Cellulose-Based Photothermal Coating: A Sustainable Solution for Seed Protection and Long-Term Grain Storage

Area of Science:

• Agricultural Science
• Materials Science
• Biotechnology

Background:

• Modern agriculture heavily relies on synthetic chemicals (pesticides, fertilizers), raising concerns about overuse and environmental impact.
• Sustainable alternatives are crucial to prevent food crises and reduce chemical dependency in agriculture.

Purpose of the Study:

• To develop a green, versatile strategy for seed protection and long-term grain storage.
• To create a cellulose-based photothermal coating capable of eradicating seed-borne pathogens.

Main Methods:

• A coating composed of photothermal polydopamine nanoparticles (PDA NPs) and a positively charged cellulose derivative (Cell-N+) was synthesized.
• The coating (PDA NPs@Cell-N+) was applied to seeds and irradiated with infrared light to assess its efficacy against seed-borne bacteria and fungi.
• In vitro and in vivo assays, along with seedling-stage phenotype analysis of mung beans (Vigna radiata), were conducted.

Main Results:

• The PDA NPs@Cell-N+ coating efficiently eliminated pathogenic microbes, including Aspergillus flavus, with an inhibition ratio exceeding 99%.
• Seed-borne diseases in mung beans were effectively prevented through this photothermal therapy.
• The coating demonstrated excellent solubility and biocompatibility, allowing for recycling without food safety concerns.

Conclusions:

• PDA NPs@Cell-N+ presents a nature-based, sustainable solution for seed protection and long-term grain storage.
• This photothermal coating technology offers an effective alternative to conventional chemical treatments for agricultural applications.
• The study highlights the potential of green nanotechnology in enhancing food security and safety.