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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...

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Updated: Sep 10, 2025

Laboratory Protocol for Genetic Gut Content Analyses of Aquatic Macroinvertebrates Using Group-specific rDNA Primers

Laboratory Protocol for Genetic Gut Content Analyses of Aquatic Macroinvertebrates Using Group-specific rDNA Primers

Published on: October 5, 2017

Comparison between different protocols for DNA extraction for Hypostomus affinis.

M Rodrigues-Zeferino¹, S Oliveira-Olimpio², P C Costa-Pierro²

¹Instituto Capixaba de Pesquisa, Assistência Técnica e Extensão Rural - INCAPER, Vitória, ES, Brasil.

Brazilian Journal of Biology = Revista Brasleira De Biologia

|August 20, 2025

Summary

This summary is machine-generated.

Researchers compared DNA extraction methods for the sand catfish (Hypostomus affinis). Protocol I yielded the highest DNA concentration and purity, making it the optimal choice for molecular studies of this species.

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Area of Science:

Ichthyology
Molecular Biology
Genetics

Background:

The sand catfish (Hypostomus affinis), native to Brazil, possesses unique physical traits like a flattened body and spiky fins.
Molecular studies are crucial for understanding fish species, including Hypostomus affinis.

Purpose of the Study:

To compare different DNA extraction methodologies.
To determine the most effective DNA extraction protocol for Hypostomus affinis.

Main Methods:

DNA was extracted from the caudal fin of twenty adult Hypostomus affinis specimens using three distinct protocols.
DNA concentration (ng/µL) and purity (A260/280 and 230/260 ratios) were quantified using a NanoDrop 2000c Spectrophotometer.

Main Results:

Protocol I, based on Barrero, resulted in the highest DNA concentration (2846.28 ng/µL).
Protocol III (NaCl) showed comparable DNA concentration (2385.69 ng/µL).
Protocol I demonstrated superior DNA quantity and purity compared to other tested methods.

Conclusions:

Protocol I is the most effective method for DNA extraction in Hypostomus affinis.
This optimized protocol will facilitate future molecular research on the sand catfish.