Abstract To understand the mechanism of antioxidant effect chlorophyll on autoxidation oils in dark, activities several derivatives were compared. Antioxidant observed such as protopor‐phyrin methyl ester and its magnesium chelated compound. Porphyrin seems to be an essential chemical structure for activity chlorophyll. Chlorophyll did not decompose hydroperoxides, but reduced free radicals 1,1‐diphenyl‐2‐picrylhydrazyl. Electron spin resonance spectrum π‐cation radical was recorded during...

We have explored magnetic properties and structural characteristics of Fe/Pt multilayers after annealing at various temperatures in order to clarify the growth process ordered Fe–Pt phase multilayer structures. It is found that rapid diffusion interface occurs 275–325 °C structure directly transforms (fct) when Fe Pt layer thickness almost equal. The ordering parameter S evaluated be 0.50–0.65 300–325 °C, then significantly enhanced ∼1.00 with increasing temperatures. By comparing thermal...

GABA-enriched tempeh-like fermented soybean (GABA-tempeh) was supplemented to the AIN-76 diet and fed for 2 months spontaneously hypertensive rats (SHRs), an animal model of developed hypertension, compare antihypertensive activity with that authentic GABA. The elevation systolic blood pressure in SHRs significantly retarded GABA-tempeh group as well GABA when compared controls, effect lasted two feeding period. urea nitrogen level tended be higher control than GABA-supplemented groups. On...

Abstract The effects of chlorophyll and pheophytin on the autoxidation oils in dark were investigated by oven tests. results indicated that both show antioxidant activity when methyl linoleate is used as substrate. Furthermore, retarded oxidative deterioration triglycerides rapeseed soybean at 30 C. Among four derivatives (chlorophylls a b pheophytins b), showed strongest activity. depended storage temperature kinds oil

A cultivation procedure for the preparation of a new tempeh-like fermented soybean containing high level γ-aminobutyric acid was developed. Steamed soybeans were incubated aerobically with Rhizopus microsporus var. oligosporus IFO 8631 20 h, and then anaerobically 5 h by replacement atmosphere nitrogen. The GABA content in about 30 mg per 100 g dry soybeans, while 370 mg/100 soybeans. incubation several strains species showed that all R. oryzae examined accumulated In particular, 32002 32003...

Camellia oleifera, C. japonica and sinensis are three representative crops of the genus Camellia. In this work, we systematically investigated lipid characteristics these seed oils collected from different regions. The results indicated significant differences in acid value (AV), peroxide (PV), iodine (IV), saponification (SV) relative density above-mentioned camellia (p < 0.05). showed highest AV (1.7 mg/g), PV (17.4 meq/kg). lowest IV (79.9 g/100 g), SV (192.7 mg/g) refractive index...

Abstract A modified method without using benzene for quantitative determination of total carbonyl compounds in heated and frying fats oils has been developed. The analysis is done by the reaction 2,4‐dinitrophenylhydrazine (2,4‐DNP) with aldehydes ketones 2‐propanol. optimal wavelength to determine 420 nm where 2,4‐dinitrophenylhydrazone (2,4‐DNPH) derivatives from saturated unsaturated had same molar absorption coefficient. estimation 2‐propanol instead as a solvent good correlation...

Abstract Although chlorophylls in oils affect oxidative stabilities, little has been known about the prooxidant activity of or their decomposition products. To evaluate activities chlorophyll derivatives, (CHL) A and B, pheophytin (PHY) B pheophorbide (PHO) were added to methyl linoleate (ML). The sample then subjected photooxidation at O C peroxide value absorbance 234 nm measured. Chlorophylls catalyzed oxidation concentrations greater than 2.2×10 −9 mol/g ML, CHL showed a stronger...

Abstract The quantities of chlorophyll (CHL) A and B, pheophytin (PHY) B in 10 kinds refined edible oils were estimated by the fluorometric method. results revealed that CHL PHY present commercial oils. showed highest content at ca. 67% total pigments. Compositional ratios similar different plant Through analysis rapessed every refining step, we determined is not formed during oil refining. In autoxidation soybean to which various amounts mixtures had been added, peroxide value tested...

Fe-Ni cores are excellent candidates for switching regulator inductors, transformers, reactors and in-line noise filters. Herein the influence of phenol binder content on microstructure magnetic properties Fe-50 wt% Ni powder in high frequency range is investigated. Regardless content, all form a disordered A1 phase. The saturation magnetization (4πMs) initial permeability increase as decreases. core with 0.5 shows relatively 4πMs 1.38 T highest value 70.9. Moreover, total loss (Pcv) ranges...

Fe-based amorphous powder cores of Fe–Si–B–Cr–C magnetic and phenolic binder were fabricated, the effects annealing compaction pressure on soft properties core loss investigated. The formation Fe–B α-Fe (Si) phases was confirmed at temperature above 773 K. density gradually increased from 5.3 to 5.5 g/cm3 as increased, resulting in saturation magnetization 4πMs 1.0 T effect studied by using samples annealed 723 Both enhanced with 980 1960 MPa. real part permeability µ’ remained constant for...

Abstract Spin‐current generation via the anisotropic spin‐split effect has been predicted in antiferromagnetic RuO 2 , where symmetry of plays a critical role spin–orbit torque (SOT). This phenomenon garnered attention for its potential to enable energy‐efficient spintronic devices, such as SOT magnetic random‐access memory. In this study, high‐quality (100) epitaxial film with well‐controlled triple‐domain‐structure is analyzed, and it confirmed that out‐of‐plane spin‐current independent...

This paper reports the influence of rare-earth (RE) doping on static and dynamic magnetic properties 50-nm-thick Fe-Ga films grown a glass substrate. With addition RE elements, softness improved at higher content, which might be attributed to induction in-plane uniaxial anisotropy by doping. As for Fe-Ga-RE films, an overall increased effective damping constant (α//,eff) were observed as increase except decreased α//,eff from 0.0228 0.0151 low contents. These results suggest that could...

Abstract Acrolein, which is an irritating and off‐flavor compound formed during heating of vegetable oils, was estimated by the gas–liquid chromatography (GLC). Several oils such as high‐oleic sunflower, perilla, rapeseed, rice bran, soybean were heated at 180 °C for 480 min then concentration acrolein in head space gas determined GLC. The formation greatest perilla oil among tested while it much lower bran sunflower oil. There a good correlation between level linolenate (18:3n‐3) oils. To...

Abstract Volatile aldehydes were generated in the exhaust of high‐oleic safflower oil during heating at 180°C by spraying water into atmospheres with four levels oxygen concentrations (2, 4, 10, and 20%). These quantitatively analyzed HPLC after conversion to 2,4‐dinitrophenyl hydrazones. Ten alkanals (C 2 through C 10 ), eight 2‐alkenals 3 ) three 2,4‐alkadienals 7 , 9 found. aldehyde found be positively correlated both time atmospheric concentration. The total amounts lowest heated an...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAntioxidative mechanism of maize zein in powder model systems against methyl linoleate: effect water activity and coexistence antioxidantsJin Ye Wang, Kenshiro Fujimoto, Teruo Miyazawa, Yasushi EndoCite this: J. Agric. Food Chem. 1991, 39, 2, 351–355Publication Date (Print):February 1, 1991Publication History Published online1 May 2002Published inissue 1 February...

α-Tocopherol (Toc) is the tocopherol isoform with highest vitamin E activity. Since soybean seeds contain a low percentage of α-Toc, increasing α-Toc content to improve activity breeding objective. Little known about genetic variability and composition in soybeans. In present study, we analyzed 1,109 germplasm accessions cultivated wild by high performance liquid chromatography (HPLC) identified three varieties, Dobrogeance, Dobruoza 14 Pancevo Keszthelyi Aproszemu Sarga content. Dobrogeance...

The effect of chlorophyll (Chl) and pheophytin (Phy) on the photooxidation triglycerides was examined. Prooxidant behavior similar to that noted in previously reported experiments using methyl linoleate as a substrate observed. prooxidant activity Phy found be higher than Chl. Moreover, Chl b accelerated greater degree did a, more active a. From compositional variation during photooxidation, it stable oxidation oils. These facts suggest content must when considering oxidative stability edible

Interlayer coupling has been investigated for a series of ${\mathrm{F}\mathrm{e}/\mathrm{F}\mathrm{e}}_{1\ensuremath{-}x}{\mathrm{Si}}_{x}$ $(0.4<~x<~1.0)$ superlattices. The layer ${\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Si}}_{x}$ in the lattices is ferromagnetic $x<0.5$ and causes between Fe layers all spacer thicknesses here. As Si content increases above $x=0.5,$ becomes nonmagnetic simultaneously our current plane sample perpendicular to measurements suggest that rapidly changes its...