Isolation of pathogenic bacteria from sputum samples using a 3D-printed cartridge system. Issue 41 (30th September 2021)

• Record Type: Journal Article
• Authors: Pahlow, Susanne; Hentschel, Stefanie; Horbert, Peter; Romero, Cynthia; Lehniger, Lydia; Wagner, Sascha; Popp, Jürgen; Weber, Karina
• Is Part Of: Analytical methods. Volume 13:Issue 41(2021)
• Page Start: 4884
• Page End: 4895
• Publication Date: 2021-09-30
• Subjects: Chemistry, Analytic -- Periodicals; Analytical biochemistry -- Periodicals; Chemical laboratories -- Standards -- Periodicals; 543.1905
• DOI: 10.1039/d1ay00924a
• Languages: English
• ISSNs: 1759-9660

Abstract

Abstract : We introduce a 3D-printed cartridge system enabling the convenient and cost-efficient sample preparation from sputum for PCR based detection schemes. Abstract : Within this contribution we introduce a 3D-printed cartridge system enabling the convenient and cost-efficient sample preparation from sputum for subsequent PCR based detection schemes. The developed fluidic system operates on pneumatic actuations. The closed system ensures a very low probability for contamination during sample processing, which is crucial when using a highly sensitive detection method such as PCR. The enrichment of the bacterial cells is achieved using different types of amine-functionalized particles. Our particle-based sample preparation approach yields intact and viable bacterial cells. Accordingly, not only PCR-based detection schemes can be employed, but also spectroscopic methods and biochemical tests, which require cultivation steps, are possible. The cartridge design in principle is compatible with magnetic and non-magnetic particle types. We investigated both variants and found that the performance of expanded glass beads is superior over the magnetic particles within the cartridge. Owing to the rather large size of the expanded glass beads, the dimensions of the channels can be enlarged, leading to lower hydrodynamic resistances, which is beneficial when processing viscous samples such as sputum. We verified the performance of our system using both artificial and real sputum samples containing Escherichia coli and Moraxella catarrhalis .