新しいナノキャリア、降雨後も葉面に鉄を保持するのに役立つ可能性（New Nanocarrier Could Help Keep Iron on Leaves After Rainfall）

2026-09-04 合肥物質科学研究院（HFIPS）

Schematic illustration of NECT construction and rainfast foliar iron delivery. (Image by TENG Guopeng)

＜関連情報＞

• https://english.hf.cas.cn/nr/bth/202609/t20260904_1192607.html
• https://www.sciencedirect.com/science/article/pii/S0008622326007943

カーボンナノドットで安定化され、配位制御されたナノキャリアにより、雨に強い葉面散布鉄供給が可能になる Carbon dot-stabilized and coordination-gated nanocarriers enable rainfast foliar iron delivery

Guopeng Teng, Bowen Shen, Xue Yuan, Chunhui Zhou, Chengye Wang, Meng Gao, Yunhao Zhang, Bo Hu, Jia Zhang, Zhengyan Wu
Carbon  Available online: 29 August 2026
DOI:https://doi.org/10.1016/j.carbon.2026.122020

Highlights

• Carbon dots stabilize ferrous iron through coordination and radical attenuation.
• A tannic acid-iron shell gates pH-dependent nutrient transport.
• Component controls resolve carbon-dot protection and shell-gated transport.
• The carrier retains 72% of pre-rain total iron after simulated rainfall.
• Controlled tests link the carrier to improved foliar iron nutrition in rice.

Abstract

Foliar iron delivery requires simultaneous control of ferrous-state stability, nutrient transport, and leaf-surface residence, yet these functions are rarely integrated within a single formulation. Here, we developed a carbon dot-stabilized and coordination-gated nanocarrier formulation (NFCT) by co-confining Fe²⁺ and carbon dots (CDs) within amino-functionalized mesoporous silica and depositing an external tannic acid-Fe (TA-Fe) coordination network. Electron spin resonance measurements and density functional theory calculations support complementary contributions of the CDs to reactive-oxygen-species attenuation and Fe²⁺ coordination, whereas the outer metal-phenolic network provides pH-dependent regulation of nutrient transport. Under the tested storage conditions, NFCT retained 93.0% of recoverable Fe²⁺ after 7 d and showed substantially greater recoverable Fe²⁺ availability under mildly acidic than near-neutral or alkaline conditions. On model waxy leaf surfaces, NFCT improved droplet spreading and achieved 72% of the pre-rain total-Fe deposit after a 70.7 mm simulated-rainfall challenge. These redox, transport, and interfacial attributes were associated with greater foliar Fe accumulation, chlorophyll index, biomass production, and root-system remodeling in Fe-deficient rice. In a single-site, single-season proof-of-concept field trial, no statistically significant differences were detected between NFCT and commercial EDTA-Fe for the measured agronomic traits under the tested application program. The results define a carbon-dot-centered structure-property-function framework in which internal Fe²⁺ protection, external coordination-gated transport, and rainfast foliar residence provide complementary delivery functions.