fluoresceine
Học thuậtThân thiện
Definition
- Noun:
- A synthetic organic compound used as a dye and tracer: Fluoresceine is a highly fluorescent, yellow-red crystalline powder. Its primary use is as a dye and an indicator due to its strong fluorescence, especially in alkaline solutions.
- An absorption indicator in analytical chemistry: It is specifically used in analytical chemistry to detect the endpoint of certain titrations, notably the precipitation of silver chloride. The solution turns pink when the reaction is complete.
Examples of Usage
- Noun:
- The laboratory used fluoresceine to trace the flow of groundwater.
- A drop of fluoresceine was added to the eye to check for corneal abrasions.
- In the titration, the appearance of a pink color indicated that the fluoresceine ions were being absorbed.
Advanced Usage
- "Fluoresceine angiography": A medical imaging technique where fluoresceine dye is injected into the bloodstream to photograph the blood vessels in the retina.
- The doctor ordered a fluoresceine angiography to diagnose the retinal condition.
Variants and Related Words
- Fluorescein: The more common and standard spelling for the same compound.
- Fluorescein isothiocyanate (FITC): A derivative of fluorescein commonly used as a fluorescent label in antibody-based tests and microscopy.
- Fluorescence (n): The property of absorbing light of one wavelength and emitting light of a longer wavelength, which is the key characteristic of fluoresceine.
- Fluorescent (adj): Describing a substance that exhibits fluorescence.
Synonyms
- Fluorescein: The direct synonym and alternate spelling.
- Resorcinolphthalein: A systematic chemical name for the compound.
- D&C Yellow No. 7: One of its identifiers when used as a color additive.
- Tracer dye: Describes one of its primary functions.
Related Phrases / Compounds
- Fluoresceine sodium: The water-soluble sodium salt of fluoresceine, often used in medical applications.
- Fluoresceine test: Any diagnostic test utilizing fluoresceine dye, such as checking for leaks in the eye or in plumbing systems.
Noun
- a yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed)