Bioinspired iron(ii)-tannate microstructures for fungal disease control in crops

Overview

Iron(II)-tannate microstructures represent a bioinspired, naturally derived antifungal compound designed to control fungal disease in grain crops such as rice, corn, and wheat. By coordinating tannic acid, a low-cost and abundant natural material rich in pyrogallol and catechol structural units, with iron(II), which contributes redox properties, the resulting microstructures exhibit antimicrobial activity against plant pathogens. Preliminary studies have shown that treated fungus-infected corn plants produced new, uninfected leaves within two weeks of application, and treated seawater samples showed no bacterial growth. Beyond disease control, the microstructures are biodegradable, offering the added benefit of soil nourishment.

Technical specifications

Key features:

• Novel mode of action: Iron(II)-tannate coordination microstructures provide a new mechanism for combating fungal infections, distinct from conventional fungicides
• Naturally derived composition: Built from tannic acid and iron(II), both abundant and low-cost raw materials
• Dual antimicrobial activity: Demonstrated antibacterial effects in seawater and antifungal effects in corn plant trials
• Biodegradable: Microstructures break down in soil, contributing to soil health rather than accumulating as pollutants
• Versatile application: Can be formulated as a spray suspension for foliar and soil treatment

How it works:

Tannic acid's pyrogallol and catechol functional groups deliver antioxidant and antimicrobial properties. When coordinated with iron(II), the resulting microstructures leverage redox chemistry to inhibit fungal and bacterial growth. The compound is applied as a suspension spray onto infected plant leaves and soil.

Technology readiness level

The technology is currently at an early validation stage. Initial proof-of-concept studies have demonstrated antibacterial activity in seawater samples and antifungal efficacy in corn plants over a two-week observation period. Future validation efforts are planned to systematically assess antifungal performance against Fusarium species in rice, corn, and wheat over a full six-month growing cycle, as well as to optimize active ingredient concentration for effective formulation. Further development is needed to establish field-scale efficacy, formulation stability, and commercial readiness.