Chromafil pet 45 25

The dye was extracted from both warp and weft textile samples (~0.002 g, fragments and original textile) using a solution of 5% Formic acid/MeOH at 100 °C for 10 min. Then, the solution was filtered (Chromafil PET-45/25, Macherey-Nagel, Düren, Germany) and a volume of 250 μL of the mixture MeOH; DMF (1:1, v/v) was added to the dry residue, then heated for 5 min at 100 °C. The extract obtained was used for UV-Vis i HPLC analysis.

The standard stock solutions of explosives,
as well as military-purpose mixed explosives (Comp B and Octol), were
prepared in extra pure acetone (Sigma-Aldrich). The monomer solution
of carbazole was prepared in extra pure acetonitrile (AcCN). Gold
(III) chloride solution (HAuCl₄ of 99.99% purity on trace
metals basis, containing ≤150.0 ppm trace metals, 30% by wt
in dilute HCl) was utilized for AuNP modification of the PBE memory-GC/PCz
working electrode surface, and the 0.04% (w/v) working solution was
prepared from this stock solution. The stock solutions of camouflage
materials (caffeine, paracetamol, aspartame, acetylsalicylic acid,
detergent, and d-glucose) at a concentration of 1000 mg L^–1 were prepared in acetone and filtered through Chromafil
PET-45/25 (a 0.45 μm filter) (Macherey-Nagel) before measurements.