Fingerprint, i.e., a ridge protrusion on the skin. As the person\’s fingerprint is the interaction of genetic and environmental impacts, and therefore everyone has a fingerprint, but not the same. As the fingerprint repetition rate is extremely small, about one minute 15 billion, it is referred to as \”human identity.\” Latent fingerprint (Latent fingerprints, LFP) due to finger sweat secreted sweat pores covered by the finger so they touch object is formed. Even when thoroughly dry hands, it is likely he will stay in place LFP contact, especially the smooth surface of the object, LFP is the most common crime scene fingerprint type, almost invisible to the naked eye. Therefore, LFP development is critical to solving criminal cases. LFP visualization methods currently used have obvious limitations, such as toxicity, may result in damage to the LFP, less suitable for the scene, and often less than level 3 and high contrast resolution (level 3 microscopic fingerprint details is For more information, including the shape of the hole and the ridge width of the ridge and the edge) of the developing effect. Based on the above issue, Wuhan National Research Center for Optoelectronics Professor Lee Chong with Huazhong University of Science and Technology Professor Zhu Mingjiang cooperation [123 ], developed a new molecule AIE LFP for visualization, and prepared with simple, non-toxic, high resolution (LEVEL 3) and the characteristics suitable for the multi-scene, able to form a clear fingerprint pattern with high contrast and resolution of the within 30 s. Related outcomes to \”Real-Time Fluorescence In Situ Visualization of Latent FingerprintsExceeding Level 3 Details Based on Aggregation-Induced Emission\” was published in \”JACS\” on.
1. Synthesis and Characteristics of TPA-1OH the AIE
2, TPA-1OH mechanism of Visualization and applied to the LFP
, toxicity tests show that no toxicity at 0,10 and 30 uM time, low toxicity at 50μM. Next, in order to verify which component LFP can be identified and combined with TPA-1OH, using a solution mainly composed of LFP, the metal plate wrote the character \”LFP.\” The results indicate that only lipid component written by \”LFPs\” emits strong fluorescence pattern, and clearly visible, shows that the probe does stained lipid compound (FIG. 2b) LFPs in. When contacted with an aqueous solution of TPA-1OH LFPs, lipid molecules adhering to LFPs secretions, which is probably due to the hydrophobic lipid secretion LFPs phase – and hydrophobic interaction lipophilic end TPA-1OH caused . Once the LFPLipid secretion in conjunction with limit intramolecular TPA-1OH molecule can be due to the viscous effect of lipid secretion caused by motion (RIM) and emits strong fluorescence.
3, kinetic studies
real-time show TPA-1OH developing a clear ridges and green lines of high contrast fingerprint image, shows rapid developability .
Imaging level reaches the level 3 (Figure 4b).
5. TPA-1OH applied to high-resolution imaging of LFP
summed In summary, TPA-1OH having hydrophilic – hydrophobic molecular structures which result can be combined with a lipid fingerprint, since the end of the RIM hydrophobic lipid secretions adhering fingerprints formed on a strong red fluorescence. Can be observed within a few seconds to a fingerprint profile, it can be clearly observed fingerprint pattern having a high contrast and resolution within 30 s. It promises to be some obscure and illegible fingerprints indicator to facilitate forensic DNA information extracted suspects. Original link: https: //doi.org/10.1021/jacs.0c00124