Edible sensor to control the freezing of food. Free Technical Library News

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Edible sensor for food freezing control

23.10.2022

The new development of scientists will help sellers and buyers find out how many times the product has been defrosted and frozen.

When we buy products, it is not always possible to say how strictly the conditions for their storage and transportation were observed. It is possible that they were repeatedly frozen before being sold, and this has a big impact not only on the texture, but also on the taste.

Therefore, the sensor will soon be actively used, it will show the number of defrosts and freezes. The sensor is safe as it is made from edible materials such as table salt, red cabbage and beeswax.

The device changes color when heated above a predetermined temperature from minus 50 to zero degrees.

It is a galvanic nest filled with an electrolyte solution. This role can be played, for example, by a solution of table salt, grape or apple juice and other edible liquids saturated with salts.

Depending on their set, the temperature sensitivity of the system changes. This nest is connected to another, ionochromic, containing red cabbage juice. To do this, use the thinnest tin and gold electrodes. And the nests themselves, and the whole system in general, are placed in beeswax.

The researchers have already demonstrated the operation of the device in the form of several prototypes in the laboratory. Experiments have confirmed that when the electrolyte solution is defrosted, a weak current appears in the first socket, which enters the second, changing the color of the red juice to blue.

In the future, such sensors will allow employees of retail chains to monitor compliance with food storage conditions, and customers to make sure that they are buying a quality product.

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Random news from the Archive

Lies change the brain 29.10.2016

Once having lied, then we lie more and more simply - for sure, many people know this from their own experience. As the experiments of researchers from University College London have shown, the reasons for this psychological effect lie in a region of the brain called the amygdala, or amygdala - often called the center of fear, but in fact the amygdala is involved in the formation of any emotions.

The man had to mislead his partner as to how many coins were in the glass. Lying was encouraged: if the other was convinced that there were more coins than in reality, the deceiver received a reward. At the same time, the brain activity of the liars was monitored using magnetic resonance imaging. It turned out that with each subsequent deception, the activity of the amygdala decreased, and, curiously, the more the activity of the amygdala fell, the greater was the next lie about coins and a glass.

Obviously, when a person lies for the first time, the amygdala "tenses up" and we feel not entirely pleasant emotions in connection with our own lies. But then something like addiction occurs, the amygdala resigns itself, and we lie without fear of discomfort. However, it is still not possible to completely suppress internal resistance: the experiment provided for the maximum level of lies about the number of coins, but no one reached it.

Note that so far we have been talking about the most unpleasant kind of lies - lies solely in our own interests. When the participants in the experiment were offered to lie in the common interest, that is, when not only the lying person, but also his partner received the benefit, the amygdala reacted less sharply, and the person in this case lied more and more willingly - most likely because the lie received some justification.

It can be assumed that social relations play a big role here: we hear from childhood that it is not good to lie, that we will be punished for lying, and our perfectly trained brain eventually remembers this as a necessary rule of life - although from time to time we have to step over it .

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