Buking Supatana, Saetear Phoonthawee, Tiyapongpattana Warawut, Uraisin Kanchana, Wilairat Prapin, Nacapricha Duangjai, Ratanawimarnwong Nuanlaor
Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs).
Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Mahidol University.
Anal Sci. 2018;34(1):83-89. doi: 10.2116/analsci.34.83.
A low-cost and user-friendly microfluidic paper-based analytical device (μPAD) was developed for identification of bullet hole from gunshot residue (GSR) on cotton fabric target. The device (25 × 82 mm) is made of filter paper with a printed pattern consisting of a circular sample loading reservoir (6 mm i.d.), a circular waste reservoir (4 mm i.d.) and a straight flow channel (3 mm wide and 60 mm long). A sticker with a ruler scale in millimeters was mounted alongside the channel. The straight channel is first impregnated with rhodizonate and dried at ambient temperature. Tartrate extract of the target fabric is loaded on the sample reservoir. If Pb(II) ions are present in the extract, pink streak of Pb(II)-rhodizonate precipitate is formed as the sample solution flows from the reservoir along the channel. The length of the pink strip is employed to estimate the firing distance.
开发了一种低成本且用户友好的基于微流控纸的分析装置（μPAD），用于识别棉织物靶标上枪伤残留物（GSR）中的弹孔。该装置（25×82毫米）由滤纸制成，带有印刷图案，包括一个圆形样品加载池（内径6毫米）、一个圆形废液池（内径4毫米）和一个直的流动通道（宽3毫米，长60毫米）。一个带有毫米刻度尺的贴纸安装在通道旁边。直通道首先用连二硫酸盐浸渍并在室温下干燥。将靶标织物的酒石酸盐提取物加载到样品池中。如果提取物中存在Pb（II）离子，当样品溶液从池中沿通道流动时，会形成Pb（II）-连二硫酸盐沉淀的粉红色条纹。粉红色条带的长度用于估计射击距离。
