The Key to Humic Acid Activity: Functional Groups

June 29

07:30 2026

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Summary:

The humic acid market contains products with significant differences in quality and price. The true value of high-quality humic acid lies in its high biological activity. The activity of humic acid molecules is largely determined by their functional groups. Through its proprietary MRT (Molecular Reorganization Technology), CityMax Group precisely modifies the number, type, and distribution of functional groups within humic acid molecules, resulting in enhanced activity and stronger biostimulant performance.

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Humic acid derived from mineral sources is extracted from young lignite or weathered coal. It is a complex macromolecular organic substance consisting of aromatic ring structures and aliphatic chains. Attached to this molecular framework are numerous oxygen-, nitrogen-, and sulfur-containing functional groups, which determine the molecule’s acidity, chelating ability, ion-exchange capacity, redox activity, water solubility, and stability.

The market offers humic acid products with varying quality levels and price points, often displaying substantial differences in biological performance. The primary reason for these variations is the difference in the types, quantities, and distribution of functional groups present within the humic acid molecules.

During the extraction and processing of CityMax Group’s high-activity humic acid, MRT Molecular Reorganization Technology is applied to precisely modify the position, type, and quantity of active functional groups. This significantly improves water solubility, physiological stimulation effects, hard-water tolerance, and crop-regulating capabilities. Therefore, our humic acid products deliver excellent effects on root growth & nourishment, physiological regulation, growth stimulation and stress resistance.

MAX HumiBuild is a high-activity humic acid granular product specifically developed for soil improvement and is intended exclusively for soil application. The product features uniform round granules with a diameter of 2–4 mm, ensuring easy and even distribution in the soil. With a high humic acid content, it effectively improves soil aggregate structure, enhances water and nutrient retention capacity, stimulates beneficial soil microbial activity, and creates an optimal environment for root growth. The product is pH-neutral, helping to mitigate soil alkalinity issues while promoting nutrient availability, ultimately supporting healthy crop growth, stable yields, and improved productivity.

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