What Are Nanozymes?

Intro

For decades, natural protein enzymes have been essential catalysts across biology, agriculture and medical industries, yet their inherent flaws—poor stability under extreme temperature or pH levels and expensive large-scale production—have long restricted broader application. It was not until 2007 that a groundbreaking discovery from Chinese Academy of Sciences researchers Professor Yan Xiyun and Dr. Gao Lizeng rewrote the rules of artificial enzyme research: inorganic nanomaterials could naturally behave like enzymes without extra organic modification. This revolutionary substance was named the nanozyme, opening an entirely new interdisciplinary research field blending nanoscience, chemistry and agronomy.

1. The Birth & Core Definition of Nanozymes

Prior to 2007, scientists widely regarded inorganic nanoparticles as biologically inert materials with no intrinsic catalytic capability. Any catalytic performance required attaching organic enzyme molecules onto nanoparticle surfaces.

Yan and Gao’s team overturned this consensus after rigorous repeated verification: ferric oxide (Fe₃O₄) nanoparticles themselves possess inherent peroxidase-like catalytic activity identical to horseradish peroxidase (HRP), a commonly used natural biological enzyme.

In short, nanozymes are inorganic nanoscale materials with innate enzyme-mimicking catalytic properties. Their catalytic capacity originates from unique microscopic nanostructures instead of biological protein compositions, the core theory first confirmed and systematically summarized in the landmark research published by the CAS team. Besides structural advantages, nanozyme activity is adjustable via particle size, morphology and surface modification: smaller particle size generally delivers stronger catalytic efficiency under identical weight conditions.

A standout trait of classic iron oxide nanozymes is pH-dependent dual catalytic functions: they work as peroxidase catalysts in acidic environments while switching to catalase activity under neutral conditions, decomposing hydrogen peroxide into water and oxygen.

2. Nanozymes vs. Natural Enzymes & Traditional Artificial Enzyme Mimics

Three types of catalytic materials differ sharply in practical performance, making nanozymes uniquely competitive for industrial and agricultural use:

• Natural protein enzymes: High substrate specificity but easily denatured by high temperature, acid or alkali; difficult to mass-produce and costly for large-scale commercial use.
• Conventional organic artificial mimics: Built from organic compounds such as cyclodextrin and crown ether, with low catalytic efficiency and limited industrial scalability.
• Nanozymes: Combine high catalytic efficiency comparable to natural enzymes and excellent stability of inorganic materials. Most retain over 80% catalytic activity even at 80℃ or extreme pH values, alongside affordable bulk manufacturing and customizable catalytic functions.

3. Three Main Categories of Mature Nanozymes

Based on core chemical composition summarized from global research data, mainstream commercial and lab-developed nanozymes fall into three major families:

1.Iron-based nanozymes: The earliest discovered and most widely researched type, including iron oxide, iron sulfide and iron-manganese composite oxide nanoparticles.

2.Non-ferrous metal nanozymes: Cover cerium oxide, manganese dioxide, copper oxide and precious metal (gold, platinum) nano-structured particles with diversified catalytic effects.

3.Non-metal carbon-based nanozymes: Made of graphene oxide, carbon nanotubes and carbon dots, favored for eco-friendly, low-cost industrial applications.

4. Wide-Ranging Real-World Applications of Nanozyme Technology

Originating from lab basic research, nanozyme technology has expanded into multiple mature commercial sectors, with agricultural application becoming one of its fastest-growing directions:

Medical & biosensing

Nanozymes replace expensive natural HRP in immune testing, tumor tissue targeted detection and blood glucose/uric acid inspection. Magnetic iron oxide nanozymes enable label-free in vivo biological tracking, greatly simplifying preclinical experiment workflows.

Environmental protection

Nanozymes efficiently degrade toxic phenol pollutants in wastewater and detect trace harmful substances such as acid rain peroxides and organophosphorus pesticides, featuring recyclable use and low secondary pollution.

Modern agriculture (fast-growing commercial field)

Building on core nanozyme catalytic mechanisms, researchers have developed two mainstream agricultural nanozyme formulations for crop planting:

Molybdenum-based nitrogen-fixing nanozyme: Acts as a natural nitrogen fixation catalyst that captures atmospheric nitrogen and fixes it into farmland soil for crop absorption. Verified field trials prove it can cut nitrogen fertilizer usage by roughly 30%, lowering high energy consumption from synthetic nitrogen fertilizer production and easing fertilizer cost burdens for developing-world growers.

Silicon-based biostimulant-type nanozyme: Optimizes crops’ nutrient uptake efficiency. Test data from China’s Henan Academy of Agricultural Sciences shows staple grains like rice and wheat achieve 8%–18% yield growth, while high-value fruits and vegetables gain a striking 30%–80% output increase after application.