Stickers and a smartphone for simple detection of nitrites in meals

Stickers and a smartphone for simple detection of nitrites in meals
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Calcomanías y un teléfono inteligente para una fácil detección de nitritos en los alimentos

A brand new movie reacts to nitrite anions by means of a coloration change, darkening with greater ranges of nitrite. Credit score: Tailored from ACS Utilized Supplies and Interfaces 2022, DOI: 10.1021/acsami.2c09467

Nitrates and nitrites give processed meats their attribute pink coloration and robust taste. Though many shoppers need to restrict their consumption of those preservatives as a result of the substances can type probably carcinogenic compounds, understanding how a lot is in a meals has been tough to find out. Now, researchers reporting in ACS Utilized Supplies and Interfaces have developed a color-changing movie that buyers can stick on meals and simply take a look at for nitrite ranges by taking a photograph with a smartphone.

Cured and processed meats, akin to salami and bacon, are sometimes handled with nitrite or nitrate salts to keep up their recent look and taste. Though nitrate is comparatively steady, it may turn into probably the most reactive nitrite ion within the physique. When within the acidic surroundings of the abdomen or below the excessive warmth of a frying pan, nitrite can react to type nitrosamines, which have been linked to the event of a number of varieties of most cancers. Some strategies for figuring out nitrite ranges in meals exist already, however they don’t seem to be very simple to make use of and infrequently require costly and labor-intensive strategies and devices. To assist shoppers make extra knowledgeable selections, Saúl Vallejos, José M. García and their colleagues needed to develop an easy-to-use nitrite quantification system.

To perform this, the researchers developed a movie they known as “POLYSEN,” which stands for “polymeric sensor,” produced from 4 monomers and hydrochloric acid. Perforated discs of the fabric had been positioned in meat samples for quarter-hour, permitting the movie acid and monomer items to react with the nitrite in a four-step azo coupling response. The disks had been then eliminated and immersed in sodium hydroxide resolution for one minute to develop coloration. When nitrite was current, the yellowish hue of the movie grew to become deeper with greater ranges of nitrite within the meals. To quantify the colour change, the researchers created a smartphone app that self-calibrates when a graph of reference disks is photographed in the identical picture because the pattern disks.

The crew examined the movie on meats that had been ready and handled with nitrite, in addition to store-bought meats, and located that the POLYSEN-based technique produced outcomes much like these obtained with a extra advanced, conventional nitrite detection technique. As well as, POLYSEN complied with European laws for the migration of drugs from the movie to the meals. The researchers say the brand new strategy may very well be an easy-to-use and cheap method for shoppers to find out nitrite ranges in meals.

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Extra info:
“Simple Processed Meat Nitrite Evaluation with Colorimetric Polymer Sensors and a Smartphone App” ACS Utilized Supplies and Interfaces (2022).

Offered by the American Chemical Society

Quotation: Stickers and a smartphone for simple detection of nitrites in meals (Aug 3, 2022) Retrieved Aug 3, 2022 at nitrite-foods.html

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