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Full-Text Articles in Life Sciences

Oxidative Stability And Aromascan Analyses Of Corn Oils With Altered Fatty Acid Content, N. Shen, Susan A. Duvick, Pamela J. White, Linda M. Pollak Dec 1999

Oxidative Stability And Aromascan Analyses Of Corn Oils With Altered Fatty Acid Content, N. Shen, Susan A. Duvick, Pamela J. White, Linda M. Pollak

Food Science and Human Nutrition Publications

This project was designed to evaluate the oxidative stability of corn oils with increased total saturated fatty acid composition and to test the feasibility of using the AromaScan, an “electronic nose,” to detect the odors/aromas produced by oxidation. Corn oils with traditional (13.1%) and elevated (14.7 to 17.1%) total saturated fatty acid percentages were evaluated for their oxidative quality. Oils from five corn genotypes were extracted, refined, bleached, and deodorized (RBD) in the laboratory. Two replications, separated at the point of extraction, were evaluated for each genotype. The RBD corn oils (18.0 g) were stored ...


Excretion Of 14c-Fumonisin B1, 14c-Hydrolyzed Fumonisin B1, And 14c-Fumonisin B1-Fructose In Rats, William R. Dantzer, Joan Hopper, Kathleen Mullin, Suzanne Hendrich, Patricia A. Murphy Sep 1999

Excretion Of 14c-Fumonisin B1, 14c-Hydrolyzed Fumonisin B1, And 14c-Fumonisin B1-Fructose In Rats, William R. Dantzer, Joan Hopper, Kathleen Mullin, Suzanne Hendrich, Patricia A. Murphy

Food Science and Human Nutrition Publications

14C-Fumonisin B1 (FB1) was produced by Fusarium proliferatum M-5991 in modified Myro liquid medium and purified to >95% purity with a specific activity of 1.7 mCi/mmol. Nine male and nine female F344/N rats were each dosed by gavage with 0.69 μmol of 14C-FB1, 14C-hydrolyzed FB1, or 14C-FB1-fructose/kg body weight. Urinary excretion of 14C-FB1 and 14C-FB1-fructose was 0.5% and 4.4% of the total dose, respectively, and was similar between male and female rats. Urinary excretion of 14C-hydrolyzed HFB1 was significantly greater (P > 0.05) in female rats as compared with male rats (17.3 ...


Inhibition Of Non-Haem Iron Absorption In Man By Polyphenolic-Containing Beverages, Richard F. Hurrell, Manju B. Reddy, James D. Cook Apr 1999

Inhibition Of Non-Haem Iron Absorption In Man By Polyphenolic-Containing Beverages, Richard F. Hurrell, Manju B. Reddy, James D. Cook

Food Science and Human Nutrition Publications

The effects of different polyphenol-containing beverages on Fe absorption from a bread meal were estimated in adult human subjects from the erythrocyte incorporation of radio-Fe. The test beverages contained different polyphenol structures and were rich in either phenolic acids (chlorogenic acid in coffee), monomeric flavonoids (herb teas, camomile (Matricaria recutita L.)), vervain (Verbena officinalis L.), lime flower (Tilia cordata Mill.), pennyroyal (Mentha pulegium L.) and peppermint (Mentha piperita L.), or complex polyphenol polymerization products (black tea and cocoa). All beverages were potent inhibitors of Fe absorption and reduced absorption in a dose-dependent fashion depending on the content of total polyphenols ...


Estrogenic Activity Of Glycitein, A Soy Isoflavone, Tong T. Song, Suzanne Hendrich, Patricia A. Murphy Mar 1999

Estrogenic Activity Of Glycitein, A Soy Isoflavone, Tong T. Song, Suzanne Hendrich, Patricia A. Murphy

Food Science and Human Nutrition Publications

Glycitein (4‘,7-dihydroxy-6-methoxyisoflavone) accounts for 5−10% of the total isoflavones in soy food products. The biological activity of this compound has not been reported to date, although numerous studies have been performed with the other soy isoflavones, daidzein and genistein. Glycitein was isolated from soy germ to 99% purity. Weaning female B6D2F1 mice were dosed with glycitein (3 mg/day), genistein (3 mg/day), and diethylstilbestrol (DES) (0.03 μg/day) in 5% Tween 80 by gavage for 4 days. A control group received an equal volume of 5% Tween 80 solution daily. The uterine weight increased 150% with ...


Thermal Properties Of Starch In Corn Variants Isolated After Chemical Mutagenesis Of Inbred Line B73, F. F. Yamin, M. Lee, Linda M. Pollak, Pamela J. White Mar 1999

Thermal Properties Of Starch In Corn Variants Isolated After Chemical Mutagenesis Of Inbred Line B73, F. F. Yamin, M. Lee, Linda M. Pollak, Pamela J. White

Food Science and Human Nutrition Publications

The starch from eight ethyl methanesulfonate (EMS) treated M4 families of the corn (Zea mays L.) inbred line B73 was analyzed using differential scanning calorimetry (DSC), a Rapid Visco Analyser (RVA), a texture analyzer (TA), and scanning electron microscopy (SEM) coupled with image analysis. The eight families were chosen from 144 families previously selected for having starch with unusual DSC parameters. Apparent amylose contents of the starch from the eight families generally were lower than that of the control. According to DSC, starches from mutagenized families tended to have lower onset temperature (T0) of gelatinization, enthalpy (ΔH) of ...