Detection of Corn Adulteration in Brazilian Coffee (Coffea arabica) by Tocopherol Profiling and Near-Infrared (NIR) Spectroscopy.

Coffee is a high-value commodity that is a target for adulteration, leading to loss of quality and causing significant loss to consumers. Therefore, there is significant interest in developing methods for detecting coffee adulteration and improving the sensitivity and accuracy of these methods. Corn and other lower value crops are potential adulterants, along with sticks and coffee husks.

Perceptions of conflict of interest: surgeons, internists, and learners compared.

Background: Making a conflict of interest declaration is now mandatory at continuing medical education CME accredited events. However, these declarations tend to be largely perfunctory. This study sought to better understand physician perceptions surrounding conflict of interest.

Phytosterol and tocopherol components in extracts of corn distiller's dried grain.

As the ethanol industry continues to grow, it will become very important to develop value-added markets for its coproducts in order for the industry to remain profitable. Corn distiller's dried grain (DDG) is a major coproduct of ethanol fermentation from corn processed by dry-milling and is primarily sold as livestock feed. The objective of this research was to determine if valuable phytochemicals found in corn oil and corn fiber oil, such as phytosterols and their saturated equivalents, phytostanols, ferulate phytosterol esters (FPE), tocopherols, and tocotrienols, are retained in DDG.

Effect of elevated temperature on development of tocopherolquinones in oils.

Studies were conducted to determine the formation of tocopherolquinones (TOCQ) in heated sunflower (SUN) and soybean (SBO) oils with and without enrichment with added alpha-tocopherol (alpha-TOC). Samples of the heated oils were extracted with acidified hot methanol and analyzed for changes in TOC contents and TOCQ levels by high-performance liquid chromatography (HPLC). In the oils without added alpha-TOC, the alpha-TOC in SUN significantly decreased from 829 ppm at 0 h to 183 ppm at 5 h and to 0 ppm by 10 h.

Capillary electrochromatographic evaluation of vitamin E-active oil constituents: tocopherols and tocotrienols.

Separations of lipid antioxidants, tocopherols (T) and tocotrienols (T3), on octylsilica (OS), octadecylsilica (ODS), phenylsilica, or silica were studied by capillary electrochromatography (CEC)-UV detection. The homologues and isomers of the vitamin E-active compounds were best separated with an OS column. CEC with an ODS column tended to yield broad peaks with poor resolution.