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DNA Isolation

DNA Isolation

DNA isolation protocols can be fast and straightforward or complex and time-consuming depending on the type and quality of DNA required for further processing. For example, plasmid DNA extraction is a bit more complicated than genomic DNA extraction because of the need for an appropriate lysis method to separate plasmid DNA from gDNA during isolation. However, for specific applications, such as long-range DNA sequencing that require a good yield of high- quality DNA samples, we need to follow...

DNA Isolation

DNA Isolation

DNA from cells is required for many biotechnology and research applications, such as molecular cloning. To remove and purify DNA from cells, researchers use various methods of DNA extraction. While the specifics of different protocols may vary, some general concepts underlie the process of DNA extraction.

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Related Experiment Video

Updated: Jan 7, 2026

Streamlined Purification of Plasmid DNA From Prokaryotic Cultures

Streamlined Purification of Plasmid DNA From Prokaryotic Cultures

Published on: January 5, 2011

Plasmid DNA Purification Using Filterprep With an Optional Endotoxin Removal Step.

Yu-Qian Lin¹, Yung-Chun Shih¹, Chung-Te Chang¹

¹Institute of Biochemistry and Molecular Biology, National Yang Ming Chiao Tung University, Taipei, Taiwan.

|December 26, 2025

Summary

This summary is machine-generated.

This study introduces a modified Filterprep method for rapid, cost-effective plasmid DNA purification. The enhanced protocol offers high yields and purity, with an optional step to reduce endotoxin levels for sensitive applications.

Keywords:

Endotoxin reduction Ethanol precipitation Modular protocol Molecular cloning Plasmid DNA purification Spin column Transfection-grade DNA

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Related Experiment Videos

Last Updated: Jan 7, 2026

Streamlined Purification of Plasmid DNA From Prokaryotic Cultures

Streamlined Purification of Plasmid DNA From Prokaryotic Cultures

Published on: January 5, 2011

Purifying Plasmid DNA from Bacterial Colonies Using the Qiagen Miniprep Kit

Purifying Plasmid DNA from Bacterial Colonies Using the Qiagen Miniprep Kit

Published on: July 29, 2007

Air-sampled Filter Analysis for Endotoxins and DNA Content

Air-sampled Filter Analysis for Endotoxins and DNA Content

Published on: March 7, 2016

Area of Science:

Molecular Biology
Biochemistry

Background:

Plasmid DNA purification is crucial for molecular biology applications.
Existing methods can be costly, time-consuming, or rely on proprietary reagents.
Endotoxin contamination can interfere with sensitive downstream applications.

Purpose of the Study:

To present a modified, transparent, and cost-effective Filterprep protocol for plasmid DNA purification.
To incorporate an optional endotoxin reduction step.
To provide a high-yield, high-purity DNA purification method adaptable to various laboratory settings.

Main Methods:

Modified Filterprep protocol combining ethanol precipitation and single-column filtration.
Elimination of chaotropic salts and silica binding.
Optional Triton X-114 wash step for endotoxin reduction.

Main Results:

Achieved high-purity plasmid DNA with yields up to fivefold higher than commercial kits.
Protocol completion in approximately 40 minutes under routine conditions.
Demonstrated suitability for molecular cloning, PCR, sequencing, and other applications.

Conclusions:

The modified Filterprep method is a simple, rapid, and cost-effective alternative for plasmid DNA purification.
The protocol is modular, extensible, and adaptable for various scales and downstream applications.
The optional endotoxin reduction step enhances its utility for sensitive experiments.