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Biogenic silica.

U.S. Patent 8,492,444 (July 23, 2013), "Biogenic Silica from Silica-Containing Plant Material such as Rice Hulls," Neal A. Hammond and J. Steve Peirce (St. Louis, Missouri, USA).

Silica is a common filler for plastics. Recent U.S. legislation has prohibited the use of synthetic silica in organic foods. Amorphous silica is produced by plants, such as sugar cane and rice. The rice plant contains 11-23% silica, compared to about 1-2% in most plants, preventing its use in animal feeds. Hammond and Peirce produced biogenic silica from rice hulls and rice straw for use as an anti-caking agent, excipient, or flavor carrier. Since the plant material is certified as organic, the silica is also certified as organic. The plant material is ground and the silica concentrated by enzyme treatment or burning.

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Title Annotation:INDUSTRY PATENTS; received patent
Author:Corneliussen, Roger
Publication:Plastics Engineering
Article Type:Brief article
Geographic Code:1USA
Date:Oct 1, 2013
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