|Molar mass||973.67 g/mol
1,017.65 g/mol (sodium salt)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is: / ?)(|
Rose bengal (4,5,6,7-tetrachloro-2',4',5',7'-tetraiodofluorescein) is a stain. Its sodium salt is commonly used in eye drops to stain damaged conjunctival and corneal cells and thereby identify damage to the eye. The stain is also used in the preparation of Foraminifera for microscopic analysis, allowing the distinction between forms that were alive or dead at the time of collection.
A form of Rose Bengal is also being studied as a treatment for certain cancers and skin conditions. The cancer formulation of the drug, known as PV-10, is currently undergoing clinical trials for melanoma and breast cancer. The company also has formulated a drug based on Rose Bengal for the treatment of eczema and psoriasis; this drug, PH-10, is currently in clinical trials as well.
Rose Bengal is also used in synthetic chemistry to generate singlet oxygen from triplet oxygen. The singlet oxygen can then undergo a variety of useful reactions, particularly [2 + 2] cycloadditions with alkenes and similar systems.
Rose Bengal can be used to form many derivatives that have important medical functions. One such derivative was created so to be sonosensitive but photoinsensitive, so that with a high intensity focused ultrasound, it could be used in the treatment of cancer. The derivative was formed by amidation of Rose Bengal, which turned off the fluorescent and photosensitive properties of Rose Bengal, leading to a usable compound, named in the study as RB2.
Salts of Rose Bengal can also be formed, with the molecular formula C20 H4 Cl4 I4 O5 . 2 Na, molecular weight of 1017.64 g/mol and CAS # 632-69-9. Known as Rose Bengal Sodium Salt, this compound has its own unique uses and properties, but also functions as a dye.
PV-10 was found to cause an observable response in 60 percent of tumors treated, according to researchers in a phase II melanoma study. Locoregional disease control was observed in 75 percent of patients. Also confirmed was a "bystander effect", previously observed in the phase I trial, whereby untreated lesions responded to treatment as well, potentially due to immune system response. These data were based on the interim results of the first 40 patients treated in an 80 patient study. Rose Bengal has been shown to not just prevent the growth and spread of ovarian cancer, but also to cause apoptotic cell death of the cancer cells. This has been proven in vitro, in order to prove that Rose Bengal is still a possible option in the treatment of cancer, and further research should be done.
Rose Bengal is also used in animal models of ischemic stroke (photothrombotic stroke models) in biomedical research. A bolus of the compound is injected into the venous system. Then the region of interest (e.g., the cerebral cortex) is exposed and illuminated by LASER light of 561 nm. A thrombus is formed in the illuminated blood vessels, causing a stroke in the dependent brain tissue.
Rose Bengal is able to stain cells whenever the surface epithelium is not being properly protected by the preocular tear film, because Rose Bengal has been proven to not be able to stain cells because of the protective functioning of these preocular tear films. This is why Rose Bengal is often useful as a stain in diagnosing certain medical issues, such as conjunctival and lid disorders.
Rose Bengal is being researched as an agent in creating nano sutures. Wounds are painted on both sides with it and then illuminated with an intense light. This links the tiny collagen fibers together sealing the wound. Healing is faster and the seal reduces chances of infection.
Rose Bengal is used in several microbiological media, including Cooke's Rose Bengal agar, to suppress bacterial growth.
Rose Bengal demonstrates at least six distinct electronic properties which are otherwise hidden in the molecule. Rose Bengal is a double planar molecule and relative rotation of the planes generate unique electronics. Therefore, Rose Bengal is a suitable candidate for molecular electronics.
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- Laser Show in the Surgical Suite, Technology Review, March/April 2009
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- A new approach to extract multiple distinct conformers and co-existing distinct electronic properties of a single molecule by point-contact method Anirban Bandyopadhyay, Satyajit Sahu, Daisuke Fujita and Yutaka Wakayama, Phys. Chem. Chem. Phys., 2010 view highlights in Royal Society of Chemistry,
- Alexander, Walter (2010). "American Society of Clinical Oncology, 2010 Annual Meeting and Rose Bengal: From a Wool Dye to a Cancer Therapy". Pharmacy and Therapeutics 35 (8): 469–474. PMC 2935646. PMID 20844697. Retrieved 5 November 2013.
- Rose Bengal at the US National Library of Medicine Medical Subject Headings (MeSH)
- Absorption and extinction data