Positive control tests for fingermark development reagents

Research progress in techniques for blood fingermark detection

“…有关无机粉末用于显现血指印的最早研究可追 溯至 2003 年. Bergeron [48] 报道过一种二氧化钛和甲醇 制剂, 该制剂无需固定剂, 可作为检测深色基质表面 指印的补充试剂, 能够显现出白色的三级纹线细节, 且不造成背景污染. 此后, 纳米二氧化钛作为一种新 型小颗粒试剂曾多次被举荐为深色表面改善血指印 细节特征清晰度和对比度的有效方法 [49,50] . 然而, 有 研究 [51] 指出纳米二氧化钛颗粒可能会损耗指印中回 收的 DNA 数量, 不利于后续的遗传物质分析.…”

Interpol review of fingermarks and other body impressions (2019 – 2022)

“…Other sections – The following papers are detailed in other sections of this report: use of IND/Zn to emphasize grabbing areas on fabrics [ 239 ] – See Section 4.4.3 ; performance of amino acids reagents to detect fingermarks on different kinds of gloves [ 240 ] – See Section 4.4.6 ; impact of ethanol on the quality and recovery of fingermarks by amino acid reagents and ORO [ 241 ] – See Section 4.5.3 ; design and assessment of positive control tests for amino acid reagents [ [242] , [243] , [244] ] – See Section 4.6.1 .…”

“…Quality control – Four papers referred to the design or assessment of positive control tests for amino acid reagents [ [242] , [243] , [244] ] or MS-based techniques [ 226 ]. These studies are briefly described here-below, and the most relevant observations/conclusions cited: Janssen-Bouwmeester et al’s control test aimed at assessing if a questioned solution is performant enough to reach the lower LOD determined experimentally [ 242 ]. The control tests were printed using a chemical printer and an aqueous solution containing 14 amino acids at a pre-determined concentration (i.e., 0.50 mg/L for IND/Zn and 50.0 mg/L for NIN).…”

“…Janssen-Bouwmeester et al’s control test aimed at assessing if a questioned solution is performant enough to reach the lower LOD determined experimentally [ 242 ]. The control tests were printed using a chemical printer and an aqueous solution containing 14 amino acids at a pre-determined concentration (i.e., 0.50 mg/L for IND/Zn and 50.0 mg/L for NIN).…”