A study on the role of lipids in latent fingermark development using physical developer

초록

The reactive substances and mechanism of physical developer (PD) for developing aged fingerprints on porous surfaces have not yet been clearly identified. This study investigated the role of lipid components in the PD development process using various amino acid and lipid components presumed to be reactive. PD reacted with lipid components alone, but a stronger reaction was observed when a mixture of amino acids and lipid components was used. Among these, the most pronounced reaction occurred when the concentration of an amino acid with a positively charged side chain was fixed, and the concentration of lipid components was varied. As a result, it was observed that the reaction of PD gradually increased with higher concentrations of lipids that protect amino acid components, and the degree of the reaction varied depending on the type of lipid. In water-based PD solutions, lipid components are known to protect amino acids, promoting stronger reactions. However, this experiment confirmed that the extent to which lipid components protect amino acids can influence the outcome of the PD reaction. The PD reaction was not exclusively attributable to specific reactive substances but could be explained as a phenomenon in which lipid components adequately protect amino acids, facilitating the precipitation of silver particles in the PD reaction. Furthermore, it was observed that the reaction intensity and stability of lipid components with PD differed depending on the type of lipid, and these characteristics were found to affect the results of the PD reaction.

키워드