Why is it in the news?

• Researchers have developed a new, cost-effective formalin sensor designed to detect the presence of formaldehyde in adulterated fish.

Present Techniques for Detection

• Commercial formalin sensors for fish traditionally rely on either electrochemical or colorimetric principles.
• Electrochemical sensors are effective but often expensive, while colorimetric sensors are more budget-friendly.
• Both methods are invasive and face challenges in achieving precise and selective detection, especially at low levels.

Characteristics of the New Non-Invasive Formaldehyde Sensor

• Developed using tin oxide-reduced graphene oxide composite (rGO-SnO2).
• Reduced graphene oxide (rGO) is known for detecting toxic gases, while tin oxide (SnO2) is recognized for its ability to detect formaldehyde.

Advantages:

• The sensor employs a non-invasive technique for detecting formalin in adulterated fish.
• Exhibits prolonged stability, ensuring consistent performance.
• Has a low-level detection limit, enabling the identification of formaldehyde even at low concentrations.
• The development is relatively cost-effective, making it a practical solution for widespread use.
• Regarded as a breakthrough in the field of food adulteration, addressing issues associated with traditional detection methods.