HiPure Pathogen RNA/DNA Kit
Enriched Pathogen RNA/DNA Workflow for Low-Cell-Content Biological Samples
Key fraction logic
The viral fraction is retained in the transferred supernatant, while the pellet or remaining material proceeds through microbial enrichment, host-background reduction, DNase treatment and bead-tube disruption. This module ends when the retained viral supernatant is combined with the microbial homogenate; ACL / Proteinase K lysis then starts the shared silica column method.
How to read this note
1. Workflow structure
This workflow separates sample-specific pretreatment from the shared pathogen enrichment module and the downstream silica column purification path. It is intended as a practical companion to the product manual rather than a replacement for the official protocol. The downstream steps follow a silica membrane spin-column purification workflow. A simplified direct total nucleic acid extraction route is also available for 0.5 ml samples when separate microbial enrichment or retained-supernatant handling is not required; this note focuses on Protocol 1 because it better represents the sample-specific pathogen enrichment workflow.
2. Time interpretation
Protocol times stated in the product manual are retained where applicable. Steps without explicit timing are estimated for an experienced operator, including pipetting, tube transfer, centrifuge or magnetic-rack handling, supernatant / filtrate removal and tube or column repositioning. For short protocol ranges, the timeline uses the midpoint. For long or optional protocol ranges, the displayed standard timeline uses the shortest reasonable path, while the note and total-time range indicate where extended handling may apply. Cumulative time runs continuously from the first step to final elution across all workflow sections. Downstream column steps include handling time for repeated loading, buffer addition, filtrate disposal and column repositioning.
3. Workflow characteristics
IVD4179 uses a fraction-retention strategy rather than a simple direct lysis route. The transferred supernatant is retained as the viral fraction, while the pellet or remaining material proceeds through microbial enrichment, host-background reduction, DNase treatment and bead-tube microbial disruption. The retained viral supernatant is then combined with the microbial homogenate as the final step of the enrichment module; ACL / Proteinase K lysis marks the start of the shared silica column method.
4. Practical considerations
The key handling point is clean separation and retention of the liquid fraction before the pellet enters the microbial enrichment route. The retained supernatant should not be discarded, and the pellet should be fully resuspended before DNase treatment and bead-tube disruption. For sputum, adequate mucus dissolution upstream is usually more important than modifying the downstream column wash steps.