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Viscoelastic Separation and Concentration of Fungi from Blood for Highly Sensitive Molecular Diagnostics.

ABSTRACT: Isolation and concentration of fungi in the blood improves sensitivity of the polymerase chain reaction (PCR) method to detect fungi in blood. This study demonstrates a sheathless, continuous separation and concentration method of candida cells using a viscoelastic fluid that enables rapid detection of rare candida cells by PCR analysis. To validate device performance using a viscoelastic fluid, flow characteristics of 2??m particles were estimated at different flow rates. Additionally, a mixture of 2??m and 13??m particles was successfully separated based on size difference at 100??l/min. Candida cells were successfully separated from the white blood cells (WBCs) with a separation efficiency of 99.1% and concentrated approximately 9.9-fold at the center outlet compared to the initial concentration (~2.5?×?107?cells/ml). Sequential 1st and 2nd concentration processes were used to increase the final number of candida cells to ~2.3?×?109 cells/ml, which was concentrated ~92-fold. Finally, despite the undetectable initial concentration of 101?CFU/ml, removal of WBCs and the additional buffer solution enabled the quantitative reverse transcription (RT)-PCR detection of candida cells after the 1st concentration (Ct?=?31.43) and the 2nd concentration process (Ct?=?29.30).

SUBMITTER: Nam J

PROVIDER: S-EPMC6395622 | biostudies-literature |

REPOSITORIES: biostudies-literature

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