Method for reducing filtrate waste in a manufacturing process of a pharmaceutical product containing benzalkonium chloride
First Claim
1. A method for reducing filtrate waste in a manufacturing process of a pharmaceutical product containing benzalkonium chloride as a preservative, said manufacturing process including the steps of storing product components, mixing the product components and dispensing product to containers, said method comprising the steps of:
- mixing the non-benzalkonium chloride components with benzalkonium chloride to formulate the product;
sterilizing the product by passing same through a microfiltration membrane, said product having a time dependent benzalkonium chloride content, the time dependence being dependent on benzalkonium chloride adsorption equilibration in the microfiltration membrane; and
reducing a benzalkonium chloride equilibration time in the microfiltration membrane by maintaining a selected temperature of the microfiltration membrane and the product therein.
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Accused Products
Abstract
A method for reducing filtrate waste in a manufacturing process of a pharmaceutical product containing benzalkonium chloride as a preservative generally includes the steps of mixing the non-benzalkonium chloride components with benzalkonium chloride to formulate the product and thereafter sterilizing the product by passing same through a microfiltration membrane. In processes in which the product has a time dependent benzalkonium chloride content due to benzalkonium chloride adsorption on a microfiltration membrane, an amount of benzalkonium chloride wasted can be reduced by maintaining a selected temperature of the microfiltration membrane and the product therein.
3 Citations
13 Claims
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1. A method for reducing filtrate waste in a manufacturing process of a pharmaceutical product containing benzalkonium chloride as a preservative, said manufacturing process including the steps of storing product components, mixing the product components and dispensing product to containers, said method comprising the steps of:
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mixing the non-benzalkonium chloride components with benzalkonium chloride to formulate the product; sterilizing the product by passing same through a microfiltration membrane, said product having a time dependent benzalkonium chloride content, the time dependence being dependent on benzalkonium chloride adsorption equilibration in the microfiltration membrane; and reducing a benzalkonium chloride equilibration time in the microfiltration membrane by maintaining a selected temperature of the microfiltration membrane and the product therein. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for reducing loss of benzalkonium chloride in a manufacturing process of an ophthalmic product, said manufacturing process including the steps of storing product components, mixing the product components and dispensing product to containers, said method comprising the steps of:
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prefiltering all non-benzalkonium chloride product components to remove particulates; mixing the prefiltered non-benzalkonium chloride product components with benzalkonium chloride to formulate the product; sterilizing the product by passing same through a microfiltration membrane; and maintaining a microfiltration membrane temperature in order to control benzalkonium chloride adsorption on the microfiltration membrane. - View Dependent Claims (10, 11, 12, 13)
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Specification