Synthesis and Antimicrobial Activity of 2,4-Dichlorobenzyl Alcohol

2,4-Dichlorobenzyl alcohol (CAS 1777-82-8), abbreviated as DCBA, is a mild antiseptic capable of killing bacteria and viruses associated with oral and throat infections. It is a common ingredient in throat lozenges (such as Strepsils, Gorpils, and Lorsept) and is also used in the preparation of drugs for treating or preventing HIV infections.

Synthesis Method

2,4-Dichlorobenzyl alcohol can be prepared via electrochemical synthesis through the reduction of 2,4-dichlorobenzaldehyde . The specific procedure is as follows:

Using stainless steel (SS-316) as both the cathode and anode, constant-current electrolysis (1.0 A) is conducted for 6 hours in an H-type electrolytic cell. A water-methanol mixture serves as the solvent, sodium acetate as the supporting electrolyte, and Britton-Robinson buffer is used to control the pH, facilitating the reduction of 2,4-dichlorobenzaldehyde to 2,4-dichlorobenzyl alcohol.

Antimicrobial Activity

2,4-Dichlorobenzyl alcohol is an organic compound with known antibacterial properties. DCBA and amylmetacresol are a combination of mild antibacterial agents used to treat sore throats, mild oral infections and throat irritation. They work by dissolving in the mouth to kill bacteria, relieve pain and alleviate discomfort. Furthermore, they have shown promise as potential antifungal agents. Previous studies have shown that halogenated benzyl alcohol derivatives can disrupt fungal cell membranes and inhibit fungal growth. It exhibits concentration-dependent antifungal activity against the genus Aspergillus (including A. fumigatus, A. niger and A. terreus), with A. terreus being the most sensitive (MIC of 20 μg/mL) and A. fumigatus the least sensitive (MIC of 80 μg/mL). In a fruit fly (D. melanogaster) infection model, at a concentration of 100 μg/mL, the survival rates of fruit flies infected with A. niger and A. fumigatus reached 81.39% and 73.91% respectively, comparable to that of itraconazole (86.67%) [1].

References

[1] Burke WG, Ogaji IJ, Wuyep PA, 2026. Antifungal potentials of 2,4-dichlorobenzyl on Aspergillus species using Drosophila melanogaster (UAS-Diptericin) as a Model. Biochem Biotechnol Res, 13(2): 12-18. https://doi.org/10.5281/zenodo.21356769