Rose bengal

Rose Bengal is a dye that is used in medical and biological applications. It is a derivative of fluorescein, and is named for the bright pink color it imparts.

History

Rose Bengal was first prepared in 1882 by the German chemist Adolf von Baeyer, who was awarded the Nobel Prize in Chemistry in 1905 for his work on dyes and aromatic compounds. The dye was originally used in the textile industry, but its applications have since expanded to include medical and biological research.

Chemical Properties

Rose Bengal is a halogenated derivative of fluorescein. Its chemical formula is C20H2I4O5, and it has a molecular weight of 576.87 g/mol. The dye is a bright pink color and is soluble in water, ethanol, and acetone. It has a maximum absorption wavelength of 549 nm.

Medical Applications

In medicine, Rose Bengal is used in the Rose Bengal test, a diagnostic test for dry eye syndrome. The dye is applied to the eye, and if the eye is dry, the dye will stick to the cornea, indicating a positive result. Rose Bengal is also used in the diagnosis of corneal ulcers and herpes simplex virus infections of the eye.

In addition to its use in ophthalmology, Rose Bengal is used in the treatment of certain types of cancer. The dye is used in Photodynamic therapy, a treatment that uses light to activate a photosensitizing agent, in this case Rose Bengal, which then kills cancer cells.

Biological Applications

In biology, Rose Bengal is used as a stain to identify dead or damaged cells. The dye is taken up by these cells, making them easy to identify under a microscope. Rose Bengal is also used in the study of photosynthesis, as it can inhibit the process in certain organisms.

Safety

While Rose Bengal is generally considered safe for use in humans, it can cause side effects such as eye irritation or allergic reactions in some individuals. It is recommended that the dye be used with caution in individuals with known allergies to iodine.

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Rose Bengal Skeletal
Bengal Rose
Spinoloricus
Rose Bengal Sodium Salt Structure
Rose Bengal Experiment Before
Rose Bengal Experiment

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