In preparing samples for analysis of antioxidants in fats and oils, melted fat and/or oil is mixed with Celite, blended with acetonitrile, and the acetonitrile is extracted with mixed ethers. The mixed ethers are evaporated, and the oily residue is incorporated with alumina acid. The alumina mixture is placed in a chromatographic column and eluted with aqueous methanol, and the methanolic eluate is extracted into mixed ethers. The ether extract is clean enough for TLC as well as GLC determinations. Recoveries from tallow, lard, and corn oil spiked at 16.7 and 66.7 ppm with BHA and BHT ranged from 80 to 95% for BHA and 91 to 115% for BHT.
Dried red beet pulp used as an adulterant in capsicum spices may be detected by removing the capsicum oil with petroleum ether and isolating the red beet particles from the decolorized spice. The beet particles are identified and confirmed by microscopic examination, paper chromatography, and spectrophotometric analysis
A visual method is presented that enables the analyst to isolate clumps of mold from dark solutions and from colored and irregular bottles and to examine the material microscopically. The solutions to be examined are passed through a glass tube for visual examination, and any observed extraneous material is deposited directly onto a slide. Physical characteristics are not altered, and all visible mold clumps can be accurately counted and measured.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.