Paper Sensor to detect Milk FRESHNESS - Background context
Milk is the most widely preferred food in India and also around the world. Unfortunately, the shelf life of milk is very short, which makes it highly perishable and susceptible to contamination and enzyme, microbes development within a short period of time. However, there exist several techniques to preserve it using freezing, and preservatives but those techniques are used so as to transport milk at a considerable location within a short period of time and prevent spoilage during transportation and storage.
Resident scientists and researchers at IIT Guwahati, Assam, India devised a small paper kit that enables smartphones to check the freshness of the Milk and identify how well it has been pasteurized. Coupled with the smartphone app, the kit can help understand how well is the milk to be consumed before it turns too sour for consumption.
The New Sensor Method Developed by the IIT Guwahati, Assam, India
- The primary indicator is the presence of “Alkaline Phosphatase (ALP)” in milk which determines the quality of Milk. Certain times, they get passed through the pasteurization process. Thus the detection of the “Alkaline Phosphatase” in pasteurized milk will help know the quality of the milk.
- The solution devised or developed works in the following fashion, the small piece of paper (similar to litmus paper) is geared/loaded with the chemical/antibodies that react with ALP, the antibodies bind with ALP and thus change the color of the small piece of paper (from white to colored).
- The piece of paper then (with changed color), is photographed and loaded to the smartphone app to know the values and entities associated. The smartphone app then compares, the photo with the app database, and the relevant match is forwarded as a result to the end-user/smartphone user.