A New Choice for Plant Nutrition Beyond Free Amino Acids

August 10

15:57 2026

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Both free amino acids and peptides serve as directly available organic nitrogen sources for plants, yet they differ significantly in structure, absorption, function, and effectiveness. Peptides, with their independent transport systems, high-efficiency absorption at low concentrations, and signal regulatory functions, offer distinct advantages over free amino acids in promoting growth, enhancing stress resistance, and improving crop quality.

Ⅰ.Absorption and Utilization Efficiency

1.1 Absorption Mechanism

Free amino acids are absorbed via amino acid transporters, with competition existing among different amino acids. High-affinity amino acids inhibit the uptake of others, thereby reducing overall efficiency. Peptides, on the other hand, possess independent transport systems (such as the Pep transporter family), which do not interfere with amino acid transport, enabling efficient absorption even at low concentrations.

1.2 Assimilation Pathway

After plants absorb free amino acids, energy is required to assemble them into polypeptide chains and fold them into proteins—a process dependent on ATP and constrained by intracellular amino acid pool balance. In contrast, peptides can directly serve as protein synthesis modules, bypassing the assembly step, thus requiring less energy, enabling faster assimilation, and exhibiting rapid absorption and resistance to saturation.

Ⅱ.Physiological Functions and Regulatory Effects

2.1 Functional Levels

The primary function of free amino acids lies in basic nutritional supplementation, with effects mainly focused on nitrogen metabolism. Peptides, however, offer both nutritional supply and regulatory functions. Specific small-molecule peptides can act as signaling molecules, binding to cell membrane receptors to regulate gene expression, enzyme activity, and metabolic flux.

2.2 Stress Resistance Effects

Under abiotic stresses such as low temperature, drought, high temperature, or salinity, peptides generally exhibit superior stress tolerance compared to free amino acids. This stems from their dual mechanisms: nutritionally, they compensate for reduced root capacity to absorb inorganic nitrogen; regulation-wise, they activate defense systems, promote accumulation of osmoprotectants, enhance antioxidant enzyme activity, and improve membrane stability. Free amino acids primarily provide nutritional support but lack systematic regulatory capabilities.

2.3 Component Diversity

Free amino acid products consist mainly of amino acids, resulting in relatively limited functionality. High-quality peptide products (e.g., enzymatically hydrolyzed fish protein) retain additional components such as unsaturated fatty acids, nucleotides, vitamins, and trace active factors, whose synergistic interactions further enhance efficacy.

Ⅲ. MAX AMINO N16: Peptide-Driven, Synergistic Nutrient Enhancement

MAX AMINO N16 is a plant-derived amino acid product manufactured using advanced enzymatic hydrolysis technology. It is rich in functional small-molecule peptides and bioactive components. The peptide fractions work synergistically to promote nutrient transport and metabolic regulation, enhancing crop stress resistance and comprehensively improving nutrient utilization efficiency. The product leaves no chemical residues, offers excellent compatibility, and ensures high safety.

Product Specifications: Total amino acids: 85%; Organic nitrogen: 16%; pH value (1:100 dilution): 4.0–7.0; Form: light yellow powder

Compatibility:

Small-molecule amino acids for rapid nitrogen supplementation and chlorophyll promotion, effectively addressing leaf yellowing, thinning, and softness
Certified organic, suitable for organic farming with no residue risks
Dual application via root or foliar feeding, compatible throughout the entire growth cycle, combining quick and long-term effects
High compatibility, can be mixed with calcium/magnesium fertilizers, monopotassium phosphate, and other nutrients to enhance overall crop quality

Product Link: https://www.citymax-group.com/maxaminon16-product/

FAQs

Q: What are the raw materials used in this product? How small are the small-molecule peptides?

A: The product uses premium plant-based soybeans/soybean meal as raw material, purified through advanced targeted enzymatic hydrolysis. It is natural, safe, free of chemical residues, and highly suitable for organic farming. Regarding molecular weight, it is precisely controlled within the 500–1500 dalton range. Peptides within this specific size range exhibit exceptionally high biological activity, enabling them to directly penetrate plant cell membranes and be efficiently absorbed without requiring crops to expend energy on secondary hydrolysis, thereby maximizing nutrient assimilation efficiency.

Author Profile:

PING｜Senior Plant Physiology and Nutrition solutions Architect, CITYMAX GROUP

Focusing on interdisciplinary research and Technological translation at the intersection of plant Physiology and biostimulants,we are dedicated to Transforming fundamental scientific theories into Verifiable field solutions. By integrating cutting-edge Mechanisms with practical production applications, We drive the advancement of agricultural input R&D And deployment towards a new phase characterised By data-driven and mechanism-based approaches