Tailin Biotech CDR-01 Enzyme-Substrate Reagent for Total Coliform, Fecal Coliform, and *Escherichia coli* Quantification

Overview

The Tailin Biotech CDR-01 Enzyme-Substrate Reagent is a standardized, ready-to-use microbiological detection system engineered for the quantitative enumeration of total coliforms, fecal (thermotolerant) coliforms, and *Escherichia coli* in water samples. It operates on the principle of enzyme-substrate chromogenic/fluorogenic detection—specifically targeting β-galactosidase (for total coliforms) and β-glucuronidase (for *E. coli*)—enabling rapid enzymatic cleavage of proprietary substrates to yield measurable colorimetric or fluorescent signals. Integrated with automated or semi-automated quantitative membrane filtration or defined substrate technology (DST) workflows—including programmable sample sealing and Most Probable Number (MPN) algorithm-based data interpretation—the CDR-01 delivers regulatory-compliant, reproducible results within 24–48 hours. Designed for use in municipal drinking water systems, environmental surface waters, wastewater effluents, and recreational water monitoring programs, it aligns with internationally recognized methodological frameworks including ISO 9308-1:2014, EPA Method 1604, and Standard Methods 9223B.

Key Features

• Ready-to-use single-dose format: Each 2.7 g ± 0.5 g sachet is pre-sterilized and calibrated for direct inoculation of 100 mL water samples—eliminating culture media preparation, glassware sterilization, and volumetric dilution steps.
• High-selectivity enzymatic detection: Dual-substrate formulation minimizes cross-reactivity with non-target heterotrophic bacteria; validated to suppress interference from >2 × 10⁶ CFU/100 mL background heterotrophs.
• Rapid workflow integration: Manual handling time < 60 seconds per sample; compatible with standard incubators (35 ± 0.5 °C for total/fecal coliforms; 44.5 ± 0.2 °C for *E. coli*).
• Flexible operational environment: Validated for use under both aseptic laminar flow hoods and controlled non-sterile laboratory settings without compromising assay integrity or MPN accuracy.
• Defined shelf life and stability: 12-month expiry when stored at 2–8 °C; lyophilized reagent matrix ensures batch-to-batch consistency and thermal resilience during routine transport and storage.

Sample Compatibility & Compliance

The CDR-01 reagent demonstrates robust performance across diverse water matrices, including chlorinated and unchlorinated potable water, groundwater, river and lake surface water, treated wastewater, and swimming pool water. It meets the sensitivity requirement of 1 MPN/100 mL for all three target organisms—fully satisfying WHO Guidelines for Drinking-water Quality and U.S. EPA Safe Drinking Water Act (SDWA) microbial monitoring thresholds. All reagent lots undergo end-product sterility testing per ISO 11737-2 and are accompanied by Certificate of Analysis (CoA) documenting lot-specific performance verification against ATCC reference strains (*E. coli* ATCC 11775, *Klebsiella pneumoniae* ATCC 13883). The assay design supports GLP-compliant documentation and is compatible with FDA 21 CFR Part 11–enabled LIMS integration when paired with validated digital reader platforms.

Software & Data Management

While the CDR-01 itself is a consumable reagent, its quantitative output is interpreted via standardized MPN lookup tables (provided in printed and PDF formats) or integrated into third-party water quality data management software. Tailin Biotech provides downloadable Excel-based MPN calculators with embedded confidence interval estimation (95% CI), aligned with ASTM D5465–22 statistical guidelines. For laboratories implementing electronic recordkeeping, the reagent’s lot-specific traceability (batch number, manufacturing date, expiry) enables full audit trail linkage within LIMS environments supporting ISO/IEC 17025:2017 Clause 7.11 requirements.

Applications

• Routine compliance monitoring of public drinking water supplies per national regulatory mandates (e.g., China’s GB 5749–2022, U.S. EPA Total Coliform Rule).
• Source water vulnerability assessment and watershed microbial load profiling.
• Validation of point-of-use (POU) and point-of-entry (POE) disinfection systems.
• Environmental impact studies for industrial discharge permits and NPDES reporting.
• Emergency response testing following flood events or infrastructure failures.

FAQ

What is the minimum detection level for *E. coli* using CDR-01?
The validated limit of detection is 1 MPN per 100 mL water sample, consistent with EPA Method 1604 and ISO 9308-1 performance criteria.
Can CDR-01 be used for seawater or high-salinity samples?
Performance has not been validated for salinities exceeding 5 ppt; users should conduct matrix-specific validation per ISO/IEC 17025:2017 Clause 7.2.2 prior to deployment in brackish or marine environments.
Is the reagent compatible with automated colony counters or fluorescence readers?
Yes—CDR-01 generates detectable chromogenic endpoints suitable for manual visual reading or quantification via optical density (OD₆₀₀) or fluorescence intensity (Ex/Em: 365/450 nm) using calibrated plate readers.
Does the kit include incubation equipment or consumables beyond the reagent sachets?
No—the CDR-01 is supplied as a standalone reagent; users must provide standard microbiological incubators, sterile sample bottles, and appropriate filtration apparatus or multi-well trays per their established DST protocol.
How is result interpretation performed without specialized software?
Each kit includes a printed MPN table and step-by-step procedural guide; digital MPN calculators are available for download from Tailin Biotech’s technical support portal.