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In the center of molecular biology is one species of molecules: DNA.
DNA molecules are amplified and introduced into organisms by transformation or transfection, separated, stained, examined under the microscope, manipulated, sequenced and so on.
For all these techniques the initial step is to isolate DNA from the origin of interest.
This page provides you an overview of the different methods for nucleic acid isolation and offers a number of must-have reagents to obtain pure DNA and/or RNA from various sources.

Introduction
What does it mean technically when we talk about DNA extraction, isolation or purification - terms often used synonymously for getting preferably pure DNA from a sample? What are the mechanisms behind? How is it possible to separate distinct species of DNA?
On this page we focus on the isolation of the two DNA species that are mainly isolated in molecular biology labs - genomic DNA and bacterial plasmids. We give an overview about established DNA isolation techniques, their chemical background and we discuss their respective advantages and limitations.

Regarding the basic procedure, DNA extraction is simple and can be done using domestic products. Basically, all you require is a rich source of DNA, salt, water, dishwashing detergent, a coffee filter, high-proof alcohol and a stick to spool the precipitated DNA salt out of solution. For higher demands (regarding quantity and quality), of course, the method requires further refinement.
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Thumbnail Catalog Description Packaging Specification
A5194 DNA Marker Phage Lambda - Sty I 50 ¥ìg • Fragment sizes in bp: 19329*; 7743; 6223; 4254*; 3472; 2690; 1882, 1489; 925; 421; 74 • Number of bands: 11 Concentration: 0.2 - 0.5 mg/ml
A3481 Loading buffer DNA IV (for Agarose gels) 10 ml / 25 ml Composition: Bromophenol blue: 0.25 % EDTA ¡¤ Na2 (pH 8.0): 100 mM Ficoll¢ç 400: 20 % SDS: 1.0 % Xylene cyanol FF: 0.25 %
A9555 DNA-Dye NonTox 1 ml ♦ nonhazardous Ethidium bromide substitute • Loading buffer with highly sensitive DNA dye • contains three tracking dyes • Visualization of DNA with blue light und UV light
A5193 DNA Isolation Spin-Kit Agarose 50 Isolations Kit for the DNA isolation from agarose gels with spin minicolumns • Application of the DNA in cloning and sequencing • performance of the electrophoresis in either TAE or TBE buffer • Binding capacity of the columns 10 ¥ìg • Isolation of DNA fragments in the range of 100 to 6000 bp
A3660 DNA Ladder Mix 100 - 5000 (lyophilised) 50 ¥ìg • Number of bands: 17 • Fragment sizes in bp: 5000; 4000; 3000; 2500; 2000; 1500; 1000; 900; 800; 700; 600; 500 (x2); 400; 300; 200; 150; 100 • supplied with loading buffer (1X) • recommended loadings: 0.5 - 0.8 ¥ìg/lane • extremely stable: storage for at least 4 years at -20¡ÆC possible
A2279 Phenol stabilized : Chloroform : Isoamyl Alcohol 25 : 24 : 1 100 ml / 500 ml pH (20¡ÆC): approx. 5.0 Heavy metals: max. 0.0005 % Water (K.F.): approx. 5 % Stability: approx. 12 months Composition: Chloroform: 480 ml/L Isoamyl Alcohol: 20 ml/L Phenol liquid: 500 ml/L
A2273 Ethidium Bromide solution 0.07 % "dropper-bottle" 1239-45-8 5 ml / 15 ml CAS No. 1239-45-8 / Liquid / M.W 394.33 g/mol
A0944 Phenol non stabilized : Chloroform : Isoamyl Alcohol 25 : 24 : 1 100 ml / 500 ml pH (20¡ÆC): approx. 5.0 Heavy metals: max. 0.0005 % Water (K.F.): approx. 5 % Stability: approx. 9 months Composition: Chloroform: 480 ml/L Isoamyl Alcohol: 20 ml/L Phenol liquid: 500 ml/L
A0881 DEPC BioChemica 20 ml / 50 ml / 100 ml CAS No. 1609-47-8 / Liquid / M.W 162.14 g/mol
A0447 Phenol water-saturated, stabilized + separate Tris - Solution 108-95-2 500 ml CAS No. 108-95-2 / Liquid

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