Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-15726
Bernauer, W; Thiel, M A; Rentsch, K M (2008). Phosphate concentration in ophthalmic corticoid preparations. Graefe's Archive for Clinical and Experimental Ophthalmology, 246(7):975-978.
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BACKGROUND: Topical preparations, high in phosphate, may cause calcification when used on a damaged corneal surface. The knowledge of the phosphate concentration in medications helps to prevent corneal calcifications. Our study gives an overview of the amount of phosphate contained in ophthalmic corticoid preparations. METHODS: Samples of 38 commercially available corticoid preparations were tested. The quantification of phosphate was performed using the molybdate method on a Modular P autoanalyzer. RESULTS: 18 of 38 preparations (47%) had a phosphate concentration above physiological levels (>1.45 mmol/l). It varied greatly, and ranged from less than 0.1 mmol/l (18 preparations) to 62.6 mmol/l. The corticoids that were tested included betamethasone sodium phosphate (18.3-35.5 mmol/l), dexamethasone (0.1-17.6 mmol/l), dexamethasone sodium phosphate (<0.1-62.6 mmol/l), fluorometholone (<0.1-22.5 mmol/l), and prednisolone acetate (<0.1-0.5 mmol/l). CONCLUSIONS: The phosphate concentration in corticoid-phosphate formulations varies greatly, and is mainly determined by the chosen buffer. The prednisolone acetate preparations showed physiological phosphate concentrations. For a treatment on a damaged corneal surface, preparations with physiological phosphate concentrations should be used.
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|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||04 Faculty of Medicine > University Hospital Zurich > Institute of Clinical Chemistry|
|DDC:||610 Medicine & health
|Deposited On:||19 Feb 2009 13:40|
|Last Modified:||27 Nov 2013 18:37|
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