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New foreign metal oxide sensor can quickly detect the content of formaldehyde in alcohol
[ Instrument R&D of Instrumentation Network ] On June 15, the British "Nature·Food" magazine published a new technology: a team of Swiss scientists reported a palm-sized portable device that can be used in conjunction with a smartphone application to continuously 1. Accurately test the level of methanol in alcoholic beverages to effectively avoid fatal methanol poisoning. It is understood that the handheld device is based on a new metal oxide sensor that can quickly detect adulterated or contaminated alcoholic beverages.
Portable device and built-in metal oxide sensor, pictured from a related paper in the journal Nature & Food
We know that alcoholic beverages are sometimes intentionally doped with cheap methanol in order to increase profits and the stiffness of the beverage. In addition, improper brewing or distillation may also cause methanol to accumulate in alcoholic beverages. Methanol is highly toxic. Methanol poisoning is characterized by central nervous system damage, eye damage, and metabolic acidosis, which is extremely harmful to humans. The survey data shows that from 2017 to 2019, there were 306 recorded cases of methanol poisoning, affecting about 7104 people, resulting in 1888 deaths, and 90% of methanol poisoning occurred in Asia.
Currently, the gold standard for methanol detection is liquid chromatography—separating and measuring different types of chemicals in a mixture. However, although this traditional method has the advantages of sensitivity, good selectivity and simultaneous determination of multiple components, it is time-consuming and expensive.
This time, scientists Andris Gantner, Sotiris Platt Neuss and their colleagues at the Swiss Federal Institute of Technology in Zurich have developed a handheld analyzer that is inexpensive and compatible with smartphones. Quickly detect methanol and ethanol.
The device is based on a metal oxide sensor previously designed by the team. After being placed above an open container, the sensor can absorb gas samples of wine. Since methanol and ethanol are processed at different speeds, they can be tested sequentially. Afterwards, the application will display the methanol and ethanol levels and indicate whether the methanol has reached a potentially harmful level.
It is understood that the metal oxide sensor used by the team is made of palladium-doped tin oxide nanoparticles and is placed in a white shell. Because of its small number of atoms, methanol will pass through the polymer tube faster than ethanol, so that the separation of methanol and ethanol can be achieved in the polymer tube.
To test the accuracy of the device, the researchers tested 89 alcoholic beverages with known methanol levels and found that the device can accurately detect methanol for 107 consecutive days.
Researchers say that the advent of this new system based on metal oxide sensors allows consumers, breweries, law enforcement and health workers to easily check whether alcoholic beverages contain toxic amounts of methanol, helping to avoid lethal methanol Poisoning.
(Original title: New foreign metal oxide sensors can quickly detect formaldehyde content in alcohol)