Abstract
Background: Benzimidazoles are important heterocyclic compounds having significant
attention in the pharmacological industry due to their various biological and dying properties.
Objective: 3-(1H-benzo[d]imidazol-2-yl)-2-chloroquinoline, a heterocyclic dye (1), was prepared
using o-phenylenediamine and 2-chloroquinoline-3-carbaldehyde in the presence of ceric
ammonium nitrate catalyst and hydrogen peroxide under reflux condition, which was subjected to
mordant and disperse dyeing study and antimicrobial activity to develop antimicrobial textile
garment products.
Methods: Elemental analysis, NMR, FT-IR, Mass and UV-visible spectroscopic techniques were
used to characterize dye (1). Polyester, wool and silk textile fabrics were selected for the
evaluation of dyeing assessment of dispersed heterocyclic dye. The in vitro antimicrobial screening
was done against Mycobacterium tuberculosis H37Rv, Streptococcus pyogenes, Staphylococcus
aureus, Pseudomonas aeruginosa, Escherichia coli, Candida albicans, Aspergillus niger and
Aspergillus clavatus strains using standard drugs as reference.
Results: The deep brown to green shades were observed for dye (1), particularly on polyester
samples and showed excellent wash fastness and light fastness properties. Dye (1) was active
against Staphylococcus aureus showing 100 μgmL-1 MIC with 16.5 mm ZOI better than the
reference drug ampicillin. It was more active against Candida albicans with 12.5, μgmL-1 MIC
with 33 mm ZOI in compared to nystatin reference drug during antifungal screening. In primary
screening, the MIC value for antimycobacterial activity was <12.5 μgmL-1.
Conclusion: The characteristics values of spectroscopic data support the chemical structure of dye
(1). It may become the potent applicant for the production of antimicrobial textile garment products
like socks, stockings, caps, etc. due to its fastness, lightning and antimicrobial activity results.
Keywords:
Antimicrobial activity, benzimidazole, dyeing property, fastness properties, mordant textile dyeing, fluorescent.
Graphical Abstract
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