Which chemical reaction is used on urine dipsticks to detect nitrites?

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Multiple Choice

Which chemical reaction is used on urine dipsticks to detect nitrites?

The test on urine dipsticks detects nitrites using a diazonium reaction, a form of the Griess reaction. In urine, bacteria that cause infection often reduce nitrates to nitrites. The nitrite then reacts with an aromatic amine to form a diazonium ion, which quickly couples with another aromatic compound to yield a colored azo dye. This color change on the dipstick signals a positive nitrite result. The key idea is that a diazonium-based coupling produces the visible color for nitrite detection. Ninhydrin targets amino acids, Benedict’s test looks for reducing sugars, and the azodye colorimetric approach is a broader method not specific to nitrite detection, so they don’t explain the dipstick result as directly as the diazonium reaction.

The test on urine dipsticks detects nitrites using a diazonium reaction, a form of the Griess reaction. In urine, bacteria that cause infection often reduce nitrates to nitrites. The nitrite then reacts with an aromatic amine to form a diazonium ion, which quickly couples with another aromatic compound to yield a colored azo dye. This color change on the dipstick signals a positive nitrite result. The key idea is that a diazonium-based coupling produces the visible color for nitrite detection. Ninhydrin targets amino acids, Benedict’s test looks for reducing sugars, and the azodye colorimetric approach is a broader method not specific to nitrite detection, so they don’t explain the dipstick result as directly as the diazonium reaction.

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