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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

Journal Article

Journal article

Optimization and orthogonal design of an ultrasonic-assisted aqueous extraction process for extracting chlorogenic acid from dry tobacco leaves  [2012]

Mazvimba, Martin Tongai; YU, Ying; CUI, Zhi-Qin; ZHANG, Ying;

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Processing parameters for heat reflux and ultrasonic-assisted extraction techniques were optimized. Optimal operating conditions, extraction solvents and extraction yields for both methods were established. Although methanol showed high extraction efficiency in heat reflux extraction, residual amounts of methanol caused adulteration of extracts. To circumvent this drawback, a novel ultrasonic-assisted aqueous extraction process was optimized and orthogonally designed to pave the way for replacing the toxic organic solvent, methanol with water. A new approach which utilizes fractional volumes of an extraction solvent was developed to minimize solvent consumption, improve chlorogenic acid solubility in water and enhance its aqueous extraction from dried tobacco leaves. Desired trajectories for the new ultrasonic assisted aqueous extraction process were found.

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Chinese journal of natural medicines

ISSN : 1875-5364