容颜不老液的质量标准研究

】容颜不老口服液由生姜、大枣等７味药材组成，采用薄层层析对其主药生姜进行了定性鉴别，并考察了制剂的稳定性。本法简便，特征性强，重现性好，可以作为该制剂的质量控制指标     

反相离子对色谱法研究阴离子的保留行为──流动相中离子强度对阴离子保留行为的影响

研究了反相离子对液相色谱体系中流动相离子强度对杂多酸阴离子、无机酸阴离子、有机磷酸及配阴离子保留行为的影响。从离子相互作用机理出发，以热力学平衡为基础，导出了流动相离子强度影响溶质保留值的两个规律式：ｋ＇－１＝ＡＩ２＋ＢＩ＋Ｃ，ｋ＇－１＝ＡＩ＋Ｃ。在理论上阐述了两者的应用范围，并用实验及文献数据给予验证。结果表明两规律式能很好地描述不同溶质保留值与离子强度的关系。     

榛子脂肪酸组成的比较研究

采用乙醚提取、三氟化硼—甲醇衍生、气相色谱(GC)法分析，对几种榛子油中脂肪酸组成进行比较分析，共鉴别出6种组分，不饱和脂肪酸含量高于饱和脂肪酸含量，不同榛子油中脂肪酸含量略有不同。     

High molecular weight (C35 +) n-alkanes of Neogene heavily biodegraded oil in the Qianmiqiao region, North China

With wax content of 1.62%, heavy oil has been produced from the sandstone reservoirs of Neogene Guantao Formation (Ng1^Ⅲ). In the GC and GC-MS RIC profiles of its aliphatic fraction, n-alkanes are totally lost, which shows the result of heavy biodegradedation. However, the remaining trace C₁₃－C₃₆ n-alkanes can be still seen from its m/z 85 mass chromatogram. In addition, a complete series of C₃₅－C₇₃ high molecular weight (HMW) n-alkanes was detected by high-temperature gas chromatography (HTGC). The HMW n-alkane series shows a normal distribution pattern, a major peak at nC₄₃, obvious odd-carbon-number predominance, CP_I37—55 and OEP_45—49 values up to 1.17 and 1.16—1.20 respectively. The present study not only has conformed the strong resistibility of HMW n-alkanes to biodegradation in crude oils as concluded by previous researchers, but also has provided some significant information on source input and maturity for the heavily biodegraded oil in the Qianmiqiao region.     

Chiral separation of racemic drugs using molecular imprinting

Molecularly imprinted polymers (MIPs) of (S)-ketoprofen and (S)-naproxen are prepared using non-covalent imprinting in the presence of template molecules. The prepared MIPs are used as the chiral stationary phase to separate ramemic naproxen and ketoprofen. The results show that racemic naproxen and ketoprofen are efficiently resolved on MIPs. The effect of concentration of acetic acid in the mobile phase is studied, and the data are analyzed using the affinity chromatography model, and the close agreement is achieved between the simulated and experimental curves. The results suggest that the affinity chromatography mechanism controls the retention in this system. Moreover, the affinity chromatography equilibrium constants on (S)-naproxen and (S)-ketoprofen are estimated.     

嵌段聚酯脲氨酯弹性体的结晶形态

用宽角X-ray衍射(WAXD)研究了嵌段聚酯脲氨酯(PUU)弹性体在不同退火条件下的结晶行为,用扫描电子显微镜(SEM)研究了这些材料断面上的结晶形态。结果表明:PUU中存在着软、硬段结晶,软段结晶对退火温度较敏感,升高退火温度可以增加软段结晶,改善软、硬段两相分离的程度。从SEM照片上看到;在PUU的断面上存在着球晶、棒晶和无定形的连续相,晶体的尺寸和分布依赖于硬段含量和软段分子量的变化。我们认为晶相和硬段无定形相起着物理交联作用,使材料表现出橡胶状的弹性性质。     

红外激光光声光谱检测范围扩展的研究

本文对红外激光光声光谱检测范围扩展进行了研究。测试系统采用了 DNP 色谱柱,设计了可通过试样气流的可加热亥姆霍兹共振光声池,采用了两只光声池串联差分与锁相放大的办法以减小本底噪声。实验对含有乙酸乙酯和乙酸丁酯有机化合物的试样进行了分析,获得了光声色谱图。实验结果表明,当光声池前连色谱柱,即可检测含重分子量有机化合物的混合物,扩大了激光光声光谱的检测范围。     

三氟乙酰氨基酸正丁酯的色谱分离与研究

本文对氨基酸的酯化和酰化条件进行了优选,建立了三氟乙酰正丁酯的气相色谱分离方法;采用毛细管操作系统,提高了氨基酸衍生物的分离度,缩短了分析时间,提高了定量分析的准确度。经食品样品测定,均获得满意的结果。     

一种定性分离L──脯氨酸和L──羟脯氨酸展开剂的选择

为了准确地定性Ｌ－脯氨酸，排除Ｌ－羟脯氨酸的干扰，通过实验确定了正丁醇：乙酸：水＝２：２．４的混合溶剂系统，得到了满意的结果。这对于Ｌ－脯氨酸提取后的定性检验是很方便的。它同时也适用于Ｌ－羟脯氨酸的定性。