New Non-Invasive Formaldehyde Sensor for Room-Temperature Detection of Adulterated Fish

Source– This post is based on the article “New non-invasive formaldehyde sensor can detect adulterated fish at room temperature” published in “PIB” on 27th December 2023.

Why in the News?

Researchers have developed a new cost-effective formalin sensor that can effectively detect the presence of formalin (solution of formaldehyde in water) in adulterated fishes.

What is Formaldehyde?

1) Formaldehyde is a colourless, pungent gas that is used in a variety of industrial processes, including as a preservative in some foods, commonly in fish in developing countries.

2) However its use in food is banned in many countries due to its carcinogenic nature.

What are the Present Techniques for Detecting Formalin Adulteration in Fish?

1) Commercial formalin sensors for fish mainly rely on either electrochemical or colorimetric principles.

2) Electrochemical sensors, while widely employed, tend to be costly. Conversely, colorimetric sensors are more budget-friendly.

3) However, both approaches are invasive, and they face challenges in achieving precise and selective detection, particularly at low levels.

What is this New Non-Invasive Formaldehyde Sensor?

1) The formalin sensor has been developed using tin oxide-reduced graphene oxide composite (rGO-SnO2) that can effectively detect the presence of formalin in adulterated fishes

2) Reduced graphene oxide (rGO) is employed for detecting toxic gases, while tin oxide (SnO2) is extensively studied for its ability to detect formaldehyde.

3) Advantages-
a. The technique involves non invasive detection of formalin.
b. The sensor exhibits prolonged stability and a low level detection limit.
c. Its relatively cost effective.
d. Regarded as a breakthrough in the field of food adulteration.

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