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Silica gel 100 200 mesh

Manufactured by Merck Group
Sourced in Germany

Silica gel 100–200 mesh is an inorganic, porous, and amorphous material composed of silicon dioxide. It is characterized by a particle size range of 100 to 200 mesh, which corresponds to a particle diameter of approximately 75 to 150 micrometers. This material is commonly used as a desiccant, adsorbent, and chromatographic support in various laboratory and industrial applications.

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3 protocols using silica gel 100 200 mesh

1

Analytical Extraction of PCB Congeners

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Analytical grade hexane, acetone, dichloromethane, petroleum ether, and acetonitrile were purchased from Merck (Germany). They were distilled over a 0.5-m packed column (reflux ratio approximately 1:25).10 Solvent purity was tested by gas chromatographic analyses. Anhydrous granulated sodium sulfate and silica gel 100–200 mesh (Merck, Germany) were cleaned with pure n-hexane by distillation. The external and internal standard were purchased from Restek (USA) and constituted of 1000 μg/ml of the following PCB congeners: #8, #18, #28, #44, #52, #60, #77, #81, #101, #105, #114, #118, #123, #126, #128, #138, #153, #156, #157, #167, #169, #170, #180, #185, #189, #195, and #206.
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2

Purification and Characterization of Organochlorine Compounds

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All solvents of analytical grade (hexane, acetone, dichloromethane, petroleum spirit, and acetonitrile) were purchased from Merck, Germany, and distilled over 0.5 m packed column (reflux ratio approximately 1:25). The solvent purity was tested by gas chromatographic analyses. Anhydrous granulated sodium sulfate and silica gel 100-200 mesh (Merck, Germany) were cleaned with pure n-hexane by distillation. The external and internal standard were purchased from Restek USA and composed of 1000 µg/ml of the following 20 organochlorine compounds: α-HCH, β-HCH, γ-HCH, δ-HCH, endrin, endrin aldehyde, endrin ketone, heptachlor, heptachlor epoxide, aldrin, dieldrin, endosulfan I, endosulfan II, endosulfan sulfate, methoxychlor, α-chlordane, γ-chlordane, DDE, DDT, and DDT.
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3

Synthesis of Proline-Based Heterocyclic Compounds

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A mixture of solid support proline–proline dipeptide (30 mol%), Vanillylacetone (1 mmol; Sigma Aldrich, St. Louis, MI, USA), and thiophene 3-carbaldehyde (1.2 mmol; Sigma Aldrich, USA) in anhydrous DMF (5 cm3; Sigma Aldrich, USA) under inert conditions (nitrogen gas) was stirred at 80 °C for 8 h. The reaction progress was monitored using thin-layer chromatography (TLC, Silica gel 60 F254, Merck, St. Louis, MI, USA). After the reaction, the mixture was diluted with cold water and filtered to separate the catalyst. The reaction mixture was then extracted with diethyl ether and removed under reduced pressure. The residue was separated using column chromatography (Silica gel 100–200 mesh, Merck, Rahway, NJ, USA) with a hexane–ethyl acetate mixture to afford pure compounds. The filtered catalyst was reused after drying. All the solvents and reagents were of analytical grade and obtained from Merck. The STCs were characterised using 1H, 13C nuclear magnetic resonance (NMR; JOEL 400 MHz) and CHN analysis (Thermo Scientific, Waltham, MA, USA). The synthetic scheme is shown in Figure 2.
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