Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Manuel Holcomb"'
Autor:
Dwight W. Miller, Jon G. Wilkes, Eric D. Conte, Manuel Holcomb, Yongkyoung Kim, John B. Sutherland
Publikováno v:
Journal of Chromatography A. 880:3-33
Off-flavors in foods may originate from environmental pollutants, the growth of microorganisms, oxidation of lipids, or endogenous enzymatic decomposition in the foods. The chromatographic analysis of flavors and off-flavors in foods usually requires
Publikováno v:
The Journal of Supercritical Fluids. 9:118-121
A supercritical-fluid extraction (SFE) method has been developed that extracts aflatoxins (B1, B2, G1 and G2) from spiked corn using modified supercritical carbon dioxide. Methanol is added to the SFE extraction cell containing the corn layered betwe
Autor:
Manuel Holcomb, Harold C. Thompson
Publikováno v:
Journal of Microcolumn Separations. 7:451-454
A new method has been developed for the analysis of fumonisin B1 in corn using capillary electrophoresis. Fumonisin B1 is the major fumonisin metabolite produced by the fungus Fusarium moniliforme and has been implicated in human and animal diseases.
Publikováno v:
Journal of Liquid Chromatography. 17:4121-4129
The o-phthalaldehyde (OPA) derivative of fumonisin B1 was prepared in the presence of 2-methyl-2-propanethiol (tert-butyl thiol). A hydrodynamic voltammogram for the derivative indicated that the optimum voltage for maximum electrochemical response w
Publikováno v:
Journal of Agricultural and Food Chemistry. 41:764-767
A new, sensitive, and stable method has been developed for the analysis of fumonisin B 1 in rodent feed. Fumonisin B 1 , which is the major fumonisin metabolite produced by the fungus Fusarium moniliforme, has been implicated in human and animal dise
Autor:
M. P. Chiarelli, Harold C. Thompson, Carl E. Cerniglia, J. B. Sutherland, Jackson O. Lay, L. J. Hankins, Manuel Holcomb, W. A. Korfmacher
Publikováno v:
Journal of Agricultural and Food Chemistry. 41:357-360
Flasks containing moistened, autoclaved corn, unmilled rice, peanuts, soybeans, and laboratory rodent feed were inoculated with Fusarium moniliforme NRRL 13616 and incubated in the dark at 25 degrees C. After 24 days, the cultures were extracted with
Publikováno v:
Journal of Chromatography A. 624:341-352
Several chromatographic methods for the determination of aflatoxins in agricultural and food products are reviewed. During the past two decades, identification and determination of aflatoxins were done by thin-layer chromatography (TLC) because it wa
Publikováno v:
Journal of Analytical Toxicology. 15:289-292
Thermospray mass spectrometry (TSMS) was used to identify the derivatives formed when iodine is reacted with aflatoxins B1 and G1 at approximately 70 degrees C to enhance fluorescence. It was found that stable derivatives were formed by addition of a
Autor:
Manuel Holcomb, Harold C. Thompson
Publikováno v:
Journal of Agricultural and Food Chemistry. 39:137-140
An existing method was modified for application to the analysis of aflatoxins in vitamin-fortified rodent feeds. The aflatoxins were separed on an affinity column, quantified by HPLC using postcolumn derivatization. The minimun detectable limit was 0
Autor:
Jon G. Wilkes, Michel J. Bertrand, Xiaoxi Cao, Katherine L. Glover, Simon Letarte, John B. Sutherland, Fatemeh Rafii, Susan A. McCarthy, Manuel Holcomb
Publikováno v:
Journal of the American Society for Mass Spectrometry. 13(7)
This work shows how fingerprints of mass spectral patterns from microbial isolates are affected by variations in instrumental condition, by sample environment, and by sample handling factors. It describes a novel method by which pattern distortions c