磺胺甲(口恶)唑的控温相变免疫分析

将已制备的抗磺胺甲唑(SMX)单克隆抗体(AbSMX)与温度敏感水凝胶(pNIPA)偶联形成水凝胶复合物(pNIPA-AbSMX),用异硫氰基荧光素(FITC)标记的抗原(FITC-AgSMX)和游离半抗原SMX竞争地与有限量的AbSMX和pNIPA-AbSMX反应,根据水凝胶相变温度以上免疫复合物沉淀的特性进行分离,结合抗原抗体免疫反应测定SMX,建立了一种检测SMX的控温相变免疫分析方法。结果表明,SMX浓度在0.1ng/mL~100μg/mL范围内有良好的线性关系,60%抑制率时灵敏度为0.03μg/mL。     

Use of a commercially available hydrogel as a novel DNA surface sampling tool

A common requirement in the military, law enforcement, and forensic mission space is the need to collect trace samples from surfaces using a method that not only readily captures the sample but also retains its integrity for downstream identification and characterization. Additionally, collecting samples from three-dimensional objects (e.g., shell casings) is a challenge for which there is currently no validated standardized approach. Recently, hydrogels have been shown to have the potential for surface collection of trace bacterial spores, amino acids, and DNA. To test whether these hydrogels can serve as a viable collection medium for sampling DNA from surfaces, we carried out a series of preliminary tests examining collection efficiency and suitability of hydrogel material to recover samples of diluted, dried human DNA on a smooth polycarbonate surface. The recovery of surface DNA using a commercially available hydrogel was examined, and the efficiency compared to samples collected using a standard foam collection swab. DNA collected using the hydrogel and swab methods was then examined using quantitative polymerase chain reaction (qPCR) and short tandem repeat (STR) analysis to determine whether the collection material was compatible with these downstream processes. The hydrogel material used for this study collected the experimental DNA with comparable efficiency to standard collection swabs. In addition, qPCR and STR analyses demonstrated compatibility with the hydrogel collection and extraction process. These data suggest that hydrogels have the potential to be used as sample collection materials and deserve further characterization to elucidate their utility in collection from irregularly shaped, three-dimensional surfaces/materials.