
- Extract total RNA (including microRNA) from FFPE samples
- No phenol extraction step
- Includes DNase for optional on-column DNA removal
- Isolated RNA is of the highest quality and integrity
- Isolate a diversity of RNA species
- Purified RNA is suitable for a variety of downstream applications, including Small RNA Sequencing. Find out more information on Norgen"s NGS services
- Buffer chemistry inactivates viruses including SARS-CoV-2 - Explore the Application Note
FFPE RNA Purification Kit
Norgen’s FFPE RNA Purification Kit provides a rapid method for the isolation and purification of total RNA (including microRNA) from formalin-fixed paraffin-embedded (FFPE) tissue samples in as little as 1 hour. Using formalin to fix tissues leads to crosslinking of the RNA and proteins, and the process of embedding the tissue samples can also lead to fragmentation of the RNA over time. Norgen’s FFPE RNA Purification Kit provides conditions that allow for the partial reversing of the formalin modifications, resulting in a high quality and yield of RNA. The kit is able to purify all sizes of RNA, from large mRNA and ribosomal RNA down to microRNA (miRNA) and small interfering RNA (siRNA), depending on the age of the FFPE tissue as fragmentation of the RNA is known to occur over time.
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逆转录(reverse transcription)是以RNA为模板合成DNA的过程,即RNA指导下的DNA合成。此过程中,核酸合成与转录(DNA到RNA)过程与遗传信息的流动方向(RNA到DNA)相反,故称为逆转录。逆转录过程是RNA病毒的复制形式之一,需逆转录酶的催化。 逆转录过程的揭示是分子生物学研究中的重大发现,是对中心法则的重要修正和补充。人们通过体外模拟该过程,以样本中提取的mRNA为模板,在逆转录酶的作用下,合成出互补的cDNA,构建cDNA文库,并从中筛选特异的目的基因。该方法已成为基因工程技术中最常用的获得目的基因的策略之一。
首先,不否认它比大多数国产的试剂盒做得好,提取的纯度、方便度和量,都还很不错。
其次,它是日本的。so我觉得实验室用用天根的,就非常好了。拒绝日货,从实验室做起。
向左转|向右转
一、cDNA第二链的合成:
1. 第一链反应完成后,取2ul一链产物-20℃冰箱中保存,待电泳检测。其余的产物合并,混匀,然后顺序加入下列试剂(promega):
20ul 10×DNA Polymerase I buffer
6ul10mM dNTP(自己配制)
xuldd H2O
1ulRNase H(2U/ul)
10ul DNA Polymerase I(10U/ul)
总体系为200ul;
2. 混匀后,16℃反应2.5小时;
3. 70℃灭活10分钟;
4. 反应完成后,得到200ul cDNA第二链反应体系,将此体系置于冰上;
5.取2ul二链产物,同保存的一链产物一起电泳鉴定。同时上1kb ladder,确定双链的大小范围。
注:一链,二链的电泳图是smear,且二链稍比一链大一些。
二、双链cDNA末端补平:
1. 在第二链反应体系中,顺序加入下列试剂(promega):
6ul 10mM dNTP
2ul T4 DNA Polymerase(8.7U/ul)
2ul BSA(10mg/ml)
2. 稍微离心混匀反应物, 37℃反应至少30分钟,然后75℃灭活10分钟;
3. 加入等体积酚/氯仿/异戊醇,剧烈振荡后,常温下13000g离心5分钟;
4. 离心后,吸取上清于另一1.5ml eppendof管中,加入等体积氯仿,上下颠倒几次混匀后,常温下13000g离心5分钟;
5. 吸取上清至另一eppendof管,加入1/10V3M NaAc(PH5.2)和2.5V预冷的无水乙醇,混匀,-20℃放置过夜以沉淀双链cDNA;
6. 第二日,将昨日沉淀物在4℃,13000g离心60分钟以充分沉淀双链cDNA;
7.离心完毕,弃上清,加入1ml 70%乙醇洗涤沉淀,常温下13000g离心5分钟;
8.离心完毕,弃上清,干燥沉淀至无乙醇气味.
注:第3,第4步可以用PCR 纯化试剂盒代替。
PCR纯化试剂盒操作流程:
1.溶液PE使用前应加入适量体积95%-100%的乙醇,混匀。
2.向200ul二链补平产物中加入5倍体积的buffer PB,混匀。
3.加入spin column中,13000rpm离心1min。
4.加入0.75ml buffer PE,13000rpm离心1min。
5.13000rpm,再离心1min。
6.将spin column放入一新的离心管中,加入50ul buffer EB,静置10min。
7.13000rpm离心2min。
8.加入30ul buffer EB,静置10min。
9.13000rpm离心2min。
10.加入1/10体积3M的NaAc,2.5倍体积无水乙醇,混匀,-20℃沉淀过夜。

