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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...
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DNA Extraction from 0.22 &mu;M Sterivex Filters and Cesium Chloride Density Gradient Centrifugation
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DNA Extraction with TRIzol Reagent Using a Silica Column.

Bo-Han Yang1, Bao-Shan Liu1, Ze-Liang Chen1

  • 1Key Laboratory of Livestock Infectious Diseases in Northeast China, Ministry of Education, College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenyang City, Liaoning Province, 110866, China.

Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry
|November 30, 2020
PubMed
Summary

This study presents a faster TRIzol-modified DNA extraction method for tissues. The new protocol significantly reduces time while maintaining DNA quality and performance in downstream molecular assays.

Keywords:
DNAextractionsilica columnsimplifytrizol

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Area of Science:

  • Molecular Biology
  • Biochemistry

Background:

  • TRIzol reagent is a common solution for isolating nucleic acids and proteins.
  • Traditional TRIzol DNA extraction is effective but time-consuming.
  • Optimizing DNA extraction protocols is crucial for efficient molecular biology workflows.

Purpose of the Study:

  • To develop a modified TRIzol DNA extraction method that is faster than the classic procedure.
  • To evaluate the yield and purity of DNA extracted using the modified method.
  • To assess the performance of the extracted DNA in downstream applications like quantitative PCR.

Main Methods:

  • A modified TRIzol protocol was developed incorporating a silica column for DNA purification.
  • DNA was extracted from tissue samples using the modified TRIzol method, classic TRIzol method, and a commercial kit (DNAiso).
  • DNA purity and concentration were assessed using spectrophotometry (260/280 nm and 260/230 nm ratios).
  • The functional integrity of the extracted DNA was validated through restriction enzyme digestion and quantitative PCR (qPCR).

Main Results:

  • The modified TRIzol method reduced DNA extraction time by approximately two-thirds compared to the classic procedure.
  • Spectrophotometric analysis indicated that the DNA purity (260/280 and 260/230 ratios) from the modified method was comparable to the classic and commercial methods.
  • DNA extracted using the modified TRIzol method performed equivalently to DNA from the classic method in restriction enzyme digestion and qPCR assays.

Conclusions:

  • The TRIzol-modified method offers a significantly faster and simplified approach for DNA extraction from tissues.
  • This optimized protocol yields high-quality DNA suitable for various molecular biology applications.
  • The method provides a valuable alternative for researchers needing efficient DNA isolation without compromising quality or downstream assay performance.