Chitosan & Chitosan Oligosaccharide

Water-soluble chitosan oligosaccharide (COS) with DP2–10 content ≥ 80% — a natural plant biostimulant produced by enzymatic degradation, available in powder grades (85%–98%) and liquid formulations.

What is COS

A signal molecule from the sea

Huminrich is the export brand of an integrated manufacturer-and-trader of agricultural inputs, established in 2002. We operate our own production facility with in-house quality control, and export worldwide on FOB terms through Shanghai, Ningbo and Qingdao.

COS is recognized by receptor proteins on plant cell membranes and activates the plant’s innate immune system (PTI — Pattern-Triggered Immunity). It is used worldwide as an agricultural biostimulant, seed-treatment agent and fertilizer synergist.

Why COS

Four properties that matter in the field

Natural & Biodegradable

Sourced from marine crustacean shells.

High Bioactivity

DP2–10 oligomers ≥ 80%, the bioactive range for crop uptake; monosaccharide content < 0.5% (PG3/PG4).

Excellent Compatibility

Stable and applicable across pH 2–14; suitable for blending with most fertilizers and foliar programs.

Low Use Rate

Typical foliar rate 10–25 g/ha for powder.

How it works

Mode of action

Plant defense elicitor

Activates natural innate immunity (PTI), helping plants better withstand biotic stress.

Abiotic stress response

Supports crop performance under cold, heat and drought stress conditions.

Root & germination

Supports root development, germination potential and seedling establishment.

Fertilizer synergist

Improves nutrient use efficiency when blended into foliar, drip and compound fertilizers.

Soil & residue

Supports a beneficial soil microbial environment and induces plant P450 enzyme activity involved in the natural degradation of chemical residues.

Product Portfolio

Powder grades & liquid formulations

PG1 / PG2 (food & pharmaceutical grade) specifications and quotations are available on request.

Form	Grade	Assay	Positioning
Powder	Food grade	95%–98%	Food & nutraceutical applications (MW 300–1,500 Da)
	Pharmaceutical grade	95%–98%	MW < 1,000 Da, on request
	Agricultural grade (PG3 / PG4 / PG5)	85%–94%	Ag biostimulant & blending — see specification table
Liquid	LY1 – LY4	5%–18%	Liquid formulations for foliar / fertigation programs

Specification — Powder

Agricultural grades PG3 · PG4 · PG5

Item	PG3 (Premium Ag)	PG4 (Standard Ag)	PG5 (Economy Ag)
Appearance	Yellow-brown powder	Yellow-brown powder	Yellow-brown powder
Assay (content)	92%–94%	90%–92%	85%–90%
Molecular weight (Da)	1,000–3,000	1,000–3,000	1,000–3,000
DP2–10 content	≥ 80%	≥ 80%	≥ 80%
Monosaccharide content	< 0.5%	< 0.5%	—
Water solubility	98%–100%	97%–100%	97%–100%
Particle size	80–100 mesh	80–100 mesh	100 mesh
Moisture	≤ 10%	≤ 10%	≤ 10%
Ash	≤ 1%	≤ 1%	≤ 1%
pH (1% solution)	4–7	5–7	5–7
As / Pb / Hg (ppm)	< 10 each	< 10 each	< 10 each
Heavy metal (as Pb)	≤ 10 ppm	≤ 10 ppm	≤ 10 ppm

Specification — Liquid

Liquid grades LY1 – LY4

Item	LY1	LY2	LY3	LY4
Appearance	Brown liquid	Brown liquid	Brown liquid	Brown liquid
Assay (content)	15%–18%	12%–14%	8%–10%	5%–8%
Molecular weight (Da)	2,000–5,000	2,000–5,000	2,000–5,000	2,000–5,000
Ash	≤ 1%	≤ 1%	≤ 1%	≤ 1%
pH	4–7	4–7	4–7	4–7

Application Guide

Suggested use rates

Rates are for reference; adjust according to crop, growth stage and local agronomic practice.

Foliar application

Crop group	Powder (foliar)	Liquid (foliar)	Method
Rice / Wheat / Sorghum	10–20 g/ha	100–250 mL/ha	Foliar spray
Corn / Cotton / Peanut	15–20 g/ha	150–300 mL/ha	Foliar spray
Fruit trees	20–25 g/ha	225–500 mL/ha	Foliar spray
Vegetables	15–20 g/ha	150–300 mL/ha	Foliar spray

Blending application

Blending application	Recommended dosage
Seed coating	0.5%–3% of coating formulation
Foliar fertilizer blending	20–50 g per MT of fertilizer
Root flush / drip irrigation	30–100 g per MT
Compound fertilizer	20–60 g per MT
Macro-element NPK	2–10 g per MT

Packing & Shipping

Packed for export