本文利用表面增强拉曼光谱技术(SERS)实现了抗肿瘤药物5-氟尿嘧啶(5-FU)的灵敏检测。通过种子生长法制备不同粒径的银纳米颗粒(Ag NPs), 利用结晶紫(CV)作为探针分子评估基底的增强能力。将优化的Ag NPs作为SERS基底, 结合便携式拉曼光谱仪器, 对不同浓度的5-氟尿嘧啶(5-FU)标准溶液进行检测, 考察其检测限。最终利用标准加入法测定人体血清中5-FU。通过有机相沉淀去除蛋白质, 降低检测干扰。结果表明, 血清中5-FU检测限为3.125 μg/mL。

目的: 选育远端霉素高产菌株。方法: 以远端霉素产生菌(Streptomyces distallicus)D32为出发菌株, 经铜蒸汽激光和5-氟尿嘧啶(5-fu)及其复合处理。结果: 在复合诱变组中获得一株远端霉素高产稳产突变株DZ-206, 经发酵罐应用后, 其产率较出发菌株提高1.38倍。结论: 该方法诱变谱广, 突变率高, 能够快速有效获得抗生素高产菌株。

To study the efficacy and side effects of antitumor drug by the method of Raman spectroscopy, the cancerous (SGC-7901) and normal (GES-1) gastric cells were treated with 0, 25-, 100-, and 200-mg/L 5-fluorouracil (5-Fu) for 24 h, respectively, then Raman spectra of cells were recorded. The excitation wavelength was 514.5 nm and the Raman spectra in the region of 500-1800 cm-1 were recorded. For the gastric cancer cells, as the concentration of 5-Fu increases, the band at 1094 cm-1 attributed to the symmetric stretching vibration mode of PO^(2)_(-) in the DNA backbone gradually decreases, and the intensity ratio of the band at 1315 cm-1 to that at 1340 cm-1 (I1315/I1340) shows the ascending trend, and the ratio of the band area at 1655 cm-1 to that at 1450 cm-1 (A1655/A1450) shows the slight ascending trend. For the normal gastric cells, these peaks also appear changes, however, the changes are weaker than those for the cancer cells. In SGC-7901 cells, 5-Fu can interfere with the DNA synthesis and result in the reduction of the DNA content. Besides, it can affect the unsaturation degree of the hydrocarbon chains and alter the external environment of guanine and adenine residues in cancer cells. The changes of Raman spectra for normal gastric cells reveal the side effect of 5-Fu.

以N1-(2-四氢呋喃烷基)-5-氟尿嘧啶为原料,合成了三种含氨基酸席夫碱的5-氟尿嘧啶类衍生物,用元素分析,1HNMR表征了它们的结构.用拉曼光谱(RS)和表面增强拉曼光谱(SERS)分析了目标化合物的分子振动形式,比较它们在RS和SERS中的异同点.