Spectrofluorometric Determination of Lasalocid Sodium in Finished Feeds and Premixes
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Abstract A simple, rapid, and sensitive chemical method is described for determining lasalocid sodium in finished poultry feeds and premixes. The drug is extracted with ethyl acetate directly from premixes and after a brief treatment with pH 4.7 buffer from finished feeds. Lasalocid sodium concentration is measured spectrofluorometrically and a correction for nonspecific fluorescence is determined after formation of a lasalocid- boric acid complex. Replicate assays of typical poultry mashes and pellets containing about 0.0075% lasalocid sodium yielded coefficients of variation of 2.8 to 5.0%. Average recovery of lasalocid sodium added in the laboratory at 0.0037, 0.0075, and 0.0112% was 90% with a pooled standard deviation of ±1.86%.
2013 ◽
Vol 10
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pp. 1005-1013
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1969 ◽
Vol 52
(6)
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pp. 1189-1195
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1993 ◽
Vol 76
(4)
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pp. 851-856
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1994 ◽
Vol 77
(5)
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pp. 1263-1274
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