The aim of this study was to evaluate the effects of thermooxidation of S. ochocoa oil on its quality and on the biochemical and anthropometric parameters of Wistar rats. S. ochocoa seeds from the Lekoumou department ...The aim of this study was to evaluate the effects of thermooxidation of S. ochocoa oil on its quality and on the biochemical and anthropometric parameters of Wistar rats. S. ochocoa seeds from the Lekoumou department were used for oil extraction at the press. The parameters measured were oil content and chemical indices, determined for samples of oil unheated and heated to 220˚C as a function of the number of heatings and the environment (open air, freezer). Two diets were created: the control diet and the treated diet, in which 10% oil was substituted for the control diet. These diets were fed to the rats for 28 days. Biochemical, anthropometric and atherogenicity parameters were measured. The results show that S. ochocoa oil has a saturated character and a blackish color, and it solidifies or coagulates rapidly. Unheated oil samples placed in a freezer and unheated samples placed in a simple freezer have relatively lower acid values (0.860 and 0.703 mg KOH/g respectively) than other samples. Acid index values for heated samples increase progressively with the number of heatings (1.063 ± 0.005 for 1st heating, 1.290 ± 0.010 for 2nd heating and 1.890 ± 0.006 for 3rd heating). The oil’s peroxide value increased with temperature and oxidation (65.6 ± 0.03 for unheated oil vs. 97.9 ± 003 for oil heated to 220˚C). The diet supplemented with this oil resulted in a significant increase in plasma cholesterol levels, and a significant decrease in triglyceride levels. The plasma atherogenicity index reveals the risk of cardiovascular disease associated with this food.展开更多
The recent developments in the photoinitiated cross-linking of polyethylene and the significant breakthrough of its industrial application are reviewed. The enhanced photo-initiation system, the dynamics of photoiniti...The recent developments in the photoinitiated cross-linking of polyethylene and the significant breakthrough of its industrial application are reviewed. The enhanced photo-initiation system, the dynamics of photoinitiated crosslinking, the optimum conditions, the crystal morphological structures and related properties, and the photo- and thermo-oxidation stability of photocrosslinked polyethylene (XLPE) materials have been elucidated systematically. A new technique for producing photocrosslinked XLPE-insulated wire and cable is described in detail. It can be expected that the future applications of photocrosslinking technique of polyolefins will be very promising.展开更多
文摘The aim of this study was to evaluate the effects of thermooxidation of S. ochocoa oil on its quality and on the biochemical and anthropometric parameters of Wistar rats. S. ochocoa seeds from the Lekoumou department were used for oil extraction at the press. The parameters measured were oil content and chemical indices, determined for samples of oil unheated and heated to 220˚C as a function of the number of heatings and the environment (open air, freezer). Two diets were created: the control diet and the treated diet, in which 10% oil was substituted for the control diet. These diets were fed to the rats for 28 days. Biochemical, anthropometric and atherogenicity parameters were measured. The results show that S. ochocoa oil has a saturated character and a blackish color, and it solidifies or coagulates rapidly. Unheated oil samples placed in a freezer and unheated samples placed in a simple freezer have relatively lower acid values (0.860 and 0.703 mg KOH/g respectively) than other samples. Acid index values for heated samples increase progressively with the number of heatings (1.063 ± 0.005 for 1st heating, 1.290 ± 0.010 for 2nd heating and 1.890 ± 0.006 for 3rd heating). The oil’s peroxide value increased with temperature and oxidation (65.6 ± 0.03 for unheated oil vs. 97.9 ± 003 for oil heated to 220˚C). The diet supplemented with this oil resulted in a significant increase in plasma cholesterol levels, and a significant decrease in triglyceride levels. The plasma atherogenicity index reveals the risk of cardiovascular disease associated with this food.
基金The project was successively supported by the National Natural Science Foundation of China(No. 5880104, No. 59543002 and No. 59773030).
文摘The recent developments in the photoinitiated cross-linking of polyethylene and the significant breakthrough of its industrial application are reviewed. The enhanced photo-initiation system, the dynamics of photoinitiated crosslinking, the optimum conditions, the crystal morphological structures and related properties, and the photo- and thermo-oxidation stability of photocrosslinked polyethylene (XLPE) materials have been elucidated systematically. A new technique for producing photocrosslinked XLPE-insulated wire and cable is described in detail. It can be expected that the future applications of photocrosslinking technique of polyolefins will be very promising.
