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硅胶自环己烷中吸附含氧芳香化合物的研究 总被引:1,自引:0,他引:1
测定了15℃和30℃时硅胶自环己烷中吸附苯甲醇、苯甲醚、苯甲醛和苯甲酸的吸附等温线,这些等温线皆可用Langmuir公式表示。利用Langmuir常数nms和b值计算了吸附过程的△G0、△H0和△S0;四种化合物的△S0皆为正值。测定了在较大复盖度时红外光谱图上硅胶表面自由羟基峰的移动值△vOH。结果表明△H0和△vOH及△vOH1/2间有线性关系。文中对所得结果做了初步的解释。 相似文献
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Protected nonapeptide—Delta Sleep-Induclng Peptide(DSIP)(Boc·Trp·Ala·Gly·Gly·Asp·Ala·Ser·Gly·Glu-OBu~t) has been synthesized by classical method. The product has been treated with TFA and purified on DEAE-Sephadex-A25 coltunn, pure free nonapeptide obtained and a to β transposition of Asp-residue found to be absent. It has been assayed by electrophoresis at pH 3.8, microcrystallinecellulose TLC and HPLC. The physiological activities of synthetic DSIP are performed on rabbits by using intravenous administration or mesodiencephalic ventricular infusion. Its function Of intensifying δ and σ waves on rabbit's electroencephalogram(EEG) is evident. There is no concomitant increase of δ- and σ-enhancing effect following mesodiencephalic ventricular infusion of 10 or 20 times higher than 5 μg/rabbit doses. Results of 6-day consecutive intravenous administration(50μg/kg) indicate that there is no obvious sign of adaptation to DSIP. Results suggest that the physiological function of endogenous sl 相似文献
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