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... The previous paper in this series discussed the uncatalyzed autoxidation of alkali cellulose and suggested that the reaction proceeds via a chain mechanism involving transient free radicals. The present paper describes the effect of certain transition metal catalysts on the kinetics of oxygen absorption and cellulose depolymerization. It is further shown that the reaction is subject to catalysis b ...
... An extensive trial of acetate drapery fabrics dyed with new "gas-fast" blues has shown that active agents in the atmosphere, in addition to the oxides of nitrogen, can cause fading in service. This fading is oxidative in nature. It has been reproduced by an accelerated laboratory test in which fabrics have been exposed to concentrations of ozone somewhat higher than those ordinarily found in the a ...
... Epsilon polycaproamide (nylon 6), with more than twenty years' effort behind it in Europe, is now established as a commercial fiber in the U.S. Historically, its de velopment goes back at least sixty years, when it narrowly missed becoming the first truly man-made fiber. Although the molecular structure of nylon 6 is almost identical to that of nylon 6,6, its melting point is lower, probably due t ...
... Polypropylene multifilament yarns are being used in a variety of industrial and consumer products. Penetration into some textile markets, however, has been hampered by poor resistance to laundering. Cyclic wash-dry laundering causes heat-stabilized yarns to lose antioxidant and strength more rapidly than the sum of the effects of washing or drying alone. This phenomenon plus other experimental evi ...
... The necessity and difficulty of developing an ideal formulation of a chemical coating for optimum man-made fiber processing on textile equipment under varying conditions is stressed. In the absence of such a coating, the fiber has little economic value. The phrase "spin-finish" is defined. The various compounds chiefly used are listed by chemical classes under luhricants without surface activity, ...
... Immersion of fluorescently whitened wool in aqueous solutions of reducing agents during exposure to simulated sunlight has been shown to retard or prevent photoyellowing. The most effective reducing agents of the wide range examined were thioglycolic acid, sodium sulfite, and trishydroxymethylphosphine. Less photodecomposition of trytophan and histidine residues occurs during irradiation of either ...
... The changes in the size distribution of polycaprolactam that take place during melting and melt-spinning have been studied. During melting under a nitrogen atmosphere, thermal degradation as well as post polymerization takes place. Spinning the polymer under atmospheric conditions, thermal, thermo-oxidative, and mechanical degradations come into play. Post polymerization is also operative in this ...
... Flavor and oxidative stabilities were studied by organoleptic evaluation and chemical analysis of three different samples of soybean oil: unhydrogented (I); hydrogenated with nickel catalyst (II); and hydrogenated with copper-chromium catalyst (III). Analyses for these oils were: I II III iodine Value 138 109 113 Linolenate, % 8.3 3.3 0.4 Each oil was deodorized with the addition of either citric ...
... Whole dried soybean seeds were investigated to determine the nature of their antioxidant activity. Activity was measured by rates of carotene bleaching in the coupled oxidation of linoleic acid and β‐carotene. Methanolic extracts of the soybeans were found to possess potent antioxidant ability. Paper and Sephadex column chromatography gave incomplete resolution of individual components. Therefore, ...
... Abstract: The use of soybeans in foods is hampered by the green beany, grassy flavor, and bitter tastes found in soybeans. The chemistry of this flavor development is discussed. Methods to diminish the off-flavors are explained. The techniques include use of heat, acid, alcohol, naturally occurring antioxidants, a common amino acid or alcohol dehydrogenase. The use of fluorocarbons to separate all ...
... Butylated hydroxyanisole (BHA) was inhibitory to growth of three proteolytic strains of Clostridium botulinum in prereduced thiotone yeast-extract glucose medium (TYG) (pH 7.0) at 37 C. There was outgrowth and toxin production by strain 10755A spores when 25 ppm of BHA was present in the medium, whereas growth was inhibited by 50 ppm of BHA. Strains 62A and 213B were inhibited by 25 ppm of BHA thr ...
... Abstract: Defatted and partially defatted peanut flours were compared with soy flours as components of fortified food blends containing partially or fully gelatinized corn meal, nonfat dry milk, soybean oil, vitamins, and minerals. Changes in flavor, peroxides, free fatty acids, available and added L-lysine HCl after storage for 2, 6, and 12 months were evaluated and found satisfactory. Protein ef ...
... Abstract: USDA's Northern Regional Research Center studies food quality and safety. Immobilized enzymes were used to prepare polymetric derivatives and to remove undesirable components in soy foods. A process of extracting, aspirating, grinding, and screening corn germ was developed to produce a high quality flour that can be used in many foods. Corn-soy-milk is a nutritionally balanced food blend ...
... The effect of butylated hydroxyanisole (BHA) on synthesis of the major lipid classes was studied using Tetrahymena pyriformis as a model cellular system. Initial changes in the amount of lipids were observed after 3 h of exposure to the antioxidant. After 24 h of exposure to increasing concentrations of BHA, there were significant differences in the percentage of [14C]acetate incorporated into var ...
oxidation; separation; high performance liquid chromatography; phosphatidylcholines; soybeans; methanol; antioxidants
Abstract:
... Soy phosphatidylcholine (PC) has been separated into its major molecular species by reversephase high pressure liquid chromatography (HPLC). An aqueous methanol gradient was used that allowed detection of the various species by their absorbance at 206 nm. Oxidized species were detected by their absorbance at 234 nm and were resolved from the unoxidized species. This technique has been used to sepa ...
... SUMMARY: A STUDY OF THE SEX PHEROMONE OF THE LEEK MOTH, ACROLEPIOPSIS ASSECTELLA (LEPIDOPTERA: ***ACROLEPHOAE) The main component of the sex pheromone secretion produced by virgin females of A. asseclella has beeb identified as Z-11 hexadecenal (Z₁₁HDal) by GC analysis and mass spectrometry, EAG tests, and behavioural assays. Z₁₁HDal elicited the highest EAG response of all C₁₂to C₁₈ acetates, ald ...
... Protein ingredients prepared from glandless cottonseed, peanut and soybean show varying degrees of antioxidative effectiveness in model systems and in food systems. This paper presents data showing that nonenzymatic browning between oilseed protein ingredients and a reducing sugar can enhance the antioxidant value of oilseed ingredients. Defatted flours and protein isolates of the oilseeds were mi ...
... The effect of added potassium sorbate (0.25%), BHA or BHT (100 or 200 ppm) on growth of Staphylococcus aureus in synthetic media having water activity and pH adjusted to values found in process cheese was studied. Potassium sorbate (0.25%) had no significant effect on growth of S. aureus in this model system at pH 6.0 and 30°C. BHA and BHT (100 and 200 ppm) showed some growth inhibition of S. aure ...
... Experimental rat diets containing casein as the sole protein source were aged at 24 and 37.degree. C for 6 mo. Test variables included antioxidant effect and types of casein, fat and Fe. Samples were analyzed by a trained, experienced sensory panel for rancid odor intensity and by gas chromatography for pentanal and hexanal formation. Antioxidants in the diets effectively prevented rancid odor dev ...
... Room odor characteristics produced by heated soybean oil (SBO) and soybean oils hydrogenated with copper (CuHSBO) and nickel (NiHSBO) catalysts were evaluated by a trained panel. Oils were intermittently heated to 190 C for total heating periods of 5, 15 and 30 hr. Oil additives investigated included methyl silicone (MS), tertiary butylhydroquinone (TBHQ) and a polymeric antioxidant in various com ...
soybean oil; salad dressings; food processing; antioxidants; hydrogenation; shelf life
Abstract:
... Flavor deterioration of salad dressings was investigated to determine the effect of hydrogenation of the oil, additives and storage conditions. Flavor quality tests were developed and correlated with gas chromatographic analyses of volatile compounds in oils separated from the dressings. Hydrogenation of soybean oil with copper and nickel catalysts effectively increased the storage stability of sa ...
... This paper presents practical knowledge about dissolving and spinning cellulose in the NMMO-H₂O system described in the Kodak and Akzona patents. From the highly hydrated NMMO commercialized by Texaco and a viscose pulp with an average polymerization degree of 700, we made true solutions in two stages: swelling of the cellulose and evaporation of the largest part of the water in a mixing-kneading ...
... A number of antioxidants were added to ground meat prior to cooking to achieve oxidative stability. The 2‐thiobarbituric acid (TBA) numbers of cooked‐meat samples after storage for up to 35 days were determined. Of the antioxidants tested, butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), propyl gallate (PG), t‐butylhydro‐quinone (TBHQ), trihydroxybutyrophenone (THBP), nordihydro‐gua ...
... Males of Ligurotettix coquilletti, a univoltine grasshopper associated with Larrea tridentata shrubs in the Sonoran and Mohave Deserts, defend individual host plants as their mating territories. Field studies conducted between 1982 and 1985 demonstrated that certain Larrea shrubs were occupied by territorial males each year while others remained consistently vacant. Males that matured earliest in ...
... Dry-milled corn germ, soybean and cottonseed flakes were extracted (at 70-90 C and 12,000 psi) with supercritial carbon dioxide (SC-CO2) to yield crude oils. Oxidative stability of the crude oils was determined and compared to similar products obtained by conventional expeller and/or prepress solvent extraction. Under Schall oven storage conditions (60 C), SC-CO2-extracted oils undergo rapid deter ...
... Several antioxidants as well as vacuum packaging and changes in frozen storage temperatures (-7 degrees C and -20 degrees C) were tested for their effect on the peroxide values and free fatty acids (FFA) of frozen minces from Gulf menhaden, Brevoortia patronus and Atlantic menhaden, Brevoortia tyrannus. Vacuum packaging was the most effective in retarding oxidative rancidity. Storage at -20 degree ...
... The minimum inhibitory concentration (MIC) of several phenolic compounds against eight strains of Listeria monocytogenes in tryptose phosphate agar (TPA) was determined. Based upon concentration, the most effective compound was the phenolic antioxidant tertiary butylhydroquinone (TBHQ) which had a MIC of 64 μg/ml. Among the FDA approved food antimicrobials, the most effective was propyl paraben wi ...
... Ground beef patties treated with metal chelators, free radical scavengers, rosemary and sodium alginate were examined by chemical (TBARS and gas chromatography) and sensory means in regard to warmed-over flavor (WOF). A highly trained analytical sensory panel evaluated the patties for desirable descriptors, such as cooked beef brothy (CBB) and for WOF descriptors, painty and cardboardy. Results sh ...
Trichoplusia ni; antioxidants; carbaryl; synergism; metabolism; insect control
Abstract:
... Plant chemicals naturally exist in complex mixtures, which can interact either additively, synergistically, or antagonistically. We investigated the potential interactions of three naturally occurring antioxidants--nordihydroguaiaretic acid (NDGA), safrole, and alpha-tocopherol--with the general insecticide carbaryl to affect the performance of cabbage looper larvae (Trichoplusia ni). The cabbage ...
... The parsnip webworm, Depressaria pastinacella (Lepidoptera: Oecophoridae), feeds on plants rich in furanocoumarins, phototoxic allomones. Final-instar larvae possess high levels of activities of antioxidant enzymes (superoxide dismutase, catalase, glutathione reductase), which detoxify oxygen radicals generated from the furanocoumarins of their host plants. When added to an artificial diet, three ...
... Decomposed products of 2-tert-butylhydroquinone (TBHQ) at frying temperature in model system were identified and characterized. An attempt was made to determine the functions of the decomposed compounds in foods using model system. Tert-butylbenzoquinone (TBBQ) was identified as the primary and major oxidation product of TBHQ. Interconversion between TBHQ and TBBQ was the most important role in an ...
... The effects of antioxidants (0.01 or 0.02% of total fat), salt level (0.375 or 0.750%) and salt type (NaCl, KCl or a 65% NaCl + 35% KCl combination) in a 2 X 2 X 3 factorial arrangement on the quality of restructured beef steaks were determined. Meat blends with 0.02% antioxidant had lower thiobarbituric acid (TBA) values than those with 0.01% after 85 to 155 days of frozen storage. Steaks with no ...
... The effects of different processing methods and antioxidants on the oxidative stability and carbon dioxide formation in low fat dry milk at 65 degrees C for 8 days were determined by measuring volatile compound formation, oxygen disappearance, and carbon dioxide formation in the gas-tight sample bottle by gas chromatography. Foam spray dried or steam jacketed centrifugal wheel atomization dried mi ...
... The effects of 0, 1.75 X 10-5, 3.50 X 10-5 , and 5.25 X 10-5 M lutein, zeaxanthin, lycopene, isozeaxanthin, and astaxanthin which contain 10, 11, 11, 11, and 13 conjugated double bonds, respectively, on the photooxidation of soybean oil containing 4.4 X 10-9 M chlorophyll were studied by measuring peroxide values of the oil. The antioxidant effectiveness of the carotenoids increased as the number ...
... UV absorbers and antioxidants topically applied to upholstery fabrics to reduce fading, separately and in conjunction with soil repellent finish formulations containing UV absorbers, were evaluated in this study. Over fifty upholstery fabrics were initially evaluated and fourteen were selected for further study. The fabrics were then topically treated with commercially available soil repellent fin ...
... Salt and combinations of salt with phosphates and antioxidants were investigated for their role in lipid oxidation and discoloration in restructured beef, pork, and turkey steaks during storage at -10 degrees C for 16 wk, 8 wk, and 8 wk respectively. Lipid oxidation and discoloration occurred simultaneously in pork and turkey, but beef color loss occurred much earlier than did lipid oxidation. Pho ...
... Two‐year‐old red spruce (Picea rubens Sarg.) seedlings were exposed to various levels of ozone, from 0.4 to 3 times ambient levels, in open‐top chambers in Ithaca, NY, USA. Exposures, which varied with changes in day length, were from 30 May to 16 December 1987 and 1 June to 1 December, 1988. During the second exposure period, ascorbic acid, total and oxidized glutathione, α‐tocopherol, and supero ...
... Photo-activated plant secondary compounds have been shown to be toxic to many organisms including insects. Insect defenses include behavioral mechanisms such as light avoidance, as well as specific biochemical defenses such as antioxidants and antioxidant enzymes. These antioxidant defenses eliminate or quench the deleterious singlet oxygen and free radicals formed by these phototoxins. In this pa ...