Insects as Nanofactories: Scientists Harness Bugs to Build Designer Nanocarbons

In a first-of-its-kind breakthrough, scientists from Nagoya University and RIKEN have demonstrated that insects can be used as living nanofactories to build complex oxygen-doped molecular nanocarbons—materials with wide-ranging potential in electronics, sensors, and optoelectronics.

The insect of choice? The humble tobacco cutworm (Spodoptera litura), a pest-turned-laboratory chemist.

How It Works

Researchers fed carbon nanorings called [6]MCPP and [6]CPP to S. litura larvae. The larvae’s detoxification enzymes—particularly cytochrome P450s (CYPs)—oxidized the carbon nanostructures, inserting oxygen atoms into specific bonds.

The reaction yielded oxygen-doped derivatives like [6]MCPP-oxylene and [6]CPP-oxylene
These modified nanocarbons showed novel fluorescence and altered electronic properties
The structural changes were confirmed using X-ray crystallography and NMR spectroscopy

Remarkably, only the [6]-membered carbon rings were modified—showing selective reactivity and molecular recognition within the insect’s biochemistry.

Why It’s Revolutionary

Unlike traditional organic synthesis or microbial biotransformations, this “in-insect synthesis” uses an entire living organism as a one-pot biosynthetic reactor:

No external enzymes or harsh reagents required
High selectivity and yield (up to 10% isolated)
Enables oxygen insertion into C–C bonds, a challenging task in organic chemistry
Works with non-natural substrates like carbon nanobelts and nanorings

This opens the door for green nanomaterials manufacturing using biological systems.

Key Discoveries

Enzymatic Origin: CYP450 isoforms X2 and X3 were identified as key enzymes via RNAi knockdowns and E. coli reconstitution.
Mechanism Verified: Molecular dynamics and DFT simulations confirmed oxygen insertion mechanisms, favoring direct C–C bond attack.
Optoelectronic Properties: The oxidized products displayed new absorption and fluorescence features—a step toward functional nano-optoelectronic devices.

Applications Ahead

Next-gen fluorescent materials
Biocompatible electronics
Photovoltaic devices and chemical sensors
Eco-friendly nanocarbon processing

Reference

Usami, A., Kono, H., Austen, V., Phung, Q. M., Shudo, H., Kato, T., … & Itami, K. (2025). In-insect synthesis of oxygen-doped molecular nanocarbons. Science, 388(6751), 1055-1061. DOI: 10.1126/science.adp9384