A multi-functional reagent suitable for 1-step rapid DNA intercalation fluorescence-based screening of total bacteria in drinking water

Hyun Jeong Lim, Seungwon Hong, Hyowon Jin, Beelee Chua, Ahjeong Son

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The prerequisites for rapid screening of total bacteria in drinking water are low detection limit and convenience. Inspired by commercial adenosine 5′-triphosphate (ATP) based total bacterial detection kits, we pursued likewise convenience but with much lower detection limit. Existing intercalation fluorescence-based techniques employ multiple reagents to permeate the cell membrane and intercalate dye into the DNA in discrete sequential steps. A simple multi-functional reagent is proposed to do the same within one step. Surfactants (TritonX and SDS), and intercalating dyes (SYBR green, SYBR gold) were examined for their mutual compatibility and augmented with EDTA. Evaluation was performed with Gram negative Escherichia coli K12 (E. coli K12) and Gram positive Bacillus subtilis (B. subtilis) at serial dilution ratios from 10−6 to 10−2. Comparison was made with absorbance (600 nm) measurements and a commercial ATP kit. Using charge integrated photodetection, the proposed 1-step reagent achieved an LOD (1.00 × 10−6, B. subtilis) that is two orders of magnitude lower than that of ATP kit (LOD = 1.06× 10−4). This means it could detect minute quantity of total bacteria that is otherwise undetected by the ATP kit.

Original languageEnglish
Article number137541
JournalChemosphere
Volume313
DOIs
StatePublished - Feb 2023

Bibliographical note

Funding Information:
This study was supported by the National Research Foundation of Korea ( NRF-2019R1A2C2084233 and NRF-2022R1F1A1063936 ).

Publisher Copyright:
© 2022 Elsevier Ltd

Keywords

  • Charge integrated photodetection
  • Convenience
  • Intercalated dye fluorescence
  • Low detection limit
  • Multifunctional reagent
  • Total bacteria in drinking water

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