Anaerobic Indicator Strips (10 per bag)

Updated: 2026-07-15

Overview

Anaerobic indicator strips are specialized tools used to confirm the absence of oxygen in sealed environments, such as anaerobic jars or chambers. Each strip contains a chemical reagent that changes color when exposed to even trace amounts of oxygen, providing a visual confirmation of anaerobic conditions. These strips are typically sold in bags of 10, making them convenient for laboratory use. These indicators are critical in microbiology and clinical laboratories where anaerobic bacteria cultures require oxygen-free environments for accurate growth and study. The strips are designed to be highly sensitive, often detecting oxygen levels as low as 0.1%, ensuring reliable results for sensitive applications.

Physical and Chemical Properties

Anaerobic indicator strips are usually made from absorbent paper or plastic impregnated with a redox-sensitive dye, such as methylene blue or resazurin. The dye is reduced (colorless) under anaerobic conditions and oxidizes (colored) in the presence of oxygen. The color change is reversible, allowing some strips to be reused if re-reduced properly. The strips are lightweight, compact, and designed to fit inside standard anaerobic jars or chambers. They are insoluble in water and stable under typical storage conditions. The exact composition of the reagent may vary by manufacturer, but all strips are formulated to react specifically with oxygen, ensuring high specificity and reliability.

Main Applications

Anaerobic indicator strips are primarily used in microbiology laboratories to verify anaerobic conditions for culturing obligate anaerobic bacteria, which cannot survive in the presence of oxygen. They are also employed in clinical diagnostics, pharmaceutical testing, and food microbiology to ensure the integrity of anaerobic environments. In addition to laboratory use, these strips are utilized in industrial settings where oxygen-sensitive processes or products require monitoring. For example, they may be used in packaging applications to confirm the absence of oxygen in modified atmosphere packaging (MAP) for food preservation.

Safety and Storage

Anaerobic indicator strips are generally non-toxic and safe to handle, but it is recommended to use clean gloves to avoid contamination of the reagent. The strips should be stored in a cool, dry place, away from direct sunlight and moisture, to maintain their sensitivity and shelf life. Exposure to high temperatures or humidity can degrade the reagent, leading to false readings. Manufacturers typically provide a shelf life of 1-2 years when stored under optimal conditions. Used strips should be disposed of according to local laboratory waste disposal regulations.

B2B Procurement Guide

When procuring anaerobic indicator strips in bulk, consider the sensitivity range, shelf life, and compatibility with your anaerobic system. Strips with a sensitivity of 0.1% O₂ are commonly preferred for most applications. Verify the manufacturer's specifications for accuracy and reliability. Prices vary based on quantity and supplier, with bulk purchases often offering cost savings. Leading suppliers include Thermo Fisher Scientific, Merck, and BD Biosciences. Ensure the strips are certified for use in your specific application, and check for batch-to-batch consistency to maintain reliable results.