The realization of the oriented immobilization of antibodies onto the surfaces of solid or nanometal particles constitutes a significant approach for enhancing the performance of electrochemical immunosensors. In light of the research findings of predecessors, this review showcases several immobilization methods, categorizing them into covalent binding pathways, bioaffinity techniques, and other binding modalities for elaboration. Emphasis is placed on expounding the binding sites, binding mechanisms, as well as the merits and drawbacks of binding techniques such as those involving disulfide bonds, glycan chains, protein A, G, and DNA.

Elaeagnus angustifolia gum offers a good polysaccharide biomass source for producing porous biochar. The incorporation of CoO cracked nanoplate and the biochar gave a promising application in analysis of clinical urine.

Acetaminophen (N-acetyl-p-aminophenol, APAP) is regularly used for antipyretic and analgesic purposes. Overdose or long-term exposure to APAP could lead to liver damage and hepatotoxicity. In this study, the approach of enhanced electrochemical detection of APAP by nanostructured biomass carbon/silver was developed. Porous biomass carbon derived from Elaeagnus Angustifolia gum was prepared by pyrolysis with co-doping of electron-rich elements of nitrogen, sulfur, and phosphorus. The electrodeposition of silver onto a glassy carbon electrode modified with porous carbon could enhance the sensing signal towards APAP. Two linear ranges from 61 nM to 500 μM were achieved with a limit of detection of 33 nM. The developed GCE sensor has good anti-interference, stability, reproducibility, and human urine sample analysis performance. The silver-enhanced biomass carbon GCE sensor extends the application of biomass carbon, and its facile preparation approach could be used in constructing disposable sensing chips in the future.

A novel Zn-doped Fe ₃ O ₄ nanoparticle@N, S and P doped Elaeagnus angustifolia gum derived carbon hybrid electrocatalyst was prepared, characterized and applied for electrochemical sensing of acetaminophen covering urinary physiological concentration.