Wide dynamic range of surface-plasmon-resonance-based assay for hepatitis B surface antigen antibody optimal detection in comparison with ELISA

Yew Joon Tam, Nazariah Allaudin Zeenathul, Morvarid Akhavan Rezaei, Nor Hidayah Mustafa, Mohd Lila Mohd Azmi, Abdul Rani Bahaman, Sewn Cen Lo, Joo Shun Tan, Homayoun Hani, Abdullah Rasedee

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14 Citations (Scopus)

Abstract

Limit of detection (LOD), limit of quantification, and the dynamic range of detection of hepatitis B surface antigen antibody (anti-HBs) using a surface plasmon resonance (SPR) chip-based approach with Pichia pastoris-derived recombinant hepatitis B surface antigen (HBsAg) as recognition element were established through the scouting for optimal conditions for the improvement of immobilization efficiency and in the use of optimal regeneration buffer. Recombinant HBsAg was immobilized onto the sensor surface of a CM5 chip at a concentration of 150 mg/L in sodium acetate buffer at pH 4 with added 0.6% Triton X-100. A regeneration solution of 20 mM HCl was optimally found to effectively unbind analytes from the ligand, thus allowing for multiple screening cycles. A dynamic range of detection of ∼0.00098–0.25 mg/L was obtained, and a sevenfold higher LOD, as well as a twofold increase in coefficient of variance of the replicated results, was shown as compared with enzyme-linked immunosorbent assay (ELISA). Evaluation of the assay for specificity showed no cross-reactivity with other antibodies tested. The ability of SPR chip-based assay and ELISA to detect anti-HBs in human serum was comparable, indicating that the SPR chip-based assay with its multiple screening capacity has greater advantage over ELISA.

Original languageEnglish
Pages (from-to)735-744
Number of pages10
JournalBiotechnology and Applied Biochemistry
Volume64
Issue number5
DOIs
Publication statusPublished - Sep 2017
Externally publishedYes

Keywords

  • anti-HBs
  • chip-based detection assay
  • hepatitis B surface antigen
  • Pichia pastoris
  • surface plasmon resonance

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