumes≥1000bp0.5X≥300bp1.0X≥200bp1.2-1.5X≥100bp2.0-3.0X注1:此磁珠用量为参考用量,也可参考已使用的方法并根据实际测试结果进行适当的调整。表中“X”表示DNA样品体积。例如:DNA样品体积为100μl,如果需要纯化≥1000bp的DNA片段,则磁珠用量为0.5X = 0.5×100μl = 50μl。注2:此处的长度范围是指大部分DNA片段范围,仍然可能含有少量低于该长度的短片段。a.轻柔涡旋震荡或上下颠倒以保证磁珠充分混匀,参考上表在DNA样品溶液中加入相应体积磁珠。b.轻柔涡旋震荡或移液器吹打10次混匀,室温孵育5min。c.将离心管短暂低速离心后置于磁力架中分离5min,待溶液澄清后,小心移除上清。d.保持离心管始终处于磁力架中,加入200μl新鲜配制的80% (v/v)乙醇溶液漂洗磁珠,室温孵育30秒,小心移除上清。e.重复步骤d一次。f.保持离心管始终处于磁力架中,打开离心管盖,室温干燥至磁珠刚刚出现龟裂(约5-10min)。g.将离心管从磁力架中取出,加入适量超纯水或双蒸水(≥20μl),漩涡振荡或使用移液器轻轻吹打以充分混匀。h.室温孵育5min。i.将离心管短暂低速离心后置于磁力架中分离5min,待溶液澄清后,小心吸取上清至洁净的离心管中,即完成DNA片段的纯化。使用本产品进行DNA片段的纯化效果参考图2。 图2. 阿拉丁的 DNA长度分选磁珠用于DNA片段纯化(单侧长度分选法)的效果图。100μl的样品(含总量为2μg的DNA,大小为100-10,000bp),分别加入0.5X-3X体积的分选磁珠,进行DNA片段纯化。20μl纯化产物加入4μl DNA上样缓冲液(6X) ,使用1%琼脂糖凝胶进行电泳检测。实际效果会因样品种类、检测仪器等的不同而存在差异,图中效果仅供参考。3.DNA双侧长度分选(Double-sided size selection)。二代测序的DNA文库一般要求长度在300-500bp之间,所以需要去除大片段DNA和非常小的DNA片段,此时可以通过双侧长度分选(双轮分选法)对DNA片段进行分选。通常第一轮分选的目的是去除大片段DNA,所以也被称为右侧清除(Right-side clean-up);第二轮分选的目的是去除小片段DNA,所以也被称为左侧清除(Left-side clean-up)。通过两轮分选,可以把DNA片段控制在适当的长度范围内。下表为DNA长度分选的参考条件。Size-selection of DNA200-300bp300-400bp400-500bp500-600bp600-1000bpBead Volumes for Round 10.85X0.7X0.65X0.58X0.5XBead Volumes for Round 2(0.15~0.3)Y(0.05~0.2)Y注:此磁珠用量为参考用量,推荐参考已使用的方法并根据实际测试结果进行适当的调整,特别是第二轮的磁珠用量。表中“X”表示DNA样品体积,“Y”表示DNA样品体积和第一轮磁珠用量之和。例如:DNA样品体积为100μl,如果需要分选200-300bp的DNA片段,则第一轮磁珠用量为0.85X = 0.85×100μl = 85μl,第二轮磁珠用量V2为(0.15~0.3)×(100μl+85μl) = 27.75~55.5μl;a.轻柔涡旋震荡或上下颠倒以保证磁珠充分混匀,参考上表在DNA样品溶液中加入第一轮磁珠用量(Bead Volumes for Round 1)。b.轻柔涡旋震荡或移液器吹打10次混匀,室温孵育5min。c.将离心管短暂低速离心后置于磁力架中分离5min,待溶液澄清后,小心转移上清到新的离心管中。注:转移上清时,切勿将上清全部吸出,请残留2μl于管底,避免吸到磁珠从而影响DNA长度分选效果。d.参考上表向上清中加入第二轮磁珠用量(Bead Volumes for Round 2)。e.轻柔涡旋震荡或移液器吹打10次混匀,室温孵育5min。f.将离心管短暂低速离心后置于磁力架中分离5min,待溶液澄清后,小心移除上清。g.保持离心管始终处于磁力架中,加入200μl新鲜配制的80% (v/v)乙醇溶液漂洗磁珠,室温孵育30秒,小心移除上清。h.重复步骤g一次。i.保持离心管始终处于磁力架中,打开离心管盖,室温干燥至磁珠刚刚出现龟裂(约5-10min)。j.将离心管从磁力架中取出,加入适量超纯水或双蒸水(≥20μl),轻柔涡旋震荡或使用移液器轻轻吹打以充分混匀。k.室温孵育5min。l.将离心管短暂离心后置于磁力架中分离5min,待溶液澄清后,小心吸取上清至洁净的离心管中,即完成双侧法DNA长度分选。可取少量分选后的样品电泳检测DNA片段长度,然后-20℃保存。使用本产品进行DNA长度分选的效果参考图3。 图3. 阿拉丁的 DNA长度分选磁珠用于DNA长度分选(双侧分选法)的效果图。100μl的样品(含总量为1μg的DNA,大小为100-10,000bp),按照上表加入分选磁珠,进行双侧法DNA长度分选。20μl分选产物加入4μl DNA上样缓冲液(6X) ,使用1%琼脂糖凝胶进行电泳检测。实际效果会因样品种类、检测仪器等的不同而存在差异,图中数据仅供参考。参考文献:1. Ivo Nikolaev Sirakov. From Basic Aspects to Laboratory Tools, IntechOpen. 2016. Chapter 1.2. Hawkins T L, O'Connor-Morin T, Roy A, Santillan C. Nucleic Acids Res. 1994. 22(21):4543-4.3. Quail M A, Gu Y, Swerdlow H, Mayho M. Electrophoresis. 2012. 33(23):3521-3528.

Aladdin's UltraBio™ DNA Size Selection Magnetic Beads are developed based on the SPRI (Solid Phase Reverse Immobilization) technology and are applicable for DNA purification and size selection during the preparation of next generation sequencing (NGS) libraries. DNA size selection can be achieved by adjusting the amount of this product in DNA samples.Nucleic acid purification are essential for genome-related experiments such as qPCR/ddPCR/PCR, microarray and enzymatic reactions [1]. This product recovers DNA or RNA fragments greater than 100bp with consistency and high reproducibility. It is compatible with conventional library preparation kits and widely used in DNA sequencing and molecular diagnostics, especially in DNA or RNA purification and size selection during NGS library preparations. The yield and size distribution of NGS libraries obtained by using this product are highly consistent with those obtained from AMPure XP Beads (Beckman Coulter).The working mechanism of this product


Precautions

Although this product is similar to other products with similar functions in terms of usage and recovery rate, optimizations is still recommended for a particular experiment..Do not freeze this product or centrifuge this product at high-speed.The 80% (v/v) ethanol is recommended to be prepared fresh. Otherwise the recovery efficiency may decrease due to the evaporation of ethanol.The initial volume of the DNA sample must be greater than 100μl. If not, fill to 100μl with the ultrapure wate. If the sample volume is too small, the incubation of the beads and the sample will be uneven and the pipetting error will increase, thereby affecting the accuracy of size selection.This product is for R&D only. Not for drug, household, or other uses.For your safety and health, please wear a lab coat and disposable gloves during the operation.


Instructions for Use

1. Preparation of magnetic beadsa. Take the magnetic beads at 4℃, vortex or upside down properly to resuspend the beads thoroughly. Take the required amount of beads and equilibrate to room temperature.b. Prepare the 80% (v/v) ethanol solution right before use. For example, mix 8 ml of absolute ethanol and 2 ml of ultrapure water to obtain ~10 ml of 80% (v/v) ethanol.Note: Because the volume of ethanol and water will change after mixing, please do not measure 8ml of ethanol and add ultrapure water to make up the volume to 10ml.2. Single-sided DNA size selectionThe single-sided size selection method is mainly used to remove short DNA fragments, especially those shorter than 100bp or 200bp, such as primers or adaptor dimers, and to remove enzymes, dNTPs and salts. Generally, the higher the volume ratio of magnetic beads, the higher the binding rate of short DNA fragments to magnetic beads. Therefore the amount of magnetic beads can be adjusted to remove short DNA fragments in different length ranges.Size-selection of DNABead Volumes≥1000bp0.5X≥300bp1.0X≥200bp1.2- 1.5X≥ 100bp2.0-3.0XNote 1: The amounts of beads in the table above are for reference, and can be adjusted according to the actual test results. For example, if the volume of DNA sample is 100μl, and if a DNA fragment ≥1000bp needs to be purified, the amount of beads is 0.5X= 0.5×100μl = 50μl.Note 2: The length range here refers to the majority of the DNA fragments. Some DNA fragments outside the range may still remain.a. Gently vortex or invert the tube to resuspend the beads thoroughly. Add an appropriate volume of beads to the DNA solution according to the table above.b. Mix well by vortex or pipetting up and down for 10 times. Incubate at room temperature for 5 minutes.c. Spin the tube briefly and place it on a magnetic stand to separate beads from supernatnat for 5 minutes. After the solution is clear, aspirate the supernatant carefully.d. Keep the tube in the magnetic stand, add 200μL of freshly prepared 80% (v/v) ethanol without disturbing the beads, and incubate at room temperature for 30 seconds. Aspirate and discard the ethanol.e. Repeat step d once.f. Keep the tube in the magnetic stand, air dry the beads with the lid open until cracks just appear (5-10 minutes).Note: Do not over-dry the beads, which may result in lower elution efficiency.g. Remove the tube from the magnetic stand. Add an appropriate amount of ddH2O (≥20 μL) and mix thoroughly by vortex or pipetting.h. Incubate at room temperature for 5 minutes.i. Spin the tube briefly and place it on a magnetic stand for 5 minutes. After the solution is clear, transfer 20μL of the supernatant to a new microcentrifuge tube. Please refer to Figure 2 for the performance of this product in DNA purification.Figure 2. Single-sided size selection of DNA using DNA Size Selection Magnetic Beads . DNA in 100μl solution (2μg DNA, 100-10000bp) was purified by adding 0.5X-3X volumes of beads, respectively. A small amount of the purified products was mixed with DNA loading buffer (6X) ( DNA Size Selection Magnetic Beads . DNA in 100μl solution (1μg DNA, 100-10000bp) was purified following this protocol. A small amount of purified products was mixed with DNA loading buffer (6X) (, D0071) and examined by 1% agarose gel electrophoresis. This figure is for reference only, which may vary due to different experimental conditions.


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