Al2O3/SnO2 co-nanoparticles were prepared with a modified sol-gel technique followed by a thermal treatment process. With these co-nanoparticles the grafted collagen-Al2O3/SnO2 nanocomposites were obtained using a supersonic dispersion method. X-ray diffraction, FT-IR analysis, transmission electron microscopy, TGA/DTA and infrared emissivity test were performed to characterize the resulting nanoparticles and nanocomposites, respectively. The Al2O3/SnO2 co-nanoparticles showed a narrow distribution of size between 20-40 nm and could be uniformly absorbed on the tri-helix scaffolds of the grafted collagen without any aggregation. The nanocomposites possessed better thermal stability and substantially lower infrared emissivity than the grafted collagen and Al2O3/SnO2 co-nanoparticles with an increase of degradation temperature from 39 to 210 ℃ and a decrease of infrared emissivity from 0.850 of the grafted collagen and 0.708 of the Al2O3/SnO2 co-nanoparticles to 0.424, which provided a potential application of the nanocomposites to areas such as photoelectronics.
The effects of enteral nutrition containing long chain triglycerides （LCT） and medium chain triglycerides （MCT） or L-arginine （Arg） on fat absorbability, serum free fatty acid profiles and intestinal morphology in rats with short-bowel syndrome （SBS） were studied using gas chromatography. Twenty-eight Sprague-Dawley rats were randomly assigned to 4 groups： sham operation fed with LCT as control; 85% small bowel resection fed with LCT, MCT/LCT, and Arg/LCT, respectively. SBS rats showed a decrease of fat absorptivity. Enteral nutrition supplemented with MCT could increase fat absorptivity. L-Arginine enhanced enteral nutrition was associated with the elevation of fat absorptivity, possibly due to its enterotrophic effect on remnant small bowel mucosa. LCT group showed a significant deficiency of total free fatty acid and the decreased essential fatty acid content, which was improved in other two SBS groups.
