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A new method for the determination of DNA was developed with azocarmine G(AG) in the presence of cetyltrimethylammonium bromide(CTAB) by the resonance light scattering (RLS) technique. The synthetic samples were determined with satisfactory results, and the reaction mechanism was also studied. The results show that under the optimum conditions, the weak RLS signal of AG can be enhanced by DNA, which results from the formation of a new ternary complex AG-CTAB-DNA with large size. Moreover, the enhanced RLS intensity at 552 nm is directly proportional to the concentration of DNA in the range of 0 - 1.0 μg/mL for fish sperm DNA (fsDNA) and 0 - 1.5μg/mL for calf thymus DNA (ctDNA). Based on this, a new assay of DNA can be established. The detection limits (3σ) are 2. 1 ng/mL for fsDNA and 2.2 ng/mL for ctDNA, respectively. 相似文献
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新试剂4,4′-二(8-羟基喹啉-5-偶氮)-3,3′-二甲基联苯(D-HQADMB)的合成方法,研究了其分析特性及其与铜(Ⅱ)的显色反应。结果表明,D-HQADMB 在不同条件下能与多种金属离子呈灵敏显色反应。Cu(Ⅱ)-D-HQADMB-Triton X-100体系在 pH1.5~5.0范围内形成 Cu(Ⅱ):D-HQADMB 为1:1的红紫色络合物,λ_(max)位于535nm,△λ=120nm,ε_(535)=6.02x10~4。铜量在0~10μg/10mL 范围内符合比尔定律。用萃取光度法测定了铝合金中的微量铜,结果满意。 相似文献
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