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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.


Written Paper

Determination of glucosinolates in mustard by high-performance liquid chromatography-electrospray mass spectrometry  [1997]

Zrybko, C.L. (Nabisco, Inc., East Hanover, NJ.); Rosen, R.T.;

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A method was developed to determine glucosinolates in mustard seeds by reverse phase HPLC using volatile ion-pairing reagents followed by UV detection at 235 nm. Two external standards, phenethylglucosinolate and sinigrin were used to quantify results. The identities of individual mustard glucosinolates were confirmed by negative ion electrospray mass spectrometry as was LC peak purity. This LC/MS method may be used to identify species which are not commercially available as pure standards since mass spectrometry can be used to check for all known glucosinolate anions. Three mustard types were chosen from the Brassica species: yellow (Brassica hirta), brown, and oriental (Brassica juncea). Eleven mustard samples representing harvest areas of southwestern Canada were analyzed in triplicate for glucosinolate content. Percent coefficient of variation between triplicate samples of the same batch was often less than 10%