1887

Abstract

Timely detection of invasive aspergillosis (IA) caused by fungal pathogens, i.e. and , in immunocompromised patients is crucial in preventing high mortality.

To develop a simple immunoassay for the detection of galactomannan (GM), an IA biomarker.

. GM from and clinical strains was purified and characterized by X-ray diffraction, IR spectroscopy and C/H nuclear magnetic resonance (NMR) for polyclonal antibody (pAb) production in rabbits. An enzyme-linked immunosorbent assay (ELISA) was standardized using concanavalin A to capture GM and pAbs to detect it. Gold nanoparticles (AuNPs) were synthesized and conjugated to pAbs for the development of a dot-blot immunoassay. The developed dot-blot was evaluated with 109 clinical serum and bronchoalveolar lavage samples.

. Spectroscopy studies characterized the -galactofuranosyl groups of GM responsible for the immune response and generation of pAbs. The ELISA employing pAbs showed a sensitivity of 1 ng ml for GM. Furthermore, a sensitive, visual, rapid dot-blot assay developed by the conjugation of pAbs to AuNPs (~24±5 nm size, −36±2 mV zeta potential) had a detection limit of 1 pg ml in serum. The pAbs interacted with spp. but did not cross-react with other fungal pathogen genera such as and . Evaluation of the dot-blot with 109 clinical samples showed high sensitivity (80 %) and specificity (93.2 %), with an overall assay accuracy of 89%.

. The developed nano-gold immunodiagnostic assay has immense potential for practical use in rapid, specific and sensitive on-site diagnosis of IA, even under resource-limited settings.

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2019-09-01
2019-09-18
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