
- Description
- Additional Information
- Readable Documents
- Assay Principle
- Reviews
Key Benefits
- Cell permeable.
- No wash homogenous assay.
- Adaptable to High throughput assay platforms .
- Real time detection of NO activity.
- Applications – Flow Cytometry, Fluorescence Plate Reader, Fluorescence Microscopy
Additional information
Kit Size | 0.125mg, 0.25mg |
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Diaminofluorescein –2 Diacetate (DAF-2DA) is a non-fluorescent cell permeable reagent that can measure free Nitric Oxide (NO) and nitric oxide synthase (NOS) activity in living cells under physiological conditions. Once inside the cell the diacetate groups on the DFA-2DA reagent arehydrolyzed by cytosolic esterases thus releasing FAD-2 and sequestering the reagent inside the cell. Production of nitric oxide converts the non-fluorescent dye, DAF-2, to its fluorescent triaole derivative, DAF-2T.
DAF-2T can be observed by: excitation 488nm and measuring emission at 515nm.
Fig. 1. DAF-2DA, the non-fluorescent probe, enters the cells where cytosolic esterases hydrolysis the diacetate groups, releasing the non-fluorescent DAF-2 dye. DAF-2 then reacts with NO and O2 to produce DAF-2T, its triazole fluorescent derivative.
Fig. 2. Phase Contrast and fluorescent microscopic images of rat aorta-derived vascular smooth muscular cells loaded with DAF-2DA.
Document Title |
NOSProtocol |
NOS Datasheet |
msds.NOS |
Title | File | Link | Author(s) | Journal | Year; Edition:Pages |
Red wine consumption improves in vitro migration of endothelial progenitor cells in young, healthy individuals | Am J Clin Nutr 2010 92: 1 | July 2010; 161-169 |
Reference |
Direct evidence of NO production in rat hippocampus and cortex using a new fluorescent indicator: DAF-2 DA: H. Kojima, et al.; Neuroreport 9, 3345 (1998) Abstract |
Direct evidence of nitric oxide production from bovine aortic endothelial cells using new fluorescence indicators: diaminofluoresceins: N. Nakatsubo, etal.; FEBS Lett. 427, 263 (1998) Abstract |
Nitric Oxide Ameliorates Hydrophobic Bile Acid-induced Apoptosis in Isolated Rat Hepatocytes by Non-mitochondrial Pathways: E. Gumpricht, et al.; J. Biol.Chem. 277, 25823 (2002) Full Text; http://www.jbc.org/cgi/content/full/277/28/25823#SEC1 |
Development of a fluorescent indicator for nitric oxide based on the fluoroscein chromophore: H. Kojima, et al.; Chem. Pharm. Bull. 46, 373 (1998)Abstract |
Detection and imaging of nitric oxide with novel fluorescent indicators: diaminofluoresceins: H. Kojima, et al.; Anal. Chem. 70, 2446 (1998) Abstract |
Part# | Reagent | Temperature |
Part# 4006 | DAF-2DA, 1 Vial (NOS200-1) | 2-8C |
Part# 4006 | DAF-2DA, 2 Vials (NOS200-2) | 2-8C |
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和RevertAid™HMinusFirstStrandcDNASynthesisKit,FirstStrandcDNASynthesisKit
大家又没有用过,这个公司的酶据说很好啊。
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。
TAKARA的RR047A逆转录试剂盒,做逆转录程序设置错误本来应该37℃15min85℃5s,变成37℃15s,85℃
5s,请问再重新设置程序可以吗,85℃酶会全部失活吗?

