A method for molecularly imprinted SPE of the melamine from environmental water samples was investigated. Cyromazine-imprinted polymers were synthesized in water-methanol systems for the selective extraction of melamine from aqueous samples, followed by HPLC analysis. Molecular recognition properties and binding capability to melamine were evaluated by adsorption test and Scatchard analysis, which showed the dissociation constant (KD) and the maximum binding quantity (Qmax) were 0.032 micromol/L and 4.77 micromol/g for high affinity binding site, and 0.26 micromol/L and 19.10 micromol/g for lower affinity binding site, respectively. Under the optimum extraction protocol, the method can be successfully applied to selectively extract and enrich melamine in environmental water. The linearity was ranged from 0.500 to 100.0 ng/mL (r > 0.999) in tap water, lake water, and seawater analysis. When 50 mL of the water samples loaded, the LODs of the method were ca. 0.1 ng/mL, and the LOQs were ca. 0.5 ng/mL. The mean recoveries of melamine from blank water samples spiked at 0.5, 5.0, and 50 ng/mL were more than 86.3%, with the RSD less than 8.8%.
Mangiferin ameliorated the progression of AH by regulating the metabolic network associated with damage-associated molecular patterns, lipid metabolic disorder and mitochondrial dysfunction in AH rats.
To further improve the ablation and thermal properties of silicon rubber composite materials, the 3, 13-divinyloctaphenyl double-decker polyhedral oligomeric silsesquioxane (DV-DDSQ) modified additional vinyl-terminated polydimethylsiloxane (VPDMS) was prepared, and the effect of high silica fiber reinforcement on the ablation properties of VPDMS was investigated. The results show that when 0.8phr DV-DDSQ was added, the mass residual rate at 800 C of the composites increased from 40.6% to 51.0%. The linear ablation rate (LAR) as well as mass ablation rate (MAR) of the composites of the DV-DDSQ modified VPDMS, the high silica fiber reinforced VPDMS composite (HSF/VPDMS composite) and the high silica fiber reinforced DV-DDSQ modified VPDMS composite (HSF/DV-DDSQ-VPDMS composite) decreased dramatically compared with raw VPDMS, and it was 16.36%, 35.69%, and 37.17% bring down for LAR and 5.34%, 14.60% and 25.59% for MAR, respectively. The tensile strength and hardness of the DV-DDSQ modified composites increased by 9.52% and 14.13%, respectively, while the elongation at break decreased by 5.99%, compared with the raw VPDMS.
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