The isolation of bio-molecules such as proteins and nucleic acids is a necessary step for both diagnostic and analytical processes in the broad fields of research and clinical applications. Although a myriad of isolation technologies have been developed, a method for simultaneous protein and nucleic acid isolation has not been explored for clinical use. Obtaining samples from certain cancers or rare diseases can be difficult. In addition, the heterogeneity of cancer tissues typically leads to inconsistent results when analyzing biomolecules. We here describe a homobifunctional imidoester (HI)-based microfluidic system for simultaneous DNA and protein isolation from either a solid or liquid single biopsy sample. An efficient and cost effective microfluidic design with less air bubbles was identified among several candidates using simulation and experimental results from the streamlining of isolation processing. HI groups were used as capture reagents for the simultaneous isolation of bio-molecules from a single specimen in a single microfluidic system. The clinical utility of this system for the simultaneous isolation of DNA and proteins within 40 min was validated in cancer cell lines and 23 tissue biopsies from colorectal cancer patients. The quantity of isolated protein and DNA was high using this system compared to the spin-column method. This HI-based microfluidic system shows good rapidity, affordability, and portability in the isolation of bio-molecules from limited samples for subsequent clinical analysis.
Bibliographical noteFunding Information:
This study was supported by a grant from the Korea Health Technology R & D Project through the Korea Health Industry Development Institute (KHIDI), funded by the Ministry of Health & Welfare, Republic of Korea (HI16C-0272-010016), and also supported by the Ministry of Science, ICT, and Future Planning (MSIP) through the National Research Foundation of Korea (NRF) (2017R1A2B4005288 & 2016R1A6A3A11932575), Republic of Korea, and also supported by the 2018 Research Fund of University of Ulsan College of Medicine, Republic of Korea.
© 2019 The Royal Society of Chemistry.
All Science Journal Classification (ASJC) codes
- Biomedical Engineering