Simplified Purification of Fecal Pathogens DNA/RNA Using AffiPURE Kit: A Technical Overview

Fecal pathogens are a significant concern in clinical diagnostics, public health, and environmental monitoring. Accurate detection and quantification of these pathogens are essential for disease management and prevention. The AffiPURE Fecal Pathogens DNA/RNA Purification Kit is designed to simplify and enhance the extraction and purification of nucleic acids from fecal samples, providing high-quality DNA and RNA suitable for downstream applications such as PCR, RT-PCR, and sequencing.

Materials and Methods

The AffiPURE kit includes several components designed for efficient extraction and purification:

  • Lysis Buffer: A proprietary buffer that ensures effective lysis of fecal matter, releasing nucleic acids while minimizing the degradation of RNA.
  • Binding Buffer: Facilitates the binding of nucleic acids to the purification column.
  • Wash Buffers: Remove impurities and potential inhibitors from the bound nucleic acids.
  • Elution Buffer: Elutes the purified DNA/RNA from the column for subsequent analysis.

Sample Preparation

  • Sample Collection: Collect approximately 200 mg of fecal sample in a sterile container.
  • Homogenization: Homogenize the sample in the lysis buffer to ensure complete lysis of pathogens and fecal matter.

Nucleic Acid Extraction

  1. Lysis: Incubate the homogenized sample with the lysis buffer at room temperature for 10 minutes to ensure complete lysis.
  2. Binding: Add the binding buffer to the lysate and transfer the mixture to the purification column.
  3. Washing: Wash the bound nucleic acids with the provided wash buffers to remove contaminants.
  4. Elution: Elute the purified DNA/RNA with the elution buffer.


The AffiPURE kit was evaluated using fecal samples spiked with known quantities of various pathogens, including bacteria (e.g., Salmonella, E. coli), viruses (e.g., Norovirus), and parasites (e.g., Giardia). The purity and concentration of the extracted DNA/RNA were assessed using spectrophotometry and fluorometry.

  1. Yield: The kit consistently provided high yields of DNA/RNA, with average concentrations of 50-100 ng/μL.
  2. Purity: The A260/A280 ratios ranged between 1.8-2.0 for DNA and 2.0-2.2 for RNA, indicating high purity suitable for downstream applications.
  3. Integrity: The integrity of RNA was confirmed by electrophoresis, showing distinct 28S and 18S rRNA bands without significant degradation.


The AffiPURE Fecal Pathogens DNA/RNA Purification Kit demonstrates robust performance in extracting high-quality nucleic acids from fecal samples. The streamlined protocol minimizes hands-on time and reduces the risk of contamination. The high yield and purity of the extracted nucleic acids make the kit suitable for various molecular biology applications, including pathogen detection, genetic studies, and epidemiological surveys.

In conslusion ,the AffiPURE kit is an effective and reliable solution for the purification of DNA and RNA from fecal samples. Its use can significantly enhance the accuracy and efficiency of diagnostic and research efforts involving fecal pathogens. The simplicity and efficiency of the protocol make it an excellent choice for both routine and high-throughput laboratory settings.

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