Sulphate Reducing Medium (Twin Pack) A1 Quality – HX-Media

Sulphate Reducing Medium (Twin Pack) – HX-Media

Product Overview

Sulphate Reducing Medium (Twin Pack) is a specialized, high-performance culture medium system designed for the selective detection, enrichment, and cultivation of sulphate-reducing bacteria (SRB), a group of strict anaerobic microorganisms responsible for reducing sulphates to sulfides. These bacteria, including genera such as Desulfovibrio, Desulfotomaculum, and Desulfobacter, are widely encountered in industrial water systems, oil reservoirs, marine environments, and soil ecosystems.

The twin pack configuration consists of two separate components—typically a basal nutrient medium and a reducing/indicator supplement—which are combined just prior to use. This format ensures improved stability of sensitive ingredients, particularly reducing agents and iron salts, while also maintaining optimal redox conditions required for SRB growth. It also minimizes degradation during storage and enhances the overall reliability and reproducibility of results.

This medium is specifically formulated to support anaerobic metabolism, providing suitable carbon sources (such as lactate), essential nutrients, sulphate ions, and reducing agents that lower the oxidation-reduction potential of the medium. Once inoculated and incubated under oxygen-free conditions, sulphate-reducing bacteria metabolize sulphates into hydrogen sulfide (H₂S) as part of their energy-generating process.

The generated H₂S reacts with iron salts present in the medium, leading to the formation of black ferrous sulfide (FeS) precipitate, which serves as a clear and visible indicator of SRB activity. The intensity of blackening often correlates with the level of bacterial activity and sulphide production.

This medium is extensively utilized in oil & gas industries for pipeline corrosion monitoring, water and wastewater testing, environmental microbiology, marine studies, and industrial hygiene programs, where early detection of SRB is critical to prevent microbiologically influenced corrosion (MIC) and associated operational failures.

🔬 Key Features

• Highly selective for sulphate-reducing bacteria
• Twin pack system preserves sensitive components and improves shelf life
• Clear visual indication (blackening) for easy interpretation
• Supports growth of strict anaerobic microorganisms
• Suitable for quantitative and qualitative analysis
• Reliable for field testing and laboratory applications
• Helps in early detection of biocorrosion risks

🎯 Applications

• Oil & gas industry: Monitoring SRB in pipelines, reservoirs, and drilling fluids
• Water & wastewater testing: Detection of sulphide-producing bacteria
• Environmental studies: Soil, sediment, and marine microbiology
• Corrosion studies: Assessment of microbiologically influenced corrosion (MIC)
• Industrial systems: Cooling towers, boilers, and storage tanks
• Research laboratories: Study of anaerobic metabolism and sulphur cycle

🧪 Composition (Typical)

• Sodium lactate – 3.5 g

• Sodium sulfate – 4.5 g

• Yeast extract – 1.0 g

• Ascorbic acid – 0.1 g

• Ammonium chloride – 1.0 g

• Magnesium sulfate – 2.0 g

• Calcium chloride – 0.1 g

• Ferrous ammonium sulfate – 0.5 g

• Dipotassium phosphate – 0.5 g

• Agar (optional for solid medium) – 15 g

• Final pH: 7.5 ± 0.2

🛠️ How to Use

1. Prepare the basal medium by dissolving in distilled water
2. Sterilize by autoclaving at 121°C for 15 minutes
3. Cool to at 45–50°C
4. Aseptically add the second component (reducing/indicator supplement)
5. Mix gently to avoid oxygen incorporation
6. Dispense into sterile tubes or bottles (preferably filled to minimize air space)
7. Inoculate sample under strict aseptic and anaerobic conditions
8. Incubate at 30–37°C for 3–7 days (or longer if required)
9. Observe for black precipitate formation, indicating SRB growth

⏳Storage and Shelf Life

• Store both components at 10–30°C in a dry, well-ventilated area
• Protect from moisture, heat, and direct sunlight
• Keep containers tightly sealed
• Reconstituted medium should be used immediately or within a short time
• Shelf life: Typically 2–3 years under recommended conditions

👍 Ideal For

✔ Environmental labs

✔ Oil & gas sector

✔ Industrial water systems

✔ Anaerobic research