共查询到8条相似文献,搜索用时 6 毫秒
1.
Wolff RL Combe NA Destaillats F Boué C Precht D Molkentin J Entressangles B 《Lipids》2000,35(8):815-825
A survey of the total content of trans-18∶1 acids and their detailed profile in French food lipids was conducted in 1995–1996, and 1999. For this purpose, 37 food
items were chosen from their label indicating the presence of partially hydrogenated vegetable oils (PHVO) in their ingredients.
The content as well as the detailed profile of these isomers was established by a combination of argentation thin-layer chromatography
and gas-liquid chromatography (GLC) on long polar capillary columns. With regard to the mean trans-18∶1 acid contents of extracted PHVO, a significant decrease was observed between the two periods, i.e., from 26.9 to 11.8%
of total fatty acids. However, only minor differences were noted in the mean relative distribution profiles of individual
trans-18∶1 isomers with ethylenic bonds between positions Δ4 and Δ16 for the two periods. The predominant isomer was Δ9–18∶1 (elaidic)
acid, in the wide range 15.2–46.1% (mean, 27.9±7.2%) of total trans-18∶1 acids, with the Δ10 isomer ranked second, with a mean of 21.3% (range, 11.6 to 27.4%). The content of the unresolved
Δ6 to Δ8 isomer group was higher than the Δ11 isomer (vaccenic acid), representing on average 17.5 and 13.3%, respectively.
Other isomers Δ4, Δ5, Δ12, Δ13/Δ14, Δ15, and Δ16, were less than 10% each: 1.0, 1.6, 7.4, 7.1, 1.8, and 1.0%, respectively.
However, considering individual food items, it was noted that none of the extracted PHVO were identical to one another, indicating
a considerable diversity of such fats available to the food industry. A comparison of data for French foods with similar data
recently established for Germany indicates that no gross differences occur in PHVO used by food industries in both countries.
Estimates for the absolute mean consumption of individual isomers from ruminant fats and PHVO are made for the French population
and compared to similarly reconstructed hypothetical profiles for Germany and North America. Differences occur in the total
intake of trans-18∶1 acids, but most important, in individual trans-18∶1 isomer intake, with a particular increase of the Δ6–Δ8 to Δ10 isomers with increasing consumption of PHVO. It is inferred
from the present and earlier data that direct GLC of fatty acids is a faulty procedure that results (i) in variable underestimates
of total trans-18∶1 acids, (ii) in a loss of information as regards the assessment of individual isomeric trans-18∶1 acids, and (iii) in the impossibility of comparing data obtained from human tissues if the relative contribution of
dietary PHVO and ruminant fats is not known. 相似文献
2.
Wang Y Liu J Lin B Wang C Li Q Liu S Yan L Zhang S Iwamori M 《International journal of molecular sciences》2011,12(6):3409-3421
Objective
To detect the expression and clinical significances of Lewis y antigen and integrin αv, β3 in epithelial ovarian tumors, and to explore the expression correlation between Lewis y antigen and integrin αv, β3.Methods
Immunohistochemical staining was performed in 95 cases of epithelial ovarian cancer, 37 cases of borderline tumors, 20 cases of benign tumors, and 20 cases of normal ovarian tissue, for the detection of Lewis y antigen and integrin αv, β3 expressions, and to analyze the relationship between Lewis y antigen and integrin, and the relationship between clinical and pathological parameters of ovarian cancer. In addition, immunofluorescence double labeling was utilized to detect the expression correlation between Lewis y antigen and integrin αv, β3 in ovarian cancer.Results
In epithelial ovarian tumors, the expression rate of Lewis y antigen was 81.05%, significantly higher than that of borderline (51.53%) (P < 0.05) and benign (25%) (P < 0.01) tumors, and normal ovarian tissues (0) (P < 0.01). The expression rate of integrin αv, β3 in malignant epithelial ovarian tumors was 78.95% and 82.11%, respectively, significantly higher than that of the borderline (45.94%, 40.54%) (both P < 0.05), benign group (10.00%, 15.00%) (both P < 0.01) and normal ovary group (5%, 15%) (both P < 0.01).Conclusions
Lewis y and integrins αv, β3 are relevant to pelvic and abdominal diffusion and metastasis of ovarian cancer cells, suggesting that these two molecules mediate a boosting function for tumor metastasis. 相似文献3.
ABSTRACTHeterogeneous catalytic ozonation is an efficient technology for degrading refractory organic pollutants in water. However, most studied heterogeneous catalysts for catalytic ozonation were powders, which were not practically available for continuous fixed-bed reactor in water treatment. In this work, manganese, iron and cerium oxides on γ-Al2O3 pellets were synthesized and used as heterogeneous catalysts for catalytic ozonation in a continuous fixed-bed reactor. Results showed that all the prepared metal oxides on γ-Al2O3 pellets exhibited facilitated catalytic ozonation for degrading refractory contaminates compared with ozonation alone and catalytic ozonation on pure γ-Al2O3 pellets. The cerium oxides supported on γ-Al2O3 pellets (CeO2/γ-Al2O3) performed best catalytic performance with the COD removal efficiency of 64.3% and TOC removal efficiency of 41.7%. Moreover, the catalytic activity was further enhanced by the synergistic effect of the bimetallic oxides on γ-Al2O3 pellets (CeO2-Fe2O3/γ-Al2O3). This study is expected to help to encourage further research and applications in AOPs based on the success of this work in designing heterogeneous catalysts available for continuous fixed-bed reactor. 相似文献
4.
Bransden MP Dunstan GA Battaglene SC Cobcroft JM Morehead DT Kolkovski S Nichols PD 《Lipids》2004,39(3):215-222
We determined the effect of dietary long-chain (≥C20) PUFA (LC-PUFA), 20∶5n−3 and 22∶6n−3, on larval striped trumpeter (Latris lineata) biochemistry through early development and during live feeding with rotifers (Brachionus plicatilis). Rotifers were enriched using seven experimental emulsions formulated with increasing concentrations of n−3 LC-PUFA, mainly
20∶5n−3 and 22∶6n−3. Enriched rotifer n−3 LC-PUFA concentrations ranged from 10–30 mg/g dry matter. Enriched rotifers were
fed to striped trumpeter larvae from 5 to 18 d post-hatch (dph) in a short-term experiment to minimize gross deficiency symptoms
such as poor survival that could confound results. No relationships were observed between larval growth or survival with dietary
n−3 LC-PUFA at 18 dph. The larval FA profiles generally reflected those of the rotifer diet, and significant positive regressions
were observed between most dietary and larval FA at 10, 14, and 18 dph. The major exception observed was an inverse relationship
between dietary and larval 22∶5n−3. The presence of 22∶5n−3 in elevated amounts when dietary 22∶5n−3. The presence of 22∶5n−3
in elevated amounts when dietary 22∶6n−3 was depressed suggests that elongation of 20∶5n−3 may be occurring in an attempt
to raise body concentrations of 22∶6n−3. We hypothesize that accumulation of 22∶5n−3 might be an early indicator of 22∶6n−3
deficiency in larval fish that precedes a reduction in growth or survival. A possible role of 22∶5n−3 as a biochemical surrogate
for 22∶6n−3 is discussed. 相似文献
5.
6.
V. G. Konakov 《Glass Physics and Chemistry》2002,28(3):135-138
The exponent of oxygen ion activity pO =
for melts in the Na2O–B2O3–SiO2 system along the composition joins with constant sodium oxide contents of 25, 30, and 35 mol % is studied by an electromotive force (emf) technique at 950°C. Measurements are performed using two variants of the technique of determining pO, namely, in high-temperature salt solutions of oxide systems in KF and with a salt bridge between two oxide melts. It is shown that the basicity of melts increases with an increase in the Na2O content at a constant concentration ratio of glass-forming oxides. The acid–base properties of sodium borosilicate melts are simulated under the assumption of acid–base interaction between the components. It is found that the basicity of the studied melts along the composition joins with constant sodium oxide contents of 30 and 35 mol % is governed primarily by the acid–base interaction in Na2O–B2O3 and Na2O–SiO2 binary systems and, to a lesser extent as compared to low-alkali composition joins (below 20 mol % Na2O), by the formation of Na2O · B2O3 · 2SiO2 and Na2O · B2O3 · 6SiO2 ternary compounds. 相似文献
7.
S. A. Petrov L. F. Grigor'eva O. Yu. Sinel'shchikova T. Yu. Sinel'shchikova V. V. Gusarov 《Glass Physics and Chemistry》2003,29(3):316-321
The possibility of forming hollandite-type phases during the solid-phase reaction in the Cs2O(MeO)–Al2O3–TiO2 (Me = Ba, Sr) systems is studied. It is revealed that, in the Cs2O–BaO–Al2O3–TiO2 system, the region of existence of Cs
x
Ba1 – x/2Al2Ti5O14 solid solutions with a hollandite-type structure lies in the concentration range 0 x 0.7. In the SrO–BaO–Al2O3–TiO2 system, no solid solutions with a hollandite-type structure are observed. The mechanism and kinetics of formation of the Cs
x
Ba1 – x/2Al2Ti5O14 (0 x 0.7) solid solutions are analyzed, and the optimum conditions for synthesis of these solutions are determined. 相似文献
8.
Crystallization of zeolites from the gels of the (3–x)К2О–xR2O(RO)–0.05Na2O–Al2O3–5SiO2–100H2O composition where x was varied from 0 to 3 and R = Li, Na, Rb, Cs, Ba, tetraethylammonium, tetrapropylammonium, and tetrabutylammonium, has been performed by hydrothermal synthesis. The influence of various cationic ratios on the final product of crystallization depending on the synthesis temperature has been studied at constant SiO2: A2lO3 and H2O: SiО2 ratios. The correlation between the cationic composition of the initial gels, their structure, and the structure of the crystallizing zeolites has been estimated. 相似文献