Question:medium

Which of the following is a non-leucoform dye used in the rapid test utilizing starter cultures for the detection of antibiotic residues in milk?

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To distinguish dye types in microbial assays:
- Leucoform = Colored (Oxidized) $\rightarrow$ Colorless (Reduced) (e.g., Methylene Blue, Resazurin).
- Non-leucoform = Colorless (Oxidized) $\rightarrow$ Deeply Colored (Reduced) (e.g., Tetrazolium $\rightarrow$ Red Formazan).
Updated On: Jul 21, 2026
  • Methylene blue
  • Resazurin
  • Tetrazolium
  • Nigrosine
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The Correct Option is C

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