Rapid and inexpensive method of PCR ready DNA isolation from human peripheral blood and saliva

Background: The isolation of nucleic acids is a frequently performed procedure in the molecular biology area. Although several rapid DNA isolation techniques from human peripheral blood and saliva have been developed, there are still some disadvantages - volume, time, cost, and yield are a few notable ones. Objective: We aim to develop a rapid and inexpensive method to isolate high-molecular-weight genomic DNA from human peripheral blood and saliva that can be used for molecular biology experiments. Methods: Five DNA isolation methods with slightly varying protocols were used. High-quality DNA obtained from one specific method was further amplified by PCR and the template with good amplification was further used for performing RFLP and sequencing. Results: Out of 5 different isolation methods (R1 to R5), DNA obtained from the R4 was of good quality (molecular weight is > 10 kb and 260/280 ratio is 1.89 +/- 0.2), which allows successful PCR amplification and good separation in Restriction Fragment Length Polymorphism analysis. Sequencing by the Sanger Sequencing produced a good readable sequence of an amplified fragment from Method R4 DNA. Conclusion: In the present study we have developed a simple, rapid, and cost-effective DNA isolation method, which uses low sample volume and yields good quantity and high-quality product. The DNA obtained is highly fit for molecular genetics research applications.